- See:
V Tach - More than 6 per min, 3 in a row, or R on T is pathological,; -Note if they are from the same focus; -
P waves may be present be will have no relation to
QRS wave of PVC; -
QRS is usually > 0.12 seconds w/
Left bundle branch pattern; - look for compensatory pause following PVC ; - Bigeminy: one normal sinus beat alternating w/ one PVC; - Trigeminy: two normal beats followed by one PVC; - Unifocal:: arises from one site in the ventricle; - Multifocal PVC's: arise from different sites, & have different shapes; - increased risk for
V. fib; - PVC on
T wave: - increased risk for V. fib; - PVC's ordinarily occur just after
T wave of a normal cycle;
Causes of PVC's: 1) Ischemia:
Angina/
MI 2) Valvular Heart Disease/Mitral Valve Prolapse; 3)
HTN 4) Medication Toxicity: -
Digitalis -
Aminophylline -
Epinephrine -
isoproterenol 5)
Hypokalemia: 6
Hypomagnesemia 7) Hypoxia 8)
Met. Acidosis 9) Cardiomyopathy 10) Mitral Valve Prolaspe; 11) Meds:
Digoxin 12) Hyperthyroidism 13) Caffeine 14) Anxiety 15) Anemia, 16) Normal Varient
