EFFECT OF BODY POSITION (SUPINE,RLD,LLD)ON VENTILATION&GAS EXCHANGE IN UNILATERAL PULMONARY DISEASE.

EFFECT OF BODY POSITION (SUPINE,RLD,LLD)
ON VENTILATION AND GAS EXCHANGE IN
UNILATERAL PULMONARY DISEASE.
( Presented by Dr.R.Vinodha,M.D.,in Indian Assosiation of Biomedical Scientists
XIV annual conference)

Abstract
In normal subjects breathing normally both blood flow and ventilation are greater in dependent lung zones.These considerations may assume clinical importance in unilateral pulmonary disease.This study was undertaken to verify this in patients,thoracic medicine dept, M.M.C.,Chennai.A.B.G Analysis,&ventilatory tests(VC,FEVC,FEV1)Were measured after 15 minutes in each of the 3 positions.(supine,RLD-right lateral decubitus&LLD-left lateral decubitus)This study indicates that body position can influence gas exchange in patients with unilateral lung disease.lying with the disease lung dependent ,resulted in the lowest arterial o2 pressure and worst gas exchange;lying on the good lung resulted in maximal arterial pressure and better gas exchange.The clinical implication of these data are that study of positionally modulated gas exchange in patients with pulmonary disorders can provide potentially useful clinical information as well as test some of the thereotic concepts of gas exchange.Morover the finding of a significant difference in pao2 going from one lateral decubitus position to the other, suggest that lateral positioning of pulmonary patients is not without significant consequence to gas exchange and might advantageously be used in the therapeautic programme.
(fig:1.Radiographic appearance of destroyed lung cavity with fibrosis.
fig:2.Lobectomy.
fig:3.Pneumonectomy.)