Acute lung injury isolated to an in situ lung preparation causes sustained reflex cardiovascular depression in dogs.
We tested the hypothesis that acute lung injury (ALI) isolated to a perfused in situ left lung preparation results in sustained reflex cardiovascular depression. Phorbol myristate acetate (PMA), an agent that activates neutrophils, administered into the isolated lung preparation of chloralose-anesthetized dogs resulted in ALI, as assessed by wet-to-dry weight ratios and histopathology, and significant decreases in heart rate (43%), mean arterial pressure (27%), aortic blood flow (29%) and maximum rate of change in left ventricular pressure (30%). Significant reflex effects occurred by 20 min after PMA administration and were sustained for 40 min (n = 7). Hemodynamic variables recovered when the left lung was denervated 60 min after PMA administration. Indomethacin administered into the isolated circulation before PMA (n = 5) did not significantly influence the ALI or reflex effects. Systemic atropinization (n = 6) prevented only the bradycardia. Left lung denervation before ALI (n = 3) prevented all reflex effects. We conclude that PMA administration into an isolated in situ lung preparation results in ALI and sustained reflex cardiovascular depression that is most likely elicited by pulmonary C-fiber stimulation and mediated by withdrawal of sympathetic efferent nerve activity.
Division of Thoracic and Cardiovascular Surgery, College of Medicine, Ohio State University, Columbus 42310.
D A
DA
Allen
E R
ER
Schertel
S E
SE
Weisbrode
P D
PD
Myerowitz
D000818:Animals; D001285:Atropine / Q000494:pharmacology; D001784:Blood Gas Analysis; D001794:Blood Pressure; D003714:Denervation; D004195:Disease Models, Animal; D004285:Dogs; D006339:Heart Rate; D006439:Hemodynamics; D006863:Hydrogen-Ion Concentration; D007213:Indomethacin / Q000494:pharmacology; D008168:Lung / Q000187:drug effects / Q000294:innervation / Q000473:pathology / Q000503:physiopathology*; D010477:Perfusion; D011460:Prostaglandins F / Q000097:blood; D011897:Random Allocation; D012018:Reflex; D012128:Respiratory Distress Syndrome / Q000139:chemically induced / Q000473:pathology / Q000503:physiopathology*; D013755:Tetradecanoylphorbol Acetate; D017725:Ventricular Pressure
D011460:Prostaglandins F; D001285:Atropine; D013755:Tetradecanoylphorbol Acetate; C100006:prostaglandin F1; D007213:Indomethacin