Reduced need for sedation in patients undergoing helical CT of the chest and abdomen.

Since 15 July 1993, we have used helical CT exclusively in chest and abdomen exams. The purpose of this study was to compare sedation rates in children undergoing conventional and helical CT of the chest and abdomen. Data for all CT examinations of the head (n = 1121), chest (n = 427), and abdomen (n = 315) performed between 1 April 1993 and 31 October 1993 were evaluated. Examinations were divided by anatomic site, patient age, date, whether motion was noted in the radiology report, and whether or not sedation was used. The oldest patient requiring sedation was 5 years old. All examinations in patients 5 years old or less (n = 1048) formed the study group. Because no head CT examinations were done helically, this constituted a control group. Comparisons of motion and sedation rates before and after 15 July 1993 were made with the chi 2 test. There was no statistically significant difference in the sedation rate in the control group (patients having conventional head CT examinations). In contrast, the use of helical technique for chest and abdomen CT coincided with a reduction of the sedation rate from 18% to 10% (P = 0.3). There was no statistically significant difference in reported motion for either head or chest/abdomen examinations over the study period. The implementation of helical CT coincided with a 45% reduction in the sedation rate of patients undergoing CT of the chest and abdomen. At the current volume of CT examinations at our institution, this decrease would result in an estimated 60 fewer sedations per year.