The HMD helped anesthesiologists detect events when physically constrained, but not when physically unconstrained. Although there was no conclusive evidence of worsened inattentional blindness, found in aviation, the perceptual properties of the HMD display appear to influence whether events are detected. Anesthesiologists wearing HMDs should self-adjust the focus to minimize eyestrain and should be aware that some changes may not attract their attention. Future areas of research include developing principles for the design of HMDs, evaluating other types of HMDs, and evaluating the HMD in clinical contexts.

Para-methoxyamphetamine (PMA) is a substituted synthetic amphetamine used in the recreational drug scene. It is unusual because of the high incidence of significant morbidity and mortality in overdose. We report a case of PMA overdose in South Australia, and review our experience with the drug. We review the literature on PMA overdose and offer suggestions on the management of overdose with this dangerous drug.