About the Pressure Waveform ID (Image) question bank
A pressure tracing tells you where the catheter is and what is wrong with the heart it sits in. This bank shows you tracings and asks both questions. You will identify chambers by their waveform signature, catch the moment a catheter crosses a valve, and read the pathology written into the wave.
The patterns are finite and learnable. A ventricularised aortic tracing, a giant v wave, equalised diastolic pressures with a dip-and-plateau, a blunted y descent in tamponade — each one has a mechanism, and once the mechanism is clear the tracing becomes obvious rather than memorised.
What this bank covers
- Identifying RA, RV, PA, PCWP, LV, and aortic tracings on sight
- The a, c, and v waves and the x and y descents
- Giant v waves in mitral regurgitation
- Cannon a waves and AV dissociation
- Tamponade — pulsus paradoxus and the blunted y descent
- Constriction — the square-root sign and diastolic equalisation
- Aortic stenosis gradients and pulsus parvus et tardus
- Catheter pull-back tracings and transvalvular gradients
How to use it
- Learn each waveform by its mechanism, not its shape. Shape is what you recall; mechanism is what you reason with.
- Use the interactive pressure waveform atlas below — it animates all sixteen of these conditions against a synced ECG, which makes the timing of each wave obvious.
- Always ask which part of the cardiac cycle the abnormality sits in. That alone narrows the answer.
Frequently asked questions
What causes a giant v wave?
Regurgitant flow into an atrium during ventricular systole. On the wedge tracing it points to mitral regurgitation; on the RA tracing, to tricuspid regurgitation. A very large v wave can even ventricularise the wedge tracing.
What is the square-root sign?
The dip-and-plateau of ventricular diastolic pressure seen in constrictive pericarditis and restrictive cardiomyopathy — rapid early filling that abruptly stops as the stiff pericardium or myocardium halts it.
Why is the y descent blunted in tamponade but steep in constriction?
In tamponade the pericardial fluid restricts filling throughout diastole, so early filling never gets going and the y descent is blunted. In constriction early filling is rapid and unimpeded until the pericardium catches, producing a steep y descent that stops abruptly.