#POCUS#echofirst#Nephpearls
RVOT pulse-wave Doppler can provide useful clues about pulmonary vascular resistance.
In normal individuals (A), the waveform has a smooth, dome-shaped appearance, with peak velocity occurring in mid-systole, reflecting a compliant, low-resistance pulmonary circulation.
As RV afterload increases, the waveform gradually becomes more triangular. The RVOT acceleration time shortens, and the peak velocity shifts earlier into systole (B).
With further increases in pulmonary vascular impedance and reduced arterial compliance, a characteristic mid-systolic notch may appear (C), creating the classic "W sign."
In advanced pulmonary hypertension with RV failure, the Doppler envelope becomes smaller and more abbreviated, with a very short and steep AccT (D). This reflects rapid equilibration of RVOT and proximal pulmonary artery pressures due to severe afterload elevation.
Like most POCUS findings, RVOT Doppler should be interpreted in the context of the overall echocardiographic picture rather than in isolation.
#CardioNuggets™
The Pickelhaube sign is a sharp, spiked high-velocity systolic tissue Doppler signal of the lateral mitral annulus seen in arrhythmic mitral valve prolapse.
It’s named after the old German “Pickelhaube” helmet because the Doppler waveform resembles the helmet’s pointed spike.
Why it happens:
Prolapsing mitral leaflets cause abrupt systolic tugging of the papillary muscles/mitral annulus → creating a tall systolic velocity spike on TDI.
Why it matters:
Suggests arrhythmic MVP
Associated with ventricular arrhythmias/SCD risk
Often seen with bileaflet MVP and mitral annular disjunction (MAD)
Image from @drahmedmohsen85
#CardioNuggets #MedEd #EchoFirst