Myocardial infarct extension. Identification of subgroups by the pattern of the serum CKMB level

Area of Science:

• Cardiology
• Internal Medicine

Background:

• Acute myocardial infarction (AMI) can be complicated by infarct extension, impacting patient prognosis.
• Serum creatine kinase-myocardial band (CKMB) levels are used to monitor myocardial damage and detect re-infarction.

Purpose of the Study:

• To investigate the clinical course and characteristics of patients with acute myocardial infarction complicated by infarct extension.
• To differentiate between early and late extension based on CKMB kinetics and assess their clinical significance.

Main Methods:

• Prospective study of 141 patients diagnosed with acute myocardial infarction.
• Serum CKMB levels were measured at 8-hour intervals for 5 days post-admission.
• Patients were categorized into three groups: early extension (Group A), late extension (Group B), and no extension (Group C).

Main Results:

• Group A (early extension) exhibited a significantly worse clinical course, including higher rates of hemodynamic deterioration and recurrent ischemic pain, compared to Groups B and C.
• No significant differences in clinical parameters were observed between Group B (late extension) and Group C (control).
• No specific risk factors were identified for the development of infarct extension.

Conclusions:

• Serum CKMB patterns can distinguish between early and late myocardial infarct extension.
• Early extension is associated with adverse clinical outcomes, while late extension appears to have a benign clinical course.
• This distinction aids in stratifying risk and managing patients post-acute myocardial infarction.