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. 2003 Jan 20;2003(1):CD003745. doi: 10.1002/14651858.CD003745

Hammerman 1987.

Methods Double blind RCT of indomethacin vs placebo for infants with asymptomatic PDA 
 Blinding of randomisation: Yes 
 Blinding of intervention: Yes 
 Complete follow up: No 
 Blinding of outcome assessment: can't tell
Participants Infants <1000g birth weight with contrast echocardiogram evidence of PDA with left to right shunt at day 3 of life, in the absence of symptoms of left to right shunt. Excluded if congenital cyanotic heart disease, PPHN, or no UAC 
 indomethacin n= 11 
 placebo n= 15
Interventions Indomethacin or placebo 0.2mg/kg for 3 doses, 12 hours apart
Outcomes Chronic Lung disease, Symptomatic PDA, Treated PDA, Length of ventilation, Days of supplemental oxygen
Notes 2 post randomisation exclusions
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Low risk A ‐ Adequate