An abnormal heart rhythm characterized by very rapid contractions of the ventricles that results in the inability of the heart to pump blood is

An abnormal heart rhythm characterized by very rapid contractions of the ventricles that results in the inability of the heart to pump blood is ventricular tachycardia.
Ventricular tachycardia is a heart rhythm disorder caused by abnormal electrical signals in the ventricles of the heart. This disorder causes the heart to beat faster than normal and as a consequence, the heart may not be able to pump enough blood to your body because the ventricles are beating so fast that they don't have time to fill properly.

Balkan nationalism increased tensions between austria and russia

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