His bundle extrasystoles revisited: the great ... - PubMed
An electrophysiological study revealed prolonged atrial-His and His-ventricular (HV) intervals and frequent His bundle (H) extrasystoles. The latter manifested in the surface electrocardiogram as premature atrial, junctional, or ventricular beats, as well as …
Premature Beats and Unexpected Heart Block:
2012年4月1日 · His bundle extrasystoles manifest as “unexpected” heart block or PR interval prolongation and premature atrial and ventricular complexes. Intracardiac recordings can confirm the diagnosis by demonstrating spontaneous His bundle depolarization signals.
Resolution of Bundle Branch Block | Circulation - AHA/ASA Journals
2019年4月15日 · His extrasystole peels back refractory period in the left bundle which resolves left bundle branch block and thus normalizes the QRS complex morphology. HV interval during sinus rhythm with left bundle branch block is 73 ms, with narrow is QRS 61 ms, and with extrasystole is 61 ms.
Our case is an example of interpolated extrasystoles arising in the main bundle of His. The case is of special interest because (1) it is the first instance with documentation of the site of origin through recordings of His bundle potentials (in all previously reported cases of main-stem
Concealed His extrasystoles: A masquerader of atrioventricular …
Concealed His extrasystoles are a well-known masquerader of atrioventricular (AV) block. It is therefore necessary to consider pseudo-AV block in patients who develop unexpected AV block without a clear etiology.
the premature complexes suggested a diagnosis of His bundle extrasystoles, though this hypothesis did not explain the sustained rapid heart rates. An electrophysiology study was performed. With recording catheters at the high right atrium, His bundle, and right ventricular apex, the intracardiac correlates
Spontaneous His-bundle extrasystoles (H’) arising at an H-H’ interval of 257 msec producing bigeminal rhythm. H’ fails to conduct to the ventricle but conducts retrograde to the atrium resulting in reversal of atrial activation from low to high atrium, associated with an
His Bundle Extrasystoles Revisited: The Great Electrocardiographic ...
2011年6月7日 · An electrophysiological study revealed prolonged atrial-His and His-ventricular (HV) intervals and frequent His bundle (H) extrasystoles. The latter manifested in the surface electrocardiogram as premature atrial, junctional, or ventricular beats, as well as 2° AVB that mimicked Wenckebach or Mobitz II block.
(PDF) His Bundle Extrasystoles Revisited: The Great ...
His bundle extrasystoles (marked by asterisks), manifesting in the surface ECG lead as: (A) blocked atrial premature beat; (B) AV junctional premature beat; (C) ventricular premature beat. its effect on AV conduction.
A His bundle extrasystole can both induce and reverse 2:1
An electrophysiological study revealed a predominant 1:1 AV conduction with markedly prolonged AH interval and frequent His bundle extrasystoles (H). A properly timed H could induce periods of 2:1 AV nodal block and 1:1 AV conduction could only resume following another properly timed H. Procainamide suppressed H.