Cardiac Disorder May Affect Broader Range of Patients Than Previously Reported

Stress cardiomyopathy (SC) appears to have clinical characteristics that are broader than reported previously, including younger patients, men, and patients without an identifiable stressful trigger, according to a study published today in the Journal of the American Medical Association.

SC primarily affects postmenopausal women and is characterized by acute, profound, but reversible left ventricular (LV) dysfunction in the absence of significant coronary artery disease, according to background information in the article. “Various aspects of its clinical profile have been described in small single-center populations, but larger, multicenter data sets have been lacking so far. Furthermore, it remains difficult to quickly establish diagnosis on admission,” the authors wrote in the study.

Ingo Eitel, MD, of the University of Leipzig, Germany, and colleagues conducted a study to comprehensively define the clinical spectrum of SC and to examine the usefulness of a set of cardiovascular magnetic resonance (CMR) criteria that might aid in diagnostic decision making in suspected SC.

According to a press release, the study was conducted at seven tertiary care centers in Europe and North America between January 2005 and October 2010 among 256 patients with SC assessed at the time of presentation at the centers as well as one to 6 months after the acute event.

Patients with SC were an average age of 69 years old; 89% (n=227) were women. Eighty-one percent of patients (n=207) were postmenopausal women, 20 women (8%) were 50 years of age or younger; men accounted for 11% of cases. In 71% of patients (n=182), a significant stressful event less than 48 hours before presentation could be identified; triggering conditions were emotional stress in 30% of patients, and physical stress in 41%.

Upon presentation at the care center, electrocardiograms showed abnormalities in 87% of patients. Coronary angiography showed healthy coronary arteries in 193 patients (75%). CMR imaging detected ballooning patterns with moderate to severe reduction of LV function in all patients and four distinct patterns of regional ventricular ballooning.

“Stress cardiomyopathy was accurately identified by CMR using specific criteria: a typical pattern of LV dysfunction, myocardial edema, absence of significant necrosis/fibrosis, and markers for myocardial inflammation. Follow-up CMR imaging showed complete normalization of LV ejection fraction and inflammatory markers in the absence of significant fibrosis in all patients,” the authors wrote.

The researchers noted that their data indicate that only two-thirds of patients had a clearly identifiable preceding stressor, whereas in previous reports the percentage with preceding emotional or physical triggers was as high as 89%.

“Thus, our large multi-center cohort demonstrates that the absence of an identifiable stressful event does not rule out the diagnosis, and, hence, precipitating mechanisms may be more complex, such as involvement of vascular, endocrine, and central nervous systems,” the authors wrote. “Such clinical heterogeneity could contribute to ambiguity in the recognition of SC and thereby affect potential management strategies. Consequently, enhanced awareness and recognition of a broad clinical profile of SC as demonstrated in the current study is mandatory for correct diagnosis and treatment among patients with suspected SC.”

SourceCardiac Disorder May Affect Broader Range of Patients Than Previously Reported [Journal of the American Medical Association]