a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble

a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles

medical instrument that records electric currents associated with contractions of the heart

electronic equipment that provides visual images of varying electrical quantities

a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles

medical instrument that records electric currents associated with contractions of the heart

electronic equipment that provides visual images of varying electrical quantities