O'Leary JM, Assad TR, Xu M, Farber-Eger E, Wells QS, Hemnes AR, Brittain EL. Lack of a Tricuspid Regurgitation Doppler Signal and Pulmonary Hypertension by Invasive Measurement. Journal of the American Heart Association. 2018 Dec 30;7(7). PMID: 29960993 [PubMed] PMCID: PMC6064901
Transthoracic echocardiography (TTE) is used to estimate pulmonary artery systolic pressure, but an adequate tricuspid regurgitation velocity (TRV) needed to calculate pulmonary artery systolic pressure is not always present. It is unknown whether the absence of a measurable TRV signifies normal pulmonary artery pressure.