Abstract
Monitoring of BP is necessary for the care of sick NB. A simple, accurate, non invasive method for measuring BP almost continuously would be of great advantage and should reduce the frequency and duration of IA BP monitoring. In 18 critically ill NB, wgt: 840-3460gms.; Gest. Age: 28-42 wks, DX: RDS (13), PFC (2), Asphyxia (2), Sepsis (1),we compared the mean (M), Systolic (S) and Diastolic (D) BP recording from an automatic sphygomomanometer (Dinamap) to the simultaneous IA BP every 4 hours (n=279). Linear regression of peripheral vs. IA mean values (n=18) showed a significant correlation (MBP-r=.96; SBP-r=.96; DBP-r=.98) and slope not significantly different from 1. Average values of the mean differences between peripheral and IA BP were near zero (n=279; MBp=0.5; SBp=0.2; DBp=1.6). Analysis of variance of the individual peripheral - IA differences showed significant variability within and between patients (p<.001). Overall, the within patient variability (±SD) was 12, 16 and 13 torr for MBP, SBP and DBP respectively. Between patient variability was only slightly lower. In conclusion, when a series of measurements are made & averaged, the automatic sphygomomanometer correlates well with IA BP and could be useful for the longitudinal monitoring of sick NB. However, using only a few peripheral determinations could be misleading in estimating the IA BP, due to the large variability.
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