Effects of Smoking Cues on Tobacco Craving Responses and the Reinforcing Efficacy of Cigarettes in Smokers With and Without Schizophrenia
In this study, we will compare cue-reactivity in smokers with and without schizophrenia and the influence of smoking cues on responding for cigarette puffs under a PR schedule of reinforcement. Given the high prevalence of smoking among individuals with schizophrenia, understanding some of the environmental factors that serve to maintain nicotine dependence is a critical step in improving smoking cessation treatment outcomes. Establishing and validating a laboratory model of cue-elicited responsivity and cigarette self- administration will allow the investigation of the efficacy of anti-craving medications in people with schizophrenia.
Specific Aims 1) To compare the effects of smoking versus neutral cues on craving, mood, and autonomic responsivity in smokers with schizophrenia and smokers without schizophrenia. 2) To compare the effects of smoking versus neutral cues on the reinforcing efficacy of tobacco cigarettes in smokers with schizophrenia and smokers without schizophrenia.
Outcome Measures During cue trials, primary measures include craving (TCQ-SF, VAS), mood (mood form, VAS), and autonomic (heart rate, blood pressure, skin conductance and temperature) responsivity. During self-administration trials, primary measures include breakpoint (final ratio completed), total number of responses, and number of cigarette puffs earned and taken. Secondary measures include baseline smoking history, mood form, TCQ-SF, CO, FTND, and urinary cotinine and 3-hydroxycotinine (3-HC).
The ratio of 3-HC/cotinine is a phenotypic biomarker of the rate of nicotine metabolism, which has been shown to be associated with level of nicotine dependence, various smoking behaviors, and treatment outcome (Ho & Tyndale, 2007). We will correlate the primary measures with the 3-HC/cotinine ratio to explore possible relationships for future study.
調査の概要
研究の種類
入学 (予想される)
段階
- 適用できない
連絡先と場所
研究場所
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Maryland
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Catonsville、Maryland、アメリカ、21228
- Maryland Psychiatric Research Center (MPRC) Outpatient Research Program (ORP); the MPRC Treatment Research Program (TRP)
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria for Schizophrenia Patients
- 18-64 year old males and females
- Smoking at least 10 cigarettes per day for at least 1 year
- Urinary cotinine level ≥ 100 ng/ml (NicAlert® reading ≥ 3)
- Current DSM-IV diagnosis of schizophrenia and stable medication regimen (see above)
- Medically healthy as determined by screening criteria
Inclusion Criteria for Healthy Volunteers
- 18-64 year old males and females
- Smoking at least 10 cigarettes per day for at least 1 year
- Urinary cotinine level ≥ 100 ng/ml (NicAlert® reading ≥ 3)
- Medically and psychologically healthy as determined by screening criteria
Exclusion Criteria for Schizophrenia Patients
- Current interest in reducing or quitting tobacco use
- Treatment for tobacco dependence in the past 3 months
- Use of nicotine replacement products, bupropion, or varenicline in the past 3 months
- Consumption of more than 15 alcoholic drinks per week during the past month
- Use of any illicit drug more than twice per week during the past month
- Current use of any medication that would interfere with the protocol in the opinion of MAI (e.g., medications that would interfere with the cue reactivity portion of the study including, but not limited to, antidepressants, first-generation antipsychotics, and mood stabilizers)
- Under the influence of a drug or alcohol at experimental sessions
- Pregnant, nursing, or become pregnant during the study
Exclusion Criteria for Healthy Volunteers
- Current interest in reducing or quitting tobacco use
- Treatment for tobacco dependence in the past 3 months
- Use of nicotine replacement products, bupropion, or varenicline in the past 3 months
- Consumption of more than 15 alcoholic drinks per week during the past month
- Use of any illicit drug more than twice per week during the past month
- Current use of any medication that would interfere with the protocol in the opinion of MAI (e.g., medications that would interfere with the cue reactivity portion of the study including, but not limited to, antidepressants, antipsychotics, and mood stabilizers)
- Under the influence of a drug or alcohol at experimental sessions
- Pregnant, nursing, or become pregnant during the study
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：診断
- 介入モデル：クロスオーバー割り当て
- マスキング：独身
武器と介入
参加者グループ / アーム |
介入・治療 |
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実験的：Cues
Outcome Measures During cue trials, primary measures include craving (TCQ-SF, VAS), mood (mood form, VAS), and autonomic (heart rate, blood pressure, skin conductance and temperature) responsivity.
During self-administration trials, primary measures include breakpoint (final ratio completed), total number of responses, and number of cigarette puffs earned and taken.
Secondary measures include baseline smoking history, mood form, TCQ-SF, CO, FTND, and urinary cotinine and 3-hydroxycotinine (3-HC).
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In the smoking cue condition, a pack of the participants preferred brand of cigarettes, a lighter, and an ashtray will be under the tray cover.
In the neutral cue condition, a pack of unsharpened pencils, a pencil sharpener, and a small notepad will be under the cover.
When instructed, the participant will lift the cover on the tray.
In the smoking cue condition, participants will take one cigarette out of the pack, light it without puffing, hold it for 1 minute, extinguish the cigarette, and replace the cover on the tray.
In the neutral cue condition, participants will take one pencil out of the pack, sharpen it, hold it for 1 minute as if to write on the notepad, and then replace the cover.
Participants will complete the VAS during cue exposure and the TCQ-SF, VAS, and mood form immediately and 15 minutes after cue presentation; physiological measures will be recorded continuously.
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この研究は何を測定していますか？
主要な結果の測定
結果測定 |
時間枠 |
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To compare the effects of smoking versus neutral cues on craving, mood, and autonomic responsivity in smokers with schizophrenia and smokers without schizophrenia.
時間枠：7-10 Days
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7-10 Days
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協力者と研究者
捜査官
- 主任研究者：Stephen J Heishman, Ph.D.、National Institute on Drug Abuse (NIDA)
- 主任研究者：Deanna L Kelly, Pharm.D, BCPP、University of Maryland, College Park
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
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