Takotsubo cardiomyopathy

A 64 year old female with a history of hypertension presents with sudden onset chest pain and shortness of breath for 1 hour. She reports recent severe emotional stress due to her husband’s terminal illness. Vital signs show blood pressure 100/60 mmHg, pulse 106/min, and oxygen saturation 92% on room air. Laboratory studies reveal mild elevation of troponins. ECG shows ST segment elevation. Echocardiography demonstrates apical ballooning with hypercontractile basal segments. Coronary angiography shows no obstructive coronary artery disease. Diagnosis?

Diagnosis is Takotsubo cardiomyopathy.

1. Definition

Takotsubo cardiomyopathy is a transient non ischemic cardiomyopathy characterized by reversible regional left ventricular systolic dysfunction that mimics acute myocardial infarction but occurs without obstructive coronary artery disease.

2. Epidemiology

1. Accounts for approximately 1 to 2 percent of suspected acute coronary syndrome cases
2. Predominantly affects postmenopausal women
3. Mean age is around 60 to 70 years

3. Pathophysiology

1. Triggered by emotional or physical stress
2. Leads to catecholamine surge
3. Mechanisms include:
• Direct catecholamine mediated myocardial toxicity
• Microvascular dysfunction
• Coronary vasospasm
4. Results in regional wall motion abnormalities extending beyond a single coronary territory

4. Clinical Features

1. Chest pain and dyspnea are most common
2. May also present with:
• Syncope
• Arrhythmias
• Heart failure
• Cardiogenic shock

5. Diagnosis

5.1 Laboratory

1. Mild elevation of troponins that is disproportionate to ECG changes
2. Elevated BNP is common

5.2 ECG

1. ST segment elevation initially
2. Followed by T wave inversion

5.3 Echocardiography

1. Apical ballooning
2. Hypokinesis or akinesis of apical and mid segments
3. Hypercontractile basal segments
4. Reduced left ventricular ejection fraction

5.4 Coronary Angiography

1. No significant coronary artery obstruction
2. Required to exclude acute coronary syndrome

5.5 Cardiac MRI

1. Demonstrates myocardial edema
2. Helps exclude myocarditis
3. Shows absence of infarction pattern

6. Diagnostic Criteria (Mayo Clinic)

1. Transient regional wall motion abnormalities beyond a single vascular territory
2. Absence of obstructive coronary artery disease
3. New ECG changes or modest troponin elevation
4. Absence of pheochromocytoma and myocarditis

7. Management

7.1 Initial Approach

1. Treat as acute coronary syndrome until excluded

7.2 Stable Patients

1. Beta blockers
2. ACE inhibitors or ARBs
3. Diuretics if heart failure present
4. Continue therapy for 3 to 6 months with follow up imaging

7.3 Complications

1. Anticoagulation if left ventricular thrombus present
2. Manage cardiogenic shock based on presence or absence of left ventricular outflow tract obstruction

8. Complications

1. Heart failure
2. Arrhythmias
3. Left ventricular outflow tract obstruction
4. Thromboembolism
5. Cardiogenic shock

9. Prognosis

1. Usually reversible with recovery in weeks to months
2. Mortality ranges from 0 to 8 percent
3. Recurrence occurs in approximately 5 percent

10. Key Clinical Insight

Acute coronary syndrome like presentation + emotional stress + apical ballooning + normal coronary arteries = Takotsubo cardiomyopathy

11. Exam Level Pearls

1. Mimics myocardial infarction but no coronary obstruction
2. Troponin elevation is modest compared to ECG findings
3. BNP elevation is often marked
4. Apical ballooning is the classic finding
5. Most common in postmenopausal women
6. Diagnosis requires coronary angiography
7. Wall motion abnormalities extend beyond one vascular territory