[ long-term results of transsternal thymectomy and its related factors in patients with myasthenia gravis presenting at Loghman Hakim hospital in Tehran during 1993-2007: a descriptive study]

Myasthenia gravis is an autoimmune disease characterized by production of autoantibody directly against acetylcholine receptors on postjunctional membranes. The complete removal of the thymus has been the logical goal of operation, but there has been controversy on its relation to long term results. In this study, we try to describe the efficacy of long term result of transsternal thymectomy, and the rate of improvement in patients with myasthenia gravis that presented to Loghman Hakim Hospital, in Tehran, between 1993 and 2007. The study descriptively analyzed all patients with general myasthenia gravis with transsternal thymectomy. At first all patients with myasthenia gravis on the study year's period were found and invited. Efficacy of surgery was studied with dosage of used drug, signs, age, sex, thymus pathology, etc. and was statistically expressed. A maximum of 15 years of postsurgery followup was studied [Mean= 9 yrs]. In study years, 63 patients underwent thymectomy, 48 of whom met the criteria to enroll in our study [76.2%]. Overall, surgical benefit after thymectomy was 77% and 31.2% of the patients were completely cured. In 45.8% of the patients, drug doses were reduced. In 18.7% of the patients drug dose had not changed. In 4.2% of patients, the disease had progressed. Most of the improvement was seen in the first 2 years postthymectomy. Thymectomy is a beneficial treatment modality in patients with generalized myasthenia gravis. The efficacy of transsternal thymectomy for myasthenia gravis had satisfactory results by examining and long-term follow-up of patients. But further investigation in mass population in clinical trials is needed

[Single dose versus triple dose of antibiotic in prophylaxis of wound infection in acute appendicitis: prospective randomized study]

Wound infection is one of the most common problems in surgery and antibiotic usage is one of the ways to prevent it. This Study was performed for six months. All patients who were admitted for acute appendicitis in even days were given single dose of 500mg of metronidazole via IV route and all the patients who were admitted in the odd days were given single dose of 500mg metronidazole via IV route, plus two Separate doses of metronidazole in post operation period. There were 145 patient who were evaluated for this study with 115 male [%79.3] and 30 female [%20.7]. The first group [n=69] were received single dose of metronidazole where the second group [n=76] were received three doses of metronidazole. All patients had not any signs of wound infection. There weren't any meaningful statistical differences for prophylaxis of wound infection between single dose and multiple dose of antibiotic