Correlation of heart rate variability and average heart rate within 24 hours in elderly inpa-tients
WANG Xue-ling
LI Ze-hua
DUAN Yong-li
Abstract：Objective To explore the correlations of the time-domain indexes with the frequency-domain indexes and the average heart rate within 24 hours in elderly inpatients.Methods A total of 187 elderly patients (n=187) admitted from Jul. 2014 to Feb. 2016 in Beijing Hospital of Integrated Traditional Chinese and Western Medicine were chosen. The ambulatory electrocardiography data was retrospectively analyzed. According to Standard Deviation of Normal to Normal (SDNN), all subjects were divided into group A (n=91) with normal Heart Rate Variability (HRV), group B (n=66) with moderately decreased HRV, and group C (n=30) with severely decreased HRV. The frequency-domain indexes were divided into three levels: declined, normal, and elevated. The time-domain indexes, the frequency-domain indexes and the average heart rate within 24 hours were analyzed among the three groups.Results As SDNN decreased, Standard Deviation of Sequential Five-Minute R-R Interval Means (SDANN), SDNN Index, Root Mean Square of the Successive Differences (RMSSD), PNN50 (a measure of the number of adjacent NN intervals which differ by more than 50 ms), SDNN in the daytime, SDNN in the night and TP gradually declined from group A to group C (P<0.01). The average heart rate within 24 hours gradually increased from group A to group C (P<0.01). In group A, normal low frequency (LF) accounted for the highest proportion (P<0.01, compared with group B and C), while declined LF accounted for the highest proportion in both group B and group C (P>0.05). Increased high frequency (HF) accounts for the highest proportion in group A, declined HF accounted for half in group B, and in group C declined HF accounted for the highest proportion. The distinctions of HF among the three groups were significant respectively (P<0.01). SDNN was negatively correlated with the average heart rate within 24 hours, γs=- 0.42 (P<0.01). SDNN was positively correlated with total power (TP), γs=0.56. (P<0.01).Conclusion SDNN was negatively correlated with the average heart rate within 24 hours and positively correlated with TP in elderly inpatients.
Keywords：Ambulatory electrocardiographyHeart rate variabilityElderly inpatients
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 50-52 )