Abstract
Background
Chronotropic incompetence (CI) is an independent predictor of cardiovascular events and overall mortality. The prevalence and significance of CI in renal transplant patient has not been examined.
Methods
38 non-heart failure renal transplant recipients were recruited for a transthoracic echocardiogram and treadmill stress test using the modified Bruce protocol.
Results
15 patients (39.5 %) had CI (defined as failure to reach 85 % of the maximum age-predicted heart rate, or <8 0 % of predicted heart rate reserve). CI patients had higher left ventricular (LV) mass (216.5 ± 56.1 vs. 183.1 ± 40.0 g, p = 0.04), increased septal wall thickness (11.7 ± 1.4 vs. 10.7 ± 1.1 mm, p = 0.03) and posterior wall thickness (10.9 ± 1.9 vs. 9.5 ± 1.7 mm, p = 0.02). At multivariate analysis, CI was associated with elevated serum creatinine [odds ratio (OR) 1.04, p = 0.03] and increased LV mass (OR 1.03, p = 0.03). CI was associated with shorter exercise duration (3.53 ± 2.20 vs. 8.08 ± 2.34 min, p < 0.01) and lower metabolic equivalents (5.40 ± 2.05 vs. 9.82 ± 2.39, p < 0.01). At multivariate analysis, exercise duration was negatively associated with CI (β = −0.54, p < 0.01).
Conclusions
CI is present in approximately 40 % of asymptomatic renal transplant recipients and is associated with reduced exercise tolerance, left ventricular hypertrophy, and worse allograft function .
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest. Institutional Review Board (IRB)/Ethics Committee approval has been obtained. This study was in adherence with the Declaration of Helsinki and 1. informed consent was obtained from all participants. This study was conducted in adherence to the Declaration of Istanbul.
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HKClinicalTrials.com number: HKCTR-1152.
“Maggie Kam Man Ma and Ming Lang Zuo” and “David Chung Wah Siu and Tak Mao Chan” have contributed equally to this work.
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Ma, M.K.M., Zuo, M.L., Yap, D.Y.H. et al. Chronotropic incompetence, echocardiographic abnormalities and exercise intolerance in renal transplant recipients. J Nephrol 27, 451–456 (2014). https://doi.org/10.1007/s40620-014-0091-y
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DOI: https://doi.org/10.1007/s40620-014-0091-y