^99mTc-sestamibi and ¹⁸F-fluorodeoxyglucose imaging in patients with cardiogenic shock: A pilot study

Area of Science:

• Cardiology
• Nuclear Medicine
• Medical Imaging

Background:

• Cardiogenic shock (CS) is a severe complication of ST-segment elevation myocardial infarction (STEMI).
• The differences in perfusion and metabolism imaging between STEMI patients with and without CS are not well understood.
• Assessing myocardial viability and function post-STEMI is crucial for patient management.

Purpose of the Study:

• To compare perfusion and metabolism imaging findings in STEMI patients with and without CS.
• To investigate the relationship between imaging parameters and left ventricular ejection fraction (LVEF) improvement.
• To determine the predictive value of imaging for major adverse cardiac events (MACE) in STEMI patients with CS.

Main Methods:

• Prospective recruitment of 17 STEMI patients with CS and 16 matched STEMI patients without CS.
• Baseline and follow-up ^99mTc-sestamibi/¹⁸F-fluorodeoxyglucose (FDG) imaging and echocardiography.
• Calculation of total perfusion deficit (TPD) and total FDG uptake deficit (TFD) to quantify myocardial impairment.
• Long-term follow-up for recording of MACE.

Main Results:

• STEMI patients with CS exhibited significantly greater TPD compared to those without CS (OR: 4.36, p=0.013).
• Both acute and convalescent TFD were inversely correlated with LVEF improvement ratio (r=-0.62, -0.73; p<0.05).
• Acute TFD predicted MACE in STEMI patients with CS (HR: 2.06, p=0.038).

Conclusions:

• STEMI patients with CS demonstrate increased TPD, indicating significant myocardial damage.
• FDG uptake deficit (TFD) is a valuable marker for predicting LVEF recovery and MACE in STEMI patients experiencing CS.