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European Heart Journal 1984 5(11):924-931;
Copyright © 1984 by the European Society of Cardiology.
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© 1984 The European Society of Cardiology

Regional pulmonary blood volume in patients with abnormal blood pressure or flow in the pulmonary circulation

P. WOLLMER, A. ROZKOVEC, C. G. RHODES, R. M. ALLAN and A. MASERI

MRC Cyclotron Unit, Hammersmith Hospital London, U.K.

Received 30 April 1984; revised 18 September 1984; .

Address for Correspondence: Dr Per Wollmer, Department of Clinical Physiology, University of Lund, Lasarettet, S-221 85 Lund, Sweden.

Abstract

We studied the effects of a chronic increase in flow and of chronic hypertension on regional pulmonary blood volume and extravascular lung density (lung tissue and interstitial water per unit thoracic volume) in one group of patients with intracardiac, left-to-right shunt and in another group with Eisenmenger's syndrome or primary pulmonary hypertension. We used positron computerized tomography to measure regional lung density (transmission scans) and blood volume (labelling with 11CO).

The distribution of pulmonary blood volume was more uniform in patients with a chronic increase in pulmonary blood flow than in normal subjects. There were also indications of an absolute increase in intrapulmonary blood volume. In patients with chronic pulmonary arterial hypertension, the regional distribution of blood volume was abnormally uniform, but there were no indications of substantial abnormalities in overall intrapulmonary blood volume.

Key Words: Emission computed tomography • nuclear medicine • pulmonary heart disease • pulmonary circulation • pulmonary hypertension • heart septal defects


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