Intermittent left bundle branch block: what is the mechanism?

Intermittent left bundle branch block revealed during anaesthesia.

Intermittent left bundle branch block is uncommon. During anaesthesia,, left bundle branch block may be related to hypertension or tachycardia and its occurrence makes the diagnosis of acute myocardial ischaemia or infarction difficult. Patients with intermittent left bundle branch block often develop established left bundle branch block, which may represent an earlier state of ischaemic heart ...

Intermittent left bundle branch block

Presenting electrocardiograms of intermittent left bundle branch block in a 60-year-old female.

Intermittent left bundle branch block in the athletic heart syndrome.

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.

The spatial ventricular gradient: intermittent Wolff-Parkinson-White syndrome, intermittent left bundle branch block and ventricular premature contractions.

Narrow QRS Complexes in a Patient with Baseline Surgical RBBB: What is the Mechanism?

A 26-year-old woman born with Tetralogy of Fallot initially underwent a left Blalock-Taussig shunt followed by a complete repair with a transannular patch at 2 years of age. She complained of non-sustained short episodes of palpitations. Her Holter monitor showed episodes of six beat run of non-sustained ventricular tachycardia. She was scheduled to undergo surgical pulmonary valve replacement....