Focused Bedside Echocardiography: A Working Reference

A hypotensive patient at two in the morning, a probe on the trolley, and nobody else in the hospital who scans. The question is never “please perform an echocardiogram”. It is whether this patient is empty, obstructed, failing or tamponading, and whether the answer changes what you do in the next ten minutes. A focused bedside study answers that class of question extremely well and answers other questions badly, and the difference between a useful scan and a dangerous one is almost entirely about knowing which is which. What follows is a working reference for physicians who scan their own patients without a sonographer or a reporting cardiologist.

The scope of a focused study

A focused study is a binary instrument applied to a small number of large questions: is the left ventricle severely impaired, is the right ventricle acutely strained, is there a pericardial collection causing physiological compromise, is the inferior vena cava full or empty, and is there gross valvular catastrophe. It is not a substitute for a comprehensive study, and it should never generate a diastolic grade, a valve area or a chamber quantification report. Clinicians get into difficulty in one of two ways: by extending a focused study beyond its remit, or by declining to scan at all and managing a shocked patient on inference.

The decision points

1. Decide the question before you pick up the probe

Scanning without a stated question produces incidental findings and no decisions. Write the question down: undifferentiated hypotension, unexplained breathlessness, suspected tamponade, chest pain with haemodynamic compromise, or assessment of volume responsiveness. The question dictates which windows you need, how long the study takes, and what constitutes a negative result.

2. Decide the minimum dataset for that question

For shock, a subcostal four-chamber view, a parasternal long and short axis, an apical four-chamber view and an inferior caval view will answer most of it. Get the subcostal view first in a supine ventilated patient, because it is frequently the only window available and it answers the tamponade question immediately. If two of the four windows are unobtainable, that is itself a result: state the limitation and escalate rather than reporting an impression built on one image.

3. Decide whether visual assessment is sufficient

For acute management, a graded visual estimate of left ventricular function by an experienced eye is accurate enough and far faster than measurement. Severe impairment, hyperdynamic function and normal function are the three categories that change treatment tonight. Reserve formal biplane measurement for the comprehensive study that follows. What visual estimation cannot do is detect the subtle impairment that matters in cardiotoxicity or infiltrative disease, which is a different clinical setting entirely and covered in our echocardiography masterclass.

4. Decide the volume question from more than the caval diameter

Inferior caval size and collapsibility are useful and frequently over-interpreted, particularly in ventilated patients and in isolated right heart disease. Read the cava alongside the size and behaviour of the left ventricle: a small, vigorously emptying ventricle with a collapsing cava supports fluid administration, while a dilated ventricle with a plethoric cava argues against it. Left atrial size adds the chronic dimension, distinguishing an acutely dry patient from one with long-standing elevated filling pressures.

5. Decide whether the right ventricle is acutely strained

In an acutely breathless or shocked patient this is often the highest-yield question on the study. Look for right ventricular dilatation relative to the left, septal flattening, reduced longitudinal excursion at the tricuspid annulus, and regional preservation of apical contraction with a poorly contracting free wall. That last pattern in a hypotensive patient with clear lungs should redirect the entire working diagnosis. Remember that an acutely strained right ventricle cannot generate a high pulmonary pressure, so a modest tricuspid gradient does not exclude a major obstruction.

6. Decide tamponade on physiology, not on volume

Effusion size correlates poorly with haemodynamic significance. A rapidly accumulating small effusion after intervention or trauma can be lethal while a large chronic collection is tolerated. Look for right atrial systolic collapse, right ventricular diastolic collapse, marked respiratory variation in transvalvular inflow velocities, and a dilated non-collapsing cava. In the post-procedural patient, low threshold and rapid escalation matter more than measurement precision, and the emergency sequences are set out in our cardiac emergency reference for emergency physicians.

7. Decide which valve findings change tonight

Chronic valve grading belongs in a comprehensive study. Three findings do belong in a focused one because they alter immediate management: acute severe regurgitation with a normal-sized ventricle in a shocked patient, a large mobile mass on a valve in a febrile patient, and obstructed or dehisced prosthetic material. Colour Doppler across every valve takes thirty seconds and is worth the time even in a focused protocol.

8. Decide when the focused study has reached its limit

The moment your management depends on a number rather than a category, the focused study is over and a comprehensive one is required. The same applies when transoesophageal imaging is likely to be needed, as in suspected endocarditis with negative transthoracic images, prosthetic valve dysfunction, aortic dissection and unexplained embolic stroke. Knowing this boundary is what separates competent bedside imaging from overreach, and our practical echocardiography reference sets out where each modality takes over.

When to escalate, transfer or call for help

• Immediately, during the scan: tamponade physiology, acute severe regurgitation, a mechanical complication after infarction, or a mobile intracardiac mass. These findings need a cardiologist and often a surgeon, not a follow-up appointment.
• Same day: newly severe ventricular impairment, acute right ventricular strain, or a suspected prosthetic valve problem. Treat while arranging the definitive study; the two are not sequential.
• When the windows fail: escalate rather than reassure. An inadequate study in a deteriorating patient is a reason to transfer, not a reason to observe overnight.
• For chronic findings: route to a full study and outpatient assessment, using the diagnosis and imaging hub and the heart failure guide for general physicians to decide what needs to happen before the appointment.

What to document

• The clinical question the study was performed to answer, stated at the top.
• That the study was focused rather than comprehensive, in explicit words.
• Which windows were obtained and which were not.
• Categorical findings rather than measurements: severely impaired, normal, dilated, effusion with or without compromise.
• The action taken as a result, and whether a comprehensive study has been requested and when.
• Images stored and retrievable, since the next clinician will want to compare rather than take your word for it.

Bench card

Three habits that keep bedside scanning safe: state the question in writing before scanning, report in categories rather than numbers, and name every window you could not obtain. Short-form revision notes for physicians who scan occasionally rather than daily are collected in cardiology quick notes for the non-cardiologist and across the echocardiography reference collection. A note-based companion to this material is published as these practical echocardiography quick notes.

Questions from the floor

How much training is needed before scanning unsupervised in an emergency?

Enough supervised studies to recognise a normal heart reliably from several windows, which is a larger number than most short courses provide. Competence in a focused protocol is defined by knowing what you cannot answer, and that judgement develops later than image acquisition does.

Can a focused study exclude pulmonary embolism?

No. It can support the diagnosis in a shocked patient by demonstrating acute right ventricular strain, and it can redirect management immediately when it does. A normal right ventricle does not exclude embolism in a haemodynamically stable patient, and the definitive investigation remains cross-sectional imaging.

Should I report an incidental finding picked up on a focused scan?

Yes, but as an observation requiring confirmation rather than as a diagnosis. Write that it was seen on a focused study, describe it plainly, and request a comprehensive assessment. Silently ignoring it and formally diagnosing it are both errors.

Is handheld equipment adequate for these decisions?

For the categorical questions above, modern handheld devices are largely adequate and vastly better than no imaging. They are not adequate for quantification, for spectral Doppler assessment in most cases, or for anything requiring measurement precision, and reports should name the device used.

Reviewed by Dr A M Thirugnanam, MD, MSICP, FSCAI, Ph.D., Senior Interventional Cardiologist — prepared for physicians who scan their own unstable patients and must act on what they see immediately.