N Ayez

Publications (2)7.52 Total impact

• Article: The basilic vein and the cephalic vein perform equally in upper arm arteriovenous fistulae.

  N Ayez, V A van Houten, A A de Smet, A M van Well, G P Akkersdijk, P J van de Ven, B Fioole
  [show abstract] [hide abstract]
  ABSTRACT: To compare the brachiocephalic (BC) and basilic vein transposition (BVT) arteriovenous fistula (AVF) with regard to maturation, patency, blood flow and complication rates. A retrospective chart review. Between January 2000 and December 2010, consecutive patients undergoing BC or BVT AVF were included. Patient characteristics were collected retrospectively from digital patient files and a prospective database of haemodialysis patients. A total of 173 autologous upper arm AVFs (87 BC and 86 BVT) were created in 151 patients. Mean (±SEM) follow-up was 19 ± 1.4 months (range 0-100). There were no differences between the groups in respect to brachial artery and cubital fossa vein diameters, time to first use, flow and the number of secondary interventions. Operative time was significantly longer (P < 0.001) and the mid upper arm vein diameter before bifurcation greater (P = 0.038) in BVT patients. The 1- and 2-year primary patency rates for the whole cohort was 40.8% and 30.2% with secondary patency rates of 78.0% and 72.4%. There was no difference between the groups for these outcomes (P = 0.951, P = 0.516, respectively). With the exception of the efferent vein diameter in the mid upper arm and operative time, there was no difference between a BC and BVT AVF.
  European journal of vascular and endovascular surgery: the official journal of the European Society for Vascular Surgery 05/2012; 44(2):227-31. · 2.92 Impact Factor
• Article: Body composition and outcome in patients undergoing resection of colorectal liver metastases.

  M G van Vledder, S Levolger, N Ayez, C Verhoef, T C K Tran, J N M Ijzermans
  [show abstract] [hide abstract]
  ABSTRACT: Recent evidence suggests that depletion of skeletal muscle mass (sarcopenia) and an increased amount of intra-abdominal fat (central obesity) influence cancer statistics. This study investigated the impact of sarcopenia and central obesity on survival in patients undergoing liver resection for colorectal liver metastases (CLM). Diagnostic imaging from patients who had hepatic resection for CLM in one centre between 2001 and 2009, and who had assessable perioperative computed tomograms, was analysed retrospectively. Total cross-sectional areas of skeletal muscle and intra-abdominal fat, and their influence on outcome, were analysed. Of the 196 patients included in the study, 38 (19·4 per cent) were classified as having sarcopenia. Five-year disease-free (15 per cent versus 28·5 per cent in patients without sarcopenia; P = 0·002) and overall (20 per cent versus 49·9 per cent respectively; P < 0·001) survival rates were lower for patients with sarcopenia at a median follow-up of 29 (range 1-97) months. Sarcopenia was an independent predictor of worse recurrence-free (hazard ratio (HR) 1·88, 95 per cent confidence interval 1·25 to 2·82; P = 0·002) and overall (HR 2·53, 1·60 to 4·01; P < 0·001) survival. Central obesity was associated with an increased risk of recurrence in men (P = 0·032), but not in women (P = 0·712). Sarcopenia has a negative impact on cancer outcomes following resection of CLM.
  British Journal of Surgery 04/2012; 99(4):550-7. · 4.61 Impact Factor