This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'All of the following are risk factors for postoperative infection after hysterectomy except : \nSelect and explain. \nA. Urinary catheterization > 7 days, B. Use of blood transfusion, C. Surgery for malignancy, D. Age > 50 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. Use of blood transfusion Friends, let\'s discuss each option one by one. Urinary catheterization (Option \'a) It is very obvious that urinary catheterization for > 7 days will increase the chances of post operative infection. "Almost all nosocomial UT/ are associated with preceeding instrumentation and indwelling catheter, which create a 3-10% risk of infection each day." Surgery for malignancy (Option \'c) Telinde\'s Operative Gynaecology 9/e, p 197 and William Gynae, l/e p 77 gives a list of risk factors for Post Operative Infection. Risk factors for Postoperative Infection : Altered immunocompetence Obesity Bacterial vaginosis Excessive intraoperative blood loss Telinde\'s Operative Gynaecology Radical surgery - a/w prolonged surgical procedure (>3-5 hrs) Prolonged preoperative hospitalization Operative inexperience * Lower socioeconomic status * Poor nutrition * Excessive devitalized tissue * Diabetes mellitus * Failure to use prophylactic anitbiotics * Surgery in an infected operative site. Young age/old age (Williams Gynae 1/e, p 77) From the table it is clear : Radical surgery which is carried out for carcinoma endometrium and carcinoma cervix carries risk for postoperative infection. (Option "c") As far as age is concerned : Telinde operative gynaecology 9/e. p 196 says: "Young age has been considered a risk factor for vaginal posthysterectomy infection, although the exact reason is unclear." And table in Williams Gynae lie. p 77 gives old age as a risk factors for abdominal hysterectomy and young age as a risk factor for vaginal hysterectomy. This leaves us with option \'b\' i.e. use of blood transfusion. Though theoretically by blood transfusion risk of infection with - HIV. hepatitis B/C, G etc is high but practically the technique by which blood is prepared there is minimal risk .', 'role': 'assistant'}]