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Fig. 1 | The Ultrasound Journal

Fig. 1

From: Pulmonary artery acceleration time accuracy for systolic pulmonary artery pressure estimation in critically ill patients

Fig. 1

Pulmonary artery acceleration time (PAAT, dashed red line) and right ventricular ejection time (RVET, yellow brace) measurement in parasternal short-axis view (A) and subcostal view (B). PAAT is calculated as the time interval between the onset of systolic pulmonary artery flow and its peak flow velocity; RVET is measured from the onset to the end of pulmonary artery Doppler spectrum. For further adjustment, sPAP was derived on the basis of the linear correlation linking PAAT to TRVmax as follows: log10(sPAP) = −0.004 (PAAT) + 2.1 [8]. Mean PAP (mPAP) can be estimated using the following formulae proposed by Dabestani et al. [28]: if PAAT ≥ 120 ms, mPAP = 79 – (0.45 * PAAT); if PAAT < 90 ms, mPAP = 90 – (0.62 * PAAT)

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