system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Adult, Aged, Arterial Occlusive Diseases, Carbon Monoxide, Case-Control Studies, Constriction, Pathologic, Diabetes Complications, Disease Susceptibility, Female, Follow-Up Studies, Graft Occlusion, Vascular, Graft Survival, Homocysteine, Humans, Hyperplasia, Inguinal Canal, Leg, Male, Middle Aged, Phlebotomy, Risk Factors, Single-Blind Method, Smoking, Tunica Intima, Ultrasonography, Doppler, Duplex, Vascular Patency, Veins.
user
Is hyperhomocysteinaemia a risk factor for vein graft stenosis? Context: Many infrainguinal vein graft failures are due to progressive vein graft stenosis (VGS) from intimal hyperplasia. Systemic factors have been implicated in the aetiology of intimal hyperplasia. Hyperhomocysteinaemia (HHCA) is established as an independent risk factor for coronary and peripheral arterial disease. The objective of this study was to examine the influence of HHCA and other serological factors upon the development of VGS. Thirty-eight patients who had undergone infrainguinal vein bypass were recruited to a case/control study from a graft surveillance program. Nineteen patients with documented VGS were matched against controls without stenosis for age, sex, length of time from surgery, diabetes, smoking history and preoperative symptom score. All patients were recalled for Duplex ultrasound scans, venesection and carbon monoxide estimation which were performed in a blinded fashion. Statistical analysis of all parameters revealed that plasma homocysteine was significantly elevated in patients with VGS (p < 0.3, Wilcoxon rank sum).
assistant
These results suggest that HHCA is a previously unidentified risk factor for VGS. Patients with HHCA are susceptible to VGS and preoperative investigation would allow identification of patients at risk. Final Decision: yes