Abnormalities in jugular venous flow velocity in pulmonary hypertension.

Doppler recordings of jugular venous flow velocity previously performed in this laboratory in patients with pulmonary hypertension had shown variations from the normal dominant systolic flow (SF) greater than diastolic flow (DF), to SF = DF, SF less than DF or DF alone. The mechanisms underlying these flow alterations were studied in 25 patients and correlated with hemodynamics. The patients with abnormal flow patterns had increased right atrial V-wave pressures. This was associated with an increased right ventricular early diastolic pressure. The incidence of clinical heart failure was higher in patients with SF less than DF or DF alone (8 of 11) compared with 5 of 10 patients with SF = DF. Thus, in patients with pulmonary hypertension, the abnormal jugular venous flow patterns appear to be caused by both an increased DF velocity and a decrease in SF velocity. Because the right atrial V-wave pressures were similar in patients with both SF = DF and SF less than DF or DF alone and the incidence of heart failure was higher in the latter, the decrease in SF must be a later phenomenon. Serial observations confirmed this temporal sequence. The applicability of these observations to bedside evaluation of patients with pulmonary hypertension is emphasized.