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Articles by A. Mohammadzadeh
Total Records ( 3 ) for A. Mohammadzadeh
  A. Mohammadzadeh , M.J. Valadan Zoej and A. Tavakoli
  In this study, using few samples from road surface, a continuous genetic algorithm is applied to a fuzzy based mean calculation system to obtain road mean values in each band of high resolution satellite colour images. Then, the images are segmented using the calculated mean values from the self-learning fuzzy-GA system. The proposed self-learning fuzzy-GA algorithm calculated best mean value with sub grey level precision. The method is applied to simulated images where the calculated mean values are consistent with the hypothetic mean values. Application of the method to IKONOS satellite images has shown a prospective outcome. Mathematical morphology is subsequently used to extract an initial main road centerline from the segmented image. Then, small redundant segments are automatically removed. The quality of the extracted road centerline indicates the effectiveness of the proposed approach.
  H. Talebi , A. Nourozi , S. Fateh , A. Mohammadzadeh , P. Eghtesadi-Araghi , S. Jabbari and M. Kalantarian
  The objective of this study was to evaluate the efficacy of pre-anesthetic orally administration of clonidine on pulse rate and blood stress response to laryngoscopy and tracheal intubation. In a double-blinded, randomized study, 274 ASA I and II subjects with age of 18 to 45 years scheduled for elective surgery under general anesthesia were enrolled. They were randomly allocated to receive oral clonidine (0.2 mg) or placebo as premedication 90-120 min before surgery. All the patients received Succinylcholine (1.5 mg kg-1) after induction of anesthesia with Fentanyl (50 μg) and Thiopentone (5 mg kg-1). The anesthesia was maintained with halothane (1.5 Mac) in 50% mixture of N2O/O2. Heart rate and systolic blood pressure were recorded before, immediately after and then every 5 min after intubation until 20 min. The Clonidine group showed a significant superiority over placebo in the prevention of increase in systolic blood pressure as well as heart rate over the intubation. A significant difference was observed in both heart rate and systolic blood pressures were significantly higher in Control group at three subsequent measurements following intubation. The results of this study suggest that orally administered clonidine in preanesthetic period, provides more haemodynamic stability and attenuates the stress response to laryngoscopy and intubation.
  A. Nourozi , H. Talebi , S. Fateh , A. Mohammadzadeh , P. Eghtesadi-Araghi , Z. Ahmadi , A. Savarabadi and A. Mohebbi
  To determine the effect of adding ketamine to pethidine in reducing post-operative pain in patients undergoing major abdominal operations, in a double blind randomized controlled trial, 100 patients aged 15-60 years who were candidate for elective major abdominal surgery allocated into two groups of pethidine + ketamine group (5 mg pethidine and 0.25 mg kg-1 ketamine) or pethidine and placebo group (10 mg pethidine and NS) according to the regimen prescribed in postanesthesia care unit. Severity of pain (using visual analogue scale), prescribed dose of pethidine and side effects were recorded until 24 h after operation. Regarding post-operative pain, pethidine + ketamine group showed significant lower scores in all the times except 0 min, 2, 6 and 16 h. Nausea was significantly less frequent amongst pethidine + placebo group at times of 0, 15, 30 and 45 min (p<0.05). Comparison of two groups did not show significant differences in prescribed pethedine dose in 0, 9, 12, 16, 20 and 24 h (p>0.05). Yet, the mean dose of administered pethidine as rescue analgesic was significant lower in pethidine + ketamine group compared to pethidine + placebo group (112±31.5 mg vs. 133.5±24.5 mg, p<0.001). In conclusion, our results showed that co-administration of ketamine and pethidine in postanesthesia care unit will improve postoperative pain and reduce narcotic consumption. It may, however, increase rate of postoperative nausea in the first hour after operation.
 
 
 
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