Ragweed sensitization alters pulmonary vascular responses to bronchoprovocation in beagle dogs

Andreas Theodorou, Natalie Weger, Kathleen Kunke, Kyoo Rhee, David Bice, Bruce Muggenberg, Richard Lemen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

In ragweed (RW)-sensitized beagle dogs, we tested the hypothesis that reactivity of the pulmonary vasculature was enhanced with aerosolized histamine (Hist) and RW. Seven dogs were neonatally sensitized with repeated intraperitoneal RW injections, and 12 dogs were controls (Con). The dogs were anesthetized with intravenous chloralose, mechanically ventilated, and instrumented with femoral arterial and pulmonary artery catheters. Specific lung compliance (CL(sp)), specific lung conductance (G(sp)), systemic vascular resistance index, and pulmonary vascular resistance index (PVRI) were measured before and after bronchoprovocation with Hist and RW. After Hist inhalation (5 breaths of 30 mg/ml), both Con and RW dogs had significant (P < 0.05) decreases in CL(sp) (-51 ± 4 and -53 ± 5%, respectively) and G(sp) (-65 ± 5 and -69 ± 3%, respectively), but only RW-sensitized dogs had a significant increase in PVRI (38 ± 10%). After RW inhalation (60 breaths of 0.8 mg/ml), only RW-sensitized dogs had significant increases (62 ± 20%) in PVRI and decreases in G(sp) (-77 ± 4%) and CL(sp) (-65 ± 7%). We conclude that, compared with Con, RW-sensitized beagle dogs have increased pulmonary vasoconstrictive responses with Hist or RW inhalation.

Original languageEnglish (US)
Pages (from-to)912-917
Number of pages6
JournalJournal of Applied Physiology
Volume83
Issue number3
DOIs
StatePublished - Sep 1997

Keywords

  • Airway reactivity
  • Asthma
  • LabView
  • Pulmonary circulation
  • Pulmonary hypertension

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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