An underwater ultrasound scan of scuba divers’ hearts found significant changes in cardiac function during and after a dive, according to a small study in the journal Acta Physiologica. The test could be used to identify novice scuba divers with undetected heart disease or cardiac abnormalities that might prove fatal during a dive, researchers said. (WSJ)

Cardiovascular changes during SCUBA diving: an underwater Doppler echocardiographic study