Data presented in this article relates to the research article entitled "Association between QRS duration on prehospital ECG and mortality in patients with suspected STEMI" (Hansen et al., in press) [1]. Data on the prognostic effect of automatically recoded QRS duration on prehospital ECG and presence of classic left and right bundle branch block in 1777 consecutive patients with confirmed ST ...

Records from patients with the Wolff-Parkinson-White syndrome were reviewed with particular emphasis on the occurrence of bundle-branch block aberration during reciprocating tachycardia and the significance of this observation with respect to accessory pathway location. Increase by greater than 25 ms in the ventriculoatrial interval during reciprocating tachycardia with bundle-branch block, whe...

In order to determine whether the electrocardiographic criteria of left ventricular hypertrophy apply in the presence of left bundle-branch block we studied 79 cases of intermittent left bundle-branch block and compared the QRS voltage and axis before and after its onset. Cases of incomplete left bundle-branch block were excluded. There was a statistically significant correlation between pre- a...

Objectives. We sought to assess the outcome of patients with acute myocardial infarction (MI) and bundle branch block in the thrombolytic era. Background. Studies of patients with acute MI and bundle branch block have reported high mortality rates and poor overall prognosis. Methods. The North American population with acute MI and bundle branch block enrolled in the Global Utilization of Strept...

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Figure 1. (Panel A) 12-lead ECG depicting high degree right bundle branch block (see text for details). (Panel B) 12-lead ECG depicting the “Chiale” maneuver Right apical ventricular pacing during with timed A-V intervals in the fused QRS complexes. Black arrows show classic type 1 Brugada ECG pattern. Upon cessation of pacing, high-degree right bundle branch block reappears (white arrows). ECG...

A 30-year-old man with typical findings of the athletic heart syndrome is presented because of the unique feature of intermittent left bundle branch block. Observations during right atrial pacing and exercise support the concept of autonomic control of intraventricular conduction, both adrenergic and cholinergic.

block with intact atrioventricular conduction: electrophysiologic and pathologic correlations in three cases. Am J Cardiol 32: 783, 1973 28. Narula OS, Gann D, Samet P: Prognostic value of H-V interval. In His Bundle Electorcardiography and Clinical Electrophysiology, edited by Narula OS. Philadelphia, FA Davis Company, 1975, p 437 29. Dhingra RC, Denes P, Wu D, Wyndham CR, Amat-y-Leon F, Towne...

A ventricular fusion beat reflects the simultaneous activation of the ventricles by two impulses usually a sinus impulse and an ectopic ventricular impulse each activating part of the ventricles. The resulting QRS complex has a configuration that is in between that of the 'pure' uncomplicated sinus beat, and the 'pure' uncomplicated ectopic ventricular beat. If, however, the sinus beat is condu...

Multiple areas of concealed intraventricular conduction are deduced on the basis of aftereffects observed in His bundle recordings. Electrocardiograms and His bundle recordings are presented from two patients with unstable bilateral bundle branch block, the instability of which depended on the interval at which ventricular depolarization was initiated by sinus or paced impulses. This circumstan...