1
|
Shahat M, Abdelbaqy OMA, AbdelHakam AM, Ali SH, Attalla K. Can cross-sectional imaging replace diagnostic venography in pelvic venous disorder (PeVD)? J Vasc Surg Venous Lymphat Disord 2024; 12:101724. [PMID: 38135217 DOI: 10.1016/j.jvsv.2023.101724] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/14/2023] [Accepted: 11/16/2023] [Indexed: 12/24/2023]
Abstract
OBJECTIVE The primary etiology of pelvic venous disorder is multifactorial and challengeable in vascular surgery as it mandates multidisciplinary team cooperation for its evaluation and management. METHODS All patients investigated for pelvic venous disorder in a high-volume, tertiary referral university hospital were identified and analyzed retrospectively during the period (March 2021 through September 2022). Demographic and medical data were scored. Agreement between the noninvasive modalities (computed tomographic venography [CTV] or magnetic resonance venography [MRV]) and diagnostic venography in detecting the refluxing pelvic veins was analyzed. Sensitivity, specificity, and diagnostic accuracy are also measured. No patients' treatments were reported in this study as the treatment is scheduled in other sessions in some cases and is out of the scope of this article. All patients had a diagnostic venogram regardless of the axial imaging modality. The main goal was to compare cross-sectional imaging with diagnostic venography. RESULTS The total number of patients was 120 with a mean age of 34.4 ± 7.1 years; 86.7% were multiparous. All patients presented chronic pelvic pain with vulvoperineal and/or atypical lower limb varicosities. Then patients were divided into two groups: those with CTV and those with MRV. Sensitivity, specificity, and diagnostic accuracy of CTV were 50%, 33%, and 47% for the detection of incompetent ovarian veins, 83%, 33%, and 53% for the detection of incompetent internal iliac veins, and 50%, 40%, and 47% for the detection of incompetent pelvic plexus veins, respectively, whereas time-resolved MRV achieved sensitivity, specificity, and diagnostic accuracy of 73%, 25%, and 60% for the detection of incompetent ovarian veins, 75%, 46%, and 53% for the detection of incompetent internal iliac veins, and 67%, 33% and 60% for detection of incompetent pelvic plexus veins, respectively. CONCLUSIONS The desire to avoid the drawbacks of diagnostic venography led to an increase in the use of noninvasive imaging modalities. Our results achieved acceptable sensitivity, specificity, and diagnostic accuracy outcomes for cross-sectional imaging with the superiority of MRV over CTV in diagnosing PCS.
Collapse
Affiliation(s)
- Mohammed Shahat
- Department of Vascular and Endovascular Surgery, Assiut University Hospitals, Assiut, Egypt.
| | - Omar M A Abdelbaqy
- Department of Vascular and Endovascular Surgery, Assiut University Hospitals, Assiut, Egypt
| | - Ahmed M AbdelHakam
- Department of Diagnostic and Interventional Radiology, Assiut University Hospitals, Assiut, Egypt
| | - Sahar H Ali
- Department of Vascular and Endovascular Surgery, Assiut University Hospitals, Assiut, Egypt
| | - Khaled Attalla
- Department of Vascular and Endovascular Surgery, Assiut University Hospitals, Assiut, Egypt
| |
Collapse
|
2
|
Elsaid N, Razek A, Batouty NM, Elmokadem AH, Tawfik AM, Saied A. Combined Conduit Score in Contrast-Enhanced Magnetic Resonance Venography in Patients with Idiopathic Intracranial Hypertension : Neuro-interventionalists' vs. Radiologists' Assessment. Clin Neuroradiol 2023; 33:695-700. [PMID: 36799990 PMCID: PMC10450004 DOI: 10.1007/s00062-023-01263-5] [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] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 01/11/2023] [Indexed: 02/18/2023]
Abstract
BACKGROUND Based on increased understanding of the idiopathic intracranial hypertension (IIH) pathophysiology, venous sinus stenting (VSS) has emerged as an effective treatment for patients with transverse sinus stenosis (TSS). The presence of a reliable TSS screening tool is warranted. The combined conduit score (CCS) is the most widely used score for evaluation of the cerebral sinovenous stenosis in contrast-enhanced magnetic resonance venography (CE-MRV). PURPOSE OF THE STUDY To evaluate the interobserver agreement between neuro-interventionalists and radiologists with respect to the CCS in evaluation of transverse sinus stenosis in patients with idiopathic intracranial hypertension using CE-MRV. METHODS A retrospective study was conducted on 26 consecutive patients diagnosed with IIH and underwent CE-MRV. The 2 neuro-interventionalists and 2 radiologists separately evaluated the cerebral venous sinuses using the CCS. RESULTS The mean CCS was significantly different between the neuro-interventionalists and radiologists (p < 0.001), higher for the radiologists. The inter-rater reliability was excellent (ICC = 0.954, 95% CI: 0.898-0.979) between the 2 neuro-interventionalists, good between the 2 radiologists (ICC = 0.805, 95% CI: 0.418-0.921), but was not acceptable between the neuro-interventionalists and the radiologists (ICC 0.47 95% CI:-2.2-0.782). CONCLUSION Despite the excellent agreement between the neuro-interventionists and the good agreement between the radiologists, there was no agreement between the neuro-interventionists and the radiologists. Our finding suggests that there is a gap between the 2 specialties but does not favor any of them. Factors related to the observers, the venous sinus system, the MRV or the CCS score may have resulted in this discrepancy. Automatic or semi-automatic feature extractions to produce quantifiable biomarkers for IIH are warranted. The clinical decisions should not depend only on strongly observer-dependent scores with training and/or experience-dependent influences.
Collapse
Affiliation(s)
- Nada Elsaid
- Department of Neurology, Faculty of Medicine, Mansoura University, Mansoura, Egypt.
| | - Ahmed Razek
- Department of Diagnostic and interventional Radiology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Nihal M Batouty
- Department of Diagnostic and interventional Radiology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Ali H Elmokadem
- Department of Diagnostic and interventional Radiology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Ahmed M Tawfik
- Department of Diagnostic and interventional Radiology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Ahmed Saied
- Department of Neurology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| |
Collapse
|
3
|
Ahmed S, Arora A, Kulanthaivelu K, Saini J, Menon D, Chakrabarti D. Utility of 3D T1-weighted turbo spin echo black blood sequence for the diagnosis of cerebral venous thrombosis. Emerg Radiol 2023; 30:443-451. [PMID: 37341879 DOI: 10.1007/s10140-023-02150-9] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/08/2023] [Indexed: 06/22/2023]
Abstract
PURPOSE Accurate assessment of dural sinus, deep and cortical venous thrombosis on MR imaging is challenging. The aim of this study is to evaluate the accuracy of 3D-T1 turbo spin echo (T1S), sequences in detecting venous thrombosis and comparing it with susceptibility-weighted imaging (SWI), magnetic resonance venography (MRV) and post contrast T1 magnetization-prepared rapid acquisition gradient echo (T1C). METHODS A blinded retrospective observational analysis of 71 consecutive patients evaluated for cerebral venous thrombosis (CVT) and 30 control patients was performed. Multimodality reference standard adopted included T1C, SWI with MRV. Sub-analyses in superficial, deep and cortical venous segments were performed in addition to correlation of signal intensity of thrombus with the clinical stage. RESULTS A total of 2222 segments in 101 complete MRI examinations were evaluated. Sensitivity/specificity/positive predictive value/negative predictive value/accuracy and precision of T1S for detection of cortical vein thrombosis was 0.994/1/1/0.967/0.995/1, 1/0.874/0.949/1/0.963/0.950 for detection of superficial venous sinus thrombosis and 1/1/1/1/1/1 for deep venous thrombosis. The AUC yield for T1S was 0.997 for cortical, 1 for deep and 0.988 for superficial venous segments. CONCLUSION T1S paralleled the accuracy of conventional sequences in the overall detection of CVT but showed superior accuracy in the detection of cortical venous thrombosis. It makes a fitting addition to the CVT MRI protocol in scenarios demanding negation of gadolinium administration.
Collapse
Affiliation(s)
- Sabha Ahmed
- Department of Neuroimaging and Interventional Radiology, NIMHANS, Hosur Road, Bengaluru, Karnataka, 560029, India
| | - Ankit Arora
- Department of Neuroimaging and Interventional Radiology, NIMHANS, Hosur Road, Bengaluru, Karnataka, 560029, India
| | - Karthik Kulanthaivelu
- Department of Neuroimaging and Interventional Radiology, NIMHANS, Hosur Road, Bengaluru, Karnataka, 560029, India
| | - Jitender Saini
- Department of Neuroimaging and Interventional Radiology, NIMHANS, Hosur Road, Bengaluru, Karnataka, 560029, India.
| | - Deepak Menon
- Department of Neurology, NIMHANS, Bengaluru, Karnataka, India
| | | |
Collapse
|
4
|
Carletti F, Vilela P, Jäger HR. Imaging Approach to Venous Sinus Thrombosis. Radiol Clin North Am 2023; 61:501-519. [PMID: 36931766 DOI: 10.1016/j.rcl.2023.01.011] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Cerebral venous thrombosis (CVT) is a rare cerebrovascular disease caused by an occlusion of the cerebral venous sinuses or cortical veins. It has a favorable prognosis if diagnosed and treated early. CVT can be difficult to diagnose on clinical grounds, and imaging plays a key role. We discuss clinical features and provide an overview of current neuroimaging methods and findings in CTV.
Collapse
Affiliation(s)
- Francesco Carletti
- Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK.
| | - Pedro Vilela
- Neuroradiology Department. Lisbon Western University Center (Centro Hospitalar Lisboa Ocidental -CHLO), Lisbon Portugal; Imaging Department, Hospital da Luz Lisbon, Portugal
| | - Hans Rolf Jäger
- Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK; Neuroradiological Academic Unit, Department of Brain Repair and Rehabilitation, UCL Queen Square Institute of Neurology, London WC1N 3BG, UK
| |
Collapse
|
5
|
Qin XW, Luo ZY, Pan WQ, He J, Li ZM, Yu Y, Liu C, Weng SP, He JG, Guo CJ. The Interaction of Mandarin Fish DDX41 with STING Evokes type I Interferon Responses Inhibiting Ranavirus Replication. Viruses 2022; 15:58. [PMID: 36680100 PMCID: PMC9862065 DOI: 10.3390/v15010058] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 12/29/2022] Open
Abstract
DDX41 is an intracellular DNA sensor that evokes type I interferon (IFN-I) production via the adaptor stimulator of interferon gene (STING), triggering innate immune responses against viral infection. However, the regulatory mechanism of the DDX41-STING pathway in teleost fish remains unclear. The mandarin fish (Siniperca chuatsi) is a cultured freshwater fish species that is popular in China because of its high market value. With the development of a high-density cultural mode in mandarin fish, viral diseases have increased and seriously restricted the development of aquaculture, such as ranavirus and rhabdovirus. Herein, the role of mandarin fish DDX41 (scDDX41) and its DEAD and HELIC domains in the antiviral innate immune response were investigated. The level of scDDX41 expression was up-regulated following treatment with poly(dA:dT) or Mandarin fish ranavirus (MRV), suggesting that scDDX41 might be involved in fish innate immunity. The overexpression of scDDX41 significantly increased the expression levels of IFN-I, ISGs, and pro-inflammatory cytokine genes. Co-immunoprecipitation and pull-down assays showed that the DEAD domain of scDDX41 recognized the IFN stimulatory DNA and interacted with STING to activate IFN-I signaling pathway. Interestingly, the HELIC domain of scDDX41 could directly interact with the N-terminal of STING to induce the expression levels of IFN-I and ISGs genes. Furthermore, the scDDX41 could enhance the scSTING-induced IFN-I immune response and significantly inhibit MRV replication. Our work would be beneficial to understand the roles of teleost fish DDX41 in the antiviral innate immune response.
Collapse
Affiliation(s)
- Xiao-Wei Qin
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
- Guangdong Province Key Laboratory for Aquatic Economic Animals, and Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Zhi-Yong Luo
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Wei-Qiang Pan
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Jian He
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Zhi-Min Li
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Yang Yu
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Chang Liu
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Shao-Ping Weng
- Guangdong Province Key Laboratory for Aquatic Economic Animals, and Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Jian-Guo He
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
- Guangdong Province Key Laboratory for Aquatic Economic Animals, and Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| | - Chang-Jun Guo
- State Key Laboratory for Biocontrol & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
- Guangdong Province Key Laboratory for Aquatic Economic Animals, and Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China
| |
Collapse
|
6
|
Saleem T, Lucas M, Raju S. Comparison of intravascular ultrasound and magnetic resonance venography in the diagnosis of chronic iliac venous disease. J Vasc Surg Venous Lymphat Disord 2022; 10:1066-1071.e2. [PMID: 35561972 DOI: 10.1016/j.jvsv.2022.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 02/16/2022] [Accepted: 04/11/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND The diagnosis of chronic iliofemoral venous obstruction (CIVO) can be made with several different modalities. Intravascular ultrasound (IVUS) is the gold standard in the diagnosis of CIVO. However, being invasive, it should not be the initial examination to screen patients with CIVO. The aim of this report is to compare the performance of magnetic resonance venography (MRV) to IVUS in the diagnosis of CIVO. METHODS From January, 2016 to December, 2020, records of all patients who underwent pre-operative MRV and then IVUS in the evaluation of CIVO were retrospectively analyzed. RESULTS 505 patients were evaluated by any modality for CIVO. 15% (78) of these patients were evaluated by MRV. Patients who had failed a trial of conservative therapy for at least 3 - 6 months and who had disabling and life-style limiting symptoms of CIVO were selected to undergo further evaluation with MRV at the treating physician's discretion. For inclusion in analysis, technically satisfactory IVUS and MRV data was mandatory. Data was available for 60 common iliac vein (CIV) segments and 61 external iliac vein (EIV) segments for comparative analysis after appropriate exclusions. The mean age of the patients was 56 ± 15 years. Male to female ratio was 1:2. The distribution of patients across different CEAP classes was as follows: CEAP 3: 28%, CEAP 4: 62%, CEAP 5: 2% and CEAP 6: 8%. Bland-Altman plots of mean difference in area between IVUS and MRI were 74.1% for CIV and 56.9% for EIV. The sensitivity of MRV was 93% and 100% while the specificity was 0 and 50% for CIV and EIV respectively. The positive predictive value was 93% and 86% while the negative predictive value was 0 and 50% for CIV and EIV respectively. Improvement was noted in clinical parameters (Venous Clinical Severity score; VCSS, visual analogue pain scale and grade of swelling) after IVUS and stenting following MRV investigation. For VCSS, the score improved from 6 ± 2.7 (pre-procedure) to 4 ± 2.7 (post-procedure), p=0.0001. CONCLUSION There is dimensional disparity between MRV and IVUS in the diagnosis of symptomatic CIVO. MRV has a high sensitivity but low specificity when compared to IVUS and overestimates the severity of the stenosis in both the EIV and CIV. MRV is not a reliable diagnostic tool for iliac vein stenosis and should not be used for the definitive disposition of CIVO patients.
Collapse
Affiliation(s)
- Taimur Saleem
- The RANE Center for Venous and Lymphatic Diseases, Jackson, MS 39216.
| | - Michael Lucas
- The RANE Center for Venous and Lymphatic Diseases, Jackson, MS 39216
| | - Seshadri Raju
- The RANE Center for Venous and Lymphatic Diseases, Jackson, MS 39216
| |
Collapse
|
7
|
Shen S, Shan C, Lan Y, Chen Y, Li J, Guo X, Ji H, Li M, Cong M. Combined high-resolution 3D CUBE T1-weighted imaging and non-contrast-enhanced magnetic resonance venography for evaluation of vein stenosis in May-Thurner syndrome. Phlebology 2021; 37:14-20. [PMID: 34496697 DOI: 10.1177/02683555211045189] [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] [Indexed: 11/17/2022]
Abstract
PURPOSE To explore the feasibility of high-resolution MRI 3-dimensional (3D) CUBE T1-weighted magnetic resonance imaging (MRI) in combination with non-contrast-enhanced (NCE) magnetic resonance venography (MRV) for the assessment of lumen stenosis in May-Thurner syndrome. METHODS Twenty-nine patients underwent computed tomography venography (CTV) and high-resolution MRI-CUBE T1, and NCE MRV acquisitions. ANOVA and LSD tests were used to compare the stenosis rate and narrowest and distal diameters of the vessel lumen. RESULTS There were no significant differences in the estimated stenosis rate between CTV, CUBE T1, and NCE MRV (p = 0.768). However, there were significant differences in the measured stenosis diameters of the left common iliac vein (LCIV), with CTV giving the largest mean diameter and CUBE had the smallest mean diameter (p < 0.05). The measured normal LCIV diameters did not significantly differ between MRV and CUBE (p = 0.075) but were significantly larger on CTV than on MRV and CUBE (p < 0.05). CONCLUSIONS Compared with CTV, a combination of CUBE and MRV could provide an improved assessment of the degree of lumen stenosis in May-Thurner syndrome and demonstrate acute thrombosis. MRI underestimates the diameter of the vessel in comparison with CTV. MRI can be a substitute tool for Duplex ultrasound and CTV.
Collapse
Affiliation(s)
- Shanshan Shen
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Chunhui Shan
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Yanqin Lan
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Yingmin Chen
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Jikuan Li
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Xiaowan Guo
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Hong Ji
- Department of Radiology, Hebei General Hospital, Shijiazhuang, Hebei, ChinaHebei General Hospital, Shijiazhuang, Hebei, China
| | - Min Li
- GE Healthcare, MR Research China, Beijing, China
| | - MengDi Cong
- Department of Radiology, Hebei Children's Hospital, Shijiazhuang, Hebei, China
| |
Collapse
|
8
|
Smith P, Soussana J, Angers D, Schipper L, Chenu C, Rasse DP, Batjes NH, van Egmond F, McNeill S, Kuhnert M, Arias‐Navarro C, Olesen JE, Chirinda N, Fornara D, Wollenberg E, Álvaro‐Fuentes J, Sanz‐Cobena A, Klumpp K. How to measure, report and verify soil carbon change to realize the potential of soil carbon sequestration for atmospheric greenhouse gas removal. Glob Chang Biol 2020; 26:219-241. [PMID: 31469216 PMCID: PMC6973036 DOI: 10.1111/gcb.14815] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Accepted: 08/22/2019] [Indexed: 05/19/2023]
Abstract
There is growing international interest in better managing soils to increase soil organic carbon (SOC) content to contribute to climate change mitigation, to enhance resilience to climate change and to underpin food security, through initiatives such as international '4p1000' initiative and the FAO's Global assessment of SOC sequestration potential (GSOCseq) programme. Since SOC content of soils cannot be easily measured, a key barrier to implementing programmes to increase SOC at large scale, is the need for credible and reliable measurement/monitoring, reporting and verification (MRV) platforms, both for national reporting and for emissions trading. Without such platforms, investments could be considered risky. In this paper, we review methods and challenges of measuring SOC change directly in soils, before examining some recent novel developments that show promise for quantifying SOC. We describe how repeat soil surveys are used to estimate changes in SOC over time, and how long-term experiments and space-for-time substitution sites can serve as sources of knowledge and can be used to test models, and as potential benchmark sites in global frameworks to estimate SOC change. We briefly consider models that can be used to simulate and project change in SOC and examine the MRV platforms for SOC change already in use in various countries/regions. In the final section, we bring together the various components described in this review, to describe a new vision for a global framework for MRV of SOC change, to support national and international initiatives seeking to effect change in the way we manage our soils.
Collapse
Affiliation(s)
- Pete Smith
- Institute of Biological & Environmental SciencesUniversity of AberdeenAberdeenUK
| | | | | | - Louis Schipper
- Environmental Research InstituteUniversity of WaikatoHamiltonNew Zealand
| | | | | | | | | | | | - Matthias Kuhnert
- Institute of Biological & Environmental SciencesUniversity of AberdeenAberdeenUK
| | | | | | | | | | - Eva Wollenberg
- CGIAR CCAFS ProgrammeUniversity of Vermont (UVM)BurlingtonVTUSA
| | | | - Alberto Sanz‐Cobena
- Research Center for the Management of Environmental and Agricultural Risks (CEIGRAM)Universidad Politécnica de MadridMadridSpain
| | | |
Collapse
|
9
|
Tsutsumi S, Ono H, Yasumoto Y, Ishii H. Does the prone sleeping position affect the intracranial dural venous flow? Childs Nerv Syst 2019; 35:913-6. [PMID: 30929069 DOI: 10.1007/s00381-019-04139-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 03/21/2019] [Indexed: 10/27/2022]
Abstract
PURPOSE There are few studies documenting the effect of posture on intracranial dural venous flow. The aim of the present study was to explore alterations caused by the prone position using magnetic resonance (MR) venography. METHODS A total of eight patients (five men and three women) underwent non-contrast MR venography in both supine and prone positions. RESULTS In the prone position, an increase in intracranial dural venous flow was found in all patients in the non-dominant transverse and sigmoid sinuses. An increase in venous flow to the straight sinus was observed in 75% of the patients. Flow to the superior ophthalmic vein decreased in three patients. No postural flow alterations were observed in any of the patients in the superior sagittal, dominant transverse, and sigmoid sinuses. CONCLUSION Based on results of the study, in the prone sleeping position, part of the intracranial venous flow may be preferentially drained through the straight and non-dominant transverse sinuses.
Collapse
|
10
|
Silickas J, Black SA, Phinikaridou A, Gwozdz AM, Smith A, Saha P. Use of Computed Tomography and Magnetic Resonance Imaging in Central Venous Disease. Methodist Debakey Cardiovasc J 2018; 14:188-195. [PMID: 30410648 DOI: 10.14797/mdcj-14-3-188] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 01/01/2023] Open
Abstract
Successful management of acute deep vein thrombosis and post-thrombotic syndrome depends on careful patient selection and detailed investigation of thrombus extent, composition, and anatomy. This article reviews the use of computerized tomography and magnetic resonance imaging in the assessment of central deep veins of the pelvis and addresses new developments within the field. Despite drawbacks of each imaging modality, when contemplating deep venous reconstruction, cross-sectional imaging should be considered for preoperative planning and to compliment intraoperative imaging tools, including intravascular ultrasound and contrast venography.
Collapse
Affiliation(s)
- Justinas Silickas
- SCHOOL OF CARDIOVASCULAR MEDICINE AND SCIENCES, KING'S COLLEGE LONDON, LONDON, UK
| | - Stephen A Black
- SCHOOL OF CARDIOVASCULAR MEDICINE AND SCIENCES, KING'S COLLEGE LONDON, LONDON, UK.,GUY'S AND ST THOMAS' NHS FOUNDATION TRUST, ST THOMAS' HOSPITAL, LONDON, UK
| | | | - Adam M Gwozdz
- SCHOOL OF CARDIOVASCULAR MEDICINE AND SCIENCES, KING'S COLLEGE LONDON, LONDON, UK
| | - Alberto Smith
- SCHOOL OF CARDIOVASCULAR MEDICINE AND SCIENCES, KING'S COLLEGE LONDON, LONDON, UK
| | - Prakash Saha
- SCHOOL OF CARDIOVASCULAR MEDICINE AND SCIENCES, KING'S COLLEGE LONDON, LONDON, UK
| |
Collapse
|
11
|
Arora RD, Dass J, Maydeo S, Arya V, Kotwal J, Bhargava M. Utility of mean sphered cell volume and mean reticulocyte volume for the diagnosis of hereditary spherocytosis. ACTA ACUST UNITED AC 2018; 23:413-416. [PMID: 29338606 DOI: 10.1080/10245332.2018.1423879] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 10/18/2022]
Abstract
INTRODUCTION Hereditary spherocytosis (HS) is the most common congenital hemolytic anemia, characterized by anemia, jaundice, and splenomegaly. The diagnosis of HS relies on symptoms of hemolysis, a family history of HS, and a positive laboratory test which is usually the osmotic fragility test (OFT). We conducted a study to assess the utility of mean corpuscular hemoglobin concentration (MCHC), mean corpuscular volume (MCV), mean sphered cell volume (MSCV), and mean reticulocyte volume (MRV) in the diagnosis of HS and if these are helpful in distinguishing cases of HS from immune hemolytic anemia. METHODS A total of 102 patients suspected to have HS were enrolled. In addition 10 cases of immune hemolytic anemia (IHA) were included in the study and performance of the above screening tests was evaluated. The diagnosis of HS was based on incubated OFT, eosin 5'-maleimide (EMA) dye binding test, and flowcytometric OFT. RESULTS A total of 29 patients were diagnosed as having HS. The sensitivity and specificity for diagnosis HS by MCHC > 35 g/dL was 44.82%, and ΔMCV-MSCV > 10 fL has a sensitivity and specificity of 82.75% and 95.9% for diagnosis of HS. Using an algorithm of ΔMCV-MSCV > 10 fL and ΔMRV-MSCV < 25, for the differentiation of HS from IHA had sensitivity of 68.9% and specificity of 98.8%.
Collapse
Affiliation(s)
| | - Jasmita Dass
- a Department of Hematology , Sir Ganga Ram Hospital , New Delhi , India
| | - Seema Maydeo
- a Department of Hematology , Sir Ganga Ram Hospital , New Delhi , India
| | - Vandana Arya
- a Department of Hematology , Sir Ganga Ram Hospital , New Delhi , India
| | - Jyoti Kotwal
- a Department of Hematology , Sir Ganga Ram Hospital , New Delhi , India
| | - Manorama Bhargava
- a Department of Hematology , Sir Ganga Ram Hospital , New Delhi , India
| |
Collapse
|
12
|
Collins JD. Unsuspected Herniated Lung Obstructing the Right Internal Jugular Vein and Internal Carotid Artery in a Patient with Thoracic Outlet Syndrome: MRI/MRA and MRV. J Natl Med Assoc 2016; 108:106-12. [PMID: 27372470 DOI: 10.1016/j.jnma.2016.03.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
13
|
Piazza G, Mani V, Goldhaber SZ, Grosso MA, Mercuri M, Lanz HJ, Schussler S, Hsu C, Chinigo A, Ritchie B, Nadar V, Cannon K, Pullman J, Concha M, Schul M, Fayad ZA. Magnetic resonance venography to assess thrombus resolution with edoxaban monotherapy versus parenteral anticoagulation/warfarin for symptomatic deep vein thrombosis: A multicenter feasibility study. Vasc Med 2016; 21:361-8. [PMID: 27165711 PMCID: PMC4963800 DOI: 10.1177/1358863x16645853] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The feasibility of magnetic resonance venography (MRV) for measuring change in thrombus volume with a novel anticoagulation regimen versus standard anticoagulation in patients with symptomatic deep vein thrombosis (DVT) has not been assessed. Our aim was to study the feasibility of MRV to measure change in thrombus volume in patients with acute symptomatic objectively confirmed proximal DVT in an open-label multicenter trial (edoxaban Thrombus Reduction Imaging Study, eTRIS). We randomized patients in a 2:1 allocation ratio to edoxaban 90 mg/day for 10 days followed by 60 mg/day versus parenteral anticoagulation bridging to warfarin for 3 months. The primary efficacy outcome was a surrogate end point of the relative change in MRV-quantified thrombus volume from baseline to Day 14–21. A total of 85 eligible patients from 26 study sites were randomized to edoxaban monotherapy (n=56) versus parenteral anticoagulation as a ‘bridge’ to warfarin (n=29). The mean relative change in MRV-quantified thrombus volume from baseline to Day 14–21 was similar in patients treated with edoxaban and parenteral anticoagulation as a ‘bridge’ to warfarin (−50.1% vs −58.9%; 95% confidence interval of treatment difference, −12.7%, 30.2%). However, thrombus extension was observed in eight patients in the edoxaban monotherapy group and in none in the warfarin group. Rates of recurrent venous thromboembolism (3.6% vs 3.6%, p=0.45) and clinically relevant non-major bleeding (5.4% vs 7.1%, p=0.34) were also similar. No major bleeds occurred in either on-treatment group during the study period. In conclusion, MRV can assess change in thrombus volume in patients with acute DVT randomized to two different anticoagulant regimens. ClinicalTrials.govIdentifier: NCT01662908 Investigational New Drug (IND) Application: Edoxaban IND # 63266
Collapse
Affiliation(s)
- Gregory Piazza
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Venkatesh Mani
- Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Samuel Z Goldhaber
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | | | | | - Hans J Lanz
- Daiichi Sankyo Pharma Development, Edison, NJ, USA
| | | | - Ching Hsu
- Daiichi Sankyo Pharma Development, Edison, NJ, USA
| | - Amy Chinigo
- Daiichi Sankyo Pharma Development, Edison, NJ, USA
| | - Bruce Ritchie
- Division of Hematology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | | | | | | | | | - Marlin Schul
- Lafayette Regional Vein and Laser Center, Lafayette, IN, USA
| | - Zahi A Fayad
- Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | |
Collapse
|
14
|
Lagomasino D, Fatoyinbo T, Lee S, Feliciano E, Trettin C, Simard M. A Comparison of Mangrove Canopy Height Using Multiple Independent Measurements from Land, Air, and Space. Remote Sens (Basel) 2016; 8:327. [PMID: 29629207 PMCID: PMC5884677 DOI: 10.3390/rs8040327] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Canopy height is one of the strongest predictors of biomass and carbon in forested ecosystems. Additionally, mangrove ecosystems represent one of the most concentrated carbon reservoirs that are rapidly degrading as a result of deforestation, development, and hydrologic manipulation. Therefore, the accuracy of Canopy Height Models (CHM) over mangrove forest can provide crucial information for monitoring and verification protocols. We compared four CHMs derived from independent remotely sensed imagery and identified potential errors and bias between measurement types. CHMs were derived from three spaceborne datasets; Very-High Resolution (VHR) stereophotogrammetry, TerraSAR-X add-on for Digital Elevation Measurement, and Shuttle Radar Topography Mission (TanDEM-X), and lidar data which was acquired from an airborne platform. Each dataset exhibited different error characteristics that were related to spatial resolution, sensitivities of the sensors, and reference frames. Canopies over 10 m were accurately predicted by all CHMs while the distributions of canopy height were best predicted by the VHR CHM. Depending on the guidelines and strategies needed for monitoring and verification activities, coarse resolution CHMs could be used to track canopy height at regional and global scales with finer resolution imagery used to validate and monitor critical areas undergoing rapid changes.
Collapse
Affiliation(s)
- David Lagomasino
- Universities Space Research Association/GESTAR, 7178 Columbia Gateway Dr., Columbia, MD 21046, USA
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
- Correspondence: ; Tel.: +1-301-614-6666
| | | | - SeungKuk Lee
- NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
| | | | - Carl Trettin
- US Department of Agriculture, Forest Service, Cordesville, SC 29434, USA
| | - Marc Simard
- Jet Propulsion Laboratory, Pasadena, CA 91109, USA
| |
Collapse
|
15
|
Mascorro VS, Coops NC, Kurz WA, Olguín M. Choice of satellite imagery and attribution of changes to disturbance type strongly affects forest carbon balance estimates. Carbon Balance Manag 2015; 10:30. [PMID: 26705411 PMCID: PMC4679100 DOI: 10.1186/s13021-015-0041-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 11/29/2015] [Indexed: 05/22/2023]
Abstract
BACKGROUND Remote sensing products can provide regular and consistent observations of the Earth´s surface to monitor and understand the condition and change of forest ecosystems and to inform estimates of terrestrial carbon dynamics. Yet, challenges remain to select the appropriate satellite data source for ecosystem carbon monitoring. In this study we examine the impacts of three attributes of four remote sensing products derived from Landsat, Landsat-SPOT, and MODIS satellite imagery on estimates of greenhouse gas emissions and removals: (1) the spatial resolution (30 vs. 250 m), (2) the temporal resolution (annual vs. multi-year observations), and (3) the attribution of forest cover changes to disturbance types using supplementary data. RESULTS With a spatially-explicit version of the Carbon Budget Model of the Canadian Forest Sector (CBM-CFS3), we produced annual estimates of carbon fluxes from 2002 to 2010 over a 3.2 million ha forested region in the Yucatan Peninsula, Mexico. The cumulative carbon balance for the 9-year period differed by 30.7 million MgC (112.5 million Mg CO2e) among the four remote sensing products used. The cumulative difference between scenarios with and without attribution of disturbance types was over 5 million Mg C for a single Landsat scene. CONCLUSIONS Uncertainty arising from activity data (rates of land-cover changes) can be reduced by, in order of priority, increasing spatial resolution from 250 to 30 m, obtaining annual observations of forest disturbances, and by attributing land-cover changes by disturbance type. Even missing a single year in the land-cover observations can lead to substantial errors in ecosystems with rapid forest regrowth, such as the Yucatan Peninsula.
Collapse
Affiliation(s)
- Vanessa S. Mascorro
- Faculty of Forestry, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4 Canada
| | - Nicholas C. Coops
- Faculty of Forestry, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4 Canada
| | - Werner A. Kurz
- Canadian Forest Service, Natural Resources Canada, 506 West Burnside Road, Victoria, BC V8Z 1M5 Canada
| | - Marcela Olguín
- Proyecto Mexico-Noruega, Comision Nacional Forestal, Coyoacán, D.F. Col. del Carmen Coyoacán, CP 04100 Mexico, Mexico
| |
Collapse
|
16
|
Theilade I, Rutishauser E, Poulsen MK. Community assessment of tropical tree biomass: challenges and opportunities for REDD. Carbon Balance Manag 2015; 10:17. [PMID: 26229548 PMCID: PMC4515755 DOI: 10.1186/s13021-015-0028-3] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 07/14/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND REDD+ programs rely on accurate forest carbon monitoring. Several REDD+ projects have recently shown that local communities can monitor above ground biomass as well as external professionals, but at lower costs. However, the precision and accuracy of carbon monitoring conducted by local communities have rarely been assessed in the tropics. The aim of this study was to investigate different sources of error in tree biomass measurements conducted by community monitors and determine the effect on biomass estimates. Furthermore, we explored the potential of local ecological knowledge to assess wood density and botanical identification of trees. RESULTS Community monitors were able to measure tree DBH accurately, but some large errors were found in girth measurements of large and odd-shaped trees. Monitors with experience from the logging industry performed better than monitors without previous experience. Indeed, only experienced monitors were able to discriminate trees with low wood densities. Local ecological knowledge did not allow consistent tree identification across monitors. CONCLUSION Future REDD+ programmes may benefit from the systematic training of local monitors in tree DBH measurement, with special attention given to large and odd-shaped trees. A better understanding of traditional classification systems and concepts is required for local tree identifications and wood density estimates to become useful in monitoring of biomass and tree diversity.
Collapse
Affiliation(s)
- Ida Theilade
- Faculty of Science, Institute of Food and Resource
Economics, University of Copenhagen, Rolighedsvej 25, 1958 Frederiksberg C, Denmark
| | | | - Michael K Poulsen
- Nordic Agency for Development and Ecology (NORDECO), Skindergade 23, 1159 Copenhagen K, Denmark
| |
Collapse
|
17
|
Comerota AJ, Sandset PM, Konstantinides S, de Graaf R, Wakefield TW, Arnoldussen CWKP, Lam YL, van Gent WB, de Wolf MAF, Catarinella FS, Kurstjens RLM, Alshabatat A, Wittens CHA. Theme 4: Invasive management of (recurrent) VTE and PTS. Thromb Res 2015; 136 Suppl 1:S19-25. [PMID: 26387732 DOI: 10.1016/j.thromres.2015.07.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
| | | | - Stavros Konstantinides
- Center for Thrombosis and Hemostasis (CTH), University Medical Center Mainz, Mainz, Germany
| | - Rick de Graaf
- Department of Radiology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Thomas W Wakefield
- Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, Ann Arbor, MI, USA
| | - Carsten W K P Arnoldussen
- Department of Radiology and Interventional Radiology, VieCuri Medical Centre, Venlo, The Netherlands
| | - Yee Lai Lam
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Wijnand B van Gent
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Mark A F de Wolf
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Fabio S Catarinella
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Ralph L M Kurstjens
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Ashraf Alshabatat
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands; Department of Vascular Surgery, University Hospital Aachen, Aachen, Germany
| | - Cees H A Wittens
- Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands; Department of Vascular Surgery, University Hospital Aachen, Aachen, Germany.
| |
Collapse
|
18
|
Wittens C, Davies AH, Bækgaard N, Broholm R, Cavezzi A, Chastanet S, de Wolf M, Eggen C, Giannoukas A, Gohel M, Kakkos S, Lawson J, Noppeney T, Onida S, Pittaluga P, Thomis S, Toonder I, Vuylsteke M, Kolh P, de Borst GJ, Chakfé N, Debus S, Hinchliffe R, Koncar I, Lindholt J, de Ceniga MV, Vermassen F, Verzini F, De Maeseneer MG, Blomgren L, Hartung O, Kalodiki E, Korten E, Lugli M, Naylor R, Nicolini P, Rosales A. Editor's Choice - Management of Chronic Venous Disease: Clinical Practice Guidelines of the European Society for Vascular Surgery (ESVS). Eur J Vasc Endovasc Surg 2015; 49:678-737. [PMID: 25920631 DOI: 10.1016/j.ejvs.2015.02.007] [Citation(s) in RCA: 493] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
19
|
ESLAMIYEH H, ASHRAFZADEH F, AKHONDIAN J, BEIRAGHI TOOSI M. Homocystinuria: A Rare Disorder Presenting as Cerebral Sinovenous Thrombosis. Iran J Child Neurol 2015. [PMID: 26221164 PMCID: PMC4515342] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Objective Homocystinuria is an inborn error of amino acid metabolism caused by cystathionine beta-synthase deficiency that affects methionine metabolism. The clinical features are heterogeneous ranging from mental retardation, ectopia lentis, and osteoporosis to vascular events such as deep vein thrombosis, sagital sinus thrombosis, and myocardial infarction. Cerebral sinovenous thrombosis (CVST) is an unusual disorder in children and requires prompt and accurate management. Some causal factors for the development of CVST differ between children and adults. The majority of cases with CSVT are found to have an underlying cause for thrombosis like dehydration, infections, prothrombotic and hematologic disorders, malignancy and trauma. Although homocystinuria is usually associated with ischemic strokes, CVST as initial clinical presentation of homocystinuria is rare in children. In this article, we presented a 10-year old boy with seizure, hemiparesis, and ataxia due to CSVT caused by homocystinuria.
Collapse
Affiliation(s)
- Hossein ESLAMIYEH
- Department of Pediatric Neurology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farah ASHRAFZADEH
- Department of Pediatric Neurology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Javad AKHONDIAN
- Department of Pediatric Neurology, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mehran BEIRAGHI TOOSI
- Department of Pediatric Neurology, Mashhad University of Medical Sciences, Mashhad, Iran
| |
Collapse
|
20
|
Shiga YP, Michalak AM, Gourdji SM, Mueller KL, Yadav V. Detecting fossil fuel emissions patterns from subcontinental regions using North American in situ CO 2 measurements. Geophys Res Lett 2014; 41:4381-4388. [PMID: 25821266 PMCID: PMC4373169 DOI: 10.1002/2014gl059684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 05/30/2014] [Indexed: 06/04/2023]
Abstract
UNLABELLED The ability to monitor fossil fuel carbon dioxide (FFCO2) emissions from subcontinental regions using atmospheric CO2 observations remains an important but unrealized goal. Here we explore a necessary but not sufficient component of this goal, namely, the basic question of the detectability of FFCO2 emissions from subcontinental regions. Detectability is evaluated by examining the degree to which FFCO2 emissions patterns from specific regions are needed to explain the variability observed in high-frequency atmospheric CO2 observations. Analyses using a CO2 monitoring network of 35 continuous measurement towers over North America show that FFCO2 emissions are difficult to detect during nonwinter months. We find that the compounding effects of the seasonality of atmospheric transport patterns and the biospheric CO2 flux signal dramatically hamper the detectability of FFCO2 emissions. Results from several synthetic data case studies highlight the need for advancements in data coverage and transport model accuracy if the goal of atmospheric measurement-based FFCO2 emissions detection and estimation is to be achieved beyond urban scales. KEY POINTS Poor detectability of fossil fuel CO2 emissions from subcontinental regionsDetectability assessed via attribution of emissions patterns in atmospheric dataLoss in detectability due to transport modeling errors and biospheric signal.
Collapse
Affiliation(s)
- Yoichi P Shiga
- Department of Civil and Environmental Engineering, Stanford University Stanford, California, USA ; Department of Global Ecology, Carnegie Institution for Science Stanford, California, USA
| | - Anna M Michalak
- Department of Global Ecology, Carnegie Institution for Science Stanford, California, USA
| | - Sharon M Gourdji
- Department of Environmental and Earth Systems Science, Stanford University Stanford, California, USA
| | - Kim L Mueller
- Science and Technology Policy Institute Washington, District of Columbia, USA
| | - Vineet Yadav
- Department of Global Ecology, Carnegie Institution for Science Stanford, California, USA
| |
Collapse
|
21
|
Qureshi AI, Rahman HA, Adil MM, Hassan AE, Miley JT. Aortic arch calcification, procedural times, and outcomes of endovascular treatment in patients with acute ischemic stroke. J Vasc Interv Neurol 2014; 7:1-6. [PMID: 25132902 PMCID: PMC4132946] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To determine the frequency of aortic arch calcification and it's relationship with procedural times, angiographic recanalization, and discharge outcomes in acute ischemic stroke patients undergoing endovascular treatment. METHODS The thoracic component of computed tomographic (CT) angiogram were reviewed by an independent reviewer to determine presence of any calcification; and the severity of calcification was graded as follows: mild, single small calcifications; moderate, multiple small calcifications; or severe, one or more large calcifications. RESULTS Aortic arch calcification was present in 120 (62.4%) of 188 patients and severity was graded as mild (n=24), moderate (n=44), and severe (n=52). Compared with patients without calcification, the mean intracranial access time (minutes ± SD) was similar among patients with aortic arch calcification (70 ± 31 versus 64 ± 31, p=0.9). The mean time intracranial access time increased with increasing severity of aortic arch calcification (61±27, 67±29, and 74±34, p=0.3). Patients with aortic arch calcification had similar rates of complete or partial recanalization [85 (71%) versus 50 (76%)], p=0.6) but lower rates of favorable outcomes [modified Rankin scale 0-2] at discharge 27 (22%) versus 26 (39%), p=0.02). CONCLUSIONS A high proportion of acute ischemic stroke patients have aortic arch calcification which is associated with lower rates of favorable outcome following endovascular treatment. ABBREVIATIONS SDstandard deviationICHintracerebral hemorrhageNIHSSNational Institutes of Health Stroke ScaleTIAtransient ischemic attackICHintracerebral hemorrhagemRSmodified Rankin scale.
Collapse
Affiliation(s)
| | | | - Malik M Adil
- Zeenat Qureshi Stroke Institute, St. Cloud, MN, USA
| | | | | |
Collapse
|
22
|
Dababneh H, Guerrero WR, Moussavi M, Hussain M, Kirmani JF. Ulcerative colitis presenting with bilateral thalamic infarcts due to cerebral sinus thrombosis. J Vasc Interv Neurol 2014; 7:27-28. [PMID: 25132908 PMCID: PMC4132942] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
|
23
|
Albisetti M, Kellenberger CJ, Bergsträsser E, Niggli F, Kroiss S, Rizzi M, Schmugge M. Port-a-cath-related thrombosis and postthrombotic syndrome in pediatric oncology patients. J Pediatr 2013; 163:1340-6. [PMID: 23992671 DOI: 10.1016/j.jpeds.2013.06.076] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [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: 01/30/2013] [Revised: 05/13/2013] [Accepted: 06/27/2013] [Indexed: 10/26/2022]
Abstract
OBJECTIVE To investigate Port-A-Cath (PAC)-related thrombosis and postthrombotic syndrome (PTS) in children with cancer. STUDY DESIGN The study population was a consecutive cohort of children diagnosed with cancer and a PAC implanted at diagnosis. Children were evaluated for the presence of PAC-related thrombosis by magnetic resonance venography and the presence of congenital prothrombotic risk factors and PTS. RESULTS A total of 114 children (median age, 6.04 years) were included. Of these children, 48 (42%) were treated for solid tumors and 66 (58%) were treated for hematopoietic tumors, including 38 for acute lymphoblastic leukemia. At the time of magnetic resonance venography, 42 children (37%) had the PAC still in place, and 72 (63%) had the PAC removed. Overall, PACs were in place for a total of 324.92 PAC-years. PAC-related thrombosis was detected in 45 children (39.5%) with a current or previous PAC. Of these, 21 (47%) had a solid tumor, 14 (31%) had acute lymphoblastic leukemia, and 10 (22%) had another hematopoietic tumor. Younger age at diagnosis, female sex, duration of PAC use, and left-side PAC placement were independently associated with an increased risk of thrombosis, whereas asparaginase therapy and the presence of inherited prothrombotic risk factors were not. Mild PTS (ie, presence of prominent collateral vessels in the skin) was present in 5.6% of the children. CONCLUSION PAC-related thrombosis is common in pediatric oncology patients. In some children, thrombotic complications can lead to the development of PTS.
Collapse
Affiliation(s)
- Manuela Albisetti
- Division of Hematology, University Children's Hospital, Zurich, Switzerland; Children's Research Center, University Children's Hospital, Zurich, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
24
|
Ridha MA, Saindane AM, Bruce BB, Riggeal BD, Kelly LP, Newman NJ, Biousse V. MRI findings of elevated intracranial pressure in cerebral venous thrombosis versus idiopathic intracranial hypertension with transverse sinus stenosis. Neuroophthalmology 2013; 37:1-6. [PMID: 24019557 DOI: 10.3109/01658107.2012.738759] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [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: 11/13/2022] Open
Abstract
PURPOSE To determine whether MRI signs suggesting elevated intracranial pressure (ICP) are preferentially found in patients with idiopathic intracranial hypertension (IIH) than in those with cerebral venous thrombosis (CVT). METHODS Among 240 patients who underwent standardized contrast-enhanced brain MRI/MRV at our institution between 9/2009 and 9/2011, 60 with abnormal imaging findings on MRV were included: 27 patients with definite IIH, 2 patients with presumed IIH, and 31 with definite CVT. Medical records were reviewed, and imaging studies were prospectively evaluated by the same neuroradiologist to assess for presence or absence of transverse sinus stenosis (TSS), site of CVT if present, posterior globe flattening, optic nerve sheath dilation/tortuosity, and the size/appearance of the sella turcica. RESULTS 29 IIH patients (28 women, 19 black, median-age 28, median-body mass index, 34) had bilateral TSS. 31 CVT patients (19 women, 13 black, median-age 46, median-BMI 29) had thrombosis of the sagittal (3), sigmoid (3), cavernous (1), unilateral transverse (7), or multiple (16) sinuses or cortical veins (1). Empty/partially-empty sellae were more common in IIH (3/29 and 24/29) than in CVT patients (1/31 and 19/31) (p<0.001). Flattening of the globes and dilation/tortuosity of the optic nerve sheaths were more common in IIH (20/29 and 18/29) than in CVT patients (13/31 and 5/31) (p<0.04). CONCLUSION Although abnormal imaging findings suggestive of raised ICP are more common in IIH, they are not specific for IIH and are found in patients with raised ICP from other causes such as CVT.
Collapse
Affiliation(s)
- Maysa A Ridha
- Department of Ophthalmology (MR, BB, BR, LK, NN, VB), Emory University, Atlanta, Georgia, USA
| | | | | | | | | | | | | |
Collapse
|
25
|
Horev A, Hallevy H, Plakht Y, Shorer Z, Wirguin I, Shelef I. Changes in cerebral venous sinuses diameter after lumbar puncture in idiopathic intracranial hypertension: a prospective MRI study. J Neuroimaging 2012; 23:375-8. [PMID: 22913783 DOI: 10.1111/j.1552-6569.2012.00732.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Idiopathic intracranial hypertension (IIH), is characterized by elevated intracranial pressure (ICP) without a clear cause. Recently it was shown that in more than 90% of the IIH patients there is stenosis of the transverse dural sinuses. In this study we assessed the changes in diameter of cerebral veins after lumbar puncture, in order to have some more insight regarding the volume and pressure influence on cerebral veins. METHODS We prospectively included 13 patients suspected with IIH, admitted for investigation in the Soroka medical center. All the patients had a lumbar puncture (LP) with opening pressure measurement and CSF analysis, and two MRI-MRV studies: one before the LP and one after it. Measurements of the cerebral venous sinuses diameter were performed. RESULTS Significant stenosis of both transverse sinuses was found before LP in IIH patients with an average diameter of 1.77 mm of the right TS, and 1.57 mm of the left TS. After the LP, there was a significant increase in all venous sinuses diameters (P < .05). There was no correlation between the changes in diameter of the venous sinuses after LP and opening pressure measured or BMI. CONCLUSIONS Our results support other studies and demonstrated narrowing of the transverse sinuses in IIH patients. The main finding of this study is the increase in cerebral sinuses diameter after LP. This observation should be considered when evaluating cerebral venous sinuses after LP. A larger scale study is warranted to validate our findings.
Collapse
Affiliation(s)
- Anat Horev
- Department of Neurology, Soroka University Medical Center, Beer-Sheva, Israel.
| | | | | | | | | | | |
Collapse
|