Implications of turbulence slope variations in different approaches
Abstract
Overview
Both heart rate variability (HRV) and heart
rate turbulence (HRT) are established tools to
study cardiac autonomic activity. Short-term
studies of HRV had been reported to be stable
for autonomic function assessment. However,
there is little information on whether shortterm
HRT assessment is comparable to 24 h
assessment. The aim of the study is to identify
the relationship of HRT values between the 24
h and isolated tachogram measurements. We
collected 24 h Holter recordings from 116
patients attending the outpatient department.
HRT parameters were assessed for 24 h. Using
the conventional method, HRT parameters
were calculated using the average of
tachograms over long-term recordings. In an
alternative method, HRT parameters were
obtained from each tachogram. We calculated a
mean value for each subject by averaging the
whole HRT data of every tachogram.
Correlation analysis between the two groups of
HRT values was performed. The results showed
a high correlation between the two methods in
turbulence slope (TS) (P<0.001; r=0.84) and
an extremely significant correlation in turbulence
onset (TO) (P<0.001; r=0.99). The values
of TS were increased when assessed by separate
tachogram. The variations became prominent
when TS values calculated by the conventional
method were low. HRT is as useful by
separate tachogram assessment as by the standard
Holter recordings. However, the TS values
should be redefined. In subjects with abnormal
turbulence slope (<2.5) calculated by averaging
long-term recordings, the possibility of TS values
blunted by diverse regression slope
sequences in separate tachograms should be
taken into consideration.
Keywords
Heart rate turbulence, turbulence slope, turbulence slope curve.
Article Information
Correspondence
H.Y. Chen, Department of Cardiology, Taipei City Hospital-Heping Branch, No. 33, Sec. 2, Zhonghua Rd., Taipei City 100, Taiwan. Tel. 886.223889595 ext 8001. E-mail: anigi426@ms24.hinet.net; dae28@tpech.gov.tw
Received
2011-05-21T00:00:00
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