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- Early direct current (DC) shock defibrillation is most important for successful resuscitation of an adult patient with out-of-hospital cardiac arrest
- One French unit (F), a measurement of catheter diameter, is equivalent to 0.33mm
- Dual-chamber pacemaker for sinus node dysfunction+heart failure+dilated left ventricle with severe global LV systolic dysfunction - decrease the percentage of RV pacing by pacemaker interrogation
- ETT ST-segment depressions probability of diagnosing signicant coronary artery disease increases with normal baseline ECG without LBBB, LVH,WPW, digoxin effect
- STEMI, ostial occlusion of dominant RCA, bradycardia, hypotension, abnormal heart rate and blood pressure are likely a consequence of vagal stimulation. Dominant RCA supplies inferoposterior left ventricle where cardiac vagal afferent fibers are prominent
- Shocks from ICD without any arrhythmias, most appropriate initial step is to place a “donut” magnet over ICD site
- Exertional dyspnea, fatigue, sudden lightheadedness+cardiopulmonary exercise testing failure to reach 80% maximum predicted HR with exercise - chronotropic incompetence, which is one manifestation of sinus node dysfunction
- CAD + LVEF below 35% + nonsustained VT - ICD is indicated if EP study shows inducible VT