Acute rewarding and disinhibiting effects of alcohol as indicators of drinking habits

Self-underestimation of BAC as a predictor of risky driving in heavy drinkers

BACKGROUND

Alcohol-related driving fatalities persist as a public health issue in the United States. Recent studies have focused on the role of driver risk-taking in DUI occurrences and consequent driving fatalities. This laboratory study examined simulated driver risk-taking under an acute dose of alcohol and a placebo to test the degree to which individual differences in risk-taking were predicted by drivers' self-appraisal of their intoxication and the degree to which alcohol impaired their inhibitory control.

METHODS

Eighty young adult drivers (41 men and 39 women) received 0.65g/kg alcohol (target BAC=80mg/dL) or a placebo in a counterbalanced order on two different days and performed a simulated driving test that measured driver risk-taking as reduced distance to other vehicles. A cued go/no-go task measured drivers' inhibitory control, and their perceived intoxication was assessed via self-reported intoxication and BAC estimation.

RESULTS

Compared with placebo, alcohol increased driver risk-taking, impaired inhibitory control, and increased perceived intoxication. The riskiest drivers under alcohol were those with the lowest estimations of their BAC. Tolerance to the subjective effects of alcohol might explain this relationship as the underestimators had heavier drinking histories.

DISCUSSION

The findings indicate that risky driving under alcohol could result in part from BAC underestimation, possibly owing to the development of alcohol tolerance. Sustained heavy drinking might reduce perceived intoxication and, consequently, the perceived need to compensate for potential impairing effects of alcohol while driving. The evidence suggests that drivers' proclivity to risk-take under alcohol might depend largely on their self-appraisal of intoxication.

Cyp3A4 *1G polymorphism is associated with alcohol drinking: A 5-year retrospective single centered population-based study in China

INTRODUCTION

We investigated the epidemiology of Cytochrome P450 (CYP) 3A4 genotype and the relationship between CYP3A4 genotype and alcohol drinking habits.

MATERIALS AND METHODS

A single-centered retrospective study was conducted on 630 patients who underwent CYP3A4*1G genetic testing. Their relevant information on epidemiology and etiology was collected. Laboratory testing, including CYP3A4*1G genotype, liver function tests, and serum lipid measurements were performed. Bi-variate logistic regressions were used to examine the relationship between variables. The relationship between alcohol drinking and CYP3A4*1G genotype was estimated. Demographic and clinical features were analyzed. Participants with drinking history were divided into non-heavy drinking and heavy drinking groups. Liver function and dyslipidemia of participants with drinking histories were compared between CYP3A4*1G mutation (GA+AA) and wild-type (GG) groups.

RESULTS

Participants with CYP3A4*1G mutation(GA+AA) had an increased adjusted odds ratio (AOR) of 2.56 (95% CI, 1.4-4.65; P = 0.00) for alcohol abuse when compared with participants without CYP3A4 mutation (GG). In the subgroup of participants with alcohol abuse, there are no significant differences in liver injury levels and serum lipid levels between CYP3A4*1G mutant and wild-type groups. Patients with CYP3A4*1G mutation had an increased AOR of cardiac-vascular diseases and malignant diseases compared with patients without CYP3A4*1G mutation. The epidemiology had no difference between GA and AA group.

CONCLUSION

The study indicated that there was association between alcohol drinking and CYP3A4*1G genetic mutation. In the subgroup of participants with alcohol abuse, there are no significant differences in liver injury and dyslipidemia between CYP3A4*1G mutant and wild-type groups. CYP3A4*1G mutation was also related to cardiac-vascular diseases and malignant diseases.

Cognitive preoccupation with drinking and behavioral effects of alcohol as predictors of current consumption patterns

BACKGROUND

Acute alcohol responses such as tolerance to alcohol-induced motor impairment and heightened sensitivity to alcohol-induced disinhibition are associated with heavier drinking. Additionally, certain cognitive characteristics may also indicate problem-drinking. For example, cognitive and emotional preoccupation (CEP) with alcohol is associated with heavier drinking. However, it is not clear if cognitive markers have value as predicators of heavier drinking beyond that of well-established alcohol response markers. The current study sought to test the predictive potential of CEP in the context of two well-documented alcohol response markers of heavy drinking.

METHODS

Data aggregated from three studies comprised a sample of 94 young adult drinkers with no history of alcohol use disorder. Participants' motor coordination (grooved pegboard) and behavioral disinhibition (cued go/no-go) were assessed following consumption of 0.65g/kg alcohol and a placebo. CEP was measured via the Temptation and Restraint Inventory (TRI).

RESULTS

Drinkers who expressed both alcohol response markers reported drinking higher doses regardless of their level of CEP. Among drinkers who expressed low sensitivity to both disinhibition and motor impairment, higher CEP was associated with higher typical quantities. Low sensitivity to motor impairment functioned as a standalone marker of heavier drinking.

CONCLUSIONS

The findings suggest that a combination of tolerance to motor impairment and high alcohol-induced disinhibition may be sufficient to promote heavier consumption even in the absence of cognitive markers associated with problem drinking. Results also suggest that cognitive characteristics may drive early drinking and contribute to the development of tolerance to acute alcohol effects.

Heightened motor impairment as a protective factor against heavy drinking in individuals with high alcohol-induced disinhibition

BACKGROUND

Behavioral disinhibition and motor impairment are both acutely elevated following alcohol consumption, and individual differences in sensitivity to alcohol-induced increases in these effects are associated with drinking habits. Specifically, high alcohol-induced disinhibition and low motor impairment have been identified as separate markers for alcohol-related problems. This study tested the degree to which alcohol-induced disinhibition and motor impairment jointly predict heavy drinking. We hypothesized that heavier drinkers would exhibit a combination of high sensitivity to alcohol-induced disinhibition and low sensitivity to its motor impairing effect.

METHODS

Data from three studies were aggregated to comprise a sample of 96 young adults. Participants' motor coordination (grooved pegboard) and behavioral disinhibition (cued go/no-go) were assessed following consumption of 0.65 g/kg alcohol and a placebo during separate sessions.

RESULTS

As BAC was ascending, alcohol increased motor impairment and disinhibition compared to placebo. Combined effects at this time of alcohol on motor impairment and disinhibition predicted typical drinking habits. Specifically, a combination of high sensitivity to alcohol's disinhibiting effect and low sensitivity to its motor impairing effect was associated with heavy drinking. As BAC was descending, only reduced sensitivity to motor impairment remained as a predictor of heavy drinking.

CONCLUSIONS

The findings suggest that although motor impairment following alcohol consumption is associated with certain negative outcomes (e.g., increased risk for physical injury and motor vehicle accidents), such heightened motor impairment from alcohol may actually serve as a protective factor against the excessive drinking that can accompany the disinhibiting effect of alcohol.

Assaultive trauma, alcohol use, and alcohol-related consequences among American Indian adolescents

BACKGROUND

American Indian (AI) adolescents report disproportionate higher rates of alcohol use and alcohol-related consequences than adolescents from other racial/ethnic groups. Trauma exposure is also reported at high rates among AI individuals and likely confers risk for alcohol use. The purpose of the present study was to examine the effects of assaultive trauma experiences (e.g., physical assault, sexual assault) on alcohol use and alcohol-related consequences in AI adolescents.

METHODS

We conducted a secondary analysis of self-reported data on trauma exposure, alcohol consumption, and lifetime alcohol-related consequences provided by AI 7th to 12th graders residing on or near a reservation (n = 3498, M_age  = 14.8; 49.5% female). Institutional Review Boards, tribal authorities, and school boards approved the study protocols prior to beginning data collection.

RESULTS

Nearly half (49.3%, n = 1498) of AI adolescents reported having experienced at least one assaultive trauma in their lifetime. Those who had experienced assaultive trauma were more likely to report lifetime alcohol use (χ²  = 111.84, p < 0.001) and experienced greater alcohol-related consequences (t(1746) = 12.21, p < 0.001) than those with no assaultive trauma exposure. Multilevel regression analyses indicated that a greater number of assaultive traumatic events was significantly associated with greater odds of lifetime alcohol use (p < 0.001, OR = 1.81, 95% CI [1.65, 2.00]) and having experienced a greater number of alcohol-related consequences (b = 0.36, SE = 0.04, t = 16.95, p < 0.001, 95% CI [0.31, 0.46]).

CONCLUSIONS

Findings of the present study highlight the relevance of exposure to assaultive trauma to AI adolescents' use of alcohol and experiences of alcohol-related consequences. These findings support the need for trauma-informed interventions in addressing alcohol use among AI adolescents.