Key result
Specific weather changes, such as decreased air temperature and increased wind speed, were associated with reduced heart rate variability in patients after open-heart surgery.
Why the study?
The study was conducted to detect the associations between heart rate variability and weather variables in patients who underwent coronary artery bypass grafting or valve surgery.
Do weather variables affect heart rate variability in patients after open-heart surgery?
Observational (n=220)
No
Do weather variables affect heart rate variability in patients after open-heart surgery?
Weather changes, specifically temperature, wind speed, and humidity, are associated with short-term alterations in heart rate variability in patients recovering from open-heart surgery.
Answers are grounded in this paper and cite their sources.
May indicate weather-related autonomic risk after cardiac surgery; leaves open prospective validation before clinical adoption.
The aim of the study was to detect the associations between heart rate variability (HRV) and weather variables in patients who underwent coronary artery bypass grafting or valve surgery. The study was performed in Kaunas, Lithuania, during 2008-2012. We used data of 220 patients. HRV was assessed by a 5-minute electrocardiogram. The data were collected at 1.5 months, 1 year, and 2 years after the surgery (495 measurements). A negative association of standard deviation of beat-to-beat interval (SDNN), very low frequency (VLF), low frequency, and high frequency (HF) powers with a decrease in air temperature (T) during a 3-day period in the range of T < 1°C wind speed >2.75 knots 2 days before, and the daily North Atlantic Oscillation indices were observed. The effect of wind speed on SDNN and VLF power was stronger in males. Two days after relative humidity >89%, a lower mean VLF and higher HF in normalized units were found; in females, this effect was stronger 1.5 months after the surgery. Among patients after open-heart surgery, the HRV variables may be related to specific weather changes and the effect of weather was different for males and females and at different times after the surgery.
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Venclovienė et al. (2022) conducted an observational in Post-open-heart surgery (coronary artery bypass grafting or valve surgery) (n=220). Weather variables (air temperature, wind speed, relative humidity) was evaluated on Heart rate variability (HRV) parameters including SDNN, VLF, LF, and HF. Specific weather changes, such as decreased air temperature and increased wind speed, were associated with reduced heart rate variability in patients after open-heart surgery.
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