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. 2011 Sep 7;2011(9):CD001453. doi: 10.1002/14651858.CD001453.pub2

Singhal 1983.

Methods Blinding of randomization: yes 
 Blinding of intervention: yes 
 Complete follow up: unclear 
 Blinding of outcome: yes 
 Double blind trial; cross‐over design with pooled data 
 No washout period documented
Participants Patients entered into the study: n=10 
 Entry criteria: BPD. 
 Ten patients were randomized. Postnatal age ranged between 23 and 101 days, and average FiO2 was 0.27±0.13. Baseline compliance during the furosemide period tended to be 26% lower than during the placebo period (1.14±0.79 ml/cm vs 1.55±1.04 ml/cm, respectively, NS).
Interventions Furosemide vs placebo 
 Patients were randomly allocated to receive either furosemide 1.5 mg/kg IM q 12 hours for 3 doses, or placebo.
Outcomes Main outcome: compliance and ventilation. 
 The authors report that furosemide produced a significant increase in compliance, a 6‐fold increase in urine output, an increase in serum solids and no significant change in serum Na and K concentrations. 
 Compliance was 1.38±0.79 ml/cm after the third dose of furosemide, compared with 1.54±0.98 after the third dose of placebo. We found no significant difference between the two periods in compliance expressed in % of baseline.
Notes (1) Abstract form only; incomplete information available. Standard error was mentioned for compliance but not for other variables. 
 (2) Neither 'random', 'randomized' or 'randomly' is mentioned in the text. Nevertheless, this is a double‐blind clinical trial, so that the we assumed this was a randomized trial. 
 3) Compliance was measured 2 hours after the third dose of furosemide.
Risk of bias
Bias Authors' judgement Support for judgement
Random sequence generation (selection bias) Unclear risk Double blind trial; cross‐over design with pooled data
Allocation concealment (selection bias) Low risk Blinding of randomization: yes
Blinding (performance bias and detection bias) 
 All outcomes Low risk Blinding of intervention: yes 
 Blinding of outcome: yes
Incomplete outcome data (attrition bias) 
 All outcomes Unclear risk Complete follow up: unclear