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| Colonic CT virtual endoscopy: research of the methods and atmospheric pressure for colon insufflation |
| MA Wei, ZHAO Gui-xin, FENG Yan-li, WANG Xiao |
| Chaoyang Second Hospital, Chaoyang Liaoning 122000, China |
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Abstract Objective: To explore the optimal methods and pressure for colon insufflation in computed tomographic colonography. Material and Methods: Eight volunteers(4 men, 4 women; mean age, 44.4 years; range, 40~50 years). Insufflation of the colon was performed using the machine(Compute Remote Controlling Enema Taxis Instrument) through catheter(double channel Foley balloon indwelling latex catheter). When people underwent CT colonography, we choose the highest pressure which did not cause undue people discomfort for the beginning pressure. We should hold the pressure until finishing the scanning. Then we reduced pressure for the other scanning. We reduced 7.5mmHg per time until the pressure is 30mmHg. Results: Double channel Foley balloon indwelling latex catheter is placed in the rectum. During scanning, air was insufflated under the same pressure which was kept to the end. Under different atmospheric pressure: 52.5mmHg, 40mmHg, 37.5mmHg, 30mmHg. The distensibility of colon did not have obvious difference. After scanning, the time when the discomfort of abdomen disappeared was obvious difference between the men’s and the women’s. Conclusions: During scanning, air was insufflated under the pressure which was hold to the end. The method can hold the stability of colon’s distensibility, and it make sure that the examination of CTVE is successful. The pressure of colon insufflation should not be according to the patient maximum tolerance. The pressure we chose was 30mmHg. We placed double channel Foley balloon indwelling latex catheter in the rectum. The gas bag of catheter can prevent the catheter from dislodging and reduce the air which went out between catheter and anus. After scanning, the time when the discomfort of abdomen disappeared was different. The women’s is longer than the men’s.
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Received: 18 April 2007
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2007, Vol. 18 
