RT Journal Article SR Electronic T1 Ventilation/Perfusion Mismatch Caused by Positive Pressure Ventilatory Support JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1268 OP 1270 VO 30 IS 7 A1 Chun K. Kim A1 Sydney Heyman YR 1989 UL http://jnm.snmjournals.org/content/30/7/1268.abstract AB