Abstract:
AIMS:LV reverse remodelling has been shown to be a favourable response after cardiac resynchronization therapy (CRT) in many clinical trials. This study investigated whether left ventricular (LV) reverse remodelling after CRT has any structural benefit, which include the improvement of LV mass or regional wall thickness. METHODS AND RESULTS:Fifty patients (66 +/- 11 years) receiving CRT were followed up for at least 3 months. Echocardiography with tissue Doppler imaging was performed serially before and at day 1 and 3 months after CRT. Although LV end-systolic volume (LVESV) was decreased at day 1 after CRT (141 +/- 74 vs. 129 +/- 71 cm(3), P < 0.001), further LV reverse remodelling was observed at 3 months (110 +/- 67 cm(3), P < 0.001 vs. day 1). LV ejection fraction increased at day 1 (26.5 +/- 9.3 vs. 28.5 +/- 9.1%, P < 0.005) and was further improved at 3 months (34.2 +/- 10.5%, P < 0.001 vs. day 1). However, reduction of LV mass (231 +/- 67 vs. 213 +/- 59 g, P < 0.001) and regional wall thickness was only observed at 3 months, but not at day 1. The improvement of LV mass correlated with the change in LVESV (r = 0.66, P < 0.001) and the baseline systolic asynchrony index (Ts-SD) (r = -0.52, P < 0.001). LV mass was only decreased significantly in responders of LV reverse remodelling (245 +/- 66 vs. 207 +/- 61 g, P < 0.001), but increased in non-responders (209 +/- 64 vs. 223 +/- 56 g, P = 0.02). Responders had significant decrease in thickness of all the four walls for -6 to -11% (all P < or =0.02), whereas non-responders had increased thickness in septal and lateral walls for +11% (both P < 0.05). CONCLUSION:The acute reduction in LV volume after CRT is mediated by haemodynamic and geometric benefits without actual changes in LV mass. However, at 3-month follow-up, reduction in LV mass and regional wall thickness was demonstrated, which represents structural reverse remodelling. Such benefit was only observed in volumetric responders but was worsened in non-responders.
journal_name
Eur Heart Jjournal_title
European heart journalauthors
Zhang Q,Fung JW,Auricchio A,Chan JY,Kum LC,Wu LW,Yu CMdoi
10.1093/eurheartj/ehi885subject
Has Abstractpub_date
2006-06-01 00:00:00pages
1423-30issue
12eissn
0195-668Xissn
1522-9645pii
ehi885journal_volume
27pub_type
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