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A shockable rhythm refers to specific abnormal heart rhythms that can be treated with an electrical shock, typically through a device like a defibrillator. These rhythms are potentially life-threatening but can be converted to a normal rhythm through defibrillation. The two primary shockable rhythms are:
Ventricular Fibrillation (VF): This is a chaotic, disorganized rhythm in which the ventricles (the heart's lower chambers) quiver ineffectively instead of contracting properly. This leads to a loss of cardiac output, meaning the heart is not pumping blood. VF is a common cause of sudden cardiac arrest and is highly responsive to defibrillation.
Pulseless Ventricular Tachycardia (pVT): This is a rapid heart rate originating from the ventricles that is so fast it prevents the heart from effectively pumping blood. In pVT, there is no palpable pulse, making it a life-threatening condition that requires immediate defibrillation.
Non-Shockable Rhythms:
It's important to note that some cardiac rhythms, such as asystole (flatline) and pulseless electrical activity (PEA), are not shockable. These require other interventions, such as CPR and medications, rather than defibrillation.
In the context of cardiac arrest, identifying whether a rhythm is shockable or non-shockable is critical, as it guides the appropriate emergency treatment.
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