Abstract
Spiky Burst of High Frequency Heart Rate Variability: A Prodromal Sign of Syncope Accompanying Heatstroke
Highlights
In recent years, as the temperature in summer rises with global warming, the risk of heatstroke during outdoor work and exercise is increasing [1], [2]
51 min before the onset of syncope, the amplitude of spikes increased to 20-30 ms and spiky HF bursts with SBR > 4.0 appeared at 51 min, 38 min, 20 min, and 6 min before the onset
Among 70 subjects in control group, 49 (70%) subjects showed no spiky HF burst for 24 h, 14 (20%) showed 1, and 7 (10%) showed multiple (2-6 times) spiky HF bursts
Summary
As the temperature in summer rises with global warming, the risk of heatstroke during outdoor work and exercise is increasing [1], [2]. We got an opportunity to analyze HRV in a case of accidental heatstroke occurring during golf playing under Holter electrocardiographic (ECG) monitoring. The data showed dynamic changes in HRV during the onset process of heatstroke leading syncope. Are specific to heatstroke by comparing the HRV data with those obtained on other days of exercise and golf playing without heatstroke symptom in the same subject and those in a healthy control group. CDM is a time domain method that provides the time dependent changes in amplitude and frequency of specified fluctuation components as the functions of time. We observed repetitive “spiky bursts” of the amplitude of HF component during the period preceding syncope accompanying heatstroke
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