Feasibility of ¹⁸FDG PET in the cardiac inflammation

Area of Science:

• Nuclear Medicine
• Cardiology
• Inflammatory Diseases

Background:

• Cardiac inflammation, including endocarditis and sarcoidosis, requires accurate diagnostic imaging.
• ¹⁸FDG PET is utilized for assessing inflammation, but its role in cardiac conditions and the utility of delayed imaging require further evaluation.

Purpose of the Study:

• To evaluate the feasibility and diagnostic value of ¹⁸FDG PET for cardiac inflammation.
• To specifically assess the impact of delayed scans on imaging accuracy.
• To investigate the detection of extracardiac inflammation foci and their diagnostic implications.

Main Methods:

• Retrospective review of 35 ¹⁸FDG PET scans in patients with suspected or confirmed cardiac inflammation (endocarditis or sarcoidosis).
• Standard head-to-mid-thigh scans were performed 45-60 minutes post-injection, followed by a delayed cardiac scan 1 hour later.
• Analysis focused on detecting active inflammation, comparing standard and delayed scan results, and identifying extracardiac findings.

Main Results:

• ¹⁸FDG PET confirmed active inflammation in 10 out of 35 scans.
• Delayed scans showed increased SUVmax in positive cases but did not alter diagnostic outcomes compared to standard scans.
• Whole-body imaging identified extracardiac inflammation in 5 of 14 suspected endocarditis cases, potentially changing the initial diagnosis.

Conclusions:

• ¹⁸FDG PET is a valuable tool for assessing cardiac inflammation and localizing active inflammatory sites.
• Whole-body capability of ¹⁸FDG PET aids in detecting extracardiac inflammation, which can influence patient diagnosis and management.
• Delayed cardiac scans using ¹⁸FDG PET did not provide additional diagnostic value in this study.