Which condition is usually fatal unless immediately treated with CPR or an electrical shock to the heart?

Question

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Cardiac arrest is a condition where the heart suddenly stops beating, leading to a lack of oxygen supply to the body. It requires immediate treatment with CPR or defibrillation to shock the heart back into its normal rhythm. If left untreated, it can result in death within minutes. Heart attack (A), arrhythmia (B), and angina pectoris (D) may need medical attention but are not necessarily life-threatening emergencies that require immediate intervention with CPR or defibrillation.

Which Condition Is Usually Fatal Unless Immediately Treated with CPR