Fatal Anaphylaxis: Mortality Rate and Risk Factors

Paul J Turner, Elina Jerschow, Thisanayagam Umasunthar, Robert Lin, Dianne E Campbell, Robert J Boyle, Paul J Turner, Elina Jerschow, Thisanayagam Umasunthar, Robert Lin, Dianne E Campbell, Robert J Boyle

Abstract

Up to 5% of the US population has suffered anaphylaxis. Fatal outcome is rare, such that even for people with known venom or food allergy, fatal anaphylaxis constitutes less than 1% of total mortality risk. The incidence of fatal anaphylaxis has not increased in line with hospital admissions for anaphylaxis. Fatal drug anaphylaxis may be increasing, but rates of fatal anaphylaxis to venom and food are stable. Risk factors for fatal anaphylaxis vary according to cause. For fatal drug anaphylaxis, previous cardiovascular morbidity and older age are risk factors, with beta-lactam antibiotics, general anesthetic agents, and radiocontrast injections the commonest triggers. Fatal food anaphylaxis most commonly occurs during the second and third decades. Delayed epinephrine administration is a risk factor; common triggers are nuts, seafood, and in children, milk. For fatal venom anaphylaxis, risk factors include middle age, male sex, white race, cardiovascular disease, and possibly mastocytosis; insect triggers vary by region. Upright posture is a feature of fatal anaphylaxis to both food and venom. The rarity of fatal anaphylaxis and the significant quality of life impact of allergic conditions suggest that quality of life impairment should be a key consideration when making treatment decisions in patients at risk for anaphylaxis.

Keywords: Anaphylaxis; Drug allergy; Food allergy; Insect sting; Mortality.

Copyright © 2017 The Authors. Published by Elsevier Inc. All rights reserved.

Figures

Figure 1
Figure 1
Estimated rates of fatal drug, food, and venom anaphylaxis compared with other risks for the general population. Reference risks are for the US population, unless otherwise stated. Bars represent the range of estimates from recent population-based studies of fatal anaphylaxis.
Figure 2
Figure 2
Estimated rates of fatal food and venom anaphylaxis for people with known food allergy or insect venom allergy. Reference risks are for the US population, unless otherwise stated. Data shown for individuals with food allergy are the 95% confidence interval of fatal food anaphylaxis risk, derived from the systematic review of Umasunthar et al. Data shown for individuals with insect venom allergy were calculated using the range of estimates from recent population-based studies of fatal venom anaphylaxis, and an estimated 3% population prevalence of insect venom allergy.

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