Evaluating infant positioning for lumbar puncture using sonographic measurements.

Objectives: Hypoxia has been observed when infants undergo lumbar puncture in a tight flexed lateral recumbent position. This study used sonographic measurements of lumbar interspinous spaces to investigate the anatomic necessity and advantage derived from this tight flexed positioning in infants.

Methods: This was a brief, prospective, observational study of a convenience sample of patients.