1
|
Chan KT, Wu HY, Tin WY, But PPH, Cheung SCH, Shaw PC. Ethnopharmacology of five flowers herbal tea, a popular traditional beverage in Hong Kong and South China. J Ethnobiol Ethnomed 2024; 20:36. [PMID: 38491512 PMCID: PMC10943788 DOI: 10.1186/s13002-024-00674-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 03/06/2024] [Indexed: 03/18/2024]
Abstract
BACKGROUND It has been a long-standing tradition of using herbal tea for preventive and therapeutic healthcare in Hong Kong and South China and Five Flowers Tea is one of the most popular herbal teas. Based on the principle of traditional Chinese medicine, the pharmacological functions are to clear heat and dispel dampness in the body. Heat and dampness are thought to contribute to a range of health problems, especially during the hot and humid season in South China and Hong Kong. The most prevalent herbs in the formula contain bioactive compounds including flavonoids, alkaloids and terpenoids, which have a wide range of pharmacological properties including anti-inflammation, antivirus, antidiarrhoea, antibacteria, and antioxidation. However, with the composition varies widely, the ethnopharmacological benefits described may not be delivered uniformly. This study is to provide a comprehensive analysis on the composition of the Five Flowers Tea sold in Hong Kong and investigate the rationale behind the selection of herbs used in the formula. This study also provides information on the variation and quality of the Five Flowers Tea in the market. METHODS Thirty-three Five Flowers Tea samples were collected from various locations in Hong Kong. The size, texture, colour and organoleptic properties were documented. Macroscopic and molecular authentication methods were employed to identify the individual components. RESULTS Macroscopic identification revealed there were 23 herbs belonging to 18 plant families. The most prevalent herb was Bombax ceiba L., followed by Chrysanthemum morifolium. Ten adulterants and the existence of insect Lasioderma serricorne were confirmed by DNA barcoding techniques. CONCLUSION This study employed a comprehensive approach to authenticate the herbs in Five Flowers Tea samples collected from various locations in Hong Kong. Macroscopic and molecular methods were used to identify the herbs and adulterants. The findings revealed the varied composition in Five Flowers Tea and the occurrence of adulterants in some samples. This shows that quality assurance of Five Flowers Tea is essential for the effective use of this popular folk medicine.
Collapse
Affiliation(s)
- Kwun-Tin Chan
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Hoi-Yan Wu
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Wing-Yee Tin
- Institute of Future Cities, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | - Paul Pui-Hay But
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| | | | - Pang-Chui Shaw
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
| |
Collapse
|
2
|
Wu HY, Wong KL, Law STS, Nong W, Chan KT, Hui JHL, Lin G, Chan WH, Shaw PC. Determination of ITS1 haplotypes of Fritillariae Cirrhosae Bulbus by amplicon sequencing. Chin Med 2024; 19:33. [PMID: 38419104 PMCID: PMC10900738 DOI: 10.1186/s13020-024-00911-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 02/16/2024] [Indexed: 03/02/2024] Open
Abstract
BACKGROUND Fritillariae Cirrhosae Bulbus is an antitussive and expectorant Chinese medicinal material derived from the dried bulbs of six Fritillaria species. In the 2015 edition of the Chinese Pharmacopoeia, the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) is the officially listed method for their authenfication. Specifically, the ~ 300-bp ITS1 amplicon of only Fritillariae Cirrhosae Bulbus but not other Fritillaria species can be cleaved into two smaller fragments with restriction enzyme SmaI. Considering repeated reported cases of incomplete digestion of ITS1 amplicon, this study aims to investigate the possibility of heterogeneous ITS1 sequences contained in the Fritillariae Cirrhosae Bulbus. METHODS In this study, ITS1 amplicons of Fritillaria Cirrhosae Bulbus and four other Fritillaria species were sequenced on Illumina platform. We utilised high-throughout amplicon sequencing to determine ITS1 haplotypes and their frequencies in Fritillaria genomes. RESULTS Our results showed that all six botanical sources of Fritillariae Cirrhosae Bulbus indeed possess ITS1 haplotypes with no SmaI restriction site, and the average percentages of ITS1 reads containing SmaI restriction site ranged from 63.60% to 91.81%. CONCLUSION Our findings suggest that the incomplete digestion in PCR-RFLP analysis of Fritillariae Cirrhosae Bulbus is caused by the presence of ITS1 haplotypes without SmaI restriction site due to intragenomic heterogeneity.
Collapse
Affiliation(s)
- Hoi-Yan Wu
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Ka-Lok Wong
- Government Chinese Medicines Testing Institute, Chinese Medicine Regulatory Office, Department of Health, Shatin, N.T., Hong Kong, China
| | - Sean Tsz-Sum Law
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Wenyang Nong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Kwun-Tin Chan
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Jerome Ho-Lam Hui
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Ge Lin
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
- School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
| | - Wing-Han Chan
- Government Chinese Medicines Testing Institute, Chinese Medicine Regulatory Office, Department of Health, Shatin, N.T., Hong Kong, China
| | - Pang-Chui Shaw
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants (The Chinese University of Hong Kong) and Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China.
| |
Collapse
|
3
|
Wong SM, Chen EY, Suen YN, Ho W, Chan SK, Lee EH, Chan KT, Lui SS, Wong MT, Hui CL. Increased psychological distress among young people before and during the fifth wave of COVID-19 after two years of pandemic in Hong Kong: a 6-month longitudinal study. BMC Psychiatry 2023; 23:433. [PMID: 37322448 PMCID: PMC10267546 DOI: 10.1186/s12888-023-04933-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 06/07/2023] [Indexed: 06/17/2023] Open
Abstract
BACKGROUND Despite over two years of COVID-19 worldwide, the outbreak of the Omicron variant has given rise to an unprecedented surge of infection with diverse lockdown measures implemented globally. Whether the emergence of a new wave of COVID-19 could further affect mental health in the population after nearly two years of the pandemic remains to be addressed. Furthermore, whether changes in smartphone overuse behaviours and physical activity - both of which are particularly relevant to young people - would together contribute to changes in distress symptoms during this wave of COVID-19 was also examined. METHODS A total of 248 young people from an ongoing household-based epidemiological study in Hong Kong who completed their baseline assessments prior to the Omicron variant outbreak, i.e., fifth wave of COVID-19 (July-November 2021), were invited for a 6-month follow-up study during this wave of infection (January-April 2022) (mean age = 19.7 years, SD = 2.7; 58.9% females). At both time points, levels of global distress symptoms, perceived stress, smartphone overuse, frequency of engagement in vigorous physical activity, and other potential risk and protective factors were assessed. RESULTS The proportion of young people presenting moderate-to-severe distress (6-item Kessler Psychological Distress Scale ≥ 5) significantly increased from 45.6 to 54.4% during the fifth wave of COVID-19 (p < 0.010). Significantly increased levels of smartphone overuse and reduced days of vigorous physical activity were also observed during the fifth wave. Notably, increased smartphone overuse and reduced physical activity both additively and interactively contributed to elevated distress at 6 months, even after accounting for demographic characteristics, psychiatric history, childhood adversity, as well as baseline distress symptoms, resilience, and recent personal stressors. CONCLUSIONS The findings suggest that the emergence of a new wave of COVID-19, specifically the Omicron outbreak, can further aggravate mental distress even after a protracted period of the pandemic. Awareness of the dynamic nature of COVID-19 is necessitated to address the pressing mental health needs of populations. Supporting young people in healthier patterns of smartphone use and physical activity can be helpful.
Collapse
Affiliation(s)
- Stephanie My Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - Eric Yh Chen
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong.
- The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong.
| | - Y N Suen
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - Winky Ho
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - Sherry Kw Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
- The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Edwin Hm Lee
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - K T Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - Simon Sy Lui
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - Michael Th Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| | - Christy Lm Hui
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong
| |
Collapse
|
4
|
Wong SMY, Hui CLM, Cheung VKW, Suen YN, Chan SKW, Lee EHM, Chan KT, Wong MTH, Chen EYH. Prevalence of frequent nightmares and their prospective associations with 1-year psychiatric symptoms and disorders and functioning in young adults: a large-scale epidemiological study in Hong Kong. Sleep 2022; 46:6871073. [PMID: 36462212 DOI: 10.1093/sleep/zsac296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 11/27/2022] [Indexed: 12/04/2022] Open
Abstract
Abstract
Study Objectives
No study has yet examined the prevalence of frequent nightmares in representative youth populations in Asia and how they may contribute to future mental health risks. We aimed to fill this gap using data from a large-scale household-based youth sample in Hong Kong.
Methods
Participants were consecutively recruited from a large-scale epidemiological youth mental health study in Hong Kong (n=3,132). A subset of participants were invited for a follow-up assessment after 1 year (n=1,154 in the final analyses). Frequent nightmares (≥1/week during the past month) were assessed using an item from the Pittsburgh Sleep Quality Index. Univariate analyses and multivariable logistic regression models were applied to examine the contribution of frequent nightmares at baseline to moderate-to-severe depressive and anxiety symptoms, post-traumatic stress disorder symptoms, and 30-day major depressive episode (MDE) or generalised anxiety disorder (GAD), both at baseline and follow-up. The long-term functional implications of frequent nightmares were also examined.
Results
The prevalence of frequent nightmares was 16.3%. Females were more likely to experience frequent nightmares (20.4%) compared to males (12.1%), p<0.001. Baseline frequent nightmares were significantly associated with all four mental health outcomes at 1 year. Notably, their prospective associations with depressive and anxiety symptoms and 30-day MDE/GAD remained significant even after adjusting for external stressors, resilience, and sociodemographic characteristics. Frequent nightmares were also significantly associated with both current and 1-year functional impairments.
Conclusions
Frequent nightmares have significant long-term implications on mental health and functioning. Identifying young adults with frequent nightmares can improve early risk detection and intervention in the population.
Collapse
Affiliation(s)
- Stephanie M Y Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - Christy L M Hui
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - Vivian K W Cheung
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - Y N Suen
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - Sherry K W Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
- The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong , Hong Kong
| | - Edwin H M Lee
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - K T Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - Michael T H Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
| | - Eric Y H Chen
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong , Hong Kong
- The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong , Hong Kong
| |
Collapse
|
5
|
Wong SM, Chen EY, Wong CS, Suen YN, Chan DL, Tsang SH, Wong TY, Cheung C, Chan KT, Lui SS, Wong MT, Chan SK, Lee EH, Myin-Germeys I, Hui CL. Impact of smartphone overuse on 1-year severe depressive symptoms and momentary negative affect: Longitudinal and experience sampling findings from a representative epidemiological youth sample in Hong Kong. Psychiatry Res 2022; 318:114939. [PMID: 36343577 DOI: 10.1016/j.psychres.2022.114939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 10/21/2022] [Accepted: 10/30/2022] [Indexed: 11/06/2022]
Abstract
Smartphone overuse can have detrimental impacts on youth mental health. How it may be longitudinally associated with depressive symptoms and functioning, and with daily momentary affect, remains to be investigated. A total of 3,033 young people were consecutively recruited from a large-scale epidemiological youth mental health study in Hong Kong. A subsample (n = 936) was followed-up after 1 year, with experience sampling data collected from 177 participants. Separate multivariable logistic regression models were applied to examine the prospective associations between smartphone overuse and depressive symptoms, with multilevel models fitted to examine its associations with momentary affect. The prevalence of smartphone overuse in the Hong Kong youth population was 29.3%. Smartphone overuse was significantly associated with more depressive symptoms and functional impairments both cross-sectionally and longitudinally. The associations between smartphone overuse and 1-year depressive symptoms were significant, even when accounting for baseline symptoms, social media use, and other risk and protective factors. Baseline depressive symptoms, in contrast, were not associated with 1-year smartphone overuse after adjusting for baseline smartphone overuse. Smartphone overuse was also significantly associated with higher levels of momentary negative affect, even when accounting for depressive symptoms. Strategies to mitigate the impact of smartphone overuse can have important long-term implications.
Collapse
Affiliation(s)
- Stephanie My Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Eric Yh Chen
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong; The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong.
| | - Corine Sm Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Y N Suen
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Dorothy Lk Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Samantha Hs Tsang
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - T Y Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Charlton Cheung
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - K T Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Simon Sy Lui
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Michael Th Wong
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Sherry Kw Chan
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong; The State Key Laboratory of Brain and Cognitive Sciences, The University of Hong Kong, Hong Kong
| | - Edwin Hm Lee
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| | - Inez Myin-Germeys
- Department for Neurosciences, Center for Contextual Psychiatry, KU Leuven, Leuven, Belgium
| | - Christy Lm Hui
- Department of Psychiatry, School of Clinical Medicine, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
| |
Collapse
|
6
|
Chan AKC, Tsang CF, Chui SF, Wong ECY, Au SY, Ng GWY, Chan KT, Lee MKY. Managing acute myocardial infarction in patients with COVID-19 at a cardiac catheterisation laboratory. Hong Kong Med J 2021; 27:152-153. [PMID: 33824214 DOI: 10.12809/hkmj209046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- A K C Chan
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - C F Tsang
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - S F Chui
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - E C Y Wong
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - S Y Au
- Intensive Care Unit, Queen Elizabeth Hospital, Hong Kong
| | - G W Y Ng
- Intensive Care Unit, Queen Elizabeth Hospital, Hong Kong
| | - K T Chan
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| | - M K Y Lee
- Department of Medicine, Queen Elizabeth Hospital, Hong Kong
| |
Collapse
|
7
|
Wu HY, Chan KT, But GWC, Shaw PC. Assessing the reliability of medicinal Dendrobium sequences in GenBank for botanical species identification. Sci Rep 2021; 11:3439. [PMID: 33564041 PMCID: PMC7873228 DOI: 10.1038/s41598-021-82385-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 01/19/2021] [Indexed: 12/04/2022] Open
Abstract
DNA-based method is a promising tool in species identification and is widely used in various fields. DNA barcoding method has already been included in different pharmacopoeias for identification of medicinal materials or botanicals. Accuracy and validity of DNA-based methods rely on the accuracy and taxonomic reliability of the DNA sequences in the database to be compared against. Here we evaluated the annotation quality and taxonomic reliability of selected barcode loci (rbcL, matK, psbA-trnH, trnL-trnF and ITS) of 41 medicinal Dendrobium species downloaded from GenBank. Annotations of most accessions are incomplete. Only 53.06% of the 2041 accessions downloaded contain a reference to a voucher specimen. Only 31.60% and 4.8% of the entries are annotated with country of origin and collector or assessor, respectively. Taxonomic reliability of the sequences was evaluated by a Megablast search based on similarity to sequences submitted by other research groups. A small number of sequences (211, 7.14%) was regarded as highly doubted. Moreover, 10 out of 60 complete chloroplast genomes contain highly doubted sequences. Our findings suggest that sequences of GenBank should be used with caution for species-level identification. The scientific community should provide more important information regarding identity and traceability of the sample when they deposit sequences to public databases.
Collapse
Affiliation(s)
- Hoi-Yan Wu
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Kwun-Tin Chan
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Grace Wing-Chiu But
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Pang-Chui Shaw
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China.
- State Key Laboratory of Research on Bioactivities and Clinical Applications of Medicinal Plants (The Chinese University of Hong Kong) and Institute of Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China.
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
| |
Collapse
|
8
|
Ho C, Lee PH, So TC, Chiang MCS, Wong MH, Fong YH, Tsang CF, Cheng YW, Luk NH, Chui SF, Chan KC, Wong CY, Fu CL, Lee KY, Chan KT. 224 Malignancy associated pericardial effusion- do we need to drain them all? Eur Heart J 2020. [DOI: 10.1093/ehjci/ehz872.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
On Behalf
Cardiac Team, Department of Medicine, Queen Elizabeth Hospital
Background
Management of significant pericardial effusion in cancer patients is controversial. These patients have poor prognosis, and avoiding unnecessary intervention is important. Close monitoring of symptoms and echocardiogram is often a reasonable option, but inherits risk of cardiac tamponade. Whether pericardial drainage by means of percutaneous pericardiocentesis or surgical pericardiotomy could prevent future deterioration or affect survival is unknown.
Purpose
To evaluate the benefit of elective pericardial drainage in malignancy associated pericardial effusion without echocardiographic or clinical evidence of tamponade effect.
Methods
From 1st Jul 2014 to 31st Dec 2017, all patients with new onset malignancy-associated pericardial effusion with size more than 1cm were retrospectively analyzed. Patients with clinical or echocardiographic evidence of cardiac tamponade were excluded. We compared pericardial drainage versus monitoring for short-term (30-day), mid-term (90-day) and long term (1 year) survival without need for drainage.
Results
101 patients were retrospectively analyzed. 40 (39.6%) patients underwent drainage. Overall median survival free from drainage was 4 months. There were no significant difference in short-term (30-day), mid-term (90-day) and long term (1-year) survival free from drainage or mortality between treatment and monitoring group. Size of pericardial effusion did not predict mortality or future need of drainage. Chemotherapy was associated with improved 30-day mortality (RR 0.53 CI 0.32-0.87 p = 0.025) but not survival free from drainage or longer term mortality.
Conclusion
Close monitoring could be a feasible strategy in cancer patients with significant pericardial effusion without tamponade effect.
Baseline characteristics Factor Drainage (n = 40) monitoring (n = 61) p-value method of drainage pericardiocentesis alone 17 NA pericardiotomy alone 13 both 10 Male 19 (47.5%) 27 (44.3%) 0.749 mean size (cm) 1.93 2.77 <0.001 mean age 60.9 63.1 0.357 on chemotherapy 27 (67.5%) 38 (62.3%) 0.593
Abstract 224 Figure. Survival free from drainage
Collapse
Affiliation(s)
- C Ho
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - P H Lee
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - T C So
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | | | - M H Wong
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - Y H Fong
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - C F Tsang
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - Y W Cheng
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - N H Luk
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - S F Chui
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - K C Chan
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - C Y Wong
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - C L Fu
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - K Y Lee
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| | - K T Chan
- Queen Elizabeth Hospital, Hong Kong, Hong Kong
| |
Collapse
|
9
|
Li B, Xu WW, Han L, Chan KT, Tsao SW, Lee NPY, Law S, Xu LY, Li EM, Chan KW, Qin YR, Guan XY, He QY, Cheung ALM. MicroRNA-377 suppresses initiation and progression of esophageal cancer by inhibiting CD133 and VEGF. Oncogene 2017; 36:3986-4000. [PMID: 28288140 PMCID: PMC5511242 DOI: 10.1038/onc.2017.29] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 12/29/2016] [Accepted: 01/11/2017] [Indexed: 02/05/2023]
Abstract
Esophageal cancer is one of the most lethal cancers worldwide with poor survival and limited therapeutic options. The discovery of microRNAs created a new milestone in cancer research. miR-377 is located in chromosome region 14q32, which is frequently deleted in esophageal squamous cell carcinoma (ESCC), but the biological functions, clinical significance and therapeutic implication of miR-377 in ESCC are largely unknown. In this study, we found that miR-377 expression was significantly downregulated in tumor tissue and serum of patients with ESCC. Both tumor tissue and serum miR-377 expression levels were positively correlated with patient survival. Higher serum miR-377 expression was inversely associated with pathologic tumor stage, distant metastasis, residual tumor status and chemoradiotherapy resistance. The roles of miR-377 in suppressing tumor initiation and progression, and the underlying molecular mechanisms were investigated. Results of in vitro and in vivo experiments showed that miR-377 overexpression inhibited the initiation, growth and angiogenesis of ESCC tumors as well as metastatic colonization of ESCC cells, whereas silencing of miR-377 had opposite effects. Mechanistically, miR-377 regulated CD133 and VEGF by directly binding to their 3' untranslated region. Moreover, systemic delivery of formulated miR-377 mimic not only suppressed tumor growth in nude mice but also blocked tumor angiogenesis and metastasis of ESCC cells to the lungs without overt toxicity to mice. Collectively, our study established that miR-377 plays a functional and significant role in suppressing tumor initiation and progression, and may represent a promising non-invasive diagnostic and prognostic biomarker and therapeutic strategy for patients with ESCC.
Collapse
MESH Headings
- AC133 Antigen/genetics
- Adult
- Aged
- Aged, 80 and over
- Animals
- Carcinoma, Squamous Cell/diagnosis
- Carcinoma, Squamous Cell/genetics
- Carcinoma, Squamous Cell/mortality
- Carcinoma, Squamous Cell/pathology
- Case-Control Studies
- Cell Line, Tumor
- Cell Transformation, Neoplastic/genetics
- Disease Progression
- Down-Regulation/genetics
- Esophageal Neoplasms/diagnosis
- Esophageal Neoplasms/genetics
- Esophageal Neoplasms/mortality
- Esophageal Neoplasms/pathology
- Esophageal Squamous Cell Carcinoma
- Female
- Gene Expression Regulation, Neoplastic
- HEK293 Cells
- Humans
- Male
- Mice
- Mice, Inbred BALB C
- Mice, Inbred NOD
- Mice, Nude
- Mice, SCID
- MicroRNAs/physiology
- Middle Aged
- Vascular Endothelial Growth Factor A/genetics
Collapse
Affiliation(s)
- B Li
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China
- The University of Hong Kong-Shenzhen Institute of Research and Innovation (HKU-SIRI), Shenzhen, China
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
| | - W W Xu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China
- The University of Hong Kong-Shenzhen Institute of Research and Innovation (HKU-SIRI), Shenzhen, China
| | - L Han
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China
- The University of Hong Kong-Shenzhen Institute of Research and Innovation (HKU-SIRI), Shenzhen, China
| | - K T Chan
- Department of Surgery, The University of Hong Kong, Pokfulam, China
| | - S W Tsao
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
| | - N P Y Lee
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
- Department of Surgery, The University of Hong Kong, Pokfulam, China
| | - S Law
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
- Department of Surgery, The University of Hong Kong, Pokfulam, China
| | - L Y Xu
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Shantou University Medical College, Shantou, China
| | - E M Li
- The Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area, Shantou University Medical College, Shantou, China
| | - K W Chan
- The University of Hong Kong-Shenzhen Institute of Research and Innovation (HKU-SIRI), Shenzhen, China
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
- Department of Pathology, The University of Hong Kong, Pokfulam, China
| | - Y R Qin
- Department of Clinical Oncology, First Affiliated Hospital, Zhengzhou University, Zhengzhou, China
| | - X Y Guan
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
- Department of Clinical oncology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China
| | - Q Y He
- College of Life Science and Technology, Jinan University, 601 West Huangpu Blvd., Guangzhou, China
| | - A L M Cheung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China
- The University of Hong Kong-Shenzhen Institute of Research and Innovation (HKU-SIRI), Shenzhen, China
- Centre for Cancer Research, The University of Hong Kong, Pokfulam, China
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, 21 Sassoon Road, Pokfulam, Hong Kong, SAR, China. E-mail:
| |
Collapse
|
10
|
Lee MK, Chui SF, Chan AK, Chan JL, Wong EC, Chan KT, Cheung HL, Chiang CS. Transcatheter aortic valve implantation: initial experience in Hong Kong. Hong Kong Med J 2017; 23:349-55. [PMID: 28655865 DOI: 10.12809/hkmj166030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
INTRODUCTION Aortic stenosis is one of the most common valvular heart diseases in the ageing population. Patients with symptomatic severe aortic stenosis are at high risk of sudden death. Surgical aortic-valve replacement is the gold standard of treatment but many patients do not receive surgery because of advanced age or co-morbidities. Recently, transcatheter aortic valve implantation has been developed as an option for these patients. This study aimed to assess efficacy and safety of this procedure in the Hong Kong Chinese population. METHODS Data for baseline patient characteristics, procedure parameters, and clinical outcomes up to 1-year post-implantation in a regional hospital in Hong Kong were collected and analysed. RESULTS A total of 56 patients with severe aortic stenosis underwent the procedure from December 2010 to September 2015. Their mean (± standard deviation) age was 81.9 ± 4.8 years; 64.3% of them were male. Their mean logistic EuroSCORE was 22.6% ± 13.4%. After implantation, the mean aortic valve area improved from 0.70 cm2 ± 0.19 cm2 to 1.94 cm2 ± 0.37 cm2. Of the patients, 92% were improved by at least one New York Heart Association functional class. Stroke and major vascular complications occurred in one (1.8%) and five (8.9%) patients, respectively. A permanent pacemaker was implanted in seven (12.5%) patients. Both hospital and 30-day mortalities were 1.8%. The 1-year all-cause and cardiovascular mortality rates were 12.5% and 7.1%, respectively. CONCLUSIONS Transcatheter aortic valve implantation has been developed as an alternative treatment for patients with symptomatic severe aortic stenosis who are deemed inoperable or high risk for surgery. Our results are very promising and comparable with those of major clinical trials.
Collapse
Affiliation(s)
- M Ky Lee
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - S F Chui
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - A Kc Chan
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - J Lk Chan
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - E Cy Wong
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - K T Chan
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - H L Cheung
- Department of Cardiothoracic Surgery, Queen Elizabeth Hospital, Jordan, Hong Kong
| | - C S Chiang
- Department of Medicine, Queen Elizabeth Hospital, Jordan, Hong Kong
| |
Collapse
|
11
|
But WM, Chan A, Lee CY, Lam A, Lam YY, Loung PY, Ng KL, Wong MY, Chan KT, Tse WY, Shek CC. Etiologies of 46,XY disorders of sex development (DSD): a collaborative study in Hong Kong. Int J Pediatr Endocrinol 2013. [PMCID: PMC3850129 DOI: 10.1186/1687-9856-2013-s1-p185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
12
|
Hui CLM, Wong GHY, Tang JYM, Chang WC, Chan SKW, Lee EHM, Lam MML, Chiu CPY, Law CW, Chung DWS, Tso S, Pang EPF, Chan KT, Wong YC, Mo FYM, Chan KPM, Hung SF, Honer WG, Chen EYH. Predicting 1-year risk for relapse in patients who have discontinued or continued quetiapine after remission from first-episode psychosis. Schizophr Res 2013; 150:297-302. [PMID: 23993865 DOI: 10.1016/j.schres.2013.08.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 07/23/2013] [Accepted: 08/10/2013] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Relapse is common among patients with psychotic disorders. Identification of relapse predictors is important for decision regarding maintenance medication. Naturalistic studies often identify medication non-adherence as a dominant predictor. There are relatively few studies for predictors where adherence is already known. It is this situation i.e., discontinuation of medication that predictors will be most useful. We identify predictors for relapse in situations of (i) discontinuation and (ii) continuation of maintenance medication. METHOD Analysis of relapse predictors is based on a randomized controlled study (n=178) comparing relapse rates between patients who discontinued or continued medication for at least 1 year following first-episode psychosis. Demographic, clinical and neurocognitive variables were assessed at baseline as predictors of relapse within 1 year. RESULTS Risk of relapse was 79% in the discontinuation group and 41% in the maintenance group. Predictors in the discontinuation group were diagnosis of schizophrenia, poorer semantic fluency performance, and higher blink rate. Predictors in the continuation group were disinhibition soft signs and more general psychopathology symptoms. CONCLUSION Different predictors of relapse were identified for first episode psychosis patients who discontinued and continued maintenance medication. Neurocognitive dysfunctions are important predictors for both groups. While signs of frontal dysfunction and dopamine hyperactivity predict relapse in the discontinuation group, sign of cognitive disinhibition predicts relapse in the continuation group.
Collapse
Affiliation(s)
- Christy L M Hui
- Department of Psychiatry, University of Hong Kong, Hong Kong, China.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Taylor MB, Tan IT, Chan KT, Shen L, Shi L, Wang DY. A prospective study of bacterial flora in nasal cavity of patients with persistent allergic rhinitis. Rhinology 2012; 50:139-46. [PMID: 22616074 DOI: 10.4193/rhino10.140] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
It remains unanswered whether persistent allergic inflammation in nasal mucosa alters bacterial colonization and infection. The aim of this study was to investigate the bacterial flora in the nasal cavity of patients with persistent allergic rhinitis (PAR) and to correlate the bacteriological findings with presence of nasal symptoms, nasal eosinophil and neutrophil counts. A total of 255 subjects, aged between 6 - 74 years (mean 33.9 years) was randomly selected from a population-based rhinitis survey study in Singapore. All subjects went through a thorough medical history and nasal examinations. Serum specific IgE to a panel of common house dust mites, nasal cytological and microbiological examinations were performed. PAR was diagnosed in 107 patients and none of them had received previous regular therapy. There is a significant relationship between PAR and eosinophil grades, but not with neutrophil count. No statistically significant difference was found in quantitative and qualitative bacterial flora in nasal cavity between PAR patients and subjects with non-rhinitis or with non-allergic rhinitis. There is a significant inverse correlation between ongoing rhinorrhoea and quantitative bacterial load, and between signs of nasal mucosa (pale and edema) and the presence and type of bacterial pathogens. In conclusion, our study demonstrates that patients with untreated (or using PRN medicine) PAR do not result in a significant change in bacterial flora in their nasal cavity.
Collapse
Affiliation(s)
- M B Taylor
- Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | | | | | | | | | | |
Collapse
|
14
|
Chen EYH, Hui CLM, Lam MML, Chiu CPY, Law CW, Chung DWS, Tso S, Pang EPF, Chan KT, Wong YC, Mo FYM, Chan KPM, Yao TJ, Hung SF, Honer WG. Maintenance treatment with quetiapine versus discontinuation after one year of treatment in patients with remitted first episode psychosis: randomised controlled trial. BMJ 2010; 341:c4024. [PMID: 20724402 PMCID: PMC2924475 DOI: 10.1136/bmj.c4024] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVE To study rates of relapse in remitted patients with first episode psychosis who either continued or discontinued antipsychotic drugs after at least one year of maintenance treatment. DESIGN 12 month randomised, double blind, placebo controlled trial. SETTING Early psychosis outpatient clinics in Hong Kong. PARTICIPANTS 178 patients with first episode psychosis who had received at least one year of antipsychotic drug treatment between September 2003 and July 2006 and had no positive symptoms of psychosis. INTERVENTIONS Patients received either maintenance treatment with quetiapine (400 mg/day) or placebo and were followed up for the next 12 months or until a relapse occurred. MAIN OUTCOME MEASURE Relapse assessed monthly and defined as re-emergence of psychotic symptoms (delusions, conceptual disorganisation, hallucinations, suspiciousness, and unusual thought content) according to predefined thresholds. RESULTS 178 patients were randomised (89 to quetiapine and 89 to placebo). The Kaplan-Meier estimate of the risk of relapse at 12 months was 41% (95% confidence interval 29% to 53%) for the quetiapine group and 79% (68% to 90%) for the placebo group (P<0.001). Although quetiapine was generally well tolerated, the rate of discontinuation due to adverse or serious adverse events was greater in the quetiapine group (18%; 16/89) than in the placebo group (8%; 7/89) (relative risk 2.29, 95% confidence interval 0.99 to 5.28; chi(2)=3.20, df=1; P=0.07). CONCLUSION In a group of asymptomatic patients with first episode psychosis and at least one year of previous antipsychotic drug treatment, maintenance treatment with quetiapine compared with placebo resulted in a substantially lower rate of relapse during the following year. Trial registration Clinical trials NCT00334035.
Collapse
Affiliation(s)
- Eric Y H Chen
- Department of Psychiatry, University of Hong Kong, Hong Kong.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Sin FWY, Cheng SCS, Chan KT, Meng L, Yu J, Xie Y. Mouse studies of SARS coronavirus-specific immune responses to recombinant replication-defective adenovirus expressing SARS coronavirus N protein. Hong Kong Med J 2009; 15 Suppl 2:33-36. [PMID: 19258632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
1. A recombinant adenovirus encoding SARS coronavirus(SARS-CoV) nucleocapsid protein (rAd-N) was constructed. 2. The ability of the rAd-N to induce anti-SARS-CoV N antibody production and cellular immune responses was evaluated in an HLA-A2.1/Kb transgenic mouse model.
Collapse
Affiliation(s)
- F W Y Sin
- Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | | | | | | | | | | |
Collapse
|
16
|
Cheung YK, Cheng SCS, Sin FWY, Chan KT, Xie Y. Investigation of immunogenic T-cell epitopes in SARS virus nucleocapsid protein and their role in the prevention and treatment of SARS infection. Hong Kong Med J 2008; 14 Suppl 4:27-30. [PMID: 18708671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Abstract
1. A novel HLA-A2.1-specific SARS coronavirus (SARS-CoV) nucleocapsid (N) protein epitope (N220-N228 LALLLLDRL) able to activate cytotoxic T cells in vitro has been identified. 2. When used with a single-chain-trimer system, the SARS-CoV N protein epitope (N220-N228 LALLLLDRL) can stimulate a cytotoxic T-cell response against N-protein expressing cells in the HLA-A2.1K(b) transgenic mouse model.
Collapse
Affiliation(s)
- Y K Cheung
- Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | | | | | | | | |
Collapse
|
17
|
Li SSL, So YC, Wong CH, Yiu SF, Chan KT. Treatment of long, diffuse in-stent restenosis with sirolimus-eluting stents. J Invasive Cardiol 2004; 16:81-3. [PMID: 14760198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Treatment of long, diffuse in-stent restenosis remains a therapeutic challenge. We report the successful use of multiple sirolimus-eluting stents (three 33-mm long stents) in a long, diffuse in-stent restenotic lesion. No major adverse cardiovascular events, including acute/subacute/delayed stent thrombosis, were noted at ten months. Angiography at six months showed widely patent stents with 19% restenosis only at the worst segment.
Collapse
Affiliation(s)
- Steven Siu-Lung Li
- Division of Cardiology, Department of Medicine, Queen Elizabeth Hospital, Kowloon, Hong Kong.
| | | | | | | | | |
Collapse
|
18
|
Abstract
We report our early experience in using the PercuSurge GuardWire Plus system as a distal protection device in patients with acute coronary syndrome and acute myocardial infarction. Forty-three patients received percutaneous coronary intervention with the GuardWire Plus system. Thirteen had unstable angina, five had non-Q myocardial infarction and 25 had ST segment elevation myocardial infarction. Forty-one target lesions were in native coronary vessels and two were in saphenous vein grafts. Total occlusion occurred in 18 patients. The mean occlusion time by the distal protective balloon was 262.8 +/- 114.1 s. Preoperatively, TIMI 0 flow was present in 18, TIMI II flow in two and TIMI III flow in 23 patients. Post-operatively, TIMI II and TIMI III flow were established in two and 41 patients, respectively. All procedures were successful and the GuardWire Plus system was successfully deployed in all but two patients. There was no procedure-related major adverse clinical event. There was no major adverse clinical event at 30 days. There was no device-related complication. We believe that the GuardWire Plus system is safe and feasible in patients with acute coronary syndrome and acute myocardial infarction.
Collapse
Affiliation(s)
- Steven S L Li
- Division of Cardiology, Department of Medicine, Queen Elizabeth Hospital, Kowloon, Hong Kong.
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Chan KT, Cheng SC, Xie H, Xie Y. A humanized monoclonal antibody constructed from intronless expression vectors targets human hepatocellular carcinoma cells. Biochem Biophys Res Commun 2001; 284:157-67. [PMID: 11374885 DOI: 10.1006/bbrc.2001.4837] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An anti-human hepatocellular carcinoma (HCC) monoclonal antibody, hHP-1, was genetically humanized from a murine monoclonal antibody. In this study, a concept of positional template approach was applied to design the amino acid sequence of hHP-1's variable region, and synthetic DNA fragments for protein expression were produced through overlapping PCR from single strand oligonucleotides. Synthetic DNA fragments and human antibody constant region cDNA were used to construct two CMV promotor-based expression vectors for the antibody light and heavy chains, in which the variable region was connected directly to the constant region without an intron sequence. Completely assembled humanized antibody was successfully expressed in mammalian cells as IgG1 kappa molecules and purified using protein A affinity column. The immunogenicity of the hHP1 was estimated by the amino acid sequence and determined through a HAMA (human anti-murine antibody) serum reaction assay. Results indicated that the immunogenicity of hHP-1 was significantly reduced. In vitro binding activity assay showed that the hHP-1 had retained its binding function to a human HCC SMMC-7721 cell-line, without cross binding to other human normal tissues. Immunofluorescence staining showed that hHP-1 had a strong binding activity to SMMC cells. A competitive binding assay showed that the relative binding activity of hHP-1 was approximately 25% binding activity of the original murine antibody. Our results indicate that a humanized antibody could be produced using intronless vectors and expressed as a complete IgG1 kappa antibody. Hence we believe that hHP-1 could be a potential candidate for HCC treatment.
Collapse
MESH Headings
- Amino Acid Sequence
- Animals
- Antibodies, Monoclonal/isolation & purification
- Antibodies, Monoclonal/pharmacology
- Antibodies, Monoclonal/physiology
- Antibody Specificity/immunology
- Base Sequence
- Binding, Competitive/drug effects
- Binding, Competitive/immunology
- CHO Cells
- Carcinoma, Hepatocellular/immunology
- Carcinoma, Hepatocellular/metabolism
- Chromatography, Affinity
- Cricetinae
- Cytomegalovirus/genetics
- Dose-Response Relationship, Drug
- Enzyme-Linked Immunosorbent Assay
- Fluorescent Antibody Technique
- Genetic Vectors/genetics
- Genetic Vectors/metabolism
- Humans
- Immunoglobulin G/isolation & purification
- Immunoglobulin G/pharmacology
- Immunoglobulin G/physiology
- Immunoglobulin Heavy Chains/genetics
- Immunoglobulin kappa-Chains/genetics
- Introns/genetics
- Liver Neoplasms/immunology
- Liver Neoplasms/metabolism
- Mice
- Molecular Sequence Data
- Serologic Tests
- Tumor Cells, Cultured
Collapse
Affiliation(s)
- K T Chan
- Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | | | | | | |
Collapse
|
20
|
Chiou-Tan FY, Kemp K, Elfenbaum M, Chan KT, Song J. Lumbosacral plexopathy in gunshot wounds and motor vehicle accidents: comparison of electrophysiologic findings. Am J Phys Med Rehabil 2001; 80:280-285; quiz 286-8. [PMID: 11277135 DOI: 10.1097/00002060-200104000-00010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To characterize the differences between injuries to the lumbosacral (LS) plexus caused by gunshot wounds (GSW) and motor vehicle crashes (MVC) with regard to the location and extent of involvement. DESIGN A retrospective review of electrophysiologic data from an electromyography laboratory of a county hospital. Nineteen patients with GSW and ten patients with MVC diagnosed by electromyography with an LS plexopathy were included in the study. Injuries were categorized by the number of anatomic quadrants of the LS plexus: upper anterior, upper posterior, lower anterior, and lower posterior. Comparison of upper vs. lower portions and bilaterality of LS plexus involvement was also made. Statistical analyses were performed with two-tailed Fisher's exact and general association tests. RESULTS Lower portions of the plexus were involved more frequently in patients with MVC compared those observed in patients with GSW. Upper portions of the LS plexus were more involved compared with the lower portions in patients with GSW injuries. More sections of the plexus were involved in patients with MVC compared with those in patients with GSW. CONCLUSIONS Compared with patients with MVC, patients with GSW had a greater chance of involvement of the upper portion of the plexus. The reverse was true for the lower portion. Hopefully this information will aid the electromyographer and rehabilitation team in the diagnosis and treatment of traumatic plexopathies caused by different etiologies.
Collapse
Affiliation(s)
- F Y Chiou-Tan
- Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, Texas 77004, USA
| | | | | | | | | |
Collapse
|
21
|
Miao J, Panesar NS, Chan KT, Lai FM, Xia N, Wang Y, Johnson PJ, Chan JY. Differential expression of a stress-modulating gene, BRE, in the adrenal gland, in adrenal neoplasia, and in abnormal adrenal tissues. J Histochem Cytochem 2001; 49:491-500. [PMID: 11259452 DOI: 10.1177/002215540104900409] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Genes that modulate the action of hormones and cytokines play a critical role in stress response, survival, and in growth and differentiation of cells. Many of these biological response modifiers are responsible for various pathological conditions, including inflammation, infection, cachexia, aging, genetic disorders, and cancer. We have previously identified a new gene, BRE, that is responsive to DNA damage and retinoic acid. Using multiple-tissue dot-blotting and Northern blotting, BRE was recently found to be strongly expressed in adrenal cortex and medulla, in testis, and in pancreas, whereas low expression was found in the thyroid, thymus, small intestine and stomach. In situ hybridization and immunohistochemical staining indicated that BRE was strongly expressed in the zona glomerulosa of the adrenal cortex, which synthesizes and secretes the mineralocorticoid hormones. It is also highly expressed in the glial and neuronal cells of the brain and in the round spermatids, Sertoli cells, and Leydig cells of the testis, all of which are associated with steroid hormones and/or TNF synthesis. However, BRE expression was downregulated in human adrenal adenoma and pheochromocytoma, whereas its expression was enhanced in abnormal adrenal tissues of rats chronically treated with nitrate or nitrite. These data, taken together, indicate that the expression of BRE is apparently associated with steroids and/or TNF production and the regulation of endocrine functions. BRE may play an important role in the endocrine and immune system, such as the cytokine-endocrine interaction of the adrenal gland.
Collapse
Affiliation(s)
- J Miao
- Department of Clinical Oncology, Sir Y.K. Pao Centre for Cancer, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, China
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Abstract
OBJECTIVE To determine the patterns of pain referral from the sacroiliac joint. STUDY DESIGN Retrospective. PARTICIPANTS/METHODS Fifty consecutive patients who satisfied clinical criteria and demonstrated a positive diagnostic response to a fluoroscopically guided sacroiliac joint injection were included. Each patient's preinjection pain description was used to determine areas of pain referral, and 18 potential pain-referral zones were established. OUTCOME MEASURES Observed areas of pain referral. RESULTS Eighteen men (36.0%) and 32 women (64.0%) were included with a mean age of 42.5 years (range, 20 to 75 yrs) and a mean symptom duration of 18.2 months (range, 1 to 72 mo). Forty-seven patients (94.0%) described buttock pain, and 36 patients (72.0%) described lower lumbar pain. Groin pain was described in 7 patients (14.0%). Twenty-five patients (50.0%) described associated lower-extremity pain. Fourteen patients (28.0%) described leg pain distal to the knee, and 6 patients (14.0%) reported foot pain. Eighteen patterns of pain referral were observed. A statistically significant relationship was identified between pain location and age, with younger patients more likely to describe pain distal to the knee. CONCLUSIONS Pain referral from the sacroiliac joint does not appear to be limited to the lumbar region and buttock. The variable patterns of pain referral observed may arise for several reasons, including the joint's complex innervation, sclerotomal pain referral, irritation of adjacent structures, and varying locations of injury with the sacroiliac joint.
Collapse
Affiliation(s)
- C W Slipman
- Department of Rehabilitation Medicine, Hospital of the University of Pennsylvania, Philadelphia 19104, USA
| | | | | | | | | | | |
Collapse
|
23
|
Abstract
Telomerase activity seems to play a role in the development and pathogenesis of thyroid carcinoma. Its incidence of expression and its application as a tumor marker remain to be elucidated. Thyroid tissues obtained during thyroidectomy from 1996-1998 were rapidly frozen and stored at -80 degrees C until processed. Telomerase activity was determined using telomeric repeat amplification protocol (TRAP). Histology of the tissue examined (67 benign and 59 malignant) was reviewed. Telomerase activity was detected in 15 of 52 papillary carcinomas (29%); 1 of 1 thyroid lymphoma (100%); 1 of 2 anaplastic carcinomas (50%); and 2 of 16 lymphocytic thyroiditis specimens (13%). Telomerase activity was not detectable in 35 normal thyroid, 9 follicular adenoma, 7 nodular hyperplasia, 2 follicular carcinoma, and 2 medullary carcinoma. Lymphocytic thyroiditis was detected in 8 of 37 (22%) apparently normal thyroid tissues adjacent to papillary thyroid carcinoma and telomerase activity was present in 2 of these 8 specimens (25%). In conclusion, telomerase does not appear to be frequently activated in papillary thyroid carcinoma. The association of lymphocytic thyroiditis with papillary thyroid carcinoma may limit its clinical usefulness as a tumor marker.
Collapse
Affiliation(s)
- C Y Lo
- Department of Surgery, University of Hong Kong Medical Centre, Queen Mary Hospital, China.
| | | | | | | |
Collapse
|
24
|
Cheng HS, Wong WS, Chan KT, Wang XF, Wang ZD, Chan HC. Modulation of Ca2+-dependent anion secretion by protein kinase C in normal and cystic fibrosis pancreatic duct cells. Biochim Biophys Acta 1999; 1418:31-8. [PMID: 10209208 DOI: 10.1016/s0005-2736(99)00011-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The study investigated the role of protein kinase C (PKC) in the modulation of agonist-induced Ca2+-dependent anion secretion by pancreatic duct cells. The short-circuit current (ISC) technique was used to examine the effect of PKC activation and inhibition on subsequent ATP, angiotensin II and ionomycin-activated anion secretion by normal (CAPAN-1) and cystic fibrosis (CFPAC-1) pancreatic duct cells. The ISC responses induced by the Ca2+-mobilizing agents, which had been previously shown to be attributed to anion secretion, were enhanced in both CAPAN-1 and CFPAC-1 cells by PKC inhibitors, staurosporine, calphostin C or chelerythrine. On the contrary, a PKC activator, phorbol 12-myristate 13-acetate (PMA), was found to suppress the agonist-induced ISC in CFPAC-1 cells and the ionomycin-induced ISC in CAPAN-1 cells. An inactive form of PMA, 4alphad-phorbol 12, 13-didecanote (4alphaD), was found to exert insignificant effect on the agonist-induced ISC, indicating a specific effect of PMA. Our data suggest a role of PKC in modulating agonist-induced Ca2+-dependent anion secretion by pancreatic duct cells. Therapeutic strategy to augment Ca2+-activated anion secretion by cystic fibrosis pancreatic duct cells may be achieved by inhibition or down-regulation of PKC.
Collapse
Affiliation(s)
- H S Cheng
- Department of Physiology, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
| | | | | | | | | | | |
Collapse
|
25
|
Wong WO, Chan KT, Leung TP. Identification of antinodes and zero-surface-strain contours of flexural vibration with time-averaged speckle pattern shearing interferometry. Appl Opt 1997; 36:3776-3784. [PMID: 18253405 DOI: 10.1364/ao.36.003776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A new time-averaged frame subtraction technique is introduced for vibration analysis by digital speckle shearing interferometry. The technique permits the enhancement of fringes by subtracting two Bessel fringe patterns at different forcing levels. Compared with the phase-shift method, this method is more efficient and easier to implement for qualitative vibration measurement, providing a means for fast inspection of plate vibration behavior. It is also capable of tracing contours of zero strain and locating antinodes on vibrating plates.
Collapse
|
26
|
Shcherbakov AM, Nguyen TL, Chin KA, Chan KT, Rabinovich SA, Nguyen VD, Chan VF, Nguyen TL, Vu TT, Padelt H. [The clinical efficacy of and tolerance for lariam (mefloquine) in tropical malaria in the south of the Socialist Republic of Vietnam]. Med Parazitol (Mosk) 1990:57-9. [PMID: 2266908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The study was performed in the area of distribution of tropical malaria resistant to 4-aminoquinolines (Vietnam) on 30 patients receiving lariam (mefloquine). The results were compared to the standard therapy with quinine and fansidar. They indicate a high efficacy of and a good tolerance to the drug tested. The use of lariam leads to a more rapid (as compared to the standard treatment) elimination of parasitemia and complete eradication of the disease relapses. The findings make it possible to recommend lariam for the prevention and treatment of tropical malaria.
Collapse
|
27
|
Leung PC, Chan KT. Giant cell tumor of the distal end of the radius treated by the resection and free vascularized iliac crest graft. Clin Orthop Relat Res 1986:232-6. [PMID: 3514026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Juxtaarticular giant cell tumor involving the distal radius presents a special problem of reconstruction after tumor excision. A tailored block of vascularized iliac crest graft with its feeding artery (i.e., the deep circumflex iliac artery) joined to the ulnar artery was used as a replacement for the resected distal radius, thereby creating a new wrist joint. Excellent graft survivals were observed in all four cases. The wrists, when assessed 24-48 months after surgery, were found to have good ranges of movement, although with mild dorsal subluxation. These results compared well with other means of wrist reconstruction (i.e., the vascularized fibular graft). Although conventional means of arthrodesis give acceptable hand function, the absence of wrist motion is unacceptable to the young and active, who may prefer the method described in this article.
Collapse
|
28
|
Chan KT, Gaevyĭ MD. [Effect of strophanthin and celanide on the autoregulation of the cerebral blood flow]. Farmakol Toksikol 1983; 46:58-61. [PMID: 6861991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
It has been demonstrated in acute experiments on anesthetized cats that the control group animals manifested (before glycoside administration) a comparatively steady brain circulation accompanied by changes in the arterial pressure (AP) within 60-150 mm Hg. Intravenous injection of strophanthine (0.05 mg/kg) and celanide (0.1 mg/kg) improved autoregulatory reaction of the brain vessels during AP falling to lower levels as compared to control.
Collapse
|
29
|
Chan KT, Gaevyĭ MD. [Effect of strophanthin and celanide on brain blood supply and metabolism]. Biull Eksp Biol Med 1982; 94:66-8. [PMID: 7171801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
|
30
|
Gipple KJ, Chan KT, Elvin AT, Lalka D, Axelson JE. Species differences in the urinary excretion of the novel primary amine conjugate: tocainide carbamoyl O-beta-D-glucuronide. J Pharm Sci 1982; 71:1011-4. [PMID: 7131264 DOI: 10.1002/jps.2600710914] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The metabolism of the antiarrhythmic drug tocainide (I) has been shown previously to occur via a novel pathway involving the addition of carbon dioxide to the primary amine nitrogen of I followed by conjugation with glucuronic acid. The product of this reaction, tocainide carbamoyl O-beta-D-glucuronide (II), the principal metabolite of I in humans, has been found to cyclize under strongly basic conditions to form 3-(2,6-xylyl)-5-methylhydantoin (III). Thus, evidence for the existence of II can be obtained by two different procedures: conversion of II to III in the presence of strong base and by hydrolysis of II with beta-glucuronidase. The principal purpose of the present investigation was to identify suitable species for studies of the mechanism involved in the formation of II, as well as to find an animal model suitable for toxicological evaluation of tocainide and structurally related compounds. Eight animal species were examined to identify those capable of metabolizing I into II. The fraction of an intraperitoneal dose excreted in urine as II was estimated by measurement of tocainide released by beta-glucuronidase mediated hydrolysis of urine and by the quantitation of III formed after alkalinization of urine samples. Urinary recovery of unchanged drug ranged from 9.5% of the dose in the gerbil to 48.7% in the cat. The percent of the dose excreted in urine as acid hydrolyzable conjugates ranged from less than 1% in the gerbil to a mean of 13% in the rabbit. Guinea pigs, dogs, cats, rabbits, and pigtail monkeys excreted amounts of II ranging from 0.2 to 2.4% of the dose. Thus, none of the species appeared to be a suitable model for the study of the mechanism of formation of II because of the quantitative insignificance of this pathway.
Collapse
|
31
|
Gaevyĭ MD, Sankina ZV, Chan KT, Sankina TV. [Dynamics of the development of postischemic cerebrovascular phenomena during perfusion of the cerebral vessels with a stable blood volume]. Patol Fiziol Eksp Ter 1982:61-64. [PMID: 7133768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
|
32
|
Chan KM, Chan KT, Lee SY, Chow YN, Leung PC. Complications in treatment of trochanteric fractures using Ender's nails--a review of 120 patients. Ann Acad Med Singap 1982; 11:170-7. [PMID: 7137894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A prospective study of 120 Chinese patients with trochanteric fractures treated with the surgical method of Ender's Nailing was undertaken. The average age of the patients was 79 years (ranged from 57 to 105 years). The follow-up period ranged from 4 to 18 months, with an average of 8 1/2 months. The mortality rate was 6%. There was no incidence of non-union, delayed union or deep wound infection. Local complications included extrusion of the nails, perforation of the femoral head, supracondylar fracture of the femur, mild limb shortening and external rotational deformity. Hip and knee pain occurred in a small percentage of patients but these tended to improve with time. Weight bearing walking could be started in the first week after operation in most of the patients. The functional result at 6 months was good in 73% of the patients. This method had the advantage of a limited surgical approach, minimal blood loss and good functional result. Analysis of the causes of the local complications indicated that if operative precautions were taken, morbidity could be reduced.
Collapse
|
33
|
Ma GF, Cheng JC, Chan KT, Chan KM, Leung PC. Finger tip injuries--a prospective study on seven methods of treatment on 200 cases. Ann Acad Med Singap 1982; 11:207-13. [PMID: 6753711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
7 common methods of treatment were selected at random for 200 cases of finger tip injuries. The methods included split skin grafting, full-thickness skin grafting, volar V-Y advancement, Kutler's bilateral V-Y advancement, revision amputation, cross-finger flap and simple dressing. These cases were seen weekly until healing was completed and then at 3 and 6 months. A proper functional assessment was given to each case at the last visit. The results were analysed along the parameters of wound healing, appearance, scar condition, sensory return, finger joint movements, motor-power and sick-leave benefits. The best results were obtained from the volar V-Y advancement method. Results were most unfavourable when cross-finger flaps were used. This latter method, therefore, was condemned. Simple dressing gave excellent results if one disregarded the lengthy period of wound healing, a somewhat tender scar and possible beaking of the nails. The other methods gave satisfactory results but had no outstanding advantage.
Collapse
|
34
|
Chan KT, Gaevyĭ MD. [Effect of strophanthin and celanide on the tonus of the cerebral and peripheral vessels]. Farmakol Toksikol 1982; 45:36-9. [PMID: 7056380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Resistography was used in acute experiments on anesthetized cats to demonstrate that cardiac glycosides, particularly celanide, often cause phasic (constrictive-dilative) responses of the perfused vessels and general arterial pressure. The constrictive response of the perfused vessels did not depend on the concentration of calcium ions in the blood and was not prevented by preliminary administration of dihydroergotoxin. However, glycosides prolonged the vasoconstrictive effect of noradrenaline. The vasodilative response to glycosides was reversed by atropine. It is assumed that the constrictive response is myotropic, whereas the dilative one is cholinergic in nature.
Collapse
|
35
|
Chan KT, Gaevyĭ MD. [Effect of strophanthin and celanide on the dynamics of development of postischemic cerebrovascular phenomena]. Biull Eksp Biol Med 1981; 92:562-4. [PMID: 7317634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In acute experiments on anesthetized cats with artificial respiration and isolated autohemoperfusion of the cerebral vessels by the pump of stabilized capacity (heparin was injected intravenously), cerebral ischemia was evoked by the stopping of the perfusion pump for 15 minutes. In the postischemic period (after perfusion resumption), 2 phases of the perfusion pressure (PP) changes were noted: at the beginning the PP lowering followed by the long-term increase (above the basic level). It is assumed that the PP changes reflect the time course of the development of suggestive postischemic cerebrovascular phenomena: hyper- and hypoperfusion. Preliminary intravenous injection (40-90 min before ischemia) of strophanthine and celanide (0.05 and 0.1 mg/kg) enhanced and extended the first phase and hampered the development of the second phase PP changes. Administration of strophanthine 90-120 min after ischemia (during the PP increase phase) did not alter the cerebrovascular resistance to the blood flow. Under these conditions the response of the cerebral vessels to strophanthine decreased as compared to that in intact (non-ischemized) cats.
Collapse
|
36
|
Chan KT. The management of primary liver carcinoma. Ann R Coll Surg Engl 1967; 41:253-82. [PMID: 4227947 PMCID: PMC2312178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
|