a premature ventricular complex (pvc) arises from an irritable table site within either ventricle. ...
TRANSCRIPT
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
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
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.
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.
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.
An accelerated idioventricular rhythm (AIVR) exists when 3 or more ventricular beats occur in a row at a rate of 41-100 bpm.
Ventricular tachycardia exists when 3 or more PVCs occur in a row at a rate greater than 100 bpm.
Notice HR
Monomorphic VT› When the QRS complexes of VT are of the
same shape & amplitude, the rhythm is called monomorphic VT.
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.
Ventricular fibrillation is a chaotic rhythm that begins in the ventricles. There is no organized depolarization of the ventricles.
Defibrillation is the therapeutic delivery of an unsynchronized electrical current through the myocardium over a very brief period to terminate a cardiac dysrhythmia.
Asystole is the total absence of ventricular electrical activity.