🫀 PAAT to PASP Calculator

Scroll to select your PAAT measurement

Pulmonary Artery Acceleration Time (PAAT)

PAAT

139 msec

→

PASP

35.0 mmHg

Elevated (PH Threshold)

About: This calculator estimates peak pulmonary artery systolic pressure (PASP) from pulmonary artery acceleration time (PAAT). Particularly useful when tricuspid regurgitation is absent or insufficient.

Formula: log₁₀(PASP) = -0.004(PAAT) + 2.1

Clinical Context: PAAT < 139 msec suggests PASP ≥ 35 mmHg (pulmonary hypertension threshold).

📖 How to Measure PAAT

Parasternal short axis view showing sample volume placement

Step 1: Obtain parasternal short-axis view and place pulsed-wave Doppler sample volume at the pulmonic valve annulus

Doppler waveform showing PAAT measurement

Step 2: Measure the time between onset of systolic PA flow and peak velocity

⚠️ Clinical Use Warning: For educational purposes only. Clinical decisions should not be based solely on this calculation. Validation range: PAAT 43-186 msec, PASP 19-102 mmHg.

Reference: Yared K, Noseworthy P, Weyman AE, McCabe E, Picard MH, Baggish AL. Pulmonary Artery Acceleration Time Provides an Accurate Estimate of Systolic Pulmonary Arterial Pressure during Transthoracic Echocardiography. J Am Soc Echocardiogr. 2011;24:687-92.