Abstract
To detect hypoxic pulmonary vasoconstriction (HPV) morphologically, we investigated the pulmonary vascular response to acute hypoxia in 27 patients with chronic pulmonary disease (CPD) and 8 healthy subjects. Pulmonary hemodynamic measurements and magnified pulmonary wedge angiography (MPWA) were carried out before and after inhalation of 13% oxygen in nitrogen for 15 min. The diameters of central arteries (A) and muscular arteries (B) were measured using a densitometric method. Vasoconstriction was detected in the muscular arteries than in the central arteries by MPWA. There was a significant correlation between delta P (changes of mean PA pressure) and delta B/A (changes in diameters of B/A) in the CPD group. A significant correlation was found between delta SvO2 and delta B/A in the control group. We conclude that MPWA was a very useful method for the simple detection of HPV in patients with CPDs and we detected one site of HPV on the ninth generation of the pulmonary arterial tree by MPWA.
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