Any one of the conductors, composed of two or more electrodes, in the ECG that shows the electrical conduction in the heart.
A fall in blood pressure when changing to an erect position.
Having one common shape of QRS complex.
The effect on the rate of contraction of the heart.
The blood vessels that carry blood to the heart.
Tissue anoxia from diminished blood flow to tissue, usually caused by narrowing or occlusion of the artery.
A cardiac dysrhythmia seen just before the heart stops altogether; essentially asystole with occasional QRS complexes that are not associated with cardiac output.
A slow heart rate, less than 60 beats/min.
The pressure under which the ventricle fills.
The period from one cardiac contraction to the next. Each cardiac cycle consists of ventricular contraction (systole) and relaxation ( diastole).
The baseline of the ECG.
The effect on the velocity of conduction.
The upper left chamber of the heart; receives blood from the pulmonary veins.
A system of fibers in the ventricles that conducts the excitation impulse from the bundle branches to the myocardium.
The pressure exerted by the pulsatile flow of blood against the arterial walls.
The flow of blood from the right ventricle through the pulmonary arteries and all of their branches and capillaries in the lungs and back to the left atrium through the venules and pulmonary veins; also called the lesser circulation.
The early phase of cardiac repolarization, wherein the heart muscle cannot be stimulated to depolarize.