Characteristic Imaging Finding in Takotsubo Cardiomyopathy
The hallmark imaging finding in Takotsubo syndrome is apical ballooning—characterized by hypo-, a-, or dyskinesia of the mid-apical left ventricular segments with compensatory basal hyperkinesis, creating a distinctive balloon-like appearance during systole that extends beyond a single coronary artery territory. 1
Primary Imaging Patterns
The 2018 International Expert Consensus Document identifies four distinct variants 1:
1. Apical Ballooning (Most Common)
- Mid-apical myocardial segments show hypo-, a-, or dyskinesia
- Often associated with hypokinetic mid-segments
- May involve the anterior or entire interventricular septum, inferior or midventricular anterolateral wall
- Approximately one-third of patients demonstrate the "apical nipple sign"—a small zone of preserved contractility at the most distal apex 1
2. Midventricular Pattern
- Hypo-, a-, or dyskinesia of midventricular segments
- Resembles a "cuff" appearance
- Apical and basal segments remain relatively preserved
3. Basal (Reverse) Pattern
- Only basal segments involved (rare variant)
- Commonly associated with subarachnoid hemorrhage, epinephrine administration, or pheochromocytoma 1
4. Focal Pattern
- Typically involves anterolateral segment
- Requires cardiac MRI to differentiate from acute coronary syndrome or myocarditis 1
Critical Diagnostic Features
Wall motion abnormalities that extend beyond a single coronary artery distribution are pathognomonic 1. This creates a "circular" pattern of systolic dysfunction on speckle-tracking echocardiography 1.
Quantitative Criteria
A wall motion score index (WMSI) ≥1.75 with more than four dysfunctional segments identifies Takotsubo with 83% sensitivity and 100% specificity 1.
Imaging Modality-Specific Findings
Echocardiography (Most Commonly Used)
- Symmetric regional wall motion abnormalities
- Basal hyperkinesis with apical/mid-ventricular dysfunction
- May reveal left ventricular outflow tract obstruction (occurs in ~20% of cases) 1
- Bulging of basal interventricular septum 1
Left Ventriculography
- Classic "octopus trap" morphology during systole
- Demonstrates perfusion-contraction mismatch when compared with coronary angiography 1
- Essential for confirming diagnosis when coronary angiography shows non-obstructive disease
Cardiac MRI
- T2-weighted images show global edema of mid and apical myocardium with normal basal signal intensity 1
- Absence of late gadolinium enhancement in ischemic pattern
- Superior for identifying focal variants 1
Nuclear Imaging
- Large, severe fixed defect in circumferential apical territories with spared bases 2
- Apical perfusion defect that does not correlate with a single coronary artery territory 2
Key Diagnostic Pitfall
The critical distinction from acute myocardial infarction requires demonstrating that wall motion abnormalities do NOT correspond to a single coronary artery territory. Coronary angiography showing non-obstructive coronary disease combined with the characteristic ballooning pattern confirms the diagnosis 1.
Important Caveat
In patients with coexisting coronary artery disease, careful comparison of coronary angiography and biplane ventriculography in similar views is mandatory to identify perfusion-contraction mismatch 1. This distinguishes Takotsubo from true myocardial infarction in the presence of obstructive coronary disease.