Document Detail

Increased contractility and impaired relaxation of the left pulmonary artery in a rabbit model of congenital diaphragmatic hernia.
MedLine Citation:
PMID:  23269641     Owner:  NLM     Status:  Publisher    
PURPOSE: Congenital diaphragmatic hernia (CDH) is associated with pulmonary hypertension which is often difficult to manage and a significant cause of morbidity and mortality. Our aim was to study the pulmonary artery reactivity in an animal model of CDH. METHODS: To investigate the reactivity of the aorta and left pulmonary artery in a rabbit model of CDH, we studied the in vitro responses to the α(1)-adrenoceptor agonist phenylephrine (PE) and to both the muscarinic receptor agonist (ACh) and the nitric oxide (NO) donor sodium nitroprusside (SNP). Rabbits underwent surgery at 25 days of gestation. CDH was created in one fetus per horn (n = 8). Remaining fetuses were considered controls (n = 18). At term (30 days), the lung, left pulmonary artery, and aorta were dissected. In a separate group, endothelium was mechanically removed. RESULTS: There were no differences in the contractile and relaxing responses of aorta in all groups. In left pulmonary artery, PE-induced contractions were significantly greater (p < 0.05) in CDH when compared with control group. The increased responsiveness to PE in CDH group was similar to that found in pulmonary artery without endothelium. The ACh-induced pulmonary artery relaxation was markedly reduced in CDH when compared with control group (p < 0.05), whereas no differences were found for SNP. CONCLUSION: Our results show increased contractility and impairment in endothelium-dependent relaxation of pulmonary artery in CDH, mimicking an endothelial dysfunction, with preserved response to endothelium-independent mechanism.
Augusto Frederico Schmidt; Julio Alejandro Rojas-Moscoso; Frances Lilian Lanhellas Gonçalves; Rodrigo Melo Gallindo; Fabíola Zakia Mónica; Edson Antunes; Rebeca Lopes Figueira; Lourenço Sbragia
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-27
Journal Detail:
Title:  Pediatric surgery international     Volume:  -     ISSN:  1437-9813     ISO Abbreviation:  Pediatr. Surg. Int.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8609169     Medline TA:  Pediatr Surg Int     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
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