📚 Guideline basis
Hahn RT, et al. ASE/SCA comprehensive TEE examination (JASE 2013;26:921–64); ASE/SCA guidelines on the use of TEE to assist surgical decision-making; Zoghbi WA, et al. ASE 2024 prosthetic valve guideline (JASE 2024;37:2–63); 2025 ESC/EACTS valvular heart disease guidelines.
Why this population is different
Three features make post-cardiotomy echocardiography a distinct discipline:
- The transthoracic windows are frequently absent. Sternotomy, mediastinal drains, pacing wires, dressings, positive-pressure ventilation and postoperative air in the mediastinum combine to make TTE non-diagnostic in a large proportion of patients in the first postoperative days. TEE is the default modality, not the escalation.
- Normal postoperative findings mimic pathology. A clinician applying standard reference ranges will over-diagnose in this population.
- The differential for deterioration is broad but finite, and it is dominated by one time-critical diagnosis: tamponade.
Normal postoperative findings that are not pathology
Finding | Explanation | Duration |
Paradoxical septal motion | Loss of pericardial restraint after pericardiotomy alters septal translation; the septum moves anteriorly in systole | Weeks to months; often permanent |
Reduced TAPSE and tricuspid s′ | Pericardiotomy abolishes much of the longitudinal component of RV contraction while global RV function is preserved | Persists indefinitely; use FAC, 3D RVEF or RV free wall strain instead |
Small pericardial and pleural effusions | Universal early | Resolving over days to weeks |
Mild transprosthetic regurgitation | Designed "washing jets" in mechanical valves (Chapter 23) | Permanent and normal |
Small paravalvular jets immediately after implantation | Present in 5–20%; most are haemodynamically insignificant and follow a benign course in the absence of endocarditis | Often resolve |
Aortic root thickening after a stentless valve or homograft | Postoperative haematoma and oedema | Resolves over 3–6 months; routinely mistaken for abscess (Chapter 24) |
Mild biventricular impairment early | Cardiopulmonary bypass, cardioplegic arrest, reperfusion | Recovers over 24–72 hours |
Retained air in the right heart or aortic root | De-airing | Hours |
The TAPSE point deserves emphasis. A TAPSE of 1.0 cm on postoperative day 2 does not mean severe RV dysfunction, and reporting it as such generates inappropriate inotrope escalation. Judge the RV by fractional area change and by the clinical picture.
Post-cardiotomy tamponade — the diagnosis this chapter exists for
Post-cardiotomy tamponade behaves nothing like medical tamponade, and every classical sign may be absent.
Feature | Medical tamponade | Post-cardiotomy tamponade |
Effusion | Circumferential, free-flowing, anechoic | Loculated, often posterior or retrocardiac, frequently clot (echodense, may be isoechoic with myocardium) |
Chamber collapse | RA and RV | Isolated compression of any single chamber — RA, LA, RV, or even the LV or a pulmonary vein — depending on where the clot sits |
Respiratory inflow variation ≥ 25% / ≥ 40% | Present | Frequently absent; the thresholds are unreliable under positive-pressure ventilation and with loculated collections |
IVC | Plethoric | Plethoric, but confounded by ventilation and volume state |
TTE detection | Usually adequate | Frequently invisible — the posterior mediastinum is exactly where TTE cannot see |
Presentation | Progressive | Falling cardiac output, rising filling pressures, rising vasopressor requirement, oliguria, sudden drop in drain output |
A falling chest drain output followed by rising filling pressures and vasopressor requirement is tamponade until TEE proves otherwise. Waiting for a transthoracic study to show a circumferential effusion in this setting is a recognised route to a preventable death.
Practical rule: in a post-cardiac-surgery patient with unexplained low cardiac output, TEE is indicated early and the negative TTE is not reassurance.
Assessment of the surgical result
A baseline postoperative study is mandatory and is the single most valuable document for every subsequent assessment of that patient's prosthesis (Chapter 23). Without it, patient–prosthesis mismatch cannot be distinguished from later obstruction, and structural valve deterioration criteria — which are all defined as change from baseline — cannot be applied.
Procedure | What to document |
Valve replacement | Prosthesis type and size, peak and mean gradient, EOA, Doppler velocity index, indexed EOA (for PPM), presence and location of any regurgitation, LV and RV function |
Mitral repair | Residual regurgitation and its mechanism; systolic anterior motion with LVOT gradient; mean transmitral gradient (an annuloplasty ring can create functional stenosis); ring stability |
Aortic root / Bentall | Coronary button patency, root integrity, AR, pseudoaneurysm |
CABG | New regional wall motion abnormality suggesting graft failure or incomplete revascularisation |
Septal myectomy | Residual LVOT gradient, iatrogenic VSD, new AR |
Congenital / patch repair | Residual shunt, patch integrity |
Any procedure | Pericardial and pleural collections; aortic cannulation site |
Systolic anterior motion after mitral repair
An important and specific complication. A ring that displaces the coaptation point anteriorly, combined with a redundant posterior leaflet and a hyperdynamic, underfilled, catecholamine-stimulated ventricle, produces SAM with dynamic LVOT obstruction and a posteriorly directed regurgitant jet.
Management inverts the standard postoperative response: volume load, reduce or stop inotropes, add a pure vasoconstrictor, and consider beta-blockade. Escalating inotropes for the resulting hypotension worsens the obstruction (Chapter 28). SAM appearing on the table may prompt a return to bypass for revision; SAM appearing in the ICU is usually managed medically first.
Low cardiac output syndrome — the differential
Cause | Distinguishing findings | Action |
Tamponade | Chamber compression, often loculated; falling drain output | Re-exploration |
Hypovolaemia | Small, hyperdynamic ventricles, collapsing SVC/IVC | Volume |
Vasoplegia | High or normal SVI, low Ea, low SVR | Vasopressor; consider methylene blue in refractory cases |
RV failure | Dilated RV, septal shift, high CVP; common after transplant, LVAD, prolonged bypass, or air embolism to the right coronary | Reduce PVR, vasopressor, inotrope, avoid volume |
LV stunning | Global impairment recovering over 24–72 hours | Inotrope, time |
Graft failure / ischaemia | New regional wall motion abnormality in a graft territory | ECG, troponin, angiography |
Dynamic LVOT obstruction / SAM | Dagger-shaped LVOT envelope; worse with inotropes | Volume, vasoconstrictor, stop inotropes |
Prosthetic dysfunction | Elevated gradient, new regurgitation, restricted occluder motion | TEE; Chapter 23 |
Arrhythmia | Loss of AV synchrony; junctional rhythm | Pacing — atrial or dual-chamber, not ventricular alone |
Air embolism to the right coronary | Transient inferior wall motion abnormality, often with bradycardia | Usually self-limiting; raise perfusion pressure |
Aortic complications
Cannulation-site dissection, intramural haematoma, and aortic injury are uncommon but catastrophic. New hypotension with a widened mediastinum, unexplained AR, or a new pericardial effusion after aortic surgery mandates examination of the aorta on TEE (Chapter 16), recognising the distal ascending aorta blind spot.
ICU-Specific Limitations
Confounder | Effect | Response |
Absent TTE windows | Non-diagnostic study | Early TEE; do not repeat inadequate TTEs |
Open chest | Altered loading; the usual tamponade physiology is absent | Direct epicardial imaging is an option intraoperatively |
Pacing (particularly ventricular) | Paradoxical septal motion, apparent dyssynchrony, unreliable septal e′ | Judge function from lateral and posterior segments |
Mechanical support in situ | Non-pulsatile flow; VTI no longer equals systemic output | Chapter 35 |
Recent bypass | Global stunning mimics primary myocardial disease | Serial studies; expect recovery over 24–72 hours |
Mediastinal air | Obscures TTE and can degrade early TEE | Time; TEE views from the transgastric position |
🛑 Critical pitfall: Excluding tamponade on a transthoracic study in a post-sternotomy patient. Loculated posterior clot is exactly what TTE cannot see, and the classic respiratory variation signs are absent under positive-pressure ventilation.
🛑 Critical pitfall: Reporting severe RV dysfunction on the basis of a low TAPSE after pericardiotomy. TAPSE falls acutely and stays low in patients whose global RV function is normal.
🛑 Critical pitfall: Escalating inotropes for postoperative hypotension without excluding SAM after mitral repair. Each dose increment worsens the obstruction.
- 💡 Clinical pearl: A sudden fall in chest drain output followed by rising filling pressures is a tamponade pattern, not an encouraging sign of resolution.
- 💡 Clinical pearl: Perform and archive a baseline prosthetic valve study before the patient leaves the ICU. Every future assessment of that valve depends on it.
- 💡 Clinical pearl: In this population, reach for TEE early rather than after three inadequate transthoracic attempts. The delay is the harm.
References
- Hahn RT, Abraham T, Adams MS, et al. Guidelines for performing a comprehensive transesophageal echocardiographic examination. J Am Soc Echocardiogr 2013;26:921–64.
- Zoghbi WA, Jone PN, Chamsi-Pasha MA, et al. Guidelines for the evaluation of prosthetic valve function with cardiovascular imaging. J Am Soc Echocardiogr 2024;37:2–63.
- Klein AL, Abbara S, Agler DA, et al. ASE clinical recommendations for multimodality cardiovascular imaging of patients with pericardial disease. J Am Soc Echocardiogr 2013;26:965–1012.
- ESC/EACTS. 2025 Guidelines for the management of valvular heart disease. Eur Heart J 2025;46:4635–.