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The Bloxsom air lock: a historical perspective.
J W Kendig1, P G Maples, M J Maisels
1Department of Pediatrics, Pennsylvania State College of Medicine, Hershey, Pennsylvania, USA. jkendig@psu.edu
Pediatrics
|December 4, 2001
Summary
The Bloxsom air lock (AL) provided positive pressure oxygen for newborns but was later found ineffective for apneic infants. Randomized trials showed no benefit compared to standard care, leading to its decline.
Area of Science:
- Neonatal Resuscitation
- Pediatric History
- Medical Device Evaluation
Background:
- The Bloxsom air lock (AL) was introduced in 1950 for newborn resuscitation, simulating intrauterine pressures.
- It was widely adopted in delivery rooms and nurseries, with clear plastic versions becoming commercially available.
Discussion:
- Early studies questioned the AL's efficacy in oxygenating and ventilating apneic animals and premature infants.
- A 1956 randomized trial found no significant difference in outcomes between the AL and Isolette care.
- Concerns regarding oxygen therapy and retrolental fibroplasia led to the AL's decline.
Key Insights:
- The AL device was not effective for truly apneic infants.
- Randomized controlled trials failed to demonstrate a benefit over standard care.
- The device's use was superseded by evolving understanding of neonatal respiratory support and oxygen toxicity.
Outlook:
- The historical use of the AL highlights the evolution of neonatal resuscitation techniques.
- Understanding the limitations of early devices informs current best practices.
- The case of the AL underscores the importance of rigorous clinical trials in medical device evaluation.