three isolated premature QRS complexes with a right bundle branch block morphology, with rsR' aspect in V1, but with normal QRS duration (0.08 sec), which could have been either junctional extrasystole with aberrant intraventricular conduction or ventricular extrasystole with the origin in the proxi...
Ventricular fluttermay be a regular (cycle length variability 30 ms or less)monomorphic VTthat happens at a really rapid rate of 150–300 beats/min (usually around 200beats/min). Often, no distinctive T waves are discernible. There is no isoelectric interval between QRS complexes. P...
Premature Beats PBs areQRS complexesnot originating in theSA nodethat occur earlier than the next expected sinus beat. These can occur as a single PB, a pair of PBs (couplet of PBs), three PBs (by convention, nonsinustachycardia> 100 bpm). The PBs can also follow every normal beat (big...