Can dehydration head to congestive heart disappointment?
Another thought. Dehydration causes pre-renal azotemia and results surrounded by acute renal failure, cause your electrolytes to get out of whack. Hyperkalemia (especially prompted if you are taking potassium supplements and ACE inhibitors) can prompt cardiac arrhythmias, precipitating heart dud (or even death). I hope this helps. Good luck.
