Myocardial contusion in chest trauma.

Area of Science:

• Cardiology
• Trauma Medicine
• Diagnostic Imaging

Background:

• Severe trauma can lead to myocardial dysfunction.
• Blunt chest injury is a significant concern in trauma patients.
• Assessing ventricular function is crucial for managing trauma patients.

Purpose of the Study:

• To prospectively assess left and right ventricular function in severe trauma patients.
• To evaluate the sensitivity of radionuclide angiography in detecting myocardial contusion.
• To explore the relationship between ventricular function and cardiopulmonary parameters post-trauma.

Main Methods:

• Electrocardiographically gated blood pool radionuclide angiography was used in 25 severe trauma patients.
• Ventricular wall motion abnormalities were identified and quantified.
• Comparison with enzymatic, electrocardiographic, and scintigraphic methods for myocardial contusion detection.
• Cardiopulmonary monitoring was employed to assess functional relationships.

Main Results:

• Focal ventricular wall motion abnormalities were detected in 17 patients (12 right, 2 left, 3 biventricular).
• Radionuclide angiography proved more sensitive for myocardial contusion than other methods.
• Elevated right ventricular end-diastolic volume reduced left ventricular function and compliance.
• Inverse relationships were observed between right ventricular ejection fraction and pulmonary vascular resistance, and pulmonary vascular resistance and left ventricular function.

Conclusions:

• Right ventricular contusion is more frequent in blunt chest trauma than previously recognized.
• Positive radionuclide angiography is strong evidence of direct myocardial injury.
• Left ventricular function remains preload-dependent but can be compromised by increased pulmonary vascular resistance and reduced compliance.