Global Microvascular Dysfunction and Incomplete Recovery in Takotsubo Syndrome: Insights From Serial PET Imaging

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Physiology

Background:

• Takotsubo syndrome (TTS) is often linked to coronary microvascular dysfunction.
• Investigating this dysfunction and its recovery is crucial for understanding TTS pathophysiology.

Purpose of the Study:

• To assess coronary microvascular dysfunction and its recovery in TTS patients.
• Utilize serial positron emission tomography myocardial perfusion imaging for detailed analysis.

Main Methods:

• Analyzed 62 TTS patients using cardiac positron emission tomography at baseline and 6-month follow-up.
• Assessed changes in myocardial perfusion, left ventricular function, myocardial blood flow (MBF), myocardial flow reserve, and coronary vascular resistance (CVR).
• Conducted segmental analysis for apical TTS cases.

Main Results:

• Global MBF, myocardial flow reserve, and CVR significantly improved post-treatment.
• All myocardial segments in apical TTS patients showed improvement in stress MBF, myocardial flow reserve, and CVR.
• Persistent abnormalities in MBF and CVR were observed in the distal segments and apex, despite normal left ventricular function.

Conclusions:

• Serial PET imaging suggests TTS-related coronary microvascular dysfunction with substantial recovery.
• Coronary microvascular dysfunction in TTS extends beyond wall motion abnormality regions.
• Regional coronary flow abnormalities may persist long-term, even with recovered left ventricular function.