What are triggers for expression of cardiac arrest?

Alteration of coronary blood flow (ischemia, reperfusion after ischemia) Low CO (heart failure (chronic or acute decomp), shock) Systemic metabolic abnormality (electrolyte imbalace hypokalemia, hypoxemia, acidosis) Neurodisturbance (fluctuations (central/ humoral), receptor function) Toxic response (proarrhythmic drugs, cardiac toxins like cocaine, drug interactions)