Objective: To experiment the hypothesis that right ventricular (RV) involvement in inferoposterior wall acute myocardial infarction (AMI) may affect precordial T-wave polarity.

Objective: To experiment the hypothesis that right ventricular (RV) involvement in inferoposterior wall acute myocardial infarction (AMI) may affect precordial T-wave polarity, relation of T-wave polarity in lead [Vsub1] to right (RCA) or left circumflex (LCX) coronary pathoanatomy was examined.

Methods: The close attention population included the patients with initial inferoposterior wall AMI owed to RCA (n = 61) or LCX (n = 19) occlusion within 5 h of symptom storm and 100 normal controls. The patients with RCA disease were further divided into four subgroup based in succession the site of coronary occlusion and the direction of the ST shift in lead [Vsub1]: assemblage A1 (n = 27), proximal RCA occlusion with isoelectric or elevated ST segment; clump A2 (n = 7), proximal occlusion with ST depression; assign places to B1 (n = 8), distal RCA occlusion with isoelectric or elevated ST segment; clump B2 (n = 19), distal occlusion with ST depression. vicinity or absence of an upright T wave in lead [Vsub1] ([greater than or equal to] 015 mV) was evaluated.

Results: The patients with proximal RCA disease showed a higher incidence of upright T wave (71 percent) than the have the direction ofs (27 percent) (p [less than] 0001) patients with LCX disease (26 percent) (p [les than] 001) and those with distal RCA disease (19 percent) (p [les than] 0001) Among the four subgroup of RCA disease, the incidence of upright T wave was highest in dispose A1 (90 percent), lowest in arrange B2 (6 percent), and intermediate in commands (27 percent) (p [less than] 0001 for collection A1 vs controls, and p [les than] 005 for curbs vs group B2).

Conclusions: These findings prompt that concomitant RV involvement in inferoposterior wall AMI modifies T-wave polarity of lead [Vsub1] which is ordinarily count uponed to be reciprocally drawn to negativity when infarct is limited to the inferoposterior wall of the left ventricle, to the positivity.

Although a modifying drift of concomitant right ventricular (RV) involvement in succession the precordial ST segment in inferoposterior wall acute myocardial infarction (AMI) has been indicated in a previous study[1] this import on the polarity of precordial T wave has not further been clarified. Previously, we have reported a case of angioplasty-induced RV ischemia that showed bidirectional ST-T wave shift in precordial lead [Vsub1][2] suggesting a possible influence of concomitant RV ischemia forward T-wave polarity in this lead. The general intent of acute RV infarction onward ST elevation in precordial leads, particularly lead [Vsub1] is also well known.[3-6] Accordingly, I examined the relation of T-wave polarity in lead [Vsub1] to right (RCA) or left circumflex (LCX) coronary pathoanatomy in order to criterion the hypothesis that concomitant RV involvement may affect T-wave polarity in precordial leads in inferoposterior wall AMI.

MATERIALS AND METHODS

Patients

Among the patients with AMI with catheterization-proved infarct-related bottom 61 patients with RCA disease (39 men and 22 women; average age, 659 [+ or -] 940 years [range 37 to 83]) and 19 patients with LCX disease (15 men and 4 women; average age, 637 [+ or -] 125 years [range 40 to 87]) were exquisiteed for this study according to the following criteria: (1) no history of previous myocardial infarction; (2) ECG recording within 5 h after the storming of chest pain; (3) ECG showing ST part elevation [greater than or equal to] 1 mm in leads 2 3 aVF; (4) occlusion or stenosis of the RCA or LCX revealed on emergency coronary angiography; (5) abnormal elevation of serum creatinine kinase and MB creatinine kinase activity; (6) no accompanying unimpaired atrioventricular block or intraventricular conduction disturbance; and (7) no concomitant valvular or myocardial disease.

in succession the basis of the occlusion site in the infarct-related coronary artery, patients with RCA disease were further divided into those with proximal (n = 34) and those with distal RCA disease (n = 27) In each of these assign places tos two subgroups were distinguished according to the direction of ST portion shift in lead [V.sub.1]. The patients with proximal RCA disease were divided into subgroup A1 (n = 27 patients with isoelectric or elevated ST segment) and subgroup A2 (n = 7 patients with discourageed ST segment), and the patients with distal RCA disease were divided into subgroup B1 (n = 8 patients with isoelectric or elevated ST segment) and subgroup B2 (n = 19 patients with ST depression).

undivided hundred age- and sex-matched normal make subordinates (63 men and 37 women; average age, 635 [+ or -] 115 years [range 34 to 81]) serv as manages None of the patients in the manage group had cardiac disease based in succession clinical history and physical examination. All subdues in this group were required to have a normal repose ECG, chest radiograph, and two-dimensional echocardiogram.

The clinical characteristics and angiographic rises of the controls and patients collections are listed in Table 1 The mean ages, sex distribution, and incidence of multivessel disease in the collections did not differ.

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