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Epidemiology of electrical and lightning related deaths and injuries among Canadian children and youth
  1. B H Nguyen1,
  2. M MacKay2,
  3. B Bailey1,
  4. T P Klassen3
  1. 1Division of Emergency Medicine, Department of Pediatrics, Hôpital Ste-Justine, Université de Montréal, Montréal, Quebec
  2. 2Plan-it Safe, The Child and Youth Injury Prevention Centre, Children’s Hospital of Eastern Ontario, Ottawa, Ontario
  3. 3Department of Pediatrics, Stollery Children’s Hospital, University of Alberta, Edmonton, Alberta
  1. Correspondence to:
 Dr B H Nguyen
 Hôpital Ste-Justine, 3175 Chemin Côte-Ste-Catherine, Montréal, PQ, Canada H3T 1C5; bich_h_nguyen{at}yahoo.com

Abstract

Among burn injuries, electrical injuries constitute a small but devastating fraction. To describe the epidemiology of electrical injuries in Canadian children, data on deaths and emergency department visits related to electrical injuries, including lightning strikes, were obtained from provincial coroners’ offices and the Canadian Hospitals Injury Reporting and Prevention Program (CHIRPP) respectively, for the years 1991–96. Twenty one deaths and 606 emergency visits highlight that electrical related deaths, more frequent among school age children, are more likely the result of high voltage and lightning strike, while emergency department visits, more frequent among younger children, are more likely the result of low voltage. While the introduction of legislated standards for child safe outlets and educational programs for parents, children, and youth are recommended strategies toward reducing the frequency of these incidents, these strategies require further evaluation before their effectiveness can be estimated.

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Beyond the first few months of life, injuries become the most frequent cause of death and long term disability in children.1 Serious burns are one of the most life altering types of injury, often requiring years of painful rehabilitation. Among burn injuries, electrical injuries (including lightning strikes) constitute a small but devastating fraction. Mortality and morbidity resulting from electrical injury have not been previously reported for the paediatric population in Canada. The purpose of this study was to describe the epidemiology of electrical injuries in the Canadian paediatric population from 1991–96 using the two routinely collected data sets with the greatest amount of detail surrounding injury circumstance.

METHODS

Data on all fatalities from 1991–96 in children aged 0–19 years resulting from electrocution, including lightning strikes, were requested from the 10 provincial and two territorial coroners’ offices across Canada. Data include age, sex, year of injury, source of electrical current, type of injury, and injury circumstances. An annual paediatric mortality rate for electrocution, including lightning strike, was calculated using age specific population data for the same period. Data on all emergency department visits for children 0–19 years related to electrical injury, including lightning strikes and for the years 1991–96 were requested from Health Canada’s Canadian Hospitals Injury Reporting and Prevention Program (CHIRPP).2 While not population based, these data characterise injury related emergency department visits to 10 paediatric and five general hospitals in Canada. They provide a rich source of circumstantial information and have been shown to be reasonably representative,3–5 and are estimated to describe approximately 16% of injuries to Canadian children (personal communication, Margaret Herbert, Injury Section, Health Surveillance Canada, September 2002). Data include age, sex, year of injury, setting, injury circumstance, and disposition.

RESULTS

During the time period examined there were 21 deaths due to electrocution among children in Canada. Five of these (24%) were the result of lightning strike. This number may underestimate the true number of electrical injury deaths, as data were available from all coroners’ offices except Nova Scotia where the information system is not currently automated. In addition, the data released for Ontario for 1995–96 were considered preliminary. Table 1 describes the deaths by source of electrical current and age of victim. The median age for high voltage electrical deaths was 13.2 years and for lightning strike 14.2 years. All but one of the fatalities was male and all but two occurred outdoors. Younger children (5–9 years) were more likely to be electrocuted while playing around electrical company installations (for example, trespassing around electrical substations), while older victims were more likely to be electrocuted or struck by lightning while working near or around their house (for example, pruning trees, fixing TV antennae). One high voltage incident in Quebec in 1991 killed three adolescents simultaneously when the TV antennae they were erecting under adult supervision touched a 25 000 volts electrical line. An annual rate of electrical death (including lightning) for Canadian children 0–19 years was calculated at 0.045/100 000.

Table 1

Coroners’ reported electrocution deaths by source of current and age, Canada, 1991–96

A total of 606 electrical injuries, including nine cases of lightning strike, were reported to CHIRPP from 1991–96. None of these injuries resulted in a fatality and there was no overlap with the coroners’ data during this period. Thirteen percent of CHIRPP cases required admission to hospital, 25% were held for observation, and 42% required treatment and some degree of follow up. Sixty percent of those injured and 70% of those hospitalised were male. Table 2 describes injuries by circumstances and age of victim. While 68% of the electrical injuries occurred in 0–4 year olds; this age group made up only 42% of hospitalised CHIRPP cases. Ten to 14 year olds, who made up 13% of injuries, represented 34% of hospitalised CHIRPP cases. Seventy seven percent of the injuries occurred in the victim’s own home or yard and the most common circumstance was a child placing an object or finger in an electrical outlet or device (42%).

Table 2

CHIRPP reported electrical injuries by circumstance and age, 1991–96

DISCUSSION

The current study is limited in that the picture of paediatric electrical injury for Canada presented is incomplete. The mortality data available were incomplete and hospitalisation data were not presented due to the cost of obtaining them. While the CHIRPP data provide useful detail not available from other sources, it is likely that they under-represent that actual number of emergency department visits related to electrical injury. This may be particularly true for older adolescents who are more likely to be seen at adult emergency rooms. Despite being incomplete, however, the available picture does provide evidence that electrical injury including lightning strike is a real and preventable issue in the Canadian paediatric population.

That the annual death rate of 0.045/100 000 children 0–19 years for Canada was much lower than the rate in the United States of 0.73/100 000 for the same time period is notable.6 The exact reason for this discrepancy is unclear, but may be in part the result of an underestimate in Canadian deaths due to the incomplete data and differential exposure related to climactic differences. In this analysis electrical injury death appears to be a greater issue for school age children (5–19 years) than younger children. This is likely the result of increased exposure to lightning and high voltage (≥1000 volts) lines either because of activities being undertaken in the outdoor setting (for example, yard chores, sports, and recreational activities) or increased risk taking behaviour (for example, trespassing in high voltage installations). The Lightning Safety Group, a consensus panel in the United States, have developed guidelines that constitute a summary of safest practices based on the research and experience available in1998.7 Current best practice to prevent lightning injuries focuses on educational strategies. For high voltage efforts focus on regulation of power line installation,8 installation of underground electrical lines,9 and educational efforts—which may be best targeted at adolescents who appear to be at greater risk due to increased exposure.

While the greatest number of deaths occurred in older children, the majority of less severe injuries occurred in children 0–4 years. In our study, non-fatal electrical injuries in children appear to be typically the result of low voltage current originating from household electrical outlets. Fortunately, similar to previous studies, most of these injuries are minor requiring little or no treatment.10 However, the children in this age group did make up 42% of hospitalised CHIRPP cases. Unlike the United States where cord biting appears to be a greater issue,8,11 contact with low voltage electrical outlets, whether direct (for example, mouth or finger) or indirect (for example, fork or other implement), was the most frequent cause of injury in the current study. The reason for this discrepancy is unclear and it may be that multinational studies examining differences in circumstances and prevention strategies may guide best practice. Proposed strategies to address the prevalent hazard include legislated standards for the manufacture and use of child safe electrical outlets and the addition of electrical injury prevention to educational programs for parents and children. Research suggests that to be effectively ‘‘child safe’’ electrical outlets should be engineered to meet four criteria. They should be permanent fixtures on the wall; have an automatic shield closure to limit access (a more passive measure than requiring the use of socket plugs); consist of parts of a sufficient size not pose a choking risk; and include labels addressing age appropriateness.12,13

There are several ‘‘child safe’’ outlet designs on the market, however their direct effectiveness has not been rigorously evaluated and without evidence of effective design it is too early to assess the effectiveness of an enforced standard requiring their installation. Educational programs addressing age specific hazards exist, but not all include hazards associated with electrical injury.14 Whether this is an oversight or the result of a prioritisation of hazards concomitant with injury risk, as with other areas of injury prevention it is likely that a multipronged approach including education to support environmental changes will prove most effective. Yet even if legislation of environmental changes with associated educational programs is the way to proceed, careful evaluation and enforcement of any legislation are necessary. Finally, although primary prevention is the ultimate goal, the education and training of health care professionals and first responders with respect to how to triage and treat victims of lightning strike and other electrical injuries is also important to limit the impact of electrical injuries.15

REFERENCES

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