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This Month in Anesthesiology  |   May 2010
THIS MONTH IN Anesthesiology 
Article Information
This Month in Anesthesiology
This Month in Anesthesiology   |   May 2010
THIS MONTH IN Anesthesiology 
Anesthesiology 5 2010, Vol.112, 9A. doi:10.1097/01.anes.0000371662.09351.1e
Anesthesiology 5 2010, Vol.112, 9A. doi:10.1097/01.anes.0000371662.09351.1e
Practice Guidelines for Perioperative Transesophageal Echocardiography (Special Article) 1084
Guidelines for the use of transesophageal echocardiography are updated.
A New Technique to Assist Epidural Needle Placement: Fiberoptic-guided Insertion Using Two Wavelengths 1128
A novel fiberoptic technique to guide epidural needle placement is described. See the accompanying Editorial View on  page 1073 
Hydrocortisone Supplementation Enhances Hemodynamic Stability in Brain-dead Patients 1204
Treatment of adrenal insufficiency in brain-dead patients is evaluated.
Postoperative Mortality in The Netherlands: A Population-based Analysis of Surgery-specific Risk in Adults 1105
A population-based study that provides a detailed overview of postoperative mortality for several surgeries is reviewed. See the accompanying Editorial View on  page 1065 
Dorsal Horn α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid Receptor Trafficking in Inflammatory Pain (Review Article) 1259
Changes in α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor trafficking in persistent pain are reviewed.
Low Reticulocyte Hemoglobin Content Is Associated with a Higher Blood Transfusion Rate in Critically Ill Patients: A Cohort Study 1211
Approximately 3,500 blood transfusions are given to intensive care unit (ICU) patients daily in the United States. Although there are no reliable predictors of transfusion requirements, ICU patients with functional iron deficiency may be at higher risk for developing anemia requiring blood transfusion. A prospective cohort study of 62 patients was conducted to assess the effects of low reticulocyte hemoglobin content (CHr <29 pg) on transfusion rates. The overall transfusion rate was 22.6%; the rate was 39.1% versus  12.8%, in low-CHr and normal-CHr patients, respectively. Patients with low CHr (37%) had a longer median ICU stay (8 vs.  5 days), were more likely to have sepsis, and were more prone to acute renal failure (39% vs.  13%) and ICU-acquired infection (30% vs.  10%) compared with patients with normal CHr. Low CHr was significantly associated with transfusion regardless of age, severity of illness, trauma, or hemoglobin level. Low CHr is common at ICU admission and was associated with higher transfusion requirements.
Implicit Memory Formation during Routine Anesthesia in Children: A Double-masked Randomized Controlled Trial 1097
Despite evidence for implicit memory, which may result in changes in behavior during anesthesia in adults, evidence in children is less clear. This randomized, double-blind controlled trial in children aged 5 to 12 yr (N = 312) used perceptual priming (via  a degraded auditory stimulus recognition task) to detect potential development of implicit memory after anesthesia. Either a sheep sound or white noise was played continuously through headphones during general anesthesia. On recovery, children were played a sheep sound degraded by a white noise mask that progressively decreased over 60 s, with the outcome being the time taken to correctly recognize the sheep sound. There was little evidence that exposure to a sheep sound during anesthesia was associated with postoperative time to recognition of a degraded sheep sound. This study presents additional support that implicit memory formation during routine anesthesia is not a clinical concern for pediatric anesthesiologists. See the accompanying Editorial View on  page 1063 
Association of Perioperative Risk Factors and Cumulative Duration of Low Bispectral Index with Intermediate-term Mortality after Cardiac Surgery in the B-Unaware Trial 1116
Mortality after cardiac surgery may be associated with patient-related and surgery-related variables such as persistent hypotension and the cumulative duration of low processed electroencephalogram-based bispectral index (BIS). This prospective, randomized study assessed the relationships among cumulative duration of low BIS (<45), intermediate-term mortality, and anesthetic dose in patients (N = 460) who underwent cardiac surgery during a 1-yr period. During a median follow-up of 3 yr, 17.8% of patients died. There was no statistically significant difference in end-tidal anesthetic gas concentrations between patients who died and those who survived. However, cumulative duration of low BIS was independently associated with intermediate-term mortality with a 29% increased risk of death for every cumulative hour spent with a BIS less than 45. These data suggest that intermediate-term mortality after cardiac surgery was not causally related to excessive anesthetic dose. See the accompanying Editorial View on  page 1070 
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