Learning Objectives
- Define transesophageal echocardiography (TEE) and explain how it differs from standard transthoracic ultrasound during CPR
- Summarize the design and key findings of the EXECT-CPR trial (JAMA Internal Medicine, 2026)
- Explain why timing likely limited the effectiveness of TEE-guided CPR in this study
- Identify the evidence-based EMS interventions that remain highest priority in out-of-hospital cardiac arrest
What Is TEE and Why Did It Seem Promising?
Transesophageal echocardiography (TEE) is a type of ultrasound imaging where a probe is passed into the esophagus, the tube connecting the mouth to the stomach. Because the esophagus sits directly behind the heart, TEE provides a clear, unobstructed view of cardiac structures in real time.
During cardiac arrest, TEE offers something traditional point-of-care ultrasound cannot: continuous cardiac imaging without interrupting CPR. Standard transthoracic echo requires pausing compressions to get a usable image. TEE eliminates that problem entirely.
The theory behind TEE-guided CPR was compelling. With real-time cardiac imaging during resuscitation, providers can:
Optimize Compression Location
Visualize the left ventricle directly and position compressions for maximum cardiac output.
Confirm Blood Movement
Watch in real time whether compressions are actually ejecting blood from the ventricles.
Identify Reversible Causes
Immediately detect tamponade, massive PE, or hypovolemia, the reversible H's and T's.
Detect ROSC Earlier
Recognize return of spontaneous circulation before a pulse is palpable and avoid unnecessary post-ROSC compressions.
On paper, TEE seemed like it could meaningfully improve resuscitation quality. The EXECT-CPR trial was designed to find out if that translated into patients actually surviving.
EXECT-CPR Trial: What They Did
This was a randomized controlled trial, the highest level of clinical evidence. Researchers enrolled 132 adult patients with out-of-hospital cardiac arrest who arrived to the emergency department still in arrest. Patients were randomized to one of two resuscitation strategies:
| Group | What They Received |
|---|---|
| TEE-Guided CPR | Continuous TEE imaging used to optimize compression placement and monitor cardiac activity throughout resuscitation |
| Standard CPR | Resuscitation performed per standard ACLS protocols without TEE guidance |
An important detail: TEE was initiated in the emergency department upon arrival, not in the field. The average time from arrest to ED arrival was approximately 30 minutes.
What They Found
| Outcome | TEE-Guided CPR | Standard CPR |
|---|---|---|
| ROSC | 44% | 39% |
| ICU Admission | 30% | 30% |
| Survival to Discharge | No significant difference | No significant difference |
| ETCO₂ | No significant difference | No significant difference |
The small difference in ROSC rates (44% vs 39%) did not reach statistical significance and did not translate into more patients leaving the hospital alive. ETCO₂ values were identical between groups, suggesting CPR quality was similar regardless of TEE guidance.
Why Didn't It Work?
This is the most important question, and the answer has direct implications for how EMS providers think about technology in resuscitation.
Survival from cardiac arrest drops dramatically with time. The longer the arrest, the less likely any intervention, no matter how sophisticated, can reverse the physiological damage already done. TEE can optimize how and where you compress. It cannot:
What TEE Cannot Do
Reverse prolonged ischemia to the brain and vital organs, or restore neurological function lost during a prolonged no-flow state.
Where TEE May Still Help
Earlier in an arrest, in short-transport systems, or for rapid identification of reversible causes. The research window is still open.
This study is not an indictment of TEE as a technology. It is a reminder that even excellent tools have a window of opportunity, and that window may have already closed by the time most OHCA patients reach the ED.
What still moves the needle, at every point in an arrest, are the fundamentals:
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High-Quality CPR Rate 100–120/min · Depth 2–2.4 inches · Full chest recoil · Minimize hands-off time
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Early Defibrillation Every minute without defibrillation for a shockable rhythm decreases survival by 7–10%. Get the monitor on fast.
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Minimal Interruptions Pre- and post-shock pauses as short as possible. Pulse checks brief and purposeful.
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Waveform Capnography Best real-time indicator of CPR quality. ETCO₂ <10 mmHg after 20 min is a poor prognostic sign. Sudden rise may signal ROSC.
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Treat Reversible Causes H's and T's: Hypoxia, Hypovolemia, Hydrogen ion, Hypo/Hyperkalemia, Hypothermia · Tension pneumo, Tamponade, Toxins, Thrombosis
Apply What You Know
You arrive to find a 58-year-old male in cardiac arrest. Bystander CPR was in progress. Initial rhythm is ventricular fibrillation. You defibrillate once with no ROSC. You establish an airway, confirm waveform capnography, and begin transport. ETCO₂ is 28 mmHg. Transport time to the receiving ED is 14 minutes.
Your partner asks if you should call ahead and request TEE guidance upon arrival. Based on the EXECT-CPR trial, what matters most right now?
TEE in cardiac arrest is a genuinely interesting idea and I'll be watching where the research goes. But it's not available in the field yet, and right now this trial tells us it didn't change outcomes even in the ED. What it does reinforce is something we already know: high-quality compressions, early defibrillation, minimal interruptions. Those are the tools you have. Use them well.
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