The monitors and echo station: format and timing

Why examiners ask this

This is the one OSCE station where nobody talks back to you. Three timed scenarios play on a screen with a facilitator in the room, a question follows each, and you have roughly 60 seconds to answer before the next clip starts; published practice modules built to the ABA timing use exactly this structure, with a monitor that moves from baseline to an altered state over about a minute and two questions: the most likely diagnosis and the features that support it.^1,2 It tests whether you can read a monitor or an echo loop the way a consultant does at the head of the bed: name the finding, name the cause, say what you do. It stresses application of knowledge and organization; there is no credit for adaptability because there is no dialogue to adapt to.

The 60-second answer

Decision points and the "why"

• Read the context card before the clip — the card tells me the case (sitting craniotomy, laparoscopy, cardiac bypass) and that context ranks my differential before I see a single waveform. The same capnography drop means embolism in a sitting case and disconnect in a prone one.
• Name the parameter and the direction, not the diagnosis first — a candidate who says "air embolism" before saying "the end-tidal CO2 fell" has skipped the step that earns the point. The grader is checking that I recognized the monitor change.
• One physiology sentence — the facilitator's question is often "what is the most likely cause?"; the answer is one mechanism, not a list. I give the most likely cause and the single most dangerous alternative.
• Action in order of what kills first — oxygen, circulation, call for help, specific therapy. If the clip shows a rhythm, I say whether I would shock it. If it shows a pressure, I say the number I am treating toward.
• Echo clips get a view statement first — the outline names 11 standard TEE views plus point-of-care views, two-dimensional with or without color flow and M-mode, and no pulsed-wave or continuous-wave Doppler;³ "this is a midesophageal four-chamber view" or "subcostal view" precedes any finding, because the facilitator is grading whether I can orient on the screen. Then the chamber, then the abnormality.
• Silence is allowed — a wrong guess in the first five seconds costs more than a four-second pause. I watch the whole loop before I open my mouth.

The complication they will inject

The third scenario combines a monitor and an echo. The screen shows a falling blood pressure, a rising central venous pressure, and a transgastric short-axis view with a small, hyperdynamic left ventricle and a dilated right ventricle. The trap is answering only half. I say the monitor finding (hypotension with high filling pressures), the echo finding (right ventricular dilation with a flattened septum and an underfilled left ventricle), and the unifying diagnosis (acute right ventricular failure from pulmonary embolism or air). Then the action: 100% oxygen, inotropic support with epinephrine, avoid fluid loading an already full right heart, and call for help. The other version of the inject is a clip where the image quality is poor or the loop is shorter than I expected. I state what I can see, name what I cannot exclude, and say the next view or monitor I would ask for; that answer scores better than an invented finding.

Pitfalls that cost points

• Talking over the clip and missing the second half of the change.
• Diagnosing before describing; the finding is the scored item.
• Giving a differential of six when the question asked for the most likely cause.
• Forgetting the context card and answering as if the patient were healthy.
• Running out of time on the action step because the physiology explanation ran long.

Rapid-why

Q: How long do I have per scenario? A: About 60 seconds per question; the whole station is up to 8 minutes, with 4 minutes to study the stem beforehand and a two-minute warning bell at 6 minutes.²

Q: Will the clip replay if I ask? A: Do not count on it. Practice modules modeled on the station never allow going back,¹ so I watch first and speak second.

Q: Does the facilitator respond to my answer? A: Do not expect it. Sessions are recorded for grading,² and the station is not a dialogue, so I do not wait for a nod.

Q: What if I cannot identify the echo view? A: I describe the structures I can see, the chamber orientation, and the abnormality, then name the most likely view; partial credit for a correct finding beats silence.

Numbers to know

Links

• OSCE day: stations, timing, who is in the room, Monitor atlas: perioperative cardiac events, Monitor atlas: perioperative respiratory events, Capnography: waveforms and sudden loss of ETCO2
• Atlas: The 11 TEE views; The 5 POCUS cardiac views
• ABA APPLIED Examination OSCE content outline (current edition)