Document Detail

Outcome of oral sildenafil therapy on persistent pulmonary hypertension of the newborn at Queen Sirikit National Institute of Child Health.
MedLine Citation:
PMID:  22043756     Owner:  NLM     Status:  In-Process    
BACKGROUND: Persistent pulmonary hypertension of the newborn (PPHN) is a common problem in the neonates with a high mortality rate. The prevalence ranges from 0.38-0.99 per 1,000 live births at Queen Sirikit National Institute of Child Health. The survival rate has improved after the advent of high-frequency ventilation and inhaled nitric oxide. However, inhaled nitric oxide is expensive and unavailable in most neonatal centers in Thailand. Sildenafil is a phosphodiesterase inhibitor type 5 that selectively reduces pulmonary vascular resistance and hence may play a role in the treatment of PPHN.
OBJECTIVE: To evaluate effectiveness and short-term side effects of oral sildenafil for infants > 36 weeks gestational age who have PPHN.
MATERIAL AND METHOD: The present study was conducted between January 2006 and December 2008 in the neonatal intensive care unit (NICU) at Queen Sirikit National Institute of Child Health. All infants > or = 36 weeks gestational age who were diagnosed as PPHN by echocardiogram and had an oxygenation index > or = 20 were included in the study. Oral sildenafil was given as per study protocol with a starting dose of 0.25-0.5 mg/kg/dose. Oxygenation index (OI), oxygen saturations (SpO2), alveolar arterial oxygen gradient (A-aDO2) and mean arterial blood pressure (MAP) were monitored serially.
RESULTS: A total of 40 infants were diagnosed with PPHN during this period. Eleven infants were included in the present study. The initial median OI was 31.95 (24.25-48.25). All infants received standard therapy with mechanical ventilation, sedation and inotropic drugs. OI decreased 4.6% from base line after the first hour of starting oral sildenafil and progressively decreased by 13%, 27%, 37%, 41% and 90% at 2, 4, 6, 12 and 24 hours respectively. Oral sildenafil was discontinued in one infant. It was combined with inhaled iloprost in 2 infants due to systemic hypotension and with inhaled nitric oxide in one infant due to deterioration. One infant died during the present study.
CONCLUSION: Oral sildenafil may be effective in improving oxygenation in some infants with persistent pulmonary hypertension of the newborn. Systemic hypotension was a cause for concern in the present study. Further studies are needed to assess the pharmacokinetics, efficacy and long-term side effects of this drug.
Meera Khorana; Thanatda Yookaseam; Thanarat Layangool; Wiboon Kanjanapattanakul; Hathaitip Paradeevisut
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the Medical Association of Thailand = Chotmaihet thangphaet     Volume:  94 Suppl 3     ISSN:  0125-2208     ISO Abbreviation:  J Med Assoc Thai     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-11-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7507216     Medline TA:  J Med Assoc Thai     Country:  Thailand    
Other Details:
Languages:  eng     Pagination:  S64-73     Citation Subset:  IM    
Neonatal Division, Department of Pediatrics, Queen Sirikit National Institute of Child Health, College of Medicine, Rangsit University, Bangkok, Thailand.
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