Analysis of pulmonary microvascular permeability after smoke inhalation.
We estimated the reflection (sigma) and filtration coefficients (Kf) in a chronic sheep lung lymphatic preparation after smoke inhalation. Group I (n = 7) sheep were insufflated with cotton smoke and group II animals (n = 5) with room air. After inhalation injury, the lung lymph flow increased nearly four times the baseline value by 24 h after injury. There was a concomitant reduction of sigma (0.81 +/- 0.02 to 0.64 +/- 0.02) and elevation of Kf (0.020 +/- 0.002 to 0.042 +/- 0.009 ml.min-1.mmHg-1); pulmonary capillary pressure was also elevated (13 +/- 1 to 17 +/- 1 mmHg). By 48 h postinjury, sigma and Kf returned toward baseline but pulmonary capillary pressure was still elevated. We determined that 34% of the increase in capillary filtration was attributable to increased capillary pressure and 66% to increased permeability 24 h after inhalation, but 48 h after injury, 75% of the increase in capillary filtration was attributable to increased capillary pressure and 25% to increased permeability. We conclude that the lung edema formation following smoke inhalation is the result of marked increases in both capillary pressure and permeability.
Isago
T
T
Department of Anesthesiology, University of Texas Medical Branch, Galveston 77550.
Noshima
S
S
Traber
L D
LD
Herndon
D N
DN
Traber
D L
DL
D000758:Anesthesia; D000818:Animals; D001794:Blood Pressure / Q000502:physiology; D002199:Capillary Permeability / Q000502:physiology*; D005260:Female; D008208:Lymphatic System / Q000503:physiopathology; D008833:Microcirculation / Q000502:physiology; D011652:Pulmonary Circulation / Q000502:physiology*; D011654:Pulmonary Edema / Q000503:physiopathology; D011667:Pulmonary Veins / Q000502:physiology; D012756:Sheep; D015208:Smoke Inhalation Injury / Q000503:physiopathology*