The effect of steroids on adaptation to atelectatic shunting

M. L. Schwartz, W. F. Northrup, D. M. Nicoloff, E. W. Humphrey

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4 Scopus citations


The effect of pharmacological doses of steroids on pulmonary vascular shunting (Qs/Qt) and fractional pulmonary capillary perfusion (FPCP) following left lower lobe atelectasis (LLLA) was studied in four groups of dogs. LLLA alone resulted in an increase in Qs/Qt. This was followed by a decrease in the blood flow to that lobe so the increased shunting had been essentially corrected after 2 hr. Methylprednisolone (35 mg per kg) prevented this decrease in shunting which occurs after LLLA but the same dose of methylprednisolone failed to affect the pulmonary vascular hypertensive response to ventilation with 8% O2. It is postulated that this steroid acts to partially desensitize the chemoreceptors of the lung to all types of stimuli.

Original languageEnglish (US)
Pages (from-to)822-829
Number of pages8
JournalJournal of Thoracic and Cardiovascular Surgery
Issue number5
StatePublished - 1974
Externally publishedYes


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