Key result
Acute Takotsubo syndrome causes reversible compression of coronary artery-left ventricular micro-fistulae during myocardial stunning.
Why the study?
Only one case had previously been published showing Takotsubo syndrome with acute compression of coronary artery-left ventricular micro-fistulae that reappeared as left ventricular function normalized.
Case Report (n=1)
No
This case report demonstrates transient complete compression of coronary artery-left ventricular micro-fistulae during the acute phase of Takotsubo syndrome with subsequent reappearance upon left ventricular recovery, supporting the hypothesis that stunned myocardium acts as a 'myocardial cramp' that externally compresses the intramyocardial microcirculation.
Answers are grounded in this paper and cite their sources.
Myocardial stunning may transiently compress micro-fistulae in Takotsubo; extends prior case but remains hypothesis-generating.
Takotsubo syndrome (TS) is an acute cardiac disease characterized by a unique regional, circumferential, and reversible left ventricular wall motion abnormality (LVWMA). The characteristic feature of LVWMA in TS is myocardial stunning, in which the affected myocardium represents a state of cardiac "cramp". The severity of this myocardial cramp is variable. It may be severe enough to cause compression of both the intramyocardial coronary micro- and macrocirculation. Currently, only one case has been published featuring TS and compressed (or invisible) coronary artery-left ventricular micro-fistulae (CALVMF) during the acute stage of TS, along with its reappearance as the left ventricular function normalized. In this report, evidence for complete compression of CALVMF arising from both the left anterior descending artery and posterior descending artery draining into the left ventricle during the acute stage of TS in a second case is presented. This observation was confirmed by the reappearance of CALVMF on follow-up coronary angiography after left ventricular function had completely normalized. This novel finding further indicates that myocardial stunning in TS represents a state of cardiac cramp and that the coronary microvascular dysfunction observed in some patients with TS is secondary to compression of the intramyocardial resistance microcirculation.
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Shams Y‐Hassan (2026) conducted a case report in Takotsubo syndrome with coronary artery-left ventricular micro-fistulae (n=1). Myocardial stunning in acute Takotsubo syndrome vs. Normalized left ventricular function at follow-up was evaluated on Reappearance of coronary artery-left ventricular micro-fistulae (CALVMF) on coronary angiography after normalization of left ventricular function. Myocardial stunning in acute Takotsubo syndrome caused complete transient compression of coronary artery-left ventricular micro-fistulae, which reappeared at 2 and 53 months after LV recovery.
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