Adult Echocardiography (AE) common mistakes
Adult Echocardiography (AE) · Understand the traps and how to avoid them.
Selecting pulsed-wave (PW) Doppler to interrogate a high-velocity jet (e.g., aortic stenosis, tricuspid regurgitation) and then reporting the aliased waveform's peak velocity or gradient as the true value.
PW is the default 'measurement' mode on many presets and looks cleaner, and candidates forget that the Nyquist limit for cardiac PW at typical depths is only ~1.5-2 m/s, so the envelope wraps and the reported number is falsely low.
What to do instead
Decide mode by expected velocity before you measure: PW (with sample volume) for localization and low-velocity flow, CW for any jet likely to exceed ~1.5-2 m/s. If the spectral display wraps or shows a cut-off envelope, switch to CW, and shift to a non-imaging/ Pedoff probe if the signal is weak. Always scan the full envelope, not the brightest edge.
Measuring peak velocity or gradient with the Doppler cursor visibly off-axis to the flow, or applying an angle-correction value to a cardiac jet to 'fix' a low reading.
On an apical window the cursor often appears aligned when it is 20-30 degrees off the true jet; candidates also carry over the vascular habit of angle correction. Cosine error means a 30-degree misalignment underestimates velocity by ~13% and gradient by ~25%.
What to do instead
Interrogate from at least two windows, align the cursor with the colour/spectral core of the jet, and accept only signals that are crisp, dense, and have a clean, fully filled envelope. Do not angle-correct cardiac Doppler; instead reposition the patient, probe, or window until alignment is achieved.
Mixing peak and mean values: substituting the 4v-squared peak gradient for the mean gradient in severity calls, or pairing an LVOT peak velocity with an aortic VTI (or vice versa) in the continuity equation.
Peak and mean gradients are both printed on the report and look interchangeable; the continuity equation's 'VTI' and 'Vmax' boxes sit next to each other on the machine. The arithmetic still produces a number, so nothing flags the error.
What to do instead
State explicitly which parameter you are reporting. Use mean gradient (traced, averaged over the cardiac cycle and over several beats in irregular rhythms) for severity and for aortic valve area by continuity, and use peak velocity/Vmax consistently in the continuity equation: AVA = (LVOT area x LVOT VTI)/AV VTI, or the Vmax/VTI-matched equivalents.
Measuring the LVOT diameter from a non-zoomed parasternal view, at the level of the aortic sinuses or too far apically, in early systole, or edge-to-edge including the bright endocardial echoes.
The LVOT is small and poorly seen on a standard zoomed-out long-axis; the sinuses are more conspicuous than the annulus, and end-systolic frames look 'fuller'. Because LVOT diameter is squared, a 2 mm error changes valve area by roughly 10-15%.
What to do instead
Zoom on the LVOT in the parasternal long axis, place calipers inner-edge to inner-edge about 0.5-1 cm proximal to the aortic annulus, at mid-systole, with the measurement perpendicular to the long axis. Average over 3 beats and recheck that the same level was used for the VTI sample.
Taking apical views in which the true LV apex is cut off or the chamber is foreshortened, then measuring volumes, ejection fraction, and longitudinal strain from those images.
Foreshortening still produces a plausible-looking four-chamber and a number comes out of the machine, so there is no visible alarm. Candidates chase the mitral valve and forget to drop the transducer intercostally to open up the apex.
What to do instead
Before measuring, confirm the apex sits at the top of the sector with the cavity maximally open and the LV longer than the RV in the four-chamber; move the probe laterally and intercostally, and use the 'longest chamber' view. If the apex cannot be obtained, state that EF is qualitative/limited rather than reporting a foreshortened biplane number.
Grading mitral or aortic regurgitation predominantly from colour jet area or jet length, ignoring vena contracta, PISA/flow convergence, jet density, pressure half-time, and pulmonary vein or aortic flow reversal.
Colour jet area is the most visually striking feature and is easy to eyeball; candidates under-weight the fact that jet area depends heavily on gain, Nyquist limit, driving pressure, and machine preset.
What to do instead
Grade severity with the integrative multiparametric approach: measure vena contracta in the zoomed view at the narrowest neck, calculate PISA radius and regurgitant volume/EROA, assess CW jet density and timing, look for flow reversal, and compare with chamber size. Report colour jet area only as supportive.
Leaving 2D or colour gain too high (or too low), producing tissue 'blooming' into the cavity, colour bleed across valves, or invisible structures, and then making measurements from those images.
Gain is usually set on a previous patient and not re-titrated; excessive gain makes walls feel 'well seen' and colour jets look bigger, which quietly biases wall thickness and regurgitation estimates.
What to do instead
Set 2D gain so the cavity is echo-free while the endocardial border stays distinct, and colour gain just below the point where speckle noise appears in the blood pool. Re-titrate gain and Nyquist limit for every patient and every window, and never compare colour jet sizes acquired at different colour scales.
Assigning a diastolic function grade from the E/A ratio alone, without tissue Doppler e', E/e', left atrial volume index, or tricuspid regurgitation velocity.
E/A is the first number on the mitral inflow display and behaves 'textbook' in normal patients, so pseudo-normal and restrictive patterns get missed. Candidates also forget that E/A varies with heart rate, rhythm, and loading.
What to do instead
Use the full algorithm: measure septal and lateral e' and average, compute E/e', index LA volume, take TR velocity and right atrial pressure, and apply the grading scheme in the correct order. Recheck grade in atrial fibrillation and after loading changes, and state the parameters used.
Mislabelling a pericardial effusion as pleural, or calling tamponade from a large effusion without demonstrating chamber collapse, respiratory inflow variation, or inferior vena cava plethora.
Fluid on the posterior aspect is easy to see but its anatomic relation to the descending aorta (pericardial anterior to it, pleural posterior) is a detail candidates do not routinely check; 'big effusion' is conflated with 'tamponade'.
What to do instead
Confirm location relative to the descending aorta and the pericardial reflection, then look for the physiological markers: right atrial systolic collapse, right ventricular diastolic collapse, >25-30% mitral inflow respiratory variation, and a dilated non-collapsing IVC. Grade by size plus haemodynamic impact, not size alone.
Measuring LV chamber dimensions or wall thickness from an M-mode cursor that is not perpendicular to the LV long axis (or from a 2D-guided line that drifts off the minor axis), then reporting those numbers as septal/lateral dimensions.
The M-mode cursor is left where it happened to be, the tracing looks crisp even when oblique, and oblique cuts slice the ventricle at an angle that overstates both cavity size and wall thickness.
What to do instead
Use 2D-guided M-mode, placing the cursor through the chamber just beyond the mitral leaflet tips, perpendicular to the septal-posterior axis and clearly through the LV centre. Confirm with a visual check on the 2D image that the line crosses the minor axis, and prefer 2D measurements when the ventricle is dilated or distorted.