SummaryDo not attempt resuscitation (DNAR) orders are a formal expression of the intention to refrain from resuscitation. Since their inception in 1974, such orders have become widely accepted within the hospital setting. However, their acceptance in theatres where anesthesia may cause cardiovascular instability, outcomes from cardiac arrest are improved and when there is a cross-over of techniques between anesthetic practice and resuscitation, has been more problematic. In order to ascertain the opinions on DNAR orders in the perioperative period, a questionnaire was sent to all consultant members of the Association of Paediatric Anaesthetists of Great Britain and Ireland, which asked about DNAR orders, resuscitation under anesthesia and included a number of case studies. Of the 280 respondents, 160 (57.1%) agreed that an anesthetist could alter the order in the perioperative period with 41 (14.6%) stating that they would always suspend such an order. Most anesthetists agreed that they would discuss DNAR orders during their preoperative assessment but could not agree as to which interventions constituted normal anesthetic practice as opposed to resuscitation. At present, there is variation in practice between pediatric anesthetists over suspension of DNAR orders in the perioperative period and no specific guidelines to refer to. We suggest that guidelines be produced and that these should take into account the work that has already taken place and guidelines published by other anesthetic communities.

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Our objective was to examine factors that affect the accuracy of energy expenditure measurements (EE), when using flow-through indirect calorimetry (IC), to determine the minimum length of time needed to measure 24- and 48-h EE and to compare cross-over and parallel designs as methods of investigation during energy balance collections (EB) in preterm infants. A baby doll manikin was used to determine equilibration times and to compare VCO(2) and VO(2) as measured by flow meter and indirect calorimetry under different study conditions, one of which simulated an EB. "Continuous" EE was measured to determine the minimum length of time needed to accurately reflect 24- and 48-h EE and to compare parallel and cross-over studies as methods of study design in a group of "normal" enterally fed preterm infants. The mean (+/-SD) errors between flow meter and indirect calorimetry determinations for VCO(2) and VO(2) were -1.9 +/- 2.5 and -1.8 +/- 4.3% under conditions that simulated an EB. Cumulative 6-h EE accurately predicted 24- and 48-h EE. Expressed in absolute terms (kcal/d), EE did not change on a day-to-day basis but did increase over the 2-wk study period. Expressed on body weight basis (kcal/kg/d), EE did not change on a day-to-day or week-to-week basis. The variance in EE due to biologic variability; i.e. the parallel design, was approximately 6 times greater than that due to age, weight, and weight gain; i.e. the cross-over design. Indirect calorimetry, therefore, accurately measures EE in conditions simulating an energy balance collection. Six-hour EE determinations are valid estimate of EE during a 48-h balance collection, while cross-over studies may be the preferred method of study design during short-term studies of EE in preterm infants.

Transient 5-oxoprolinuria is a phenomenon that is well recognised in adults. We illustrate an unusual paediatric case of transient 5-oxoprolinuria presenting during an episode of severe sepsis with concomitant paracetamol use. The 15-month-old patient had an extremely high anion gap metabolic acidosis. Adequate resuscitation failed to correct the biochemical disturbance, and high levels of 5-oxoproline were identified. A combination of haemofiltration, replenishment of glutathione stores with N-acetylcysteine and cessation of paracetamol administration resulted in the resolution of the acidosis. Subsequent testing following treatment of the sepsis revealed no ongoing 5-oxoprolinuria.Conclusion: Transient 5-oxoprolinuria has been previously reported in the adult population during episodes of severe sepsis and various pharmaceutical interventions. This case illustrates that it is a phenomenon that should be considered in paediatric patients where a very high anion gap metabolic acidosis exists that cannot be explained by the biochemical indices.