Heart failure clue: blood test may forecast therapy success

This study looks at whether a substance called YKL-40 in the blood can help predict how well heart failure patients will respond to cardiac resynchronization therapy (CRT), a special pacemaker. About 51 adults with severe heart failure will have blood samples taken during their routine CRT procedure. Researchers will then check their heart function 6 months later to see if YKL-40 levels are linked to improvement. The goal is to find a simple way to identify who will benefit most from CRT.