Chen Y, Lin CH, Jeng MJ. Effects of intratracheal captopril on severely meconium-injured piglet lungs.
J Chin Med Assoc 2019;
82:505-509. [PMID:
30893254 DOI:
10.1097/jcma.0000000000000044]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND
Severe meconium aspiration syndrome (MAS) may cause intractable respiratory failure in neonates. Targeting the renin-angiotensin system may be an effective way to treat such pulmonary dysfunction. Captopril has the potential to mitigate the severity of lung injury by inhibiting angiotensin-converting enzyme.
METHODS
Twelve newborn piglets were intratracheally instilled with human meconium to induce severe MAS and were randomly treated with IT administration of captopril (0.5 mg/kg) (IT-Cap group, n = 6), or sham air instillation (Control group, n = 6). Cardiopulmonary profiles were monitored for a total of 5 hours. Pulmonary history was examined to compare lung injury severity between groups.
RESULTS
There were no significant differences between the two study groups in gas exchange and lung compliance, peak inspiratory pressure, heart rate, and mean arterial blood pressure over the 5-h experimental period, but there were trends toward lower blood pressure and pH in the IT-Cap group. Histopathological examinations revealed significantly higher lung injury scores in the dependent site of the control group than in the nondependent site of the control group and both sites of the IT-Cap group.
CONCLUSION
Intratracheal captopril did not present significant beneficial effects on severe meconium-injured lungs within 5 hours after injury. Further studies with different disease severities and dosing strategies are required.
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