Mechanisms of Diuretic Resistance in Heart Failure, Aim 2

This study is investigating why some heart failure patients stop responding to water pills (diuretics) — a condition called diuretic resistance — by carefully measuring how their kidneys and body handle fluids. Understanding this could lead to better treatments for fluid buildup in heart failure. **You may be eligible if...** - You have been diagnosed with heart failure - Your heart failure medications are stable with no planned changes during the study - You have not had an unplanned hospital stay in the last 2 weeks - Your fluid levels are currently well-controlled - Your potassium blood level is within normal range **You may NOT be eligible if...** - Your heart failure treatment plan is being adjusted - You recently had an emergency hospitalization - You have unstable fluid levels or abnormal potassium Talk to your doctor to see if this trial is right for you.