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Conventional and variant termination of the portal vein in a black Kenyan population

100%

Munguti J., Awori K., Odula P., Ogeng'o J.

Folia Morphologica

2013

tom 72

nr 1

Background: Knowledge of the variant terminations of the portal vein (PV) is important in surgical and interventional radiological procedures of the liver. Their pattern and frequency are important in planning surgery to minimise complications. They differ between populations, but data from Africa is unavailable. The aim of the study is investigate the variant termination of the main PV. Materials and methods: Materials and methods: One hundred livers from adult black Kenyans (age range 35–79 years) were studied at the Department of Human Anatomy, University of Nairobi, Kenya by gross dissection. The livers were cleared of blood, fixed with 10% formaldehyde solution, and the venous system infused with acrylate monomers to keep the veins firm. The level of termination relative to the capsule and the branching pattern of the PV were examined. Various patterns were photographed using a digital camera. Data was analysed using SPSS version 16.0 for windows and presented in tables and macrographs. Results: Results: Portal vein termination was extracapsular in 14%, capsular in 40%, and intrahepatic in 46% of examined cases. Variant termination occurred in 49% of cases while conventional bifurcation occurred in 51% of cases. The level of termination of the PV had a positive correlation with its pattern (p = 0.05). Conclusions: The high p Conclusions: revalence of variant termination of PV in the current study suggests that the population is more vulnerable to inadvertent injury during surgery and radiological intervention. Moreover, an extra hepatic termination of the PV is more likely to have a conventional branching pattern compared to an intra-hepatic termination. (Folia Morphol 2013; 72, 1: 57–62)

Sex variations in the structure of human atrioventricular annuli

88%

El-Busaid H., Hassan S., Odula P., Ogeng'o J., Ndung'u B.

Folia Morphologica

2012

tom 71

nr 1

Atrioventricular annuli are important in haemodynamic flexibility, competence, and support for tricuspid and mitral valves. The anatomical features of the annuli, such as circumference, organisation of connective tissue fibres, myocardium, and cellularity, may predispose to annular insufficiency and valvular incompetence. These pathologies occur more commonly in females, although the anatomical basis for this disparity is unclear. Sex variation in the structure of the annuli is important in providing a morphological basis for the patterns of these diseases. This study therefore aimed to determine the sex variations in the structure of human atrioventricular annuli. One hundred and one hearts (48 males, 53 females) obtained from the Department of Human Anatomy of the University of Nairobi were studied. Annular circumferences were measured using a flexible ruler and corrected for heart weight. Results were analysed using SPSS version 17.0 and sex differences determined using student’s t-test. A p-value of less than 0.05 was considered significant. For light microscopy, specimens were harvested within 48 hours post-mortem, processed, sectioned, and stained with Masson’s trichrome and Weigert’s elastic stain with van Gieson counterstaining. Females had significantly larger annular circumferences than males after correcting for heart weight (p ≤ 0.05). Histologically, myocardium was consistently present in all male annuli while this was absent in females except in one specimen. The annuli were more elastic and cellular in males especially in the annulo-myocardial and annulo-valvular zones, respectively. The corrected larger annular circumference in females may limit heart valve coaptation during cardiac cycle and may be a risk factor for valvular insufficiency. The predominance of myocardium, annular cellularity, and elasticity may be more protective against heart valve incompetence in males than in females. (Folia Morphol 2012; 71: 1: 23–27)

Ograniczanie wyników

2 Folia Morphologica

2 Odula P.

2 Ogeng'o J.

1 Awori K.

1 El-Busaid H.

1 Hassan S.

1 Munguti J.

1 Ndung'u B.

1 2013

1 2012

Wyniki wyszukiwania

Conventional and variant termination of the portal vein in a black Kenyan population

Sex variations in the structure of human atrioventricular annuli