Changes in sarcolemmal Ca entry and sarcoplasmic reticulum Ca content in ventricular myocytes from patients with end-stage heart failure following myocardial recovery after combined pharmacological and ventricular assist device therapy.

Abstract:

AIMS:Support with left ventricular assist devices (LVAD) improves cardiac performance in patients with end-stage heart failure. In some cases this strategy, combined with pharmacological treatment, has led to a clinical improvement which remained after LVAD explant. This study defines changes in Ca handling at the cellular level in failing left ventricular tissue taken at LVAD implant (LVAD core) and LVAD removal (post-LVAD). METHODS AND RESULTS:We studied cell size and Ca regulation in enzymatically dissociated cardiac myocytes. We used confocal microscopy and electrophysiological techniques to investigate the SR Ca content and major Ca movements across the sarcolemma during the action potential. We firstly recorded a significant reduction in cell capacitance and cell volume consistent with regression of cellular hypertrophy in post-LVAD myocytes compared with LVAD core myocytes. Ca entry via sarcolemmal Ca channels during the action potential using action potential voltage-clamping was significantly increased in post-LVAD myocytes compared with LVAD cores myocytes. Finally, SR Ca content (assessed by integrating the caffeine-induced Na/Ca exchanger transient inward current) in post-LVAD myocytes was also significantly increased compared with LVAD cores myocytes. CONCLUSIONS:These results show that in myocytes from patients after LVAD support there is more Ca entry to trigger Ca release and more SR Ca content, leading to improved contractile function.

journal_name

Eur Heart J

journal_title

European heart journal

authors

Terracciano CM,Harding SE,Adamson D,Koban M,Tansley P,Birks EJ,Barton PJ,Yacoub MH

doi

10.1016/s0195-668x(03)00242-2

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

1329-39

issue

14

eissn

0195-668X

issn

1522-9645

pii

S0195668X03002422

journal_volume

24

pub_type

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