|Year : 2019 | Volume
| Issue : 5 | Page : 302-315
A systematic review and meta-analysis of the prevalence and complications of paraphenylenediamine-containing hair dye poisoning in developing countries
Akshaya Srikanth Bhagavathula1, Deepak Kumar Bandari2, Moien Khan3, Abdulla Shehab1
1 Department of Internal Medicine, College of Medicine and Health Sciences, UAE University, Al Ain, UAE
2 Department of Pharmacy Practice, Vaagdevi Institute of Pharmaceutical Sciences, Warangal, Telangana, India
3 Department of Family Medicine, College of Medicine and Health Sciences, UAE University, Al Ain, UAE
|Date of Submission||05-Oct-2017|
|Date of Decision||06-Mar-2019|
|Date of Acceptance||29-Apr-2019|
|Date of Web Publication||26-Nov-2019|
Dr. Deepak Kumar Bandari
Department of Pharmacy Practice, Vaagdevi Institute of Pharmaceutical Sciences, Warangal, Telangana
Source of Support: None, Conflict of Interest: None
BACKGROUND: Suicide is a public health problem, and the number of paraphenylenediamine (PPD)-containing hair dye poisoning with suicidal intentions is increasing in developing countries. In order to better understand this situation, we aimed to conduct a systematic review and meta-analysis to estimate the prevalence and complications associated with hair dye poisoning in developing countries.
METHODS: We conducted a systematic review of epidemiological studies using MeSh terms and text keywords to identify studies from the inception to March 2016 about hair dye poisoning with suicidal intentions in developing countries. A meta-analysis was used to calculate the pooled prevalence proportion of hair dye poisoning and its major complications. Data extraction, data analysis, and risk of bias assessment were performed.
RESULTS: Thirty-two studies were included in the systematic review and 29 of these studies containing 5,559 subjects covering six countries were included in the meta-analysis. The pooled prevalence proportion of hair dye poisoning with suicidal intentions was 93.5% (95% confidence interval [CI] = 91.6–95.4) with a mortality rate of 14.5% (95% CI = 11.1–17.9). Of these, 73.8% were female, and 26.2% were male (sex ratio: 2.7:1). The occurrence of angioneurotic edema in hair poisoning patients was 67.1% (95% CI = 56.6–77.6), and tracheostomy intervention was considered in 47.9% (95% CI = 22.7–73.2) patients with respiratory distress. Acute renal failure was noticed in 54.7% (95% CI = 34.5–74.9) of the pooled samples and mortality rates were 14.5% (95% CI = 11.1–17.9). The pooled rate of the population studied from Asia and Africa showed 94.6% (95% CI = 92.5–96.7) and 82.9% (95% CI = 70.6–95.3), respectively, ingested hair dye with suicidal intentions. Further, studies carried out in Africa showed slightly higher mortality of 15.1% (95% CI = 6.56–23.7) than the Asians 14.3% (95% CI = 10.5–18.1).
CONCLUSION: This meta-analysis provided clear evidence of the prevalence of hair dye poisoning among individuals with suicidal intentions and had given robust evidence for policy making to curtail emerging PPD-containing hair dye poisoning in developing countries.
Keywords: Developing countries, hair dye poisoning, hair dye toxicity, household poisoning, paraphenylenediamine poisoning, suicides
|How to cite this article:|
Bhagavathula AS, Bandari DK, Khan M, Shehab A. A systematic review and meta-analysis of the prevalence and complications of paraphenylenediamine-containing hair dye poisoning in developing countries. Indian J Pharmacol 2019;51:302-15
|How to cite this URL:|
Bhagavathula AS, Bandari DK, Khan M, Shehab A. A systematic review and meta-analysis of the prevalence and complications of paraphenylenediamine-containing hair dye poisoning in developing countries. Indian J Pharmacol [serial online] 2019 [cited 2021 Jul 31];51:302-15. Available from: https://www.ijp-online.com/text.asp?2019/51/5/302/271635
| » Introduction|| |
Self-harm is largely preventable. Risk behavior to attempt suicides and self-inflicted injuries has been increasing worldwide. It is estimated that suicides likely contribute to >2% of the global burden disease by the year 2020. In particular, there was growing morbidity (suicide attempts) and mortality (suicide deaths) in several developing countries and placing a large part of the global suicide burden. The knowledge and awareness of the harmful effects of some commonly used household products such as organophosphate pesticides, oleander seeds, and hair dyes have turned them into hazardous suicidal agents in developing countries.
The use of henna-containing hair dyes for darkening gray hair started since 4000 years. With an increasing intrinsic human desire to improve their appearance, millions of consumers use hair dyes every day. Paraphenylenediamine (PPD) is an essential ingredient in hair dyes as oxidizing agent coupling with modifiers (resorcinol, m-phenylenediamine, m-aminophenols, and others) results in the colored reaction product. In developed countries, standard hair dye formulations contain a maximum of 2% PPD in 100 ml dye solution, which makes it less toxic if accidental poisoning occurs. Due to lack of standard regulations in developing countries, these concentrations range from 2% to 90%. Several epidemiological and toxicological studies have indicated the safety of hair dye through the topical route., Although these are topically applied substances, several cases of severe human poisoning with suicidal intentions have been widely reported in developing countries, recently observed particularly in India, Sudan, Pakistan, Morocco, Egypt, and Tunisia.,,,, The primary hair dye ingredients such as PPD and resorcinol can cause severe multiorgan toxicities on oral ingestion. For instance, PPD can cause severe angioneurotic edema leading to acute respiratory distress at an early phase and rhabdomyolysis, acute tubular necrosis resulting in acute renal failure (ARF) leading to poor prognosis, and death. Some of the other complications such as muscle tenderness, seizures, severe metabolic acidosis, hypotension, hypoglycemia, myocarditis, electrocardiographic changes, cardiac rhabdomyolysis, shock, discoloration of urine, and hepatitis were also reported. Given this situation, several studies have reported a large number of hair dye poisoning cases in the above-specified countries. Since no antidote is present to counter the hair dye poisoning, early effective clinical interventions to improve the patient outcomes are vital. However, until date, no systematic review had been conducted in this area. A better understanding of these issues could help public health officials to develop risk-minimizing strategies to counter the misuse of PPD-containing hair dyes among the general population in developing countries.
Therefore, in this study, we conducted a systematic review and meta-analysis of the current literature related to hair dye poisoning among adult individuals with suicidal intentions attending health facilities reported by various studies from developing countries. Furthermore, the study also examined the major clinical complications and mortality associated with PPD-containing hair dye poisoning.
| » Materials and Methods|| |
We used established methods recommended by the Cochrane guidelines to conduct the meta-analysis following Preferred Reporting Items for Systematic review and Meta-Analysis statement [Appendix 1].
Data source and search strategies
We searched for published studies related to hair dye poisoning in the following electronic databases (PubMed, Scopus, Google Scholar, and Embase) from their inception to March 2016. The search phrase was carried using the MeSH terms and text keywords: (poisoning*) OR (hair dye poisoning*) OR (self-harm) OR (PPD poisoning*) OR (PPD*) OR (suicides*). Citations were screened at the title and abstract level and retrieved as a full report if they were considered relevant.
We included studies if they met the following inclusion criteria:
- Adult patients aged 18 years or above who had attended health facilities because of PPD-containing hair dye poisoning with suicidal intentions
- Studies conducted in developing countries
- The study must be an original article or reporting >10 cases (for meta-analysis)
- All the papers written in the English language were considered.
We excluded the following studies: (1) nonpatient related studies (analytical, immunological, topical application, autopsy, and knowledge, attitude, and practice studies) and (2) studies conducted on children.
The review was limited to studies that reported the following:
- Hair dye poisoning patients with suicidal intentions
- Early-phase complications – angioneurotic edema or cervicofacial edema due to hair dye ingestion
- Life-saving tracheostomy intervention in hair dye poisoning patients with respiratory distress
- Late-phase complications – ARF in hair dye intoxication patients
- Death due to hair dye poisoning.
All the records that were identified through systematic searches of the electronic databases were screened and independently abstracted data using prespecified forms. After the records were extracted, duplicate records were removed, and they were screened for the titles and abstracts to identify potentially eligible studies. Articles that were potentially eligible for inclusion were independently assessed for the review. Then, the investigators independently appraised the accuracy of the abstract and resolved any discrepancies by consensus.
Investigators independently extracted data about the number of hair dye poisoning individuals with suicidal intentions and clinical data that were previously mentioned.
Stata V.12.0 software (StataCorp, College Station, Texas, USA) was used for all the statistical analysis. Heterogeneity was assessed by Cochran's Chi-square and quantified with the I2 statistic, which was considered to be low when it was 0.24%. Considering heterogeneity across studies, a random effects model was used to calculate pooled data and 95% confidence intervals (95% CI). DerSimonian and Laird method was used to calculate the pooled estimates of the random effects model. We performed subgroup analysis by gender type (male or female) to deal with heterogeneity. We combined the results of subgroups into a single group according to the formulae recommended by the Cochrane Collaboration. In order to address the issue of heterogeneity among studies, a sensitivity analysis was performed between the studies carried out in different continents. Publication bias includes selection bias, performance bias, attrition bias, reporting bias, and another risk of bias which was assessed using the Begg's test and Egger's regression test. These tests were used to assay the possibility of publication bias, and significance was set at a P < 0.05.,
| » Results|| |
Literature search and selection
The search strategy identified 1430 records for potential inclusion of study [Figure 1]: PubMed (n = 85), Science Direct (n = 854), Embase (n = 36), and Google Scholar (n = 1330). After reviewing the abstracts, 42 full-text articles were assessed for further assessment of their eligibility [Appendix 2]. Finally, 32 studies were determined to be eligible for the systematic review,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, and 29 were included in the meta-analysis.,,,,,,,,,,,,,,,,,,,,,,,,,,,, All the included studies contained 5,559 subjects covering 17 from India,,,,,,,,,,,,,,,,, Sudan,,,,,,, Pakistan,,,, Egypt,, Morocco,,,,, and Tunisia, Eighteen studies were conducted prospectively,,,,,,,,,,,,,,,,, and 14 retrospectively.,,,,,,,,,,,,, The study population was ranging from 9 to 1545. Fourteen studies were carried out for ≤1-year duration,,,,,,,,,,,,, and 16 were for >1–10 years.,,,,,,,,,,,,,,, Two studies did not specify their study durations.,
The baseline characteristics of the 32 included studies are shown in [Table 1]. Among these, 4280 used PPD-containing hair dye with suicidal intentions,,,,,,,,,,,,,,,,,,, 192 were due to accidental poisoning,,,,,,,,,,,, and 9 studies (n = 1087) did not specify the reasons for hair dye poisoning.,,,,,,,, Majority of the hair dye poisoning cases were female (n = 3904; 73.2%) when compared to male (n = 1431; 26.8%) with a sex ratio of 2.7:1 (odds ratio [OR] =0.13; 95% confidence interval [CI] = 0.12–0.15). However, in some studies, male patients were higher than females.,,,
|Table 1: Description of paraphenylenediamine-containing hair dye poisoning studies which are included in this systematic review and meta-analysis|
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Ingestion of paraphenylenediamine-containing hair dye with suicidal intentions
We identified a total of 20 studies that described the proportion of the population which ingested PPD-containing hair dye as a suicidal solution (OR = 93.5%; 95% CI = 91.65–95.42) [Figure 2]. The pooled prevalence of suicidal intentions proportion was 4.9% (95% CI = 4.54–5.33) with an overall mortality rate of 14.5% (95% CI = 11.1–17.9).
|Figure 2: Ingestion of paraphenylenediamine-containing hair dye with suicidal intentions|
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Angioneurotic edema in hair dye ingested patients
Twenty-one studies reported the individuals who developed angioneurotic edema or cervicofacial edema. Overall, angioneurotic edema was observed in 67.1% (95% CI=56.6-77.6%, P<0.001) of the patients ingested PPD-containing hair dye (2,931 of 4,342 patients), respectively [Figure 3].
|Figure 3: Cervicofacial edema–angioneurotic edema in hair dye ingested patients|
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The effectiveness of tracheostomy intervention
Sixteen studies comprising 1,901 patients were included in the analysis of tracheostomy intervention in PPD-containing hair dye poisoning [Figure 4]. The tracheostomy intervention was considered in 47.9% (680 of 1901 patients; 95% CI = 22.7–73.2; P < 0.001) with heterogeneity I2 = 99.7%.
|Figure 4: Analysis of tracheotomy intervention in paraphenylenediamine-containing hair dye poisoning|
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The occurrence of acute renal failure
Twenty studies comprising 4,161 patients provided data on ARF [Figure 5]. PPD-containing hair dye poisoning resulted significantly increased the risk of ARF found in 54.7% (n = 1374) patients (95% CI = 34.5–74.9; P < 0.001) with heterogeneity I2 = 99.8%.
|Figure 5: Occurrence of acute renal failure in hair dye poisoning patients|
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Hair dye intoxication mortality
We identified a total of 25 studies comprising 5,238 patients were included in the analysis of hair dye intoxication mortality. There was a statistically significant mortality rates noticed with hair dye intoxication; the respective intoxication mortality rates were 14.5% (636 of 5,238 patients); 95% CI = 11.1–17.8; P < 0.001; heterogeneity I2 = 93.8%, [Figure 6].
To investigate the potential discrepancy, we divided subgroups by gender using a random model. The results of 25 studies were stratified by their gender (male versus female) about hair dye poisoning with suicidal intentions. Overall, the percentage of hair dye poisoning with suicidal intentions was 3.46 times (95% CI = 28–41.1%) higher in females than males [Figure 7]. Indeed, in the subgroup analysis, the percentage of ingested hair dye females with suicidal intentions was 73.8% (95% CI = 67.7–77.4), more than double to that of males 26.2% (95% CI = 22.6–32.3), with heterogeneity I2 = 93.4%.
Sensitivity analysis stratified for different continents
Sensitivity analysis was carried out where the studies were conducted from different continents concerning “suicidal intentions” and “mortality” in hair dye poisoning samples. Studies carried out in Asia and Africa highlighted 94.6% (95% CI = 92.5–96.7) and 82.9% (95% CI = 70.6–95.3) of the samples, respectively, who ingested hair dye with suicidal intentions. Further, studies carried out in Africa (seven studies) showed higher mortality of 15.1% (95% CI = 6.56–23.7) than the Asians (18 studies) 14.3% (95% CI = 10.5–18.1).
Nine studies do not report the type of poisoning (suicidal or accidental) and early-stage symptoms (cervicofacial edema or angioneurotic edema), and eleven studies do not report the type of interventions used for clinical management and also do not report the late-phase complications (ARF). Three studies included another type of poisoning patients. Begg's test and Egger's test showed the existence of publication bias (P = 0.026) [Appendix 3].
| » Discussion|| |
In recent years, there are an increasing number of epidemiological studies about hair dye poisoning (PPD) in developing countries. It is now possible to obtain direct evidence of hair dye poisoning situation in adults with suicidal intentions. Through a systematic review, we gathered different studies published from the inception to January 2016 to estimate the prevalence, complications, interventions, and mortality associated with hair dye poisoning in developing countries. Previous reviews focused on clinical manifestations and treatment modalities for hair dye poisoning,in vivo toxicokinetic profile and safety of hair dyes in industrialized countries, and PPD poisoning in children.
Our investigation included 29 articles with a total of 5,559 subjects, covering different locations among six developing countries which guaranteed the reliability of this meta-analysis. The analysis conducted on eight different outcomes showed exciting results. Overall, the pooled prevalence proportion of PPD-containing hair dye poisoning was 4.9% (95% CI = 4.54–5.33) among individuals with suicidal intentions with a sex ratio of 1:2.7. However, >90% of the samples ingested hair dye with suicidal intentions. Several studies have reported the reasons for using hair dye agents for deliberate self-poisoning due to their low prices, high availability, and easy availability to obtain without raising suspicions.,, Indeed, the PPD concentration in hair dyes also ranges from 2% to 90% that can increase the multisystem toxicity on oral ingestion.,, These findings pointed out the lack of regulations of cosmetic ingredients and misuse of hair dyes among the general public in developing countries.
The present study found that the pooled proportion of early-stage clinical manifestations such as oropharyngeal edema, cervicofacial edema, and angioneurotic edema was noticed in 67.1% of the hair dye poisoning patients. Our findings were considerably less than those of previous studies. In Jain et al. study, the proportion of severe face and neck edema was 73% and it was 79% in Kallel et al. study, and in Suliman et al. study, all the patients studied had developed angioneurotic edema. Several studies cited the reason for the occurrence of angioneurotic edema and its association with PPD in the hair dyes.,,, PPD is a standard chemical allergen and has corrosive properties. Performing gastric lavage to detoxification may increase the risk of airway obstruction leading to cause severe angioneurotic edema and respiratory distress. However, early administration of nasogastric tube or endotracheal tube compared to gastric lavage needed further investigation.
The current study also revealed the effect of emergency tracheostomy in hair dye ingested patients with severe respiratory distress. Nearly half (48%) of the pooled samples studied underwent emergency tracheostomy surgical procedure as a supportive intervention. In a Pakistan study, a significant number of deaths in the tracheostomy group (10/29) was comparably lower than those without tracheostomy (5/9). This indicated emergency tracheostomy deemed to have a significant role in improving the hair dye ingested patient outcomes. However, none of the studies has tried cricothyroidotomy procedures or other surgical interventional procedures, which need to be explored further.
Late-stage complications such as ARF (oliguria, anuria, rhabdomyolysis, and renal tubular necrosis) in PPD-containing hair dye poisoning patients were characterized by chocolate brown-colored urine and were associated with tubular obstruction by myoglobin casts causing renal failure. The proportion of ARF was 55% in the pooled samples, and this proportion is consistent with Jain et al. study conducted on 1595 hair dye poisoning (PPD) patients but lower than Naqvi et al. study conducted on acute kidney injury (AKI) patients caused by PPD toxins attending tertiary renal care center in Pakistan for a period of 25 years. However, these results, which may play a role in effective management of ARF, needed hemodialysis to improve the survival and close monitoring of methemoglobin and myoglobin concentrations in urine which can serve as potential biomarkers of ARF in hair dye poisoning patients.
Whereas mortality was frequently reported across studies, fewer studies reported data within the first 5 h of admission and soon after gastric lavage. Filali et al. retrospectively studied a large number of PPD systemic poisoning patients for over ten years and demonstrated a mortality rate of 21%. Further, data were obtained from a cross-sectional study in which the mortality rate (27%) provided a more definitive answer regarding the effect of systemic toxicity of PPD on hair dye poisoning patients. No single study evaluating the effect of interventions has yet been powered to reduce mortality and adverse events, but our meta-analysis of 5,238 patients with suicidal intentions found in 14.4% of hair dye poisoning death. It should be noted. However, the patient population differ.
Besides, the subgroup analysis demonstrated that a large part of the female population ingested hair dye with suicidal intentions. This practice makes it challenging to address the control of using household products as a suicidal agent. This phenomenon of using hair dye as a suicidal agent is particularly alarming in developing countries such as India, Sudan, Pakistan, and Morocco. Therefore, it is essential to implement awareness about interventions to curtail the misuse of hair dyes and restrict the sale of hair dyes with high PPD concentrations. Further, the mortality associated with hair dye poisoning has not shown much difference between the continents. The study highlights the need for strict evaluation of PPD concentrations in hair dyes and revises the cosmetic regulations in developing countries. Further, responsible cosmetic industries should focus on identifying alternative for PPD use in hair dye. Because of no known antidote for hair dye poisoning, it is necessary to conduct further research on this topic to identify potential antidote and effective interventions to formulate treatment guidelines.
The present study has some limitations that should be acknowledged. First, there was high heterogeneity noticed among the studies analyzed, with a consequent lack of homogeneity of the outcomes, so we used a random effect model to tackle this problem. The heterogeneity was still high within subgroups, which might be influenced by factors such as geographical, racial, cultural, social diversity, and economic differences among the nations in which the studies were conducted. Second, the presence of publication bias such as incomplete data, reporting biases, and performance biases was noticed in the included studies used retrospective designs. This publication bias might lead to overestimate the pooled effect size of the included studies. Furthermore, there are geographic differences in outcomes that need further investigations with more intensive randomized controlled trials and cohort studies.
| » Conclusion|| |
The overall prevalence of PPD-containing hair dye poisoning with suicidal intentions in developing countries was 4.9% with a pooled percentage of 93.5%. The results indicate that hair dye poisoning with suicidal intentions has a higher proportion of clinical morbidity and mortality. The rate of using hair dye with suicidal intentions was comparatively higher in females than males (2.7:1). This meta-analysis revealed an alarming hair poisoning situation in developing countries in recent decades and provided robust evidence for policy making to curtail emerging hair dye poisoning in developing countries.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
| » Appendix|| |
| » Appendix 1|| |
PRISMA 2009 checklist
| » Appendix 2|| |
Excluded articles with reason:
- Hooff GP, van Huizen NA, Meesters RJ, Zijlstra EE, Abdelraheem M, Abdelraheem W, et al. Analytical investigations of toxic p-phenylenediamine (PPD) levels in clinical urine samples with special focus on MALDI-MS/MS. PLoS One 2011;6:e22191.
- Hamdouk M, Abdelraheem M, Taha A, Cristina D, Checherita IA, Alexandru C, et al. The association between prolonged occupational exposure to paraphenylenediamine (hair-dye) and renal impairment. Arab J Nephrol Transplant 2011;4:21-5.
- Jain PK, Agarwal N, Sharma AK, Akhtar A. A prospective study of ingestional hair dye poisoning in Northern India (Prohina). J Clin Med Res 2011;3:9-19.
- Derkaoui A, Labib S, Elbouazzaoui A, Achour S, Sbai H, Harrandou M, et al. Paraphenylenediamine poisoning in Morocco: Report of 24 cases. Pan Afr Med J 2011;8:19.
- AlGhamdi KM, Moussa NA. Knowledge and practices of, and attitudes towards, the use of hair dyes among females visiting a teaching hospital in Riyadh, Saudi Arabia. Ann Saudi Med 2011;31:613-9.
- Ababou A, Ababou K, Mosadik A, Lazreq C, Sbihi A. Myocardial rhabdomyolysis following paraphenylene diamine poisoning. Ann Fr Anesth Reanim 2000;19:105-7.
- Mathur AK, Gupta BN, Narang S, Singh S, Mathur N, Singh A, et al. Biochemical and histopathological changes following dermal exposure to paraphenylene diamine in guinea pigs. J Appl Toxicol 1990;10:383-6.
- Mustafa OM. Acute poisoning with hair dye containing paraphenylene diamine: The Gazira experience. J Arab Board Specialization 2001;3.
- Sir Hashim M, Hamza YO, Yahia B, Khogali FM, Sulieman GI. Poisoning from henna dye and para-phenylenediamine mixtures in children in Khartoum. Ann Trop Paediatr 1992;12:3-6.
- Abdelraheem MB, El-Tigani MA, Hassan EG, Ali MA, Mohamed IA, Nazik AE, et al. Acute renal failure owing to paraphenylene diamine hair dye poisoning in Sudanese children. Ann Trop Paediatr 2009;29:191-6.
Reasons for excluding in Meta-analysis
- Prasad NR, Bitla ARR, Manohar SM, Devi HN, Rao PVLN. A retrospective study on the biochemical profile of self poisoning with a popular Indian hair dye. J Clin Diagn Res 2011;5 Suppl 2:1343-6.
- Charra B, Hachimi A, Benslama A, Habti N, Farouqu B, Motaouakkil S. Immunological manifestations in paraphenylene diamine poisoning. Int J Clin Med 2011;2:435-8.
- Murugan M, Bairagi KK. Incidence of suicides by poisoning with a popular Indian brand of hair dye. J Indian Soc Toxicol 2010;6:40-1.
| » Appendix 3: Funnel plot showing risk of bias|| |
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