The absolute contraindications to defibrillation include the following: first, defibrillation is not recommended for arrhythmias caused by digitalis overdose; second, electrical defibrillation is not recommended for slow arrhythmias, including sick sinus node syndrome and sinus bradycardia; third, electrical defibrillation is not recommended for people with atrial fibrillation, atrial flutter, or atrial tachycardia in combination with high or complete atrioventricular block; fourth, electrical defibrillation is not recommended for people with severe electrolyte Fourth, people with severe electrolyte disorders, especially hypokalemia, are not recommended to be electrically defibrillated; Fifth, people with enlarged left atrium, history of atrial fibrillation for more than one year, and long-term slow ventricular rhythm are not recommended to be electrically defibrillated. Sixth, defibrillation should also be done with caution in patients with frailty, electrolyte disturbances, advanced age, and unclear heart rhythms, and such patients should not be defibrillated easily if they cannot cooperate with cardiac monitoring and intravenous access.