Systolisk blodtryk i hvile og under submaksimal og maksimal arbejdsbelastning på ergometercykel. Værdien af automatisk og auskultatorisk bestemmelse

Fifteen normal subjects participated in this comparison of systolic blood pressure measurement determined both automatically (AU) with the Kivex Ergometrics 900 and by the standard auscultatorically method (AM). Maximal exercise, was achieved by work performed on an electronically braked ergometer bicycle. In the first part of this study, simultaneous measurements of systolic blood pressure were made by the Kivex device and by the standard method at rest, every minute during exercise, and one minute after stopping exercise. The differences (two standard deviations) between AU and AM (n = 229) were +/- 19 mmHg at rest, +/- 15 mmHg at submaximal level, and +/- 49 mmHg at maximal exercise level. The acceptable difference was determined to +/- 15 mmHg by Bland and Altman. In the second part of this study, the differences between simultaneously measured auscultatoric systolic blood pressure by two observers (n = 205) was +/- 10 mmHg at rest, +/- 9 mmHg at submaximal level, and +/- 10 mmHg at the maximal exercise level. It can therefore be concluded that Kivex automatic blood pressure device, Ergometrics 900, is unable to measure accurately systolic blood pressure with sufficient agreement in normal subjects at the maximal stress level or at rest. However, at the submaximal exercise level, the Kivex device was able to measure systolic blood pressure with an acceptable agreement with the standard method. Therefore, the blood pressure results obtained by the Kivex device are highly influenced by the exercise level. The agreement between two observers using standard auscultatory method for systolic blood pressure measurement was found to be acceptable at all levels of exercise.