Transesophageal Echocardiography Assessment and Management of Complications in Aortic Valve Infective Endocarditis with Severe Regurgitation

Perivalvular Complications

• The American Heart Association (AHA) states that in aortic‑valve infective endocarditis with severe aortic regurgitation, transesophageal echocardiography (TEE) must specifically evaluate for perivalvular abscess, pseudoaneurysm, fistula formation, valve perforation, and prosthetic‑valve dehiscence because each constitutes an indication for urgent surgical intervention. 1
• Perivalvular abscess appears on TEE as thickened, non‑homogeneous perivalvular tissue with mixed echodense and echolucent areas (European Society of Cardiology – ESC). 2
• Early abscesses may manifest only as nonspecific perivalvular thickening and can be missed on the initial TEE; a high index of suspicion is required (AHA). 1
• Presence of a perivalvular abscess independently predicts both in‑hospital mortality and 1‑year mortality (American College of Radiology – ACR). 3
• Pseudoaneurysm is identified on TEE as a pulsatile, echo‑free perivalvular space with flow on color Doppler (ESC). 2
• Because pseudoaneurysms develop over time, a negative early TEE does not exclude later formation (AHA). 5
• Computed tomography (CT) is often superior to echocardiography for delineating the full extent of pseudoaneurysms, especially in prosthetic‑valve patients (ACR). 3
• Fistula formation is defined as an abnormal communication between cardiac chambers or between the aorta and adjacent structures (ESC). 2
• Fistulae, like pseudoaneurysms, may not be evident on early imaging and can appear only later in the disease course (AHA). 5
• TEE with color Doppler is essential for detecting the abnormal flow patterns of fistulae (ESC). 2
• Valve perforation appears as a defect in a leaflet with an eccentric regurgitant jet (ESC). 2
• Three‑dimensional (3D) echocardiography improves the description of perforation location and size (ESC). 2
• Valve perforation is an independent predictor of 1‑year mortality (ACR). 3

Vegetation Assessment

• Vegetations larger than 10 mm are associated with a markedly increased risk of embolic events (AHA). 1
• Anterior mitral‑valve involvement (“kissing lesion”) in the setting of aortic‑valve endocarditis confers a higher embolic risk (AHA). 1
• An increase in vegetation size during antibiotic therapy signals treatment failure and a heightened embolic risk (AHA). 5
• Failure of vegetation size to decrease predicts a greater likelihood of embolic complications (AHA). 5
• Approximately 84 % of vegetations remain stable in size under appropriate therapy and do not worsen prognosis (AHA). 5

Valvular Dysfunction

• Severity of aortic regurgitation should be quantified using multiple parameters (vena contracta, regurgitant volume, regurgitant fraction) (AHA). 5
• Severe prosthetic‑valve dysfunction is an indication for early surgical intervention (American College of Cardiology – ACC). 7
• New or worsening aortic regurgitation during treatment suggests progressive valve destruction (AHA). 1
• Prosthetic‑valve dehiscence is identified on TEE by an abnormal rocking motion of the prosthesis with paravalvular regurgitation (AHA). 1
• TEE is significantly more accurate than transthoracic echocardiography (TTE) for assessing prosthetic valves (AHA). 1
• Acoustic shadowing from prosthetic components limits TTE visualization, making TEE essential (AHA). 1

Secondary Cardiac Complications

• Left‑ventricular ejection fraction < 40 % independently predicts in‑hospital mortality (ACR). 3
• Regional wall‑motion abnormalities on TEE may indicate coronary embolization (AHA). 8
• Assessment of right‑ventricular function is critical when tricuspid involvement is suspected (ESC). 2
• New atrioventricular (AV) block suggests perivalvular extension into the conduction system and warrants urgent TEE (AHA). 1

Imaging Timing and Strategies

• The AHA recommends repeat TEE whenever there is any change in clinical status (new murmur, persistent fever, heart failure, new conduction abnormality, or embolic event). 5
• Serial imaging is justified in prosthetic‑valve endocarditis because complications evolve dynamically (ACC). 7
• Intra‑operative TEE is recommended for all patients undergoing valve surgery for endocarditis to evaluate interval changes and confirm adequacy of repair (AHA). 5
• Intra‑operative TEE also serves to detect mechanical complications of the surgery (ACC). 7

Pitfalls and Technical Recommendations

• A single negative TEE cannot definitively exclude complications; overall sensitivity is ≈ 90 % for device‑related infections, and early abscesses may be missed (ACC). 7
• Small vegetations (< 5 mm) or vegetations that have already embolized may be invisible on both TTE and TEE (AHA). 1
• Anterior prosthetic‑ring abscesses are often poorly visualized by TEE and should be evaluated with complementary CT imaging (ACC). 7
• When examining prosthetic aortic valves, acquire high‑esophageal views for the aortic aspect and deep transgastric views for the ventricular aspect (ACC). 7
• Three‑dimensional echocardiography should be employed for complex lesions to accurately define size and dimensions (ESC; ACC). 2