Regional right ventricular wall motion in patients with obstruction of the right coronary artery due to the mucocutaneous lymph node syndrome.

The present study quantitatively analyzed the shortening fraction of regional wall motion (RWM) of the right ventricle (RV) in 18 patients with obstruction of the right coronary artery due to the mucocutaneous lymph node syndrome (MCLS). None of the patients had any apparent lesion of the left coronary artery by selective coronary angiography. The radial approach was used except for the right ventricular outflow tract in the lateral view, using the Siemens AVD system. There was no correlation between the occlusion and segmental stenosis, nor was there any correlation between dysfunction of the RWM of the RV and the posterior wall of the left ventricle (LVPW). The second cineangiography one year later showed that shortening of three segments (II, III, and VIII) of the RV was significantly reduced, as compared with that during the first study. We believe that dysfunction of the LVPW may not be contributory in diagnosing RV infarction. Not only LV-graphy, but RV-graphy as well, are recommended for patients with RV dysfunction due to obstruction of the right coronary artery in the MCLS.