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Cardiovascular autonomic control in patients undergoing left ventricular assist device (LVAD) support and pharmacologic therapy

Nunan, D and Sandercock, GRH and George, RS and Jakovljevic, DG and Donovan, G and Bougard, R and Yacoub, MH and Brodie, DA and Birks, EJ (2013) 'Cardiovascular autonomic control in patients undergoing left ventricular assist device (LVAD) support and pharmacologic therapy.' International Journal of Cardiology, 168 (4). 4145 - 4149. ISSN 0167-5273

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Abstract

Objectives The objective of the study is to determine cardiac autonomic control in patients undergoing assessment for and/or LVAD therapy. Methods Heart rate variability (HRV) w as measured in 17 explanted LVAD, 17 implanted LVAD and 23 NYHA III-IV classified chronic heart failure (CHF) patients and ten healthy matched controls under three conditions: supine free breathing, standing and supine controlled breathing. Five measures of HRV were assessed: mean R-R interval (mR-R), high frequency (HF) and low frequency (LF) spectral power, LF in normalised units (LFnu), and LF to HF (LF:HF) ratio. Results Repeat measures ANOVA showed significant (p < 0.05) differences in HRV between all three conditions within groups. Lower values were observed in CHF for LF(in log natural units) compared with explanted patients (- 1.4 [95% CI - 2.6 to - 0.7], p = 0.04) and controls (- 2.1 [- 3.5 to - 0.7] , p = 0.001) and for LF:HF compared with implanted patients under paced breathing conditions (z = - 2.7, p = 0.007) and controls in standing (z = - 2.9, p = 0.004) and paced breathing conditions (z = - 2.3, p = 0.02). However, no significant differences were seen between explanted, implanted and control groups under any condition. Conclusions Patients implanted with an LVAD and explanted from a LVAD following myocardial recovery demonstrate a more normal dynamic response to autonomic stimuli and have a lower HRV risk profile compared to CHF patients. © 2013 Elsevier Ireland Ltd.

Item Type: Article
Subjects: R Medicine > R Medicine (General)
R Medicine > RD Surgery
Divisions: Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of
Depositing User: Gavin Sandercock
Date Deposited: 16 Sep 2013 08:35
Last Modified: 18 Oct 2017 07:15
URI: http://repository.essex.ac.uk/id/eprint/7729

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