One in five people worldwide run the risk of developing congestive heart failure (lat. cor defectum), and this prevalence increases with age. As there is no cure for the ailment, patients can only monitor their health closely with lifestyle changes or medication to prevent their heart function from deteriorating irreversibly. Therefore, a research team from Nanyang Technological University, Singapore (NTU Singapore) and Tan Tock Seng Hospital (TTSH) have invented a smart handheld medical device that could enable early intervention for patients with congestive heart failure. The portable innovation, which resembles a stethoscope, is made up of an acoustic sensor connected to a smartphone that uses vocal digital biomarkers. It enables early intervention by allowing patients to check for excess fluid in the lungs at home. Fluid accumulation in the lungs, which causes breathlessness, is a common symptom of congestive heart failure.