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Vulnerability to sympathetic stress does not persist in takotsubo stress cardiomyopathy

Olov Collste1, Mahbubul Alam2, Martin Sundqvist1

  • 1Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden.

Journal of Cardiac Failure
|October 1, 2014
PubMed

Insights

Dobutamine stress echocardiography (DSE) did not reveal abnormal cardiac function in stable takotsubo stress cardiomyopathy (TSC) patients, suggesting sympathetic stimulation vulnerability may not persist after recovery.

Area of Science:

  • Cardiology
  • Cardiovascular Imaging
  • Stress Testing

Background:

  • Takotsubo stress cardiomyopathy (TSC) is characterized by transient left ventricular dysfunction.
  • The persistence of cardiac dysfunction or altered response to stress in TSC patients post-acute phase is not fully understood.
  • Assessing cardiac function during stress is crucial for understanding underlying pathophysiology.

Purpose of the Study:

  • To evaluate cardiac function in stable takotsubo stress cardiomyopathy patients using dobutamine stress echocardiography (DSE).
  • To determine if TSC patients exhibit persistent abnormalities or altered responses to sympathetic stimulation after recovery from the acute phase.

Main Methods:

  • A case-control study involving 22 TSC patients and 22 matched controls.
  • Dobutamine stress echocardiography (DSE) was performed to assess cardiac function.
  • Myocardial performance index (MPI) derived from tissue Doppler imaging was used to evaluate ventricular function at rest and during DSE.

Main Results:

  • TSC patients exhibited a significantly higher left ventricular MPI at rest compared to controls (0.59 vs 0.53, P=.01).
  • A trend towards higher right ventricular MPI was observed in TSC patients at rest (0.47 vs 0.38, P=.08).
  • No significant differences in MPI were found between TSC patients and controls during DSE.

Conclusions:

  • While TSC patients show altered resting ventricular function, this difference disappears during dobutamine stress.
  • The study indicates that vulnerability to sympathetic stimulation does not persist in TSC patients after the acute phase.
  • DSE may not be a sensitive tool for detecting persistent functional abnormalities in stable TSC patients.
Abstract

Keywords:
Takotsubo stress cardiomyopathydobutamine stress echocardiographymyocardial performance indextissue Doppler imaging

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