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Hypertension is the leading modifiable risk factor for global cardiovascular disease, responsible for an estimated 10.8 million deaths and more than 200 million disability-adjusted life years annually.1 Despite the availability of effective pharmacological and lifestyle interventions, prevalence continues to rise, particularly in low- and middle-income countries (LMICs), where over three-quarters of all cases now occur.2 The condition’s […]

Heart rate turbulence and variability in patients with ventricular arrhythmias

Federico Lombardi, Fabrizio Tundo, Abdalrahim Abukwaik, Diego Tarricone
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Published Online: Jul 27th 2018 Heart International 2007;3(1-2):51-7
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Abstract

Overview

Background. To evaluate the changes in autonomic neural control mechanisms before
malignant ventricular arrhythmias, we measured heart rate variability (HRV) and heart rate
turbulence (HRT) in patients with ventricular tachycardia or fibrillation (Group I; n=6), non sustained
ventricular tachycardia (Group II; n=32), frequent premature ventricular beats (Group III;
n=26) and with ICD implantation (Group IV; n=11).
Methods. Time domain parameters of HRV and turbulence onset (TO) and slope (TS) were calculated
on 24 hour Holter recordings. Normal values were: SDNN > 70 msec for HRV, TO <0% and TS >2.5 msec/RR-I for HRT.
Results. Whereas SDNN was within normal range and similar in all study groups, HRT parameters
were significantly different in patients who experienced VT/VF during Holter recording. Abnormal
TO and/or TS were present in 100% of Group I patients and only in about 50% of Group
II and IV. On the contrary, normal HRT parameters were present in 40-70% of Group II, III and IV
patients and none of Group I.
Conclusions. These data suggest that HRT analysis is more suitable than HRV to detect those
transient alterations in autonomic control mechanisms that are likely to play a major trigger role
in the genesis of malignant cardiac arrhythmias. (Heart International 2007; 3: 51-7)

Keywords

Sudden cardiac death, Autonomic nervous system, Risk stratification, Ventricular fibrillation, Holter recordings

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Article Information

Correspondence

Prof. Federico Lombardi, MD, FESC Cardiologia, Dipartimento di Medicina, Chirurgia e Odontoiatria, Osp. San Paolo, Università di Milano, Via A. di Rudinì, 8, 20142 Milano – Italy, Federico.Lombardi@unimi.it

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