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Acute hemodynamic effects of atrial pacing with cardiac resynchronization therapy.

Abstract：

BACKGROUND:Chronotropic incompetence is common among patients with advanced heart failure (HF), thus atrial pacing (AP) is frequently utilized in this population. The hemodynamic effects of AP during cardiac resynchronization therapy (CRT) have not been well studied. OBJECTIVE:The purpose of this study was to compare the acute hemodynamic response during CRT of AP with that during atrial sensing (AS). METHODS:This study included 26 patients undergoing CRT. At implant, invasive left ventricular (LV) dP/dt was measured by a micromanometer catheter during biventricular pacing in AS and AP modes at 5 different atrioventricluar delays (AVD), tested in randomized order. Postimplant, echocardiography was performed to obtain aortic and mitral flow velocity integrals at baseline (no CRT) and during CRT. RESULTS:Compared with intrinsic rhythm, CRT increased LV dP/dt by 11 +/- 11% during AS (heart rate: 74 +/- 13 bpm) and by 17 +/- 11% during AP (heart rate: 86 +/- 12 bpm, P < 0.001). The AVD associated with maximal hemodynamic response (AVD(max)) during AP was 72 +/- 40 ms longer than during AS. However, aortic and mitral flow velocity integrals decreased by 15-20% during AP. The aortic and mitral flow velocities at AVD(max) for LV dP/dt(max) were highly correlated with their maximum values (r > 0.98). CONCLUSION:AP increases LV dP/dt during CRT, but requires a substantially longer AV delay. However, AP results in modest reductions of LV filling and stoke volume. Further studies are needed to assess the long-term impact of AP on HF functional status and LV remodeling.

journal_name

J Cardiovasc Electrophysiol

journal_title

Journal of cardiovascular electrophysiology

authors

Gold MR,Niazi I,Giudici M,Leman RB,Sturdivant JL,Kim MH,Waggoner AD,Ding J,Arcot-Krishnamurthy S,Daum D,Yu Y

doi

10.1111/j.1540-8167.2009.01460.x

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

894-900

issue

8

eissn

1045-3873

issn

1540-8167

pii

JCE1460

journal_volume

20

pub_type

杂志文章

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