“…2 ' 3 It was on the basis of this conventional wisdom that a group of investigators from Europe, including the first author of this review, constructed formidable conventions to justify the existence of double inlet right ventricle as a "univentricular heart". 17 It came as somewhat of a surprise, therefore, to find this concept roundly criticised by Van Praagh and his colleagues, 8 since it was Van Praagh, albeit working with a different group of collaborators, who had first promoted the arrangement of double inlet as the defining feature for "single ventricle". 2 But the logic emphasised in their criticism, namely that "large right ventricle, together with small left ventricle, does not equal single ventricle", was inescapable.…”