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Taioli E, Du Y, Yong M, Fryzek J. P004 Incidence of myelodysplastic syndrome in Western Pennsylvania. Leuk Res 2009. [DOI: 10.1016/s0145-2126(09)70084-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hänggi D, Turowski B, Beseoglu K, Yong M, Steiger HJ. Intra-arterial nimodipine for severe cerebral vasospasm after aneurysmal subarachnoid hemorrhage: influence on clinical course and cerebral perfusion. AJNR Am J Neuroradiol 2008; 29:1053-60. [PMID: 18372422 DOI: 10.3174/ajnr.a1005] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE The efficacy of intra-arterial administration of nimodipine (IAN) in patients with severe vasospasm after aneurysmal subarachnoid hemorrhage (SAH) remains unproved. The goal of the present study was to investigate the clinical effect and cerebral perfusion after IAN in patients with severe vasospasm refractory to hemodynamic treatment. MATERIALS AND METHODS Twenty-six of 214 patients with aneurysmal SAH were included in the prospective study, approved by the local ethics committee. All patients met the criteria of medically refractory cerebral vasospasm. Effectiveness was monitored angiographically by digital subtraction angiography and by transcranial Doppler (TCD), perfusion CT (PCT), and neurologic examination during treatment course and follow-up. RESULTS No angiographic effect was observed in 8 patients. The pooled PCT values revealed a reduction of time to peak (P = .03) and mean transit time (P = .17) 1 day after intervention. This effect did not persist during the following days. The pooled TCD analysis demonstrated a transient increase in flow 1 day after intervention (P = .03). No trend was evident during the next 7 days after intervention. Additional infarction was experienced by 61.1% of patients. CONCLUSIONS IAN in a selective patient group resulted in a positive response with reduction of angiographic vasospasm and increase in cerebral perfusion as detected by PCT after 24 hours. Therefore, IAN appears more effective than intra-arterial papaverine. Nevertheless the efficacy of IAN is temporary. Therefore, the search for more effective treatment strategies to reduce critical vasospasm and to improve cerebral perfusion must be continued.
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Affiliation(s)
- D Hänggi
- Department of Neurosurgery, Heinrich-Heine-University, Düsseldorf, Germany.
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Kraft CN, Scharfstädt A, Yong M, Westhoff B, Urban N, Falkenhausen MV, Pennekamp PH. Zusammenhang zwischen Rückenschmerzen und kernspintomografischen LWS-Befunden bei Hochleistungsvoltigierern. Sportverletz Sportschaden 2007; 21:142-7. [PMID: 17896330 DOI: 10.1055/s-2007-963542] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
INTRODUCTION A connection between morphologic lesions of the spine and specific sport disciplines incorporating torsional and hyperextension forces has been found. Although vaulting incorporates a significant amount of figures known from gymnastics, little is known about the influence of this sport on the lower back. The aim of our study was to assess to what extent vaulters suffer from back pain and whether these symptoms correlate to findings in magnetic resonance imaging (MRI) of the lumbar spine. METHODS 20 high level vaulters ( [see text] age 21.95 [15 - 36] years) were included in the study. Using a standardised questionnaire biometric data, training intensity, localisation as well as intensity of back pain (VAS) was assessed. 12 of these vaulters agreed to an MRI scan of their lumbar spine. Scans were evaluated for morphologic changes using a semiquantative score and the results were correlated to clinical symptoms. RESULTS 17 / 20 (85 %) reported of back pain of which 15 (75 %) had daily pain, the remaining 2 only occasionally. The average pain intensity on the visual analogue scale (VAS) was reported to be 3.76 +/- 0.53. The MRI scans revealed only slight degenerative changes of the lumbar spine. Statistical analysis of the data (Spearman's rank test) could not show a significant correlation between clinical symptoms and morphologic MRI-changes. CONCLUSION Vaulters, compared to riders of other disciplines, seem to suffer from recurrent back pain to a greater extent. Despite the fact that the lumbar spine is confronted with repetitive torsional and hyperextension forces, vaulters do not show undue early degenerative changes or marked lesions of the lumbar spine. Recurrent back pain in the vaulter is most likely due to functional problems. It seems unlikely that is based on manifest morphologic changes of the lower back.
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Affiliation(s)
- C N Kraft
- Klinik für Orthopädie, Unfall- und Handchirurgie, Klinikum Krefeld.
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Yong M, Wessels S, Alawattegama AB, Jones K. Response to Six Sigma study group's article regarding releasing capacity in sexual health through modernization. Int J STD AIDS 2007; 18:649. [PMID: 17785016 DOI: 10.1258/095646207781568619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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55
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Krause BJ, Poeppel TD, Reinhardt M, Vester EG, Yong M, Mau J, Strauer BE, Vosberg H, Müller HW. Myocardial perfusion/metabolism mismatch and ventricular arrhythmias in the chronic post infarction state. Nuklearmedizin 2005; 44:69-75. [PMID: 15968413 DOI: 10.1267/nukl05030069] [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] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
AIM Ventricular arrhythmias have been shown to originate in the myocardial peri-infarct region due to irregular heterotopic conduction. Hypoperfused but viable myocardium is often localised in those areas and may be involved in the pathogenesis of arrhythmias. We tested the hypothesis that these myocardial perfusion/metabolism mismatches (MM) are significantly associated with ventricular arrhythmias in the chronic post infarction state. PATIENTS, METHODS 47 post infarction patients were included in the study. 33 suffered from ventricular arrhythmia whereas 14 did not. All patients underwent (99m)Tc tetrofosmin SPECT and (18)F-FDG PET. A region-of-interest(ROI)-analysis was used to assess viable myocardium based on predefined MM-criteria. Univariate analyses as well as a logistic regression model for the multivariate analysis were carried out. RESULTS 94% of the arrhythmic patients displayed at least one MM-segment as compared to 64% of the non-arrhythmic patients. MM-segments and arrhythmia showed a statistically significant relation (p = 0.018). The logistic regression model predicted the occurrence or absence of arrhythmia in 85% of all cases. Multivariate analysis gave consistent results, after adjusting for symptomatic chronic heart failure (CHF), aneurysms and age. CONCLUSION Our results support the hypothesis that hypoperfused but viable myocardium represents an arrhythmogenic substrate and is a relevant risk factor for developing ventricular arrhythmias following myocardial infarction. Therefore, the detection of MM-segments allows the identification of patients with a higher risk for future cardiac events.
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Affiliation(s)
- B J Krause
- Abteilung Nuklearmedizin, Radiologie III, Universitätsklinikum Ulm, Robert-Koch-Strasse 8, 89081 Ulm, Germany.
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Mau J, Behneke A, Behneke N, Fritzemeier C, Gomez-Roman G, d'Hoedt B, Spiekermann H, Strunz V, Yong M. Randomized multicenter comparison of 2 IMZ and 4 TPS screw implants supporting bar-retained overdentures in 425 edentulous mandibles. J Prosthet Dent 2004. [DOI: 10.1016/j.prosdent.2004.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Durand P, Pointier JP, Escoubeyrou K, Arenas JA, Yong M, Amarista M, Bargues MD, Mas-Coma S, Renaud F. Occurrence of a sibling species complex within neotropical lymnaeids, snail intermediate hosts of fascioliasis. Acta Trop 2002; 83:233-40. [PMID: 12204396 DOI: 10.1016/s0001-706x(02)00128-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 11/30/2022]
Abstract
The delimitation of cryptic species within the genus Lymnaea, which are the main vectors of fascioliasis, remains a topic of controversy. An analysis of genetic variability based on 12 enzyme loci revealed different fixed alleles at 9 loci between two sympatric samples of Lymnaea viatrix at the type locality in Lima, Peru. The absence of heterozygotes within this locality indicates the presence of isolated populations or cryptic species within L. viatrix. Significant genetic differences were also found between these two L. viatrix samples from Lima and other populations of L. viatrix in South America and in addition to species such as L. truncatula, L. cubensis and L. columella. Moreover, the lack of variability within each Lymnaea samples studied indicates the existence of a high selfing rate in each species.
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Affiliation(s)
- P Durand
- CEPM, UMR CNRS-IRD 9926, 911, Avenue Agropolis, BP 5045, 34032 Montpellier Cedex 1, France.
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DeJong RJ, Morgan JA, Paraense WL, Pointier JP, Amarista M, Ayeh-Kumi PF, Babiker A, Barbosa CS, Brémond P, Pedro Canese A, de Souza CP, Dominguez C, File S, Gutierrez A, Incani RN, Kawano T, Kazibwe F, Kpikpi J, Lwambo NJ, Mimpfoundi R, Njiokou F, Noël Poda J, Sene M, Velásquez LE, Yong M, Adema CM, Hofkin BV, Mkoji GM, Loker ES. Evolutionary relationships and biogeography of Biomphalaria (Gastropoda: Planorbidae) with implications regarding its role as host of the human bloodfluke, Schistosoma mansoni. Mol Biol Evol 2001; 18:2225-39. [PMID: 11719572 DOI: 10.1093/oxfordjournals.molbev.a003769] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The wide geographic distribution of Schistosoma mansoni, a digenetic trematode and parasite of humans, is determined by the occurrence of its intermediate hosts, freshwater snails of the genus Biomphalaria (Preston 1910). We present phylogenetic analyses of 23 species of Biomphalaria, 16 Neotropical and seven African, including the most important schistosome hosts, using partial mitochondrial ribosomal 16S and complete nuclear ribosomal ITS1 and ITS2 nucleotide sequences. A dramatically better resolution was obtained by combining the data sets as opposed to analyzing each separately, indicating that there is additive congruent signal in each data set. Neotropical species are basal, and all African species are derived, suggesting an American origin for the genus. We confirm that a proto-Biomphalaria glabrata gave rise to all African species through a trans-Atlantic colonization of Africa. In addition, genetic distances among African species are smaller compared with those among Neotropical species, indicating a more recent origin. There are two species-rich clades, one African with B. glabrata as its base, and the other Neotropical. Within the African clade, a wide-ranging tropical savannah species, B. pfeifferi, and a Nilotic species complex, have both colonized Rift Valley lakes and produced endemic lacustrine forms. Within the Neotropical clade, two newly acquired natural hosts for S. mansoni (B. straminea and B. tenagophila) are not the closest relatives of each other, suggesting two separate acquisition events. Basal to these two species-rich clades are several Neotropical lineages with large genetic distances between them, indicating multiple lineages within the genus. Interesting patterns occur regarding schistosome susceptibility: (1) the most susceptible hosts belong to a single clade, comprising B. glabrata and the African species, (2) several susceptible Neotropical species are sister groups to apparently refractory species, and (3) some basal lineages are susceptible. These patterns suggest the existence of both inherent susceptibility and resistance, but also underscore the ability of S. mansoni to adapt to and acquire previously unsusceptible species as hosts. Biomphalaria schrammi appears to be distantly related to other Biomphalaria as well as to Helisoma, and may represent a separate or intermediate lineage.
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Affiliation(s)
- R J DeJong
- Department of Biology, University of New Mexico, Albuquerque 87131, USA
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Gutierrez A, Yong M, Wong L, Sánchez J. The combined effect of isolation and Fasciola hepatica infection on the life history traits of Fossaria cubensis. J Invertebr Pathol 2001; 78:66-71. [PMID: 11812108 DOI: 10.1006/jipa.2001.5044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 11/22/2022]
Abstract
Life history traits of Fossaria cubensis were compared between isolated and paired snails after infection with three miracidia of Fasciola hepatica. Four experimental groups were tested: isolated-unexposed, paired-unexposed, isolated-infected, and paired-infected. A repeated-measures ANOVA showed statistically significant interactions among isolation, infection, and age effects for shell size, number of egg masses per snail, number of eggs per snail, and number of viable eggs per snail. Isolated-unexposed snails exhibited the higher values of these variables and those of survival and finite and intrinsic rates of natural increase. Infection stimulated shell growth during the prepatent period, but differences were present only in paired snails since isolation causes a similar effect. Reproduction, in terms of the number of egg masses per snail and the number of eggs per mass per snail, decreases in the presence of parasitic infection, whereas isolation stimulates it. These effects were observed from early stages of infection.
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Affiliation(s)
- A Gutierrez
- Laboratorio de Malacología, IPK, Apartado 601, Marianao 13, La Habana, Cuba
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Gutiérrez A, Perera G, Yong M, Lin W. The effect of isolation on the life-history traits of Pseudosuccinea columella (Pulmonata: Lymnaeidae). Mem Inst Oswaldo Cruz 2001; 96:577-81. [PMID: 11391433 DOI: 10.1590/s0074-02762001000400021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [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: 11/22/2022] Open
Abstract
A population of Pseudosuccinea columella was raised under laboratory conditions and its life tables were determined in isolated and paired snails. Isolated snails were significantly larger in shell size than paired snails from five weeks of age onward. Also, statistically significant differences were found for the number of eggs per mass per individual from week 5 to 9, isolated snails exhibiting the highest values. The intrinsic and finite rates of increase were greater in isolated than in paired snails. Either an inhibition of the reproductive output between individuals or the advantage of selfing may be the cause of the differences in this species, acting as a possible mechanism that increase the fitness of isolated snails.
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Affiliation(s)
- A Gutiérrez
- Laboratorio de Malacología, Instituto 'Pedro Kourí, La Habana, Cuba.
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Gutiérrez A, Perera G, Yong M, Sánchez J, Lin W. Life-history traits of Fossaria cubensis (Gastropoda: Lymnaeidae) under experimental exposure to Fasciola hepatica (Trematoda: Digenea). Mem Inst Oswaldo Cruz 2000; 95:747-52. [PMID: 10998229 DOI: 10.1590/s0074-02762000000500025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/21/2022] Open
Abstract
The effect of exposing the lymnaeid snail Fossaria cubensis to the trematode Fasciola hepatica on the snail population's life-history traits was studied under laboratory conditions. Exposed individuals showed a lower survival rate than control snails, although from week 7 onward a slower decrease of this parameter in relation to the control group was observed. There were higher values of fecundity rate for the controls compared to the exposed group except during weeks 9, 10, 11 and 12, which was the time that followed the period when almost all of the infected snails died. Both the intrinsic and finite rates of natural increase were significantly higher for the control group, but exposed snails still attained a lower mean generation time. Age-specific trade-offs were found, mainly for the weekly increase in size versus the number of eggs per mass, the weekly increase in size versus the number of viable eggs per mass, the number of masses versus the hatching probability and the number of eggs versus the hatching probability. All these negative associations were significant for juveniles of both control and exposed snails and not for adults; however, exposed young individuals exhibited much higher values of the correlation coefficient than control animals.
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Affiliation(s)
- A Gutiérrez
- Laboratorio de Malacología, Instituto 'Pedro Kourí', La Habana, Cuba.
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Durand P, Yong M, Perera G, Ducreux A, Pointier JP. Genetic evidence of two species in the Biomphalaria havanensis complex (Gastropoda. Planorbidae) from Cuba. Acta Trop 1998; 71:179-88. [PMID: 9821466 DOI: 10.1016/s0001-706x(98)00069-2] [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: 10/18/2022]
Abstract
In Cuba, several species of freshwater gastropods belonging to the genus Biomphalaria have been described according to morphological characters. However, the taxonomy of this group remains unclear and a number of synonyms are often cited in the literature. This is the case for B. havanensis whose taxonomical status is not well established. Multilocus enzyme electrophoresis at 18 loci was carried out on adult snails of B. havanensis from the type locality in Havana and from several other sites harbouring a morphologically slightly different form, referred to here as Biomphalaria sp. Another local distinct species B. helophila was used as an outgroup. Allelic distribution showed the presence of nine and 12 diagnostic loci between B. havanensis and Biomphalaria sp. and B. helophila, respectively. We detected eight fixed alleles between Biomphalaria sp. and B. helophila. The genetic divergence estimated by absolute genetic distances strongly supports the assumption that Biomphalaria sp. is quite different from the sympatric B. havanensis, morphologically the closest species.
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Affiliation(s)
- P Durand
- Laboratoire de Biologie Animale, UMR 5555 du CNRS, Perpignan, France
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Affiliation(s)
- M Yong
- Department of Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Raja Muda, Kuala Lumpur
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Perera G, Yong M, Ferrer JR, Arrinda C, Amador O. [Malacologic studies at the Instituto de Medicina Tropical "Pedro Kourí"]. Rev Cubana Med Trop 1988; 40:103-8. [PMID: 3067273] [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: 01/04/2023]
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Perea G, Sánchez R, Yong M. [Comparison of growth rate of Helisoma duryi (Wetherby, 1879) and Helisoma scalare (Jay, 1839) (Mollusca: Planorbidae)]. Rev Cubana Med Trop 1985; 37:150-4. [PMID: 3914002] [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: 01/08/2023]
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