Dehydration and heart health are closely related. Low water intake can increase the future risk of cardiovascular conditions. Acute hypohydration can impair blood pressure regulation and vascular function. When blood pressure levels drop, sodium level in the blood increases, thickening the blood and making it difficult to circulate throughout the body. Therefore, the heart muscles have to work harder to pump out blood. Frequent fluctuations in fluid levels in the heart chamber can disturb the heart beat rhythm, especially in individuals with heart issues, such as arrhythmia (irregular heart beat). Conditions like coronary artery disease or congestive heart failure can also lower blood pressure levels. Therefore, staying hydrated at all times is important.
Sources –
https://health.clevelandclinic.org/dehydration-and-blood-pressure
https://www.healthline.com/health/dehydration-and-blood-pressure
https://www.healthline.com/health/can-dehydration-cause-vertigo
https://www.westsidemedatl.com/blog/can-dehydration-cause-high-blood-pressure-and-other-dehydration-faqs#:~:text=Dehydration%20can%20cause%20high%20blood%20pressure%20(hypertension)%20in%20some%20cases,body%2C%20which%20increases%20blood%20pressure