Changes in Skeletal Muscle Thickness in Patients With Acute Heart Failure

This study examines changes in muscle size and strength in patients who are critically ill with cardiogenic shock (a life-threatening condition where the heart can't pump enough blood). Researchers use bedside ultrasound to measure muscle thickness over time, aiming to understand how quickly muscles deteriorate and how interventions might help. **You may be eligible if...** - You are 18 or older - Your heart's pumping function (ejection fraction) is below 40% - You are in cardiogenic shock requiring at least one medication or mechanical device to support your heart or blood pressure - You are in an acute care hospital setting **You may NOT be eligible if...** - You have had a ventricular assist device (heart pump) implanted long-term - You have a condition known to cause muscle weakness (such as muscular dystrophy, active cancer, or a severe prior stroke) - You are on long-term tube or IV feeding - You are on a breathing machine or have previously had a heart transplant Talk to your doctor to see if this trial is right for you.