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. 2013 Aug;8(8):1293-303.
doi: 10.2215/CJN.00750113. Epub 2013 May 9.

Cardiac resynchronization therapy in CKD: a systematic review

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Cardiac resynchronization therapy in CKD: a systematic review

Neha Garg et al. Clin J Am Soc Nephrol. 2013 Aug.

Abstract

Background: Cardiac resynchronization therapy (CRT) confers morbidity and mortality benefits to selected patients with heart failure. This systematic review examined effects of CRT in CKD patients (estimated GFR [eGFR] <60 ml/min per 1.73 m(2)).

Design, setting, participants, & measurements: MEDLINE and Scopus (from 1990 to December 2012) and conference proceedings abstracts were searched for relevant observational studies and randomized controlled trials (RCTs). Studies comparing the following outcomes were included: (1) CKD patients with and without CRT and (2) CKD patients with CRT to non-CKD patients with CRT. Mortality, eGFR, and left ventricular ejection fraction data were extracted and pooled when appropriate using a random-effects model.

Results: Eighteen studies (14 observational studies and 4 RCTs) were included. There was a modest improvement in eGFR with CRT among CKD patients (mean difference 2.30 ml/min per 1.73m(2); 95% confidence interval, 0.33 to 4.27). Similarly, there was a significant improvement in left ventricular ejection with CRT in CKD patients (mean difference 6.24%; 95% confidence interval, 3.46 to 9.07). Subgroup analysis of three RCTs reported lower rates of death or hospitalization for heart failure with CRT (versus other therapy) in the CKD population. Survival outcomes of CKD patients (compared with the non-CKD population) with CRT differed among observational studies and RCTs.

Conclusions: CRT improves left ventricular and renal function in the CKD population with heart failure. Given the increasing use of cardiac devices, further studies examining the effects of CRT on mortality in CKD patients, particularly those with advanced kidney disease, are warranted.

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Figures

Figure 1.
Figure 1.
Study flow diagram. Included studies and reasons for exclusion of studies.
Figure 2.
Figure 2.
Survival in CKD patients with CRT versus non-CKD patients with CRT (observational studies only). CRT, cardiac resynchronization therapy; 95% CI, 95% confidence interval.
Figure 3.
Figure 3.
Mean difference in eGFR after CRT in patients with baseline CKD. eGFR, estimated GFR; CRT, cardiac resynchronization therapy.
Figure 4.
Figure 4.
Effect of CRT on LVEF in those with CKD. CRT, cardiac resynchronization therapy; LVEF, left ventricular ejection fraction; 95% CI, 95% confidence interval.

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