Is it possible to differentiate between Takotsubo cardiomyopathy and acute anterior ST-elevation myocardial
Fabienne E Vervaat1, Thomas E Christensen2, Loes Smeijers3
1Department of Cardiology, Maastricht University Medical Centre, the Netherlands.
Insights
Electrocardiogram (ECG) criteria are insufficient to reliably differentiate Takotsubo cardiomyopathy (TC) from acute anterior ST-segment elevation myocardial infarction (STEMI) in women. Coronary angiography remains essential for definitive diagnosis.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Electrocardiography
Background:
- Takotsubo cardiomyopathy (TC) predominantly affects women, yet studies differentiating it from acute anterior ST-segment elevation myocardial infarction (STEMI) often include both genders.
- Existing electrocardiogram (ECG) criteria for distinguishing TC from STEMI rely on ST-segment deviation and/or T-wave inversion, with varying accuracy.
- This study focuses on differentiating TC from anterior STEMI in a predominantly female population meeting STEMI criteria.
Purpose of the Study:
- To evaluate the accuracy of specific ECG criteria in distinguishing TC from acute anterior STEMI in a predominantly female cohort.
- To assess the utility of ST-segment changes, frontal plane ST-vector, and mean amplitude in differentiating these conditions.
Main Methods:
- Retrospective analysis of triage ECGs from 37 women with TC and 103 women with acute anterior STEMI.
- Comparison of an existing ECG criterion (ST depression in aVR + ST elevation in V1) with frontal plane ST-vector and mean ST-segment amplitude.
- Subgroup analysis of STEMI patients based on Left Anterior Descending (LAD) artery occlusion site (proximal, mid, distal).
Main Results:
- The existing ECG criterion showed lower accuracy (76%) and sensitivity (26%) compared to previous studies.
- A frontal plane ST-vector of 60° significantly distinguished TC from all STEMI subgroups with 81% accuracy.
- TC patients exhibited significantly higher mean ST-segment amplitude in inferior leads (II, aVF) and lower amplitude in precordial leads (V1, V2) compared to STEMI patients.
Conclusions:
- Current ECG criteria are insufficient for reliably distinguishing TC from acute anterior STEMI in the studied female population.
- A frontal plane ST-vector of 60° shows promise but requires further validation.
- Coronary angiography remains the gold standard for definitively excluding acute anterior STEMI.
Introduction:
Several studies have investigated the ability of the twelve-lead electrocardiogram (ECG) to reliably distinguish Takotsubo cardiomyopathy (TC) from an acute anterior ST-segment elevation myocardial infarction (STEMI). In these studies, only ECG changes were required - ST-segment deviation and/or T-wave inversion - in TC whereas in acute anterior STEMI, ECGs had to meet STEMI criteria. In the majority of these studies, patients of both genders were used even though TC predominantly occurs in women. The aim of this study is to see whether TC can be distinguished from acute anterior STEMI in a predominantly female study population where all patients meet STEMI-criteria.
Methods:
Retrospective analysis of the ST-segment changes was done on the triage ECGs of 37 patients with TC (34 female) and was compared to the triage ECGs of 103 female patients with acute anterior STEMI. The latter group was divided into the following subgroups: 46 patients with proximal, 47 with mid and 10 with distal LAD occlusion. Three ST-segment based ECG features were investigated: (1) Existing criterion for differentiating anterior STEMI from TC: ST-segment depression >0.5mm in lead aVR+ST-segment elevation ≤1mm in lead V1, (2) frontal plane ST-vector and (3) mean amplitude of ST-segment deviation in each lead.
Results:
The existing ECG criterion was less accurate (76%) than in the original study (95%), with a large difference in sensitivity (26% vs. 91%). Only a frontal plane ST-vector of 60° could significantly distinguish TC from all acute anterior STEMI subgroups (p<0.01) with an overall diagnostic accuracy of 81%. The mean amplitude in inferior leads II and aVF was significantly higher for patients with TC compared to all patients with acute anterior STEMI (p<0.01 and p<0.05 respectively) and the mean amplitude in the precordial leads V1 and V2 was significantly lower compared to proximal and mid LAD occlusion (p<0.01).
Conclusions:
Given the consequences of missing the diagnosis of an acute anterior STEMI the diagnostic accuracy of the ECG criteria investigated in this retrospective study were insufficient to reliably distinguish patients with TC from patients with an acute anterior STEMI. To definitely exclude the diagnosis of an acute anterior STEMI coronary angiography, which remains the gold standard, will need to be performed.
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