TY - GEN
T1 - The influence of QRS width on the outcome of heart rate variability
AU - Haaksma, J
AU - Brouwer, J
AU - van den Berg, MP
AU - Dijk, WA
AU - Dassen, WRM
AU - Mulder, G
AU - Crijns, HJGM
PY - 1997
Y1 - 1997
N2 - Analysis of Heart Rate Variability (HRV) is used to assess autonomic control of the heart. Many technical aspects may influence the outcome of HRV analysis. One of these aspects is the accuracy of onset QRS detection. Inconsistent determination of QRS onset may result in artificial variations, especially in patients with wide QRS complexes. The purpose of the present study was to investigate the effect of QRS width on the outcome of HRV analysis. After manual correction of the onset of QRS, HRV variables averaged over 24 hours showed changes up to IO % in patients with wide QRS complexes. However, comparing single 5 minute segments before and after manual correction of onset QRS, much larger differences were observed Especially variables reflecting beat to beat changes (time as well as frequency domain) showed substantial differences. The average effect of manual QRS onset correction in single 5 minute segments proved to be 5.3% for rMSSD, 5.2% for high frequency power (0.15-0.40 Hz) and 1.3 % for low frequency power (0.04 - 0.15 Hz). We conclude that accurate detection of QRS onset plays an important role in the outcome of HRV analysis, especially in the analysis of short segments and patients with wide QRS complexes.
AB - Analysis of Heart Rate Variability (HRV) is used to assess autonomic control of the heart. Many technical aspects may influence the outcome of HRV analysis. One of these aspects is the accuracy of onset QRS detection. Inconsistent determination of QRS onset may result in artificial variations, especially in patients with wide QRS complexes. The purpose of the present study was to investigate the effect of QRS width on the outcome of HRV analysis. After manual correction of the onset of QRS, HRV variables averaged over 24 hours showed changes up to IO % in patients with wide QRS complexes. However, comparing single 5 minute segments before and after manual correction of onset QRS, much larger differences were observed Especially variables reflecting beat to beat changes (time as well as frequency domain) showed substantial differences. The average effect of manual QRS onset correction in single 5 minute segments proved to be 5.3% for rMSSD, 5.2% for high frequency power (0.15-0.40 Hz) and 1.3 % for low frequency power (0.04 - 0.15 Hz). We conclude that accurate detection of QRS onset plays an important role in the outcome of HRV analysis, especially in the analysis of short segments and patients with wide QRS complexes.
M3 - Conference contribution
SN - 0-7803-4446-4
T3 - COMPUTERS IN CARDIOLOGY
SP - 129
EP - 132
BT - COMPUTERS IN CARDIOLOGY 1997, VOL 24
PB - IEEE (The Institute of Electrical and Electronics Engineers)
CY - NEW YORK
T2 - 24th Annual Computers in Cardiology Conference
Y2 - 7 September 1997 through 10 September 1997
ER -