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CMAJ October 27, 2009 181 (9) 561;
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Urgent air transport of patients

Critical events occur in 1 out of 20 patients during urgent air–medical transport. In a population-based cohort study involving nearly 20 000 patients, Singh and colleagues found that procedures for airway management and new hypotension accounted for most of the critical events. Female sex, assisted ventilation or hemodynamic instability before transport, and increased duration of transport were independent predictors of critical events. See Research, page 579

Criteria to decide which patients require urgent air transport are widely available, but the data on which these criteria are based are limited, says Isakov. Large cohort studies such as the one described by Singh and colleagues will remain the main source of evidence to inform us of this service. See Commentary, page 569

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Image courtesy of © 2009 Jupiterimages Corp.

Crack cocaine and HIV infection

Rates of HIV transmission could be reduced among injection drug users if their smoking of crack cocaine is considered as an independent risk factor, say DeBeck and colleagues. In their study involving 1048 injection drug users in Vancouver, 137 acquired HIV infection during the follow-up phases. The risk of HIV seroconversion among participants who were daily smokers of crack cocaine increased over time. See Research, page 585

Implementation of harm-reduction programs should address the unique needs of people who smoke crack cocaine as part of a comprehensive HIV prevention strategy, say Celentano and Sherman. The distribution of “crack kits” to this population may have the potential to reduce HIV transmission, they add. See Commentary, page 571

Air pollution and appendicitis

Some cases of appendicitis may be triggered by short-term exposure to air pollution, suggest Kaplan and colleagues. In their 7-year study, they estimated the odds of appendicitis relative to short-term increases in concentrations of selected pollutants among 5191 adults admitted to hospital with appendicitis. Their findings need to be replicated in other populations, they caution. See Research, page 591

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Series on asthma

The avoidance of some risk factors, such as smoking during pregnancy and exposure to occupational sensitizers, can be strongly encouraged in the management of asthma. In the first of a 7-part series, Subbarao and colleagues discuss the rising prevalence of asthma and risk factors associated with the condition. See Review, page E181

Don’t pass the salt, please

The reduction of sodium in our diets could mean a reduction in serious health problems and mortality rates, say Mohan and colleagues. Government, industry and health professionals all have important roles to play in the reduction of dietary sodium. See Analysis, page 605

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Cerebellar syndrome and metronidazole

Sarna and colleagues describe 2 patients who developed a cerebellar syndrome after being given metronidazole. Their conditions improved after the medication was stopped. See Practice, page 611

Yellow nail syndrome

A 58-year-old woman had yellow fingernails and toenails, intermittent cough and edema. See Clinical images, page 614

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Canadian Medical Association Journal: 181 (9)
CMAJ
Vol. 181, Issue 9
27 Oct 2009
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