[Perfusion lung scan in unexplained pulmonary hypertension].

Area of Science:

• Cardiology
• Pulmonology
• Radiology

Background:

• Unexplained pulmonary hypertension requires accurate etiological diagnosis.
• Distinguishing between chronic silent pulmonary thromboembolism (CSPT) and primary pulmonary hypertension (PPH) is clinically significant.

Purpose of the Study:

• To evaluate the utility of pulmonary perfusion scanning in differentiating CSPT from PPH in patients with unexplained pulmonary hypertension.

Main Methods:

• Thirty-two patients with unexplained pulmonary hypertension underwent clinical evaluation, hemodynamics, pulmonary angiography, and perfusion lung scanning.
• Pulmonary scan findings were analyzed for perfusion defect patterns.

Main Results:

• Patchy heterogeneous perfusion defects, suggestive of CSPT, were observed in 20 patients (62.5%).
• Normal or equally diffuse radionuclide scattering, indicative of PPH, was seen in 12 patients (37.5%).
• Results correlated with pathological data from relevant literature.

Conclusions:

• Pulmonary perfusion scanning is a noninvasive, safe, and simple method for differentiating CSPT and PPH.
• This diagnostic approach aids in determining the causative factor for unexplained pulmonary hypertension.