International Journal of Medical Sciences

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13 November 2018

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Int J Med Sci 2018; 15(2):108-114. doi:10.7150/ijms.21956

Research Paper

Left ventricular diastolic and systolic dyssynchrony and dysfunction in heart failure with preserved ejection fraction and a narrow QRS complex

Shuang Liu1, Zhengyu Guan1, Xuanyi Jin2, Pingping Meng1, Yonghuai Wang1, Xianfeng Zheng3, Dalin Jia3, Chunyan Ma1✉, Jun Yang1

1. Department of Cardiovascular Ultrasound, The First Hospital of China Medical University, Shenyang, Liaoning, People's Republic of China, 110001;
2. Department of Cardiology, Mayo Clinic (Arizona), Scottsdale, Arizona, United States, 85259;
3. Department of Cardiology, The First Hospital of China Medical University, Shenyang, Liaoning, People's Republic of China.

Abstract

Aims: Mechanical dyssynchrony has been reported in heart failure with preserved ejection fraction (HFpEF), with a majority of patients having a narrow QRS complex; however, whether any benefit is observed with restoration of dyssynchrony remains unclear. We sought to assess left ventricular (LV) dyssynchrony and function in HFpEF and elucidate the underlying mechanisms that may account for HFpEF.

Methods: Seventy-eighty patients with a narrow QRS complex including 47 with HFpEF, 31 with heart failure with reduced ejection fraction (HFrEF) patients, and 29 with asymptomatic left ventricular diastolic dysfunction (LVDD) were recruited. Forty-five normal subjects acted as controls. Systolic LV longitudinal strain (LS), systolic longitudinal strain rate (LSrS), early diastolic longitudinal strain rate (LSrE), and late diastolic longitudinal strain rate (LSrA) were measured using speckle tracking echocardiography. LV diastolic and systolic dyssynchrony (Te-SD and Ts-SD) were calculated.

Results: Te-SD and Ts-SD were prolonged in HFpEF and HFrEF patients than in the control group (p<0.05). However, Ts-SD was shorter in HFpEF patients compared to HFrEF patients despite a narrow QRS complex (p<0.05). LV global LS, LSrS, and LSrE were decreased in patients with HFpEF and HFrEF compared to other groups, with HFrEF being even more reduced than HFpEF (p<0.05). Reduced LS, LSrS, and LSrE could effectively differentiate HF from asymptomatic LVDD patients (p<0.05).

Conclusion: HFrEF exhibited increased systolic dyssynchrony compared to HFpEF despite a narrow QRS complex in addition to the more reduced diastolic and systolic function. Therefore, targeting to improve diastolic and systolic function instead of managing systolic dyssynchrony might be of great importance in the treatment of HFpEF.

Keywords: Dyssynchrony, Heart failure with preserved ejection fraction, Narrow QRS complex, Speckle tracking echocardiography.

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How to cite this article:
Liu S, Guan Z, Jin X, Meng P, Wang Y, Zheng X, Jia D, Ma C, Yang J. Left ventricular diastolic and systolic dyssynchrony and dysfunction in heart failure with preserved ejection fraction and a narrow QRS complex. Int J Med Sci 2018; 15(2):108-114. doi:10.7150/ijms.21956. Available from http://www.medsci.org/v15p0108.htm