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Liu Z, Yang J, Yang B, Sun M, Ye X, Yu S, Tan H, Hu M, Lv H, Wu B, Gao X, Huang L. Effect of ubiquinol on electrophysiology during high-altitude acclimatization and de-acclimatization: A substudy of the Shigatse CARdiorespiratory fitness (SCARF) randomized clinical trial. Int J Cardiol 2024; 401:131817. [PMID: 38307422 DOI: 10.1016/j.ijcard.2024.131817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/26/2024] [Accepted: 01/28/2024] [Indexed: 02/04/2024]
Abstract
BACKGROUND High-altitude exposure changes the electrical conduction of the heart. However, reports on electrocardiogram (ECG) characteristics and potent prophylactic agents during high-altitude acclimatization and de-acclimatization are inadequate. This study aimed to investigate the effects of ubiquinol on electrophysiology after high-altitude hypoxia and reoxygenation. METHODS The study was a prospective, randomized, double-blind, placebo-controlled trial. Forty-one participants were randomly divided into two groups receiving ubiquinol 200 mg daily or placebo orally 14 days before flying to high altitude (3900 m) until the end of the study. Cardiopulmonary exercise testing was performed at baseline (300 m), on the third day after reaching high altitude, and on the seventh day after returning to baseline. RESULTS Acute high-altitude exposure prolonged resting ventricular repolarization, represented by increased corrected QT interval (455.9 ± 23.4 vs. 427.1 ± 19.1 ms, P < 0.001) and corrected Tpeak-Tend interval (155.5 ± 27.4 vs. 125.3 ± 21.1 ms, P < 0.001), which recovered after returning to low altitude. Ubiquinol supplementation shortened the hypoxia-induced extended Tpeak-Tend interval (-7.7 ms, [95% confidence interval (CI), -13.8 to -1.6], P = 0.014), Tpeak-Tend /QT interval (-0.014 [95% CI, -0.027 to -0.002], P = 0.028), and reserved maximal heart rate (11.9 bpm [95% CI, 3.2 to 20.6], P = 0.013) during exercise at high altitude. Furthermore, the decreased resting amplitude of the ST-segment in the V3 lead was correlated with decreased peak oxygen pulse (R = 0.713, P < 0.001) and maximum oxygen consumption (R = 0.595, P < 0.001). CONCLUSIONS Our results illustrated the electrophysiology changes during high-altitude acclimatization and de-acclimatization. Similarly, ubiquinol supplementation shortened the prolonged Tpeak-Tend interval and reserved maximal heart rate during exercise at high altitude. REGISTRATION URL: www.chictr.org.cn; Unique identifier: ChiCTR2200059900.
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Affiliation(s)
- Zhen Liu
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Jie Yang
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Bingjie Yang
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Mengjia Sun
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Xiaowei Ye
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Shiyong Yu
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Hu Tan
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Mingdong Hu
- Department of Physical Examination, the Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Hailin Lv
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Boji Wu
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Xubin Gao
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China
| | - Lan Huang
- Institute of Cardiovascular Diseases of PLA, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, China; Department of Cardiology, The Second Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, PR China.
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