Hs and Ts (elaborated)

A lack of circulating body fluids, principally blood volume.

A lack of oxygen delivery to the heart, brain and other vital organs.

An abnormal pH in the body as a result of lactic acidosis.

excess potassium and inadequate potassium

A low core body temperature, defined clinically as a temperature of less than 35 degreesCelsius (95 degrees Fahrenheit.)

Tricyclic antidepressants, phenothiazines, beta blockers, calcium channel blockers, cocaine, digoxin, aspirin, paracetamol/acetominophen.

Blood or other fluids building up in the pericardium can put pressure on the heart so that it is not able to beat.

The build-up of air into one of the pleural cavities, which causes a mediastinal shift.

Coagulation or clotting of the blood in a part of the circulatory system.

Obstruction of a blood vessel by a blood clot that has become dislodged from another site in the circulation.

Sufficient structural damage that could induce arrest.