Background
Substance use disorder (SUD) is a complex condition involving patterns of symptoms caused by the uncontrolled use of a substance despite its harmful consequences [
1]. Substance abuse is a serious public health problem throughout the world [
2]. The World Health Organization (WHO) reported that approximately 1 billion people smoke tobacco worldwide, despite the fact that tobacco is the main cause of morbidity and mortality [
3]. Alcohol abuse is also a serious and prevalent mental disorder; however, WHO data reveal that 76.5 million people struggle with alcohol-related disorders [
4]. Furthermore, nearly 5% of people aged 15–64 consume illicit drugs worldwide [
5]. Cannabis and Amphetamine-type stimulants (ATS) are the two most frequently abused illicit drugs, with a global annual prevalence of 2.6–5% and 0.3–1.2%, respectively [
6]. Licit drugs (prescription medications), such as sedatives, analgesics, hypnotics, and opioid substitution drugs, are largely misused to produce psychoactive effects. The United Nations International Narcotics Control Board expects that misuse of licit drugs will overcome illicit drug abuse globally [
7]. It has been shown that women and individuals from lower social classes are more prone to misuse prescription drugs [
8,
9]. In the United States (US), prescription medicines are the second most abused drugs after cannabis [
10].
In Iraq, a few epidemiological studies on SUD were conducted before 2003, which may align with the fact that Iraq had the lowest rates of substance abuse, according to WHO reports from 2002 [
11]. After 2003, there was considerable evidence of an increase in drug abuse and long-term mental health conditions like depression [
12,
13]. The substances commonly abused in Iraq are alcohol and prescription medicines, such as tramadol, benzodiazepines, codeine, and benzhexol, and there has been an increase in the abuse of hashish and ATS in some regions
. Substance abuse is predominant among young males, and licit drug abuse is the most common type, as there are few restrictions on these drugs, which can be obtained without prescription [
14].The Iraqi National Household Survey on Alcohol and Drug Use (INHSAD) revealed that lifetime tobacco use was reported by 28.8%, lifetime alcohol use by 8.1%, licit drug use by 2.9%, and illicit drug use by 0.3% [
15], while the Iraqi Mental Health Survey found lifetime alcohol abuse to reach a rate of 6.8% among men and 0.6% among women, and the lifetime prevalence of licit drug misuse was 7% [
16]. Before 2009, Iraqi authorities frequently seized cannabis, with opium accounting for 15% of all drugs in 2010; however, this rate dropped to 5% in 2011 [
14].
Hepatitis C virus (HCV) infection is increasingly recognized as a significant healthcare problem worldwide, with more than 170 million people suffering from this chronic infection [
17]. HCV is highly prevalent among injection drug users (IDUs) [
18]. IDUs acquire infection by coming into contact with blood during the act of injecting, as a result of sharing needles, syringes, and other injection equipment [
19]. In Iraq, there is a low endemicity of both the hepatitis B virus and HCV, with prevalence rates of 1.6% and 0.4%, respectively [
20]. In contrast, HCV prevalence among IDUs in Saudi Arabia ranged from 14.4% to 74% [
21]. In the U.S., 75–90% of long-term IDU showed hepatitis C seroprevalence [
22]. As the above numbers demonstrate, intravenous drug abuse is the main risk factor for HCV transmission [
23]. In light of these findings, our study was conducted to identify the prevalence of substance use disorders among HCV-infected patients, their sociodemographic characteristics, and the relationship between intravenous drug abuse and HCV infection.
Methods
Study design and participants
This cross-sectional study was conducted at the Gastrointestinal Tract Center, Baghdad Medical City, Baghdad, Iraq. The participants were hepatitis C-infected patients who attended the outpatient clinic of the Center to receive treatment and follow-up. The total patients were 1600; 310 patients were involved in the study according to an online sample size calculator with the following equation:
$${\text{n}}\, = \,[{\text{DEFF}}*{\text{Np}}\left( {{1} - {\text{p}}} \right)\left] {/ \, } \right[({\text{d}}^{{2}} /{\text{Z}}.^{{\mathbf{2}}}_{{{\mathbf{1}} - {{\varvec{\upalpha}}}/{\mathbf{2}}}} *\left( {{\mathbf{N}} - {\mathbf{1}}} \right)\, + \,{\mathbf{p}}*\left( {{\mathbf{1}} - {\mathbf{p}}} \right)].$$
Population size (N) = 1600
Hypothesized % frequency of outcome factor in the population (p): 50% ± 5
Confidence limits (d) = 5%
Design effect (DEFF) = 1
Z score = 1.96
Sample size = n.
Ten patients did not complete the interview, so the number of respondents was reduced to 300. The data were collected once a week from May 2017 to October 2017 and purposive sampling method was used. We included both genders who were medically stable and over 18. Those who were severely ill and declined to participate were excluded.
Data collection
All patients were subjected to the following:
1. Patients had to complete a form to determine their sociodemographic characteristics and HCV-related risk factors (age, gender, residence, occupation, education and marital status, and crowding index, which was determined by dividing the number of people living in the house by the number of rooms). The assessed risk factors related to HCV transmission include injection drug use, tattoos, surgery, dialysis, dental procedures, cupping, and blood transfusions.
2. Patients had to complete the WHO ASSIST (Arabic version) to screen for psychoactive substance use.
The Alcohol, Smoking, and Substance Involvement Screening Test (ASSIST) is a brief screening tool used in primary care and other settings to determine whether people use psychoactive substances. It was developed by the WHO and validated in Arabic as a simple method of screening for hazardous, harmful, and dependent use of substances [
24,
25]. There are eight questions on the ASSIST (the first seven inquire about the usage and problems associated with alcohol, tobacco, cocaine, cannabis, ATS, inhalants, sedatives, opioids, and hallucinogens; the eighth concentrates on injecting and inquires whether the patient has ever injected any drug). Accordingly, ASSIST provides information about:
Specific substance involvement scores for all substances except alcohol are scored as follows: 0–3 indicates low risk, 11–26 indicates moderate risk, and 27 + indicates high risk. For alcohol, 0–10 indicates low risk, 11–26 indicates moderate risk, and 27 + is associated with high risk. A low risk score means that there is a lower risk associated with the use of the involved substance, moderate risk score means harmful or hazardous use of that substance, and high-risk score means there is a high risk of substance dependence.
Statistical analysis
IBM© SPSS© (Statistical Package for the Social Sciences) Version 22 and Epi Info™ 7 were used for data tabulation, input, and coding. For descriptive analysis, frequencies were applied in various categories. The Chi-square test (95% confidence interval) was used to investigate the associations between variables; a p value of less than 0.05 was considered significant, while a p value less than 0.001 was considered highly significant.
Ethical approval
The aims of the study were explained to the patients before data collection, and all patients signed an informed consent form to participate in the study. All the data used in this study were kept confidential. The study was approved by the scientific council of psychiatry of the Arab Board for Health Specializations (No. 183, February 5th, 2017).
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