Dispersión del intervalo qt en pacientes con cardiopatía isquémica aguda. Dispersion of QT interval in patients with acute ischemic heart disease.

• Main Authors: Rosa E. Díaz Garriga, Roberto Zayas Molina, Margarita Dorantes Sánchez
• Format: Article
• Language: Spanish
• Published: ECIMED 2000-01-01
• Series: Revista Cubana de Cardiología y Cirugía Cardiovascular
• Subjects: ISQUEMIA MIOCARDICA; ANGINA PECTORIS VARIABLE; INFARTO DEL MIOCARDIO; ELECTROCARDIOGRAFIA; TERAPIA TROMBOLITICA; MYOCARDIAL ISCHEMIA; ANGINA PECTORIS; BARIANTE; MYOCARDIAL INFARCTION; ELECTROCARDIOGRA-PHY; THROMBOLYTIC THERAPY.
• Online Access: http://bvs.sld.cu/revistas/car/vol14_1_00/car03100.htm

Se evaluó la dispersión del QT en 31 pacientes: 10 portadores de angina inestable, 21 de infarto miocárdico agudo y en un grupo control de sujetos sanos. A todos se les realizó un electrocardiograma a 25 y 50 mm/s, con amplitudes de 1 y 2 mV, a su llegada al Cuerpo de Guardia, postrombólisis (casos con infarto) y a las 24, 72 h y 7 días. Los casos con angina tuvieron valores medios normales. En el infarto, las cifras fueron significativamente altas con relación al grupo control y al de angina. Las cifras postrombólisis disminuyeron significativamente en los sobrevivientes y se mantuvieron elevadas en los fallecidos. Concluimos que las cifras medias de dispersión del QT son normales en los pacientes con angina y son significativamente mayores en los casos de IMA. La trombólisis reduce la dispersión del QT, excepto en los fallecidos donde excede los 80 ms. QT dispersion was evaluated among 31 patients: 10 carriers of unstable angina, 21 with acute myocardial infarction and a control group of sound individuals. All of them underwent electrocardiogram at 25 and 55 mm/s, with amplitudes of 1 and 2 mV on their arrival to the Emergency Department, and postthrombolysis (cases with infarction) at the 24 hours, 72 hours and 7 days. Those cases with angina had normal mean values. As regards infarction, the figures were signiificantly high in relation to the control group and to that with angina. There was a marked reduction of postthrombolysis figures in survivors and they were high in those who died. It is concluded that the mean figures of QT dispersion are normal in patients with angina and significantly higher among those with AMI. Thrombolysis reduces QT dispersion, excepting in the dead, where it is over 80 m/s.