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Macitentan treatment retards the progression of established pulmonary arterial hypertension in an animal model.
MedLine Citation:
PMID:  25305681     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
BACKGROUND: Macitentan is a new endothelin receptor antagonist that is used to treat pulmonary arterial hypertension in humans. Treatment of established pulmonary hypertension with macitentan was studied using the monocrotaline model of pulmonary hypertension.
METHODS: Three groups of rats were created (n=12): control (CON: macitentan only), monocrotaline (MCT: monocrotaline only) and macitentan (MACI: macitentan and monocrotaline). Monocrotaline (60mg/kg) was injected in the MCT and MACI groups on day 0; volume matched saline was injected in the CON groups. Macitentan therapy (30mg/kg/day) was commenced on day 11 in the CON and MACI groups. Serial echocardiography and ECGs were performed. The rats were sacrificed if they showed clinical deterioration.
RESULTS: The MCT and MACI rats showed signs of pulmonary hypertension by day 7 (maximum pulmonary velocity, CON 1.15±0.15m/s vs MCT 1.04±0.10m/s vs MACI 0.99±0.18m/s; p<0.05). Both the MCT and MACI groups developed pulmonary hypertension, but this was less severe in the MACI group (day 21 pulmonary artery acceleration time, MCT 17.55±1.56ms vs MACI 22.55±1.00ms; pulmonary artery deceleration, MCT 34.72±3.72m/s(2) vs MACI 17.30±1.89m/s(2); p<0.05). Right ventricular hypertrophy and QT interval increases were more pronounced in MCT than MACI (right ventricle wall thickness, MCT 0.13±0.1cm vs MACI 0.10±0.1cm; QT interval, MCT 85±13ms vs MACI 71±14ms; p<0.05). Survival benefit was not seen in the MACI group (p=0.50).
CONCLUSIONS: Macitentan treatment improves haemodynamic parameters in established pulmonary hypertension. Further research is required to see if earlier introduction of macitentan has greater effects.
Authors:
I P Temple; O Monfredi; G Quigley; H Schneider; M Zi; E J Cartwright; M R Boyett; V S Mahadevan; G Hart
Publication Detail:
Type:  Journal Article     Date:  2014-10-11
Journal Detail:
Title:  International journal of cardiology     Volume:  177     ISSN:  1874-1754     ISO Abbreviation:  Int. J. Cardiol.     Publication Date:  2014 Dec 
Date Detail:
Created Date:  2014-12-03     Completed Date:  -     Revised Date:  2014-12-04    
Medline Journal Info:
Nlm Unique ID:  8200291     Medline TA:  Int J Cardiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  423-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2014. Published by Elsevier Ireland Ltd.
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