Cannabis use and neurocognitive performance at 13-14 Years-Old: Optimizing assessment with hair toxicology in the Adolescent brain cognitive development (ABCD) study

OBJECTIVE

Cannabis is widely used, including in early adolescence, with prevalence rates varying by measurement method (e.g., toxicology vs. self-report). Critical neurocognitive development occurs throughout adolescence. Given conflicting prior brain-behavior results in cannabis research, improved measurement of cannabis use in younger adolescents is needed.

METHODS

Data from the Adolescent Brain Cognitive Development (ABCD) Study Year 4 follow-up (participant age: 13-14 years-old) included hair samples assessed by LC-MS/MS and GC-MS/MS, quantifying THCCOOH (THC metabolite), THC, and cannabidiol concentrations, and the NIH Toolbox Cognitive Battery. Youth whose hair was positive for cannabinoids or reported past-year cannabis use were included in a Cannabis Use (CU) group (n = 123) and matched with non-using Controls on sociodemographics (n = 123). Standard and nested ANCOVAs assessed group status predicting cognitive performance, controlling for family relationships. Follow-up correlations assessed cannabinoid hair concentration, self-reported cannabis use, and neurocognition.

RESULTS

CU scored lower on Picture Memory (p = .03) than Controls. Within the CU group, THCCOOH negatively correlated with Picture Vocabulary (r = -0.20, p = .03) and Flanker Inhibitory Control and Attention (r = -0.19, p = .04), and past-year cannabis use was negatively associated with List Sorting Working Memory (r = -0.33, p = .0002) and Picture Sequence Memory (r = -0.19, p = .04) performances.

CONCLUSIONS

Youth who had used cannabis showed lower scores on an episodic memory task, and more cannabis use was linked to poorer performances on verbal, inhibitory, working memory, and episodic memory tasks. Combining hair toxicology with self-report revealed more brain-behavior relationships than self-report data alone. These youth will be followed to determine long-term substance use and neurocognition trajectories.

Substance use onset in high-risk 9-13 year-olds in the ABCD study

AIM

A key aim of the Adolescent Brain Cognitive Development℠ (ABCD) Study is to document substance use onset, patterns, and sequelae across adolescent development. However, substance use misreporting can obscure accurate drug use characterization. Hair toxicology provides objective historical substance use data but is rarely used in studies of youth. Here, we compare objective hair toxicology results with self-reported substance use in high-risk youth.

METHODS

A literature-based substance use risk algorithm prioritized 696 ABCD Study® hair samples from 677 participants for analysis at baseline, and 1 and 2-year follow-ups (spanning ages 9-13). Chi-square and t-tests assessed differences between participants' demographics, positive and negative hair tests, risk-for-use algorithm scores, and self-reported substance use.

RESULTS

Hair testing confirmed that 17% of at-risk 9-13 year-olds hair samples had evidence of past 3-month use of one (n = 97), two (n = 14), three (n = 2), or four (n = 2) drug classes. After considering prescribed medication and self-reported substance use, 10% had a positive test indicating substance use that was not reported. Participants with any positive hair result reported less sipping of alcohol (p < 0.001) and scored higher on the risk-for-use algorithm (p < 0.001) than those with negative toxicology results.

CONCLUSIONS

10% of hair samples from at-risk 9-13 year-olds tested positive for at least one unreported substance, suggesting underreporting in high-risk youth when participating in a research study. As hair testing prioritized youth with risk characteristics, the overall extent of underreporting will be calculated in future studies. Nonetheless, hair toxicology was key to characterizing substance use in high-risk youth.

Evaluation of drug-endangered children: The yield of toxicology and skeletal survey screening

BACKGROUND

Drug endangerment is known to be associated with child maltreatment. However, even with the high association between physical abuse and drug endangerment there is no standard for screening in this population. Skeletal survey screening may facilitate the identification of children in this population who have also been physically abused.

OBJECTIVE

Our objective was to determine the characteristics of drug endangered children and specifically the yield of skeletal survey screening.

PARTICIPANTS AND SETTING

The participants in this study were children referred by Child Protective Services (CPS) due to concerns of drug exposure. They were seen in a child abuse outpatient clinic by a child abuse pediatrician or pediatric nurse practitioner.

METHODS

This study is a retrospective chart review of the Child Advocacy Resource and Evaluation (C.A.R.E.) Team records between January 1, 2011 and December 31, 2017. We measured the yield of toxicology, additional abuse endured, and skeletal survey findings.

RESULTS

Over the 6-year period, 1252 cases were referred to C.A.R.E. Team for drug endangerment. 1150 cases had hair toxicology performed with 595 cases (52%) testing positive for at least one illegal substance. The compound most frequently identified was methamphetamine followed by marijuana and cocaine. In addition to drug endangerment, other forms of abuse were identified in 162 cases including sexual, physical, and neglect. Using the American Academy of Pediatrics (AAP) and American College of Radiology (ACR) guidelines, 340 skeletal surveys were performed. Twelve cases (4%) had occult skeletal injuries none of which had cutaneous findings. Of those with skeletal injury, 11 cases out of 11 tested by hair toxicology were positive for at least one illegal substance.

CONCLUSIONS

The application of the AAP and ACR guidelines for skeletal survey screening to those children referred for drug endangerment is useful in identifying children with physical abuse.