Open secret, or imagined problem: Drug and alcohol use in Tanzanian road traffic accident drivers

Abstract Background Road traffic accidents (RTAs) have emerged as an important public health problem in low and middle-income countries, where 90% of RTA deaths occur. The World Health Organization has suggested strategies to address excess mortality from RTAs including efforts to combat driving while intoxicated. The association between substance use and RTAs is well known in high-income countries, but data is more limited in low-resource settings including Tanzania. The objective of this study is to examine the prevalence of drug use, alcohol use, and substance use disorders in Tanzanian RTA drivers. Methods This prospective observational study was conducted in the Emergency Department of Muhimbili National Hospital, a national referral hospital in Dar es Salaam, Tanzania. Research assistants available 24 hours per day enrolled adult drivers who presented within 24 hours of an RTA. In eligible patients, research assistants collected a saliva test of blood alcohol content (BAC) and a urine drug screen (UDS), and administered a validated substance abuse screening tool, the Alcohol, Smoking and Substance Involvement Screening Test (ASSIST), Patients were excluded from individual analyses if they could not produce a saliva or urine test or answer questions. Primary outcomes were rates of positive BAC, UDS and self-reported high-risk alcohol and drug use patterns. Descriptive statistics were calculated using Excel. Results We screened 5264 trauma patients and enrolled 538, in whom 191 had a BAC, 362 had a UDS, and 417 had a complete ASSIST. Fifteen of 191 patients (7.8%) had a positive BAC, and 68/362 (18.7%) patients had a UDS that was positive for at least one drug. Based on the ASSIST, 104/417 (24.5%) of patients were at moderate or high risk for alcohol use disorder. Few were at risk for disordered use of other non-tobacco substances. Conclusion In our population of drivers presenting within 24 hours of an RTA, positive BAC and UDS tests were rare. A substantial portion of the population was at moderate to high risk for an alcohol use disorder. Ideal screening for substance use in trauma populations may involve a verbal screening tool, particularly when the time between injury and hospital arrival is delayed.