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Published byGrace Hutchinson Modified over 9 years ago
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A premature ventricular complex (PVC) arises from an irritable table site within either ventricle. A full compensatory pause often follows a PVC. A fusion beat is a result of an electrical impulse from a supraventricular site (such as the SA node) discharging at the same time as an ectopic site in the ventricles. PVC
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Pairs (couplets): two sequential PVCs “Runs” or “Bursts”: 3 or more PVCs in a row Bigeminal PVCs: every other beat is a PVC Trigeminal PVCs: every third beat is a PVC Quadrigeminal PVCs: every fourth beat is a PVC
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Uniform & Multiformed PVCs › PVCs that look alike in the same lead and begin from the same anatomic site are called uniform PVCs. › PVCs that look different from one another in the same lead are called multiform PVCs.
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Interpolated PVCs › An interpolated PVC doesn’t have a full compensatory pause. R-on-T PVCs › R-on-T PVCs occur when the R wave of a PVC falls on the T wave of the preceding beat. Paired PVCs (Couplets) › Two PVCs in a row are called a couplet or paired PVC.
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A ventricular escape beat occurs after a pause in which a supraventricular pacemaker failed to fire. A ventricular escape or idioventricular rhythm (IVR) exists when 3 or more ventricular escape beats occur in a row at a rate of 20-40 bpm. If the patient is not breathing & they have no pulse despire the appearance of organized electrical activity on the cardiac monitor, a clinical situation called pulseless electrical activity (PEA) exists.
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An accelerated idioventricular rhythm (AIVR) exists when 3 or more ventricular beats occur in a row at a rate of 41-100 bpm.
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Ventricular tachycardia exists when 3 or more PVCs occur in a row at a rate greater than 100 bpm. Notice HR
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Monomorphic VT › When the QRS complexes of VT are of the same shape & amplitude, the rhythm is called monomorphic VT.
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Polymorphic VT › When QRS complexes of VT vary in shape and amplitude from beat to beat, the rhythm is called polymorphic VT. › Polymorphic VT that occurs in the presence of a long QT interval is called torsades de pointes (TdP). › Long QT syndrome is an abnormality of the heart’s electrical system.
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Ventricular fibrillation is a chaotic rhythm that begins in the ventricles. There is no organized depolarization of the ventricles.
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Defibrillation is the therapeutic delivery of an unsynchronized electrical current through the myocardium over a very brief period to terminate a cardiac dysrhythmia.
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Asystole is the total absence of ventricular electrical activity.
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