[Overturned left type - manifestation of impaired intraventricular stimulus conduction or position dependent?].

When an overturned left type is present special criteria render possible the diagnosis of the left-anterior fascicular block. Among 7,687 ECG in 698 cases (9.1%) an overturned left type was to be seen. In accidental random test of 300 ECG with overturned left type in 183 cases (61%) a left-anterior fascicular block, in 111 cases (37%) an overturned QRS-left position were found. In 6 cases (2%) a decision was not possible. The left-anterior fascicular block increasedly appears with growing age beyond the 50th year of life. Hypertension (67%), chronic ischaemic heart disease (46%) clearly prevail in patients with left-anterior fascicular block, on the other and non-cardiovascular diseases with 58% more frequently appeared in the group of patients with overturned QRS-left-position. In this group hypertension occurred only in 33%, chronic ischaemic heart disease only in 14%.