“…These features are consistent with the type of ventricular pre-excitation first described by Lown et al (1952), in which the tachycardia, usually nodal re-entrant tachycardias, are the result of either circus movement involving the atrioventricular node and an atrioventricular nodal bypass, i.e. James bundle (James, 1961;Ward et al, 1978), or an intra-atrioventricular nodal abnormality (Caracta et al, 1973).…”