PT  - JOURNAL ARTICLE
AU  - M B Rosenbaum
AU  - L A Girotti
AU  - J O Lázzari
AU  - M S Halpern
AU  - M V Elizari
TI  - Abnormal Q waves in right sided chest leads provoked by onset of right bundle-branch block in patients with anteroseptal infarction.
AID  - 10.1136/hrt.47.3.227
DP  - 1982 Mar 01
TA  - British Heart Journal
PG  - 227--232
VI  - 47
IP  - 3
4099  - http://heart.bmj.com/content/47/3/227.short
4100  - http://heart.bmj.com/content/47/3/227.full
SO  - Heart1982 Mar 01; 47
AB  - In five cases of anteroseptal myocardial infarction complicated by intermittent right bundle-branch block, the onset of right bundle-branch block provoked the appearance of abnormal Q waves in leads V1 and V2, whereas a small initial R wave was present in the same leads during normal conduction. The intermittency of the conduction disturbance indicated that the Q waves were "right bundle-branch block dependent". It was also apparent that right bundle-branch block shifted the electrical location of the infarct towards the right, and made it look much larger. Right bundle-branch block dependent Q waves may arise during the acute stage of an anterior infarct suggesting, fallaciously, that an acute extension has occurred, or during the chronic stage, leading to the erroneous supposition that a new infarct had developed. The abnormal Q waves anteroseptal infarction complicated by fixed right bundle-branch block, though obviously related to the infarct, may be dependent on the right bundle-branch block.