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Myocardial Infarction Diagnosis Quiz

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Questions and Answers

Which enzymes released from necrotic cells during a myocardial infarction are more specific for heart tissue?

Creatine phosphokinase with M and B subunits (CKMB) and myosin

Lactic dehydrogenase (LDH-1) and creatine phosphokinase with M and B subunits (CKMB) (correct)

Aspartate aminotransferase (AST) and myosin

Lactic dehydrogenase (LDH-1) and aspartate aminotransferase (AST)

Which substance, elevated a few hours after MI, provides an earlier confirmation of a myocardial infarction?

Lactic dehydrogenase (LDH-1)

Troponin (correct)

Myosin

Creatine phosphokinase with M and B subunits (CKMB)

Which abnormal laboratory findings are common in patients with myocardial infarction, signifying inflammation?

Leukocytosis, elevated CRP, and erythrocyte sedimentation rate (correct)

Elevated serum electrolytes

Arterial blood gases abnormalities

High levels of myosin and troponin

Which enzyme is not typically released from necrotic cells during a myocardial infarction?

Alkaline phosphatase Signup and view all the answers

Which measurements are helpful in determining ventricular function during a myocardial infarction?

Pulmonary artery pressure measurements Signup and view all the answers

Which of the following is the most specific ECG change that confirms the diagnosis of a myocardial infarction?

Pathological Q waves Signup and view all the answers

Which of the following serum enzymes is the earliest marker of myocardial necrosis after a myocardial infarction?

Troponin Signup and view all the answers

Which of the following serum electrolyte abnormalities is most commonly seen in patients with a myocardial infarction?

Hypokalemia Signup and view all the answers

Which of the following laboratory findings is NOT commonly seen in patients with a myocardial infarction?

Thrombocytosis Signup and view all the answers

Which of the following measurements is the most helpful in determining ventricular function during a myocardial infarction?

Pulmonary artery pressure Signup and view all the answers

Which of the following enzyme isoforms is the most specific marker for myocardial injury during a myocardial infarction?