BackgroundBlood pressure (BP) variability can be evaluated by 24-hour ambulatory BP
monitoring (24h-ABPM), but its concordance with results from finger BP
measurement (FBPM) has not been established yet.ObjectiveThe aim of this study was to compare parameters of short-term (24h-ABPM) with
very short-term BP variability (FBPM) in healthy (C) and
diabetic-hypertensive (DH) subjects.MethodsCross-sectional study with 51 DH subjects and 12 C subjects who underwent
24h-ABPM [extracting time-rate, standard deviation (SD), coefficient of
variation (CV)] and short-term beat-to-beat recording at rest and after
standing-up maneuvers [FBPM, extracting BP and heart rate (HR) variability
parameters in the frequency domain, autoregressive spectral analysis].
Spearman correlation coefficient was used to correlate BP and HR variability
parameters obtained from both FBPM and 24h-ABPM (divided into daytime,
nighttime, and total). Statistical significance was set at p < 0.05.ResultsThere was a circadian variation of BP levels in C and DH groups; systolic BP
and time-rate were higher in DH subjects in all periods evaluated. In C
subjects, high positive correlations were shown between time-rate index
(24h-ABPM) and LF component of short-term variability (FBPM, total, R =
0.591, p = 0.043); standard deviation (24h-ABPM) with LF component BPV
(FBPM, total, R = 0.608, p = 0.036), coefficient of variation (24h-ABPM)
with total BPV (FBPM, daytime, -0.585, p = 0.046) and alpha index (FBPM,
daytime, -0.592, p = 0.043), time rate (24h-ABPM) and delta LF/HF (FBPM,
total, R = 0.636, p = 0.026; daytime R = 0,857, p < 0.001). Records
obtained from DH showed weak positive correlations.Conclusions Indices obtained from 24h-ABPM (total, daytime) reflect BP and HR
variability evaluated by FBPM in healthy individuals. This does not apply
for DH subjects.