Much that was hoped for from the electrocardiograph in the clinic has not been forthcoming.
But the electrocardiograph was not needed to diagnose the nature of the trouble.
Then Jack took an electrocardiograph tracing and shook his head.
electrocardiograph e·lec·tro·car·di·o·graph (ĭ-lěk'trō-kär'dē-ə-grāf')
Abbr. ECG, EKG
An instrument used in the detection and diagnosis of heart abnormalities that measures electrical potentials on the body surface and generates a record of the electrical currents associated with heart muscle activity. Also called cardiograph.