When is a transesophageal echocardiogram (TEE) ordered in patients with ischemic stroke?

When is TEE Ordered for Ischemic Stroke?

TEE should be ordered selectively in ischemic stroke patients, primarily for those with cryptogenic stroke (ESUS) who are younger, have suspected cardioembolic sources, and are candidates for anticoagulation—though it changes management in only a minority of cases (10-17%). 1

Primary Indications for TEE

Cryptogenic Stroke/ESUS (Class 2b, Level C-LD)

• TEE is most appropriate for embolic stroke of undetermined source (ESUS) when trying to identify cardioaortic sources or transcardiac pathways for embolism 1
• In ESUS patients, TEE reveals additional findings in 52% but changes management in only 16% of cases 1
• The most common management changes include:
  • Initiation of anticoagulation therapy (pooled rate 8.7% across studies)
  • PFO closure decisions
  • Intravenous antibiotic therapy for endocarditis

Specific Clinical Scenarios Where TEE Has Higher Yield

Younger patients (<55-60 years):

• TEE has significantly higher diagnostic and therapeutic impact in younger stroke patients 2
• One study showed TEE changed management more frequently in patients ≤55 years 2

Suspected cardioembolic stroke with:

• Normal neurovascular imaging 3
• Elevated C-reactive protein ≥10 mg/L (increases likelihood of infectious endocarditis by 22-fold) 1
• Clinical suspicion for specific cardiac pathology (thrombus, endocarditis, tumor)

When specific cardiac sources are suspected:

• Left atrial appendage thrombus (most common major finding, detected in 16% of patients) 4
• Patent foramen ovale evaluation (though TCD is comparable for detecting right-to-left shunt with 96.1% sensitivity) 1
• Aortic atheroma
• Cardiac tumors (papillary fibroelastoma, myxoma)
• Prosthetic valve abnormalities
• Native valve endocarditis

When TEE Should NOT Be Ordered

Limited utility in:

• Patients ≥80 years old: TEE changed management in only 2.5% of cases overall, and when excluding anticoagulation for aortic atheroma, resulted in NO management changes 5
• Patients with identified stroke mechanism (e.g., large vessel atherosclerosis, lacunar stroke)
• Patients with atrial fibrillation already documented (anticoagulation already indicated)
• Patients who are not candidates for anticoagulation or interventional procedures
• When transthoracic echo already shows definitive indication for anticoagulation

Algorithmic Approach

Step 1: Initial evaluation

• All stroke patients get transthoracic echocardiography (TTE) first 1
• ECG and prolonged cardiac monitoring (≥2 weeks) to detect paroxysmal AF 1, 3

Step 2: Consider TEE if:

• Age <60 years with cryptogenic stroke AND
• Candidate for anticoagulation or PFO closure AND
• TTE non-diagnostic or normal AND
• No contraindications to anticoagulation

Step 3: TEE may be reasonable if:

• Age 60-80 years with ESUS
• High clinical suspicion for specific cardiac source (elevated CRP, clinical endocarditis features)
• Suspected cardioembolic mechanism despite negative initial workup

Step 4: Generally avoid TEE if:

• Age ≥80 years (very low yield for management change)
• Stroke mechanism already identified
• Patient not a candidate for anticoagulation or intervention
• AF already documented

Important Caveats

TEE vs. Alternative Imaging:

• Cardiac CT has modest sensitivity (72%) but high specificity (95%) for embolic sources, using TEE as gold standard 1
• Cardiac MRI reduces cryptogenic stroke diagnosis by only ~1% beyond TEE 1
• TCD is comparable to TEE for PFO detection (96.1% sensitivity, 92.4% specificity) and is less invasive 1

TEE superiority over TTE:

• TEE detects cardiac embolic sources in ~40% of patients with normal TTE, independent of age 4
• TEE is superior for: LA appendage thrombus, aortic atheroma, atrial septal abnormalities, small vegetations 1
• TTE is preferred for left ventricular thrombus detection 1

Timing considerations:

• TEE can be performed as inpatient or outpatient 6
• Should be part of diagnostic workup completed within 48 hours when feasible 1

Bottom Line

TEE provides actionable information in a minority of acute stroke patients. 1 The key is patient selection: focus on younger patients (<60 years) with cryptogenic stroke who are anticoagulation candidates. In patients ≥80 years, the yield is so low that TEE should generally be avoided unless there's compelling clinical suspicion for a specific treatable cardiac source. Always obtain TTE first, and consider TCD as a less invasive alternative for PFO screening.