heart rate turbulence


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heart rate turbulence

fluctuations of electrocardiographic cycle length after a ventricular premature contraction.
References in periodicals archive ?
HRV, heart rate variability; HRT, heart rate turbulence; BP, blood pressure; SDNN, standard deviation of NN intervals; SDANN, standard deviation of all 5- minute average NN intervals; rMSSD, square root of mean of the sum of squares of successive NN interval differences; pNN50, number of successive NN intervals differing by >50ms divided by the total number of successive NN intervals; VLF, very low frequency; LF, low frequency; HF, high frequency; TO, turbulence onset; TS, turbulence slope.
Cengel, "Heart rate variability and heart rate turbulence in patients with type 2 diabetes mellitus with versus without cardiac autonomic neuropathy," The American Journal of Cardiology, vol.
Heart Rate Turbulence: Turbulence onset (TO) was defined as the difference between the mean of the first two sinus RR intervals after a Ventricular premature beat (VPB) and the last two sinus RR intervals before the VPB divided by the mean value of the last two sinus RR intervals before the VPB.
Heart rate turbulence parameters were calculated using an algorithm adapted from the Web page popularizing the noncommercial use of HRT (http://www.h-r-t.org).
Stein speculates that this work and other studies showing the value of measuring heart rate turbulence may make the Holter software more widely available.
When the survival probability for the patients was calculated using heart rate turbulence, the differences were striking.
Some heart rate parameters such as heart rate turbulence and HRV are more useful in stratifying cardiovascular risk than in evaluating a given patient's clinical status (13, 14).
Heart rate turbulence parameters, turbulence onset (TO) and turbulence slope (TS) were calculated automatically by a computer program (HRT View, Version 0.60-0.1 Software Program, Munich, Germany).
Given this background future research directions need to include: (i) prospective long-term follow-up of non-dipper subgroups for target organ damage and arrhythmic outcomes both in normotensive and hypertensive groups, (ii) evaluate the involvement of noncardiovascular autonomic system in different patterns of circadian blood pressure, (iii) assess the relation of circadian blood pressure with autonomic indices, ventricular depolarization and repolarization processes with more sensitive methods like non-linear dynamics, heart rate turbulence, QT dynamicity, T wave alternans or fragmented QRS.