Melas Ramo がリツイート

#POCUS #echofirst answer: 1️⃣ Subxiphoid short axis view at the aortic valve level 2️⃣ RVOT Doppler
RVOT Doppler is one of the most underused but high yield tools.
● Tracks RV stroke volume and cardiac output
SV = CSA × VTI
CO = SV × HR
VTI alone works well for serial trends
● Estimates pulmonary vascular resistance
PVR = (TRV ÷ RVOT VTI) × 10 + 0.16
● Screens for pulmonary hypertension even when TR jet is absent
AccT <105 ms suggests PH
AccT ≤60 to 80 ms raises concern for acute PE
● Waveform shape gives physiology
Parabolic is normal
Early peaking and notching suggest rising PVR and help phenotype disease
● Distinguishes acute PE from chronic PH using AccT and notching patterns
● Provides insight into RV pulmonary arterial coupling
RVOT VTI ÷ PASP as a simple coupling metric
● Useful in congenital heart disease
Grading RVOT obstruction and serial follow up after repair
● Tracks response to therapy noninvasively over time
CWD complements PW when velocities are high
● Grades pulmonic stenosis using peak velocity and gradients
Severe if peak gradient >64 mmHg or velocity >4 m/s
● Estimates pulmonary pressures from PR jet
mPAP = 4(V peak PR)² + RAP
PAEDP = 4(V end diastolic PR)² + RAP
● Identifies multi level RVOT obstruction
Double contour envelope suggests infundibular plus valvular disease
● Detects dynamic RVOT obstruction
Late peaking dagger shaped signal
● Enables global RV performance assessment
Tei index combining TR and RVOT flow
● Monitors conduit or bioprosthetic valve gradients over time
NephroPOCUS@NephroP
#POCUS quiz What #echofirst view is this? And where is this Doppler being sampled? #FOAMed #Nephpearls
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