ABSTRACT
Studies were conducted to investigate the clinical characteristics of naloxone-precipitated withdrawal in human opioid-dependent subjects. Each of 20 male patients stabilized on 24 mg of methadone daily received two i.v. pharmacological challenges: one with naloxone (0.05, 0.10, 0.15 and 0.20 mg; five patients each dose), and one with saline placebo. Measures of opioid withdrawal, affective state, cognitive performance and changes in autonomic parameters were assessed after each pharmacological challenge. Naloxone produced dose-dependent increases in opiate withdrawal scale scores and in symptoms of dysphoria as measured by the Profile of Mood States. Differences within subjects between naloxone and placebo infusions in Profile of Mood States scores were highly correlated with differences in opioid withdrawal as assessed by both subjective and objective rating scales. Naloxone also produced substantial increases in pulse, systolic and diastolic blood pressure and respiratory rate, as well as a small decrease in temperature. However, naloxone-induced changes from base-line values in these autonomic parameters correlated only modestly with other measures of opioid withdrawal. No differences between infusions were observed in two measures of cognitive performance (Stroop Color and Word Test, Digit Span Test). The results indicate that dysphoric mood states reflecting a broad range of affective experience must be considered as integral components of the naloxone-precipitated opioid withdrawal syndrome.
Subject(s)
Naloxone/therapeutic use , Narcotics/adverse effects , Substance Withdrawal Syndrome/drug therapy , Adult , Blood Pressure/drug effects , Body Temperature/drug effects , Cognition/drug effects , Dose-Response Relationship, Drug , Humans , Infusions, Intravenous , Male , Methadone/therapeutic use , Middle Aged , Respiration/drug effects , Substance Withdrawal Syndrome/physiopathologyABSTRACT
Two new rating scales for measuring the signs and symptoms of opiate withdrawal are presented. The Subjective Opiate Withdrawal Scale (SOWS) contains 16 symptoms whose intensity the patient rates on a scale of 0 (not at all) to 4 (extremely). The Objective Opiate Withdrawal Scale (OOWS) contains 13 physically observable signs, rated present or absent, based on a timed period of observation of the patient by a rater. Opiate abusers admitted to a detoxification ward had significantly higher scores on the SOWS and OOWS before receiving methadone as compared to after receiving methadone for 2 days. Opiate abusers seeking treatment were challenged either with placebo or with 0.4 mg naloxone. Postchallenge SOWS and OOWS scores were significantly higher than prechallenge scores in the naloxone but not the placebo group. We have demonstrated good interrater reliability for the OOWS and good intrasubject reliability over time for both scales in controls and in patients on a methadone maintenance program. These scales are demonstrated to be valid and reliable indicators of the severity of the opiate withdrawal syndrome over a wide range of common signs and symptoms.
