Which procedure involves an electrical shock delivered randomly during the cardiac cycle to treat emergent, life-threatening arrhythmias? Cardioversion Defibrillation ICD placement Stent placement Catheterization
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In the past, an irregular heart rhythm was treated by using a drug to help regulate the beat. There is a treatment that can also regulate heart rhythms that has replaced drugs in some cases. What is that treatment? pacemaker angioplasty clot-dissolving drugs myocardial infarction
Adi S.
Madhur L.
The immediate cause of many deaths is ventricular fibrillation, uncoordinated quivering of the heart as opposed to proper beating. An electric shock to the chest can cause momentary paralysis of the heart muscle, after which the heart will sometimes start organized beating again. A defibrillator (Fig. 26.14 ) is a device that applies a strong electric shock to the chest over a time interval of a few milliseconds. The device contains a capacitor of several microfarads, charged to several thousand volts. Electrodes called paddles, about $8 \mathrm{cm}$ across and coated with conducting paste, are held against the chest on both sides of the heart. Their handles are insulated to prevent injury to the operator, who calls, "Clear!" and pushes a button on one paddle to discharge the capacitor through the patient's chest. Assume that an energy of $300 \mathrm{J}$ is to be delivered from a $30.0-\mu \mathrm{F}$ capacitor. To what potential difference must it be charged?
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