Second Degree AV Block Type I aka Mobitz I / Wenckebach • Normal P waves. • The PRI progressively lengthens until a P wave is not followed by a QRS. • As the PRI lengthens, there is shortening of the RR interval. • The RR interval containing the dropped P wave is less than 2x of the shortest RR interval. • The PRI (may be normal or prolonged) of the first conducted P wave is shorter than the last conducted PRI. • The largest increment in the PRI is usually on the second conducted P wave. • There is "group-beating" on the ECG. #Second #Degree #AVBlock #TypeI #MobitzI #Type1 #Wenckebach #diagnosis #cardiology #ecg #ekg #electrocardiogram
