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2021, Number 1

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Rev Cubana Cardiol Cir Cardiovasc 2021; 27 (1)

Relationship between the Q wave in the electrocardiogram and the area of necrosis in the cardiac magnetic resonance in patients with a diagnosis of previous myocardial infarction

Pérez BA, Alfonso MO, Peix GA, Marcos GY, Rodríguez BL, Martínez GA

Language: Spanish
References: 25
Page: 1-8
PDF size: 358.29 Kb.


ABSTRACT

The size of the myocardial infarction has clinical implications. The electrocardiogram has been a very important diagnostic and prognostic tool in patients with ischemic heart disease. The objective is to determine the relationship between the Q wave in the electrocardiogram and the size of the myocardial infarction evaluated by cardiac magnetic resonance imaging in patients with a previous diagnosis. It´s a Cross-sectional study, carried out between 2017 and 2018 at the Center for Medical Surgical Research and the Institute of Cardiology and Cardiovascular Surgery, a universe of 93 patients. Cardiac resonance imaging was performed on a Magnetom Aera 1.5 T equipment. The electrocardiogram classified the cases as type Q and non-Q infarction. The presence and extent of necrosis was determined taking into account the transmurality and the number of affected segments. Basic statistical techniques were applied to analyze the results. 86% were men. In 61.3% the existence of myocardial necrosis was verified. The presence of a Q wave on the ECG had a sensitivity of 69.7% for diagnosing transmural myocardial necrosis and a specificity of 37.5%. While the sensitivity of the Q wave for the diagnosis of infarction with involvement equal to or greater than 4 myocardial segments was 64.3% and specificity of 20.7%.. The results confirm the use of the electrocardiogram to identify previous myocardial necrosis, although with limitations to define the size based on its transmurality and extension.


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