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. 2022 Mar;11(1):3–11. doi: 10.52547/wjps.11.1.3

Prevalence and Related Factors of Electrical Burns in Patients Referred to Iranian Medical Centers: A Systematic Review and Meta-Analysis

Mohammadreza Mobayen 1, Mahsa Sadeghi 1,2,*
PMCID: PMC9018033  PMID: 35592228

Abstract

BACKGROUND

Electrical burn, one of the serious public health challenges, is considered one of the most devastating due to higher mortalities. Burn injuries impose a high economic burden on patients, the health system, and society. We aimed to determine the prevalence of electrical burn injury among burn patients hospitalized in Iran.

METHODS

A systematic literature search was conducted to identify articles published from Iran in the electronic databases of Scopus, PubMed, Embase, Google Scholar, Web of Science, and SID from Jan 2000 to Dec 2020. Next, eight publications from international databases and ten articles from the Persian SID database that met our inclusion criteria were selected for data extraction and meta-analysis. The inclusion criteria were articles done among the Iranian population with burn patients.

RESULTS

In all studies, the pooled prevalence of electrical burn was estimated at 3.8% (95% CI: 3.1% – 4.5%) in burn patients. Occurrence of electrical burn-in males and females was 92.3% (95% CI: 87.9% – 95.2%) and 7.7% (95% CI: 4.8% – 12.1%) respectively. Also, the mortality rate was 3.5% (95% CI: 2.2% – 5.6%).

CONCLUSION

The epidemiological study of electrical burns helps determine the effective factors in the occurrence of this type of damage.

Key Words: Electrical injury, Burn, High voltage, Low voltage

INTRODUCTION

Burn injuries are under-appreciated trauma that is related to considerable morbidity and mortality. It not only affects physical and mental health but threat patients’ quality of life. It occurs in all ages, with the majority among children and old age1. Burns is one of the most common traumatic injuries worldwide, especially in developing countries such as Iran. Burn injuries are prevalent in low- and middle-income countries, but their prevalence decreases in high-income countries2,3.

Regarding reports by WHO, the annual worldwide incidence of burn injuries in all types was estimated at 11 million burns, of which 180,000 were fatal4. Although the majority of burn injuries are caused by hot liquids or fire, they can be raised by cold, friction, radiation, and electric or chemical sources1. The immediate care for burn injury is related to the injury site, the source of burn (thermal, electric, or chemical), and the availability of care resources.

As one of the most critical concerns of the public health care system in industrialized countries, an electric burn injury can lead to severe complications and socioeconomic problems. It may result in severe and extensive burns and is accountable for high mortality and morbidity worldwide5,6. The mortality rate varies depending on the socioeconomic level, including 3%-15% in developed countries versus 21%-27% in developing countries7. According to recent reports, its’ mortality rate was 20%8. Previous studies have shown variation in the prevalence and epidemiology of electrical burns. Annually, electric burn injuries are estimated to be more than 3,000 admissions to burn centers in the USA, accounting for 3%-4% of all burn injuries9-12. Elsewhere, in a burn center in Pakistan, 85 children were admitted with electric burn injuries, 71.76% due to high voltage12. Based on reports of a registry-based study in Iran, electrical burn injuries occurred in 5.6% of burns13. Most electrical burns occurred in ages 21 to 50 yr and affected men more than women (89.4% vs 10.6%). Work-related accidents (46%) and electrical accidents indoors (19.4%) are the most common causes of electrical injuries. Electric burns are still a leading cause of amputation, leading to physical disability and mental health problems. There were significant amputations (25.8% vs 5.03%) and more complications (87.10% vs 67.9%) in cases whit high-voltage burns. The coma was the main complication with the highest incidence, followed by heart damage, liver injury, acute renal failure, lung injury, and shock14.

In a review of the literature, there was no more information on electric burn injuries in Iran. Understanding the epidemiology of burns can help develop preventative measures and treatment of electrical burns injuries, which depends on geographical and socio-economic differences. Because of the necessity of updating the previous knowledge, this study was conducted to assess the epidemiology and rate of electrical burn injuries in Iran.

METHODS

Study design and search strategies

We performed a systematic review according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. This was done by searching multiple electronic bibliographic databases, including Scopus, PubMed, Google Scholar, Embase, Web of Science, and SID, from database beginning Jan 2000 to Dec 2020 to find relevant studies. The search for keywords was done in the title or abstract or keywords fields or within the full text of the articles. For this purpose, we used a combination of predefined keywords, including “Burns, Electric,” “Electrical injury,” “electrical burn,” “Electrical burn injury,” “electrical injury complication,” “electrical injury squeal,” “high voltage,” “low voltage” and words like lightning, children, adults, morbidity, mortality, and amputation.

Selection criteria and quality assessment

Two reviewers separately screened the search results in the databases with relevant keywords to apply eligibility for inclusion. They analyzed the titles, abstracts, and full texts, and any disagreement between reviewers was resolved through discussion. There was no limitation regarding the language of publication, but the abstract had to be available in English or Persian. The study was limited to cross-sectional articles indexed in the Scopus or PubMed or Google Scholar or Embase or Web of Science or SID. Articles with the following criteria were then included in the study: 1) Studies relating to outcomes of electrical injury among burn patients. And 2) databases from Jan 2000 to Dec 2020. Review articles, case reports, and congress abstracts with no necessary information were further excluded. Moreover, studies of lightning electrical damages alone were excluded. The reference lists of related studies were also reviewed for any other related publications.

Quality assessment and data extraction

Two researchers independently assessed the quality using the nine-point critical appraisal checklist by Joanna Briggs Institute (JBI) for studies reporting the prevalence data, and discrepancies were resolved through consensus15. The studies included more than half of the quality evaluation parameters. Afterward, the two researchers extracted the following data from eligible studies: authors’ names, time of conducting the research, published time, geographical distribution, sample size, and prevalence of electrical burn. To reach a consensus, the inconsistencies between the researchers were further discussed.

Statistical analysis

Data analysis was performed using the random-effects model to estimate the pooled prevalence and corresponding 95% confidence interval (CI). Between-study Statistical heterogeneity was assessed using the Cochran’s Q statistic and I-square (I2) test. Publication bias was graphically evaluated by a funnel plot and mathematically evaluated using Begg’s rank correlation and Egger’s weighted regression test (P<0.05 was considered indicative of statistically significant publication bias). A meta-regression using the random-effect model (method of moments) was done to determine whether or not the prevalence of electrical injury was modulated by time (performed years). Meta-regression coefficients (slopes of the meta-regression line) indicate the estimated log events rate per unit increase in the covariate. Analysis of data and construction of graphs were done by Comprehensive Meta-Analysis Software Version 2.2 (Biostat, USA).

RESULTS

Our systematic and comprehensive search identified eighteen studies that surveyed the prevalence of electrical burn among hospitalized patients16-33. Figure 1 presents a flowchart of the literature search and study selection. The included articles had been conducted in thirteen provinces of Iran. Table 1 shows summarize of the detailed characteristics of each article recorded in the meta-analysis. All of the included articles reported the prevalence of electrical burn among burn injury inpatients (Figure 2), of which the pooled prevalence of electrical burn was estimated at 3.8% (95% CI: 3.1%-4.5%), and there was heterogeneity among electrical burn in the included study (χ2 =170.572; P<0.001; I2=90%). According to subgroup analysis by gender, the overall occurrence of electrical burn-in males and females was 92.3% (95% CI: 87.9%-95.2%) and 7.7% (95% CI: 4.8%-12.1%), respectively, reported in twelve studies (Figures 3,4). Moreover, the reported occurrence of electrical burn mortality in four studies was 3.5% (95% CI: 2.2%-5.6%) (Figure 5). Four studies20, 21, 23, 28 reported hospitalization during electrical burn patients from 4.7 to 15.2 days. Based on three studies20, 21, 23, 67.2%, 54%, and 75.7% of electrical burns occurred due to high-voltage electricity, respectively. The extent of burn area was reported in three studies ranged from 10% to 27.5% TBSA (Total Body Surface Area). The symmetric funnel plot did not show any evidence of strong publication bias (Figure 6) and was confirmed by the results of Begg’s rank correlation and Egger’s regression. Meta-regression results revealed that the occurrence of electrical injury among burns insignificantly decreased annually, with a coefficient of -0.02 % (95% CI: -0.03%– -0.01%, P<0.001) (Figure 7).

Fig. 1.

Fig. 1

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Flow chart of the literature search strategy and study selection

Table 1.

Characteristics of studies included in the meta-analysis

First autor/ Publication year Performed time Mean age Sample size Electrical burn M/F low/high
Voltage 		Hospitalized time Mortality Quality check (%) Ref.
Hadian/2004 2002 5.8 599 8 - - - - 60
Tabiee/2004 1998-2002 23.1 342 3 3/0 - - - 70
Roozbahani/2005 2003 23.3 1124 41 39/2 - - - 70
Khorasani/2007 2006-2007 - 113 13 12/1 - - 0 80
Maghsoudi,2007 1999-2004 27.5 5053 202 198/4 85/109 13.9 4 90
Mohamadi,2007 2002-2004 30.5 1352 64 61/3 21/43 11.5 3 90
Aghakhani/2008 2005 23.6 639 27 19/8 - - - 70
Rezaee/2009 2002-2006 26 5875 132 128/4 31/100 15.2 6 90
Hasani,2009 2007-2008 - 212 15 - - - - 60
Emiralavi/2010 2008 3.76 413 14 - - - - 60
Emiralavi,2012 2007-2010 31.5 2274 90 83/7 - - 3 80
Hakimi/2012 2012 2.5 175 1 - - - - 60
Ansari,2013 2008-2010 - 713 24 24/0 - 4.7 1 90
Ghorbani/2015 2010-2012 627 44 - - - - 60
Abdolkarimi/2018 2007-2013 71.5 374 12 - - - - 60
Keshavarz,2019 2008-2017 6.5 1893 78 71/7 - - - 70
Rezaee,2019 2017 29.3 35933 939 808/131 - - - 70
Ahmadi,2020 2014-2016 - 1983 86 77/9 - - - 70
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Fig. 2.

Fig. 2

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Forest plots of the overall prevalence of electrical injury among burns in Iran

Fig. 3.

Fig. 3

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Forest plots of the overall prevalence of electrical burn injury in males

Fig. 4.

Fig. 4

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Forest plots of the overall prevalence of electrical burn injury in females

Fig. 5.

Fig. 5

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Forest plots of mortality rate in electrical burns patients

Fig. 6.

Fig. 6

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Funnel plot of the prevalence of electrical injury among burns in Iran

Fig. 7.

Fig. 7

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Meta-regression of electrical burn injury rate among burn patiens

DISCUSSION

Based on WHO report, 195,000 deaths occur due to burns yearly, most (95%) of them in developing countries34. Although electrical burn is a less prevalent type of burn injury nowadays, however, that is one of the most destructive kinds of trauma owing to high morbidity and mortality with a higher occurrence in developing areas35. Various studies worldwide are different in reported frequency and epidemiology for electrical burns, but they usually contain nearly 21%–27% of all admissions to burn centers in developing countries versus 0.04% to 5% in developed ones8, 14.

In our study, the frequency of electrical burn (3.8%) was lower in comparison to some other reports from Turkey (16%), Kosovo (17%), China (18%), and a five-year survey in Iran (10.8%) but it was close to other study done in the USA (4%)35. Consistent with our study, men are more prone to electrical damages than women. For example, in the studies, 97.8%, 82%, 89%, 95%, and 92.5% of patients with electrical burn injuries were males, respectively35, 36. Regarding the prevalence of electrical injury in men and the workplace, this may be because men are often higher exposed to electrical appliances and engage in high-risk jobs35, 37. The mean age of electrical injuries patients in various studies is different. In some studies, the mean age of electrical injuries patients was reported as 30.2 or 25 years38-40. The mean age in a 5-year study in Turkey was 18.8 yr in women and 27.4 yr in men36. Moreover, most of the patients were with a mean age of 3037. Our studies reported an average age of 2.5 to 71.5 yr, depending on the study population.

Electrical burn injuries are classed as high-voltage (≥1000V) and low-voltage (<1000V). High-voltage burns due to the exert of high energy cause severe damage to the tissues 41, 42. In Pakistan and Turkey, most of the patients with electrical burn were injured by high-voltage electrical current, 71.76% and 54.5%, respectively14, 38. While most of the patients were injured by low voltage43. In our survey, three studies20, 21, 23 were reported 67.2%, 54%, and 75.7% of electric burns caused by high voltage electricity, respectively. Electrical burns are characterized by varied mortality ratios ranging from 2.35% to 26.7%14. In the present study, the mortality rate was 3.5%, which is similar to several studies. In other studies, a mortality rate of 2.8%-6% was reported44, 45. In addition, in a 20-year survey in the USA, the mortality rate in burns due to high voltage was 5.3% and by low voltage was 2.8%. Moreover, the hospital stay in the electrical burn was shorter with 18.9 d versus 26.2 d in other types of burn46. In our review, the hospitalization duration of electrical burn patients was reported from 4.7 to 15.2 days. Furthermore, in our study, the TBSA was ranged from 10% to 27.5%. In the Kurt study, the mean TBSA was 21.8% of high-voltage burns and 11.9% of low-voltage burns36. Based on a study, patients with high-voltage burns usually had more broad TBSA burns and longer hospitalization than those with low-voltage burns14. Longer hospitalization in electrical burn patients could be related to simultaneous and various limbs injuries in high-voltage electrical shock, such as falling47.

CONCLUSION

Electrical burns are a main public health problem, and their prevention should be emphasized in male and high-voltage injuries. Preventive strategies are essential to decrease the incidence of this type of burn. Protection training should be compulsive at work, such as the ability to disconnect from electrical sources immediately. Information about electrical devices, employment of expert and skilled persons, using labor standards and security systems, use of warning signs, and Public education programs in Iran can be helpful to reduce the incidence of electrical injuries. Future multicenter and long-term follow-up studies are needed to provide a comprehensive and correct knowledge of electrical burns in Iran. In the present study, we analyzed published studies that investigate the rate of electrical burn-in Iran. This study is the first Meta-analysis on electrical injury rate among burn patients during 20-year in Iran.

CONFLICT OF INTEREST

The authors declare no conflicts of interest in this work.

ACKNOWLEDGMENTS

None declared.

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