Changes in cardiac function in Navy divers during four days of successive dives in very cold diving conditions

IF 1.3 4区医学 Q4 PHYSIOLOGY

Clinical Physiology and Functional Imaging Pub Date : 2023-02-09 DOI:10.1111/cpf.12814

Richard Lundell, Vesa Järvinen, Harri Mäkitalo, Kai Parkkola, Tomi Wuorimaa

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引用次数: 0

Abstract

Introduction and Methods

There is limited knowledge of cumulative effect of repetitive cold-water diving on cardiac function. Single cold dives cause some known cardiological risks, such as malign arrhythmia, due to a concurrent activation of the sympathetic and parasympathetic autonomic nervous system. A previous study from warmer water dives has shown that successive dives cause a decrease in vagal tone and a less responsive cardiovascular system. The aim of this study was to evaluate changes in cardiac function with 2D echocardiography during 4 days of diving in near-freezing water.

Results

Left ventricle systolic function measures did not show any uniform changes. E/A ratio seemed to decrease successively with the number of dives. The diastolic tissue velocity of relaxing basal septum (e′) showed a decreasing trend as well. Diastolic blood pressure seemed to increase from predive (mean: 83 RR mmHg) to postdive values (mean: 87 RR mmHg) (p=NS). Heart rate decreased significantly from predive (mean: 71 bpm, range: 56–103) to postdive values (mean: 60 bpm, range: 37–88) (p < 0.03).

Discussion and Conclusions

The study was conducted in very cold condition and with limited number of divers. Results of this preliminary study suggested a decreasing trend in left ventricular diastolic function in successive cold dives. Cumulative changes in cardiac function may cause health risks that need to be considered during cold water diving operations.

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海军潜水员在非常寒冷的潜水条件下连续4天潜水时心脏功能的变化

关于反复冷水潜水对心功能的累积影响，目前所知有限。由于同时激活交感和副交感自主神经系统，单次冷潜水会引起一些已知的心脏病风险，如恶性心律失常。先前一项关于温水潜水的研究表明，连续潜水会导致迷走神经张力下降，心血管系统反应减弱。本研究的目的是通过二维超声心动图评估在接近冰点的水中潜水4天期间心功能的变化。结果左心室收缩功能无明显变化。E/A比似乎随潜水次数的增加而依次降低。基底隔舒张组织速度(e′)也呈下降趋势。舒张压似乎从潜水前(平均:83 RR mmHg)增加到潜水后(平均:87 RR mmHg) (p=NS)。心率从潜水前(平均:71 bpm，范围:56-103)到潜水后(平均:60 bpm，范围:37-88)显著下降(p < 0.03)。讨论与结论本研究是在非常寒冷的条件下进行的，潜水员数量有限。本初步研究结果提示连续冷潜水后左室舒张功能有下降趋势。心功能的累积变化可能导致健康风险，这在冷水潜水操作中需要考虑。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Clinical Physiology and Functional Imaging 医学-生理学

CiteScore

3.40

自引率

5.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Clinical Physiology and Functional Imaging publishes reports on clinical and experimental research pertinent to human physiology in health and disease. The scope of the Journal is very broad, covering all aspects of the regulatory system in the cardiovascular, renal and pulmonary systems with special emphasis on methodological aspects. The focus for the journal is, however, work that has potential clinical relevance. The Journal also features review articles on recent front-line research within these fields of interest. Covered by the major abstracting services including Current Contents and Science Citation Index, Clinical Physiology and Functional Imaging plays an important role in providing effective and productive communication among clinical physiologists world-wide.