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فیبریلاسیون بطنی
VF Treated With CPR and Automated External Defibrillator 47
Cardiac Arrest Rhythms and Conditions The ECG rhythms/conditions for patients who are in cardiac arrest are ventricular fibrillation (VF; Figure 16A and B), pulseless ventricular tachycardia (VT), asystole (Figure 17), or pulseless electrical activity (PEA), which presents with a variety of rhythms.
Ventricular Fibrillation Pathophysiology * Ventricles consist of areas of normal myocardium alternating with areas of ischemic, injured, or infarcted myocardium, leading to a chaotic asynchronous pattern of ventricular depolarization and repolarization.
* Amplitude: Measured from peak to trough; often used subjectively to describe VF as fine (peak to trough 2 to 15 mm) Clinical Manifestations * Pulse disappears with onset of VF
- The pulse may disappear before the onset of VF if a common precursor to VF, rapid VT, develops before the VF.
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