[Negative post-ischemic T waves in variant angina].
The clinical and prognostic significance of negative T waves on the basal electrocardiograms of patients with unstable angina has been recently investigated with controversial results. Moreover, there is little data regarding this phenomenon in patients with variant angina. In order to evaluate the significance of negative post-ischemic T waves in patients with variant angina, 72 patients underwent Holter recording and coronary angiography. Negative T waves were present in 38 out of 72 patients (53%): they were anterior in 24 cases and inferior in 14 cases. The negative T-wave phenomenon was present in 29 patients on admission and showed up in 9 patients during hospitalization. Holter recording showed no significant differences between patients with or without negative T waves with regards to: 1) the proportion of symptomatic transient myocardial ischemic attacks; 2) the frequency of arrhythmias during transient myocardial ischemic attacks; 3) the maximum duration of transient myocardial ischemic attacks; 4) the maximum degree of ST elevation during transient myocardial ischemic attacks. Negative T waves on the anterior leads showed a moderate sensitivity (54%) and total predictive accuracy (52%), as well as a lower specificity (43%) and negative predictive accuracy (15%) for a significant stenosis of the left anterior descending coronary artery. This was due to the presence of several patients with left anterior descending artery stenosis and without negative T waves. On the other hand, negative T waves on the inferior leads were characterized by high sensitivity (85%), specificity (80%) and total predictive accuracy (82%) for a significant stenosis of the right coronary artery and/or the circumflex artery.(ABSTRACT TRUNCATED AT 250 WORDS)
Divisione di Cardiologia A, Ospedale San Camillo, Roma.
F
F
Prati
A
A
Maddaluna
A
A
Pellegrini
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G
Turitto
E
E
Zanchi
P L
PL
Prati
D000788:Angina Pectoris, Variant / Q000150:complications / Q000503:physiopathology*; D003327:Coronary Disease / Q000150:complications / Q000503:physiopathology*; D004562:Electrocardiography; D006801:Humans; D008991:Monitoring, Physiologic; D011379:Prognosis; D011446:Prospective Studies; D013997:Time Factors
La T negativa post-ischemica nell'angina variante.