Showing 2 results for Carbon Dioxide
Ebrahim Hassani , Rasoul Farasatkish , Evaz Heydarpour , Mohammadzia Totoonchi , Alireza Mahoori ,
Volume 67, Issue 9 (12-2009)
Abstract
Background: Measuring end tidal carbon dioxide (ETCo2) is one of the methods used for estimating arterial carbon dioxide (PaCo2) during general anesthesia. ETCo2 measurements maybe obviate the need for repeating arterial puncture for determination of arterial PaCo2. This study performed to determine the accuracy of ETCo2 levels as a measure of PaCo2 levels in patients undergoing coronary artery bypass graft and also to evaluate variation of the gradient between PaCo2 and ETCo2, peri- cardiopulmonary bypass operation. Methods: In a prospective, cross-sectional study, a total of 40 patients with age 57±11 (35-73) years old undergoing coronary artery bypass graft were enrolled. ETCo2 levels (mmHg) were recorded using side stream capnography at the time of arterial blood gas sampling, before (T0) and after (T1) cardiopulmonary bypass. Results: Mean P(a-ET)Co2 at T0 was 4.3±4.4mmHg, with the mean PaCo2, 33±6mmHg and mean ETCo2, 29±5mmHg and these values at T1 were 4.5±4.1mmHg, 33±5mmHg and 29±2mmHg respectively. There was no variation of the mean gradient (PaCo2-PETCo2) during, before and after cardiopulmonary bypass (p>0.870). Significant correlation was found between ETCo2 and PaCo2 at T0 and T1 (r=0.754 and 0.685respectively and p=0.001). Conclusion: Capnography is a non- invasive and a safe technique for determining arterial PCo2 and for measurements of ETCo2 that correlate well with PaCo2 values in healthy patients undergoing coronary artery bypass graft. ETCo2 measurements maybe sufficient measures of PaCo2 in selected patients and obviate the need for repeatingarterial blood gas determination. Further study is warranted.
Ali Zahedian, Mohsen Shoja , Hadi Mollazade, Masoomeh Taiebi ,
Volume 72, Issue 2 (5-2014)
Abstract
Background: Laparoscopic cholecystectomy is a way of removing the gallbladder. But like other surgeries, this procedure has some side effects such as postoperative shoulder pain. This study evaluates the effect of different gas flow rates into the abdominal cavity on postoperative shoulder pain in laparoscopic cholecystectomy patients.
Methods: The study as a randomized clinical trial was conducted on laparoscopic chol-ecystectomy patients in Imam Khomeini Hospital- Esfarayen 2011-2012. One hun-dred participants were selected by available sampling, and were divided randomly into two groups of 50 patients. In group I flow rate of CO2 gas was two liters per minute and in group II flow rate of CO2 gas was five liters per minute. After reversing anesthe-sia, six, 12 and 24 hours post operative, shoulder pain was evaluated by Visual Ana-logue Scale (VAS) pain questionnaire. The study findings analyzed by independent t-test.
Results: The mean age of participants was 48.8±7.5 years and mean surgery duration was 36.5±13.1 minutes, and there was no significant differences between two groups (P>0/05). However, the mean shoulder pain scores in group I (blowing with low pres-sure) was differed significantly with group II (blowing with high pressure) (P<0.05). In group I, pain was lower than group II.
Conclusion: Results showed if CO2 gas flow rate is two liters per minute (blowing with low pressure), the patients complain less shoulder pain. Therefore low pressure gas in-sufflation for laparoscopic surgery is recommended. Further studies in this field should be considered.
