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Biomedical subjects

N S Miller

Publications and source records attributed to N S Miller.

At least 37 records · Page 2Linked to original sources

A mouse model of Borrelia meningitis after intradermal injection.

Both young and adult C3H/HeN mice developed meningitis within 3 weeks of intradermal inoculation with a newly identified uncultivable Borrelia species, an agent of human relapsing fever. Meningoencephalitis with perivascular infiltrates and plexitis developed at approximately 25 days after inoculation. Infiltrates were composed of B and plasma cells and monocytes. This model recreated the meningitis associated with spirochetal infections through an intradermal route of infection.

Aging↗

A new Borrelia species isolated from patients with relapsing fever in Spain.

BACKGROUND: Lyme disease and tick-borne relapsing fever are worldwide systemic borrelioses caused by several Borrelia species transmitted by hard ticks (family Ixodidae) and soft ticks (family Argasidae), respectively. A previous seroepidemiological study of Lyme borreliosis showed several serologically reactive patients with clinically atypical presentations, and this discovery led to the hypothesis that some of the cases of Lyme borreliosis had been caused by another borrelia organism. METHODS: Blood from patients in southern Spain who had suspected Lyme disease or relapsing-fever borreliosis was cultured before treatment began. Isolates of Borrelia spp were inoculated into several strains of mice of different ages. The 16S rRNA and flagellin in genes of Borrelia spp were sequenced by PCR and assessed by phylogenetic analyses. FINDINGS: We isolated a species of Borrelia from three patients with relapsing fever and from Ornithodorus spp ticks in southern Spain. This organism (refractory to in-vitro cultivation) caused a relapsing spirochaetaemia with multiple organ involvement in laboratory mice that recreated the human disease. Phylogenetic analysis showed that this organism is a previously unrecognised species. INTERPRETATION: We have discovered a new borrelia pathogen that is closely related to the other tick-borne agents of relapsing fever in Europe and Africa, and which causes a relapsing systemic disease with serological similarities to Lyme borreliosis.

Animals↗

Pharmacotherapy in alcoholism.

This review categorizes five main uses of pharmacologic agents in the treatment of alcoholism: reversing the active pharmacologic effects of alcohol; controlling withdrawal symptoms; blocking the desire for alcohol use; treating psychiatric symptoms induced by alcohol and other drugs; and treating independent, but concurrent, psychopathologic conditions. No medication, including stimulants such as caffeine, has been found to actually reverse the action of alcohol. Because of their cross-tolerance and dependence with alcohol, benzodiazepines--especially intermediate acting preparations such as chlordiazepoxide and diazepam--are the mainstay in treating alcohol withdrawal, including convulsions and delirium tremens. Studies suggest that serotonin uptake inhibitors such as zimelidine, citalopram, viqualine, and fluoxetine may reduce alcohol consumption and that is not an antidepressant effect. Naltrexone, an opioid antagonist, also may be effective in reducing the urge to drink. The major aversive agent to alcohol in clinical use is disulfiram. When an independent psychiatric disorder accompanies alcoholism or drug addiction, it may require treatment, including pharmacotherapy, as the addiction is also being treated with nonpharmacologic methods such as abstinence-based treatment programs.

Alcohol Withdrawal Delirium↗

Treatment outcome for impoverished alcoholics in an abstinence-based program.

Positive patient characteristics have been assumed important in determining treatment outcome for the abstinence-based method of addiction treatment. Thus far, controlled and uncontrolled studies of the abstinence-based method have examined predominantly employed, White, and married populations of alcoholics. We present a treatment outcome study of the abstinence-based method of treatment in unemployed, Black, and unmarried population of alcoholics. The negative patient characteristics of our study did not predict an unfavorable outcome in comparison to those in other studies that included positive patient characteristics.

Adult↗

Dissociation of "conscious desire" (craving) from and relapse in alcohol and cocaine dependence.

Treatment of withdrawal and postabstinence craving has yielded mixed results in eliminating drug and alcohol use, improving outcomes, and reducing relapse in those patients addicted to alcohol and drugs. To assess the role of "conscious desire" (or craving) for drugs/alcohol during abstinence and withdrawal in continued addictive drug and alcohol use, we analyzed data from 1626 patients voluntarily admitted to a primary rehabilitation center in Minnesota. Eighty-one percent and 71% of all patients completed surveys at 6 and 12 months following discharge. Forty-two percent were diagnosed as alcohol dependent (AD) alone, 28% as alcohol and drug dependent (ADD) other than cocaine, and 25% as cocaine dependent (CD). At 6 months following discharge, the CD group had the lowest abstinence rate for drugs, at 83%, compared to the AD group, at 99%, and for alcohol, at 76%, compared to the AD group, at 75%. The AD group had the best outcomes and the least slippage from 6 to 12 months for drugs and alcohol. In all groups craving was not a major self-reported cause of relapse. For the CD subgroup, impulsive action with no known cause was the most common reason for relapse, while the AD group cited depression. These data agree with other reports in the literature suggesting that relapse is not commonly related to conscious craving. Our experience suggests that craving is rarely the first reason given for relapse. Drug seeking and use are such highly ritualized, automatic behaviors that the addict may appear not to require the intervention of conscious thoughts or distinct craving states to use.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

Criminal activity and crack addiction.

The association of crack and criminal activity is commonly believed but not well documented or characterized in any systematic studies of crack addicts. In this survey of 200 crack addicts, daily use of crack correlated more with illicit, criminal activities to obtain a supply of crack than to demographic features. Correspondingly, felony and cocaine dealing was associated with total dollars spent on cocaine but not to other demographic features such as level of property or affluence. Moreover, the majority of crack addicts in this sample used cocaine intranasally before starting crack use. The mean age from onset of crack use to seeking help for cocaine addiction is less than 3 years. Severity of crack use and addiction as measured by daily use was associated with psychosocial consequences more than other demographic features.

Adolescent↗

Cocaine dependence: alcohol and other drug dependence and withdrawal characteristics.

In this study, a cocaine abstinence syndrome is confirmed. Moreover, the cocaine withdrawal syndrome was found to be medically and psychiatrically benign and required no medication for detoxification in this inpatient setting. The 150 patients who underwent cocaine withdrawal did not show the three distinct phases of the abstinence symptomatology previously described. No patients required pharmacological intervention for cocaine withdrawal, and the dropout rate was 8% of the 150 cocaine dependents. The common symptoms of acute cessation of cocaine were transient craving, hyperactivity, slight tremor, insomnia and apprehension. The diagnosis of cocaine dependence alone without an additional drug or alcohol diagnosis was unusual in this study at 5%, as is the solitary use of cocaine also uncommon according to other studies. Studies clearly document that the concurrent and simultaneous use and dependence on multiple drugs and alcohol is present in the majority of treatment populations and common in the general population. As many as 54% of cocaine dependents qualified for alcohol dependence in this study, and many were dependent on alcohol prior to their cocaine dependence. Cocaine dependence appears to be yet another diagnosis in the spectrum of the multiple drug and alcohol dependent.

Adolescent↗

Comorbidity of psychiatric and alcohol/drug disorders: interactions and independent status.

Dual diagnosis as interpreted in clinical psychiatric practice is often not what the term means-two independent disorders. Commonly, addiction disorders are attributed to self medicating of "underlying" psychiatric disorders, there by, a contingency status. However, studies and clinical addiction practice show that drug and alcohol addiction must be afforded an independent status before accurate assessment and assignment of interactions in dual diagnosis can be made in clinical conditions. Studies also show rates for psychiatric comorbidity are low in addiction populations and rates for addictive disorders are high in psychiatric populations. If the common denominator is taken as addiction, then the perspective of the setting and examiner become crucial in determining prevalence rates for both disorders. Most importantly, effective treatment of either disorder will not occur unless an agreement on an independent status is accepted for both addictive and psychiatric disorders in any patient population setting.

Alcoholism↗

The epidemiology of the comorbidity of psychiatric and addictive disorders: a critical review.

Assessing the prevalence of the comorbidity of psychiatric and addictive disease using epidemiologic methods results in artifactually high rates. Use of a clinical sample will yield falsely high rates, because substance use is associated with exacerbation of mental illness. Cross sectional design will inflate rates of psychiatric comorbidity in addicts, who attribute substance use to psychological symptoms until well into recovery. Application of exclusionary criteria for independent diagnosis is subject to investigator bias, particularly about the unproven yet popular "self-medication" hypothesis. The psychiatric symptoms which are common in active addiction generally clear within weeks to months of treatment for addiction but do not respond to standard psychopharmacologic treatment for primary mental illness. When lengthy follow up periods are employed, substance induced psychiatric syndromes typically resolve. We conclude that while patients treated in psychiatric settings often have comorbid and independent addictive illness, patients treated in addiction settings uncommonly have comorbid psychiatric illness despite common psychiatric symptoms.

Comorbidity↗

Evaluation and acute management of psychotic symptomatology in alcohol and drug addictions.

The practical clinical evaluation of patients manifesting psychotic symptomatology and addictive illness is approached in diverse and contradictory ways. While addiction specialists may not recognize the existence of Axis I disorders that prevent the utilization of treatment in the system, trained mental health professionals are traditionally prone to deny or minimize the addictive process and its capacity to produce psychiatric symptoms. This may result in premature diagnosis, and in a poor response to psychiatric treatment. The purpose of this paper is to describe a pragmatic model, based on clinically observable conditions, for the evaluation and acute management of major psychiatric symptomatology associated with diagnosed drug and alcohol addiction. Before describing the model, psychotic illness and symptoms in the general population versus the drug and alcohol addicted will be examined. The model will be applied to a few discrete syndromes based on common clinical presentations.

Female↗

Current epidemiology of comorbidity of psychiatric and addictive disorders.

Some major epidemiologic studies have assumed that treatment of the psychiatric symptoms will result in a lowered morbidity and mortality from the addictive disorders or, more specifically, that the addictive disorders are dependent on the psychiatric disorders and etiologically linked to them as an effect or secondary consequence. There is little systematic evidence beyond anecdotal and intuitive supposition to support this popular and only hypothetic position. The consequence is that to insist on the priority of the psychiatric disorder in diagnosis and treatment is to perpetuate artifactual prevalence rates for psychiatric comorbidity in addictive disorders, and to preclude the definitive treatment to reduce the psychiatric morbidity and mortality caused by addictive disorders.

Comorbidity↗

A hypothesis for a common neurochemical basis for alcohol and drug disorders.

Research findings clearly support a uniform theory for a neurochemical basis of drug and alcohol addiction. Data are available that document final common pathways for addictive behaviors in the limbic system in which neurotransmitters modulate the drive states, mood, and instinctual behaviors. The specific areas in the brain implicated in the loss of control inherent in the addictive use of multiple drugs and alcohol are the ventral tegmentum, nucleus accumbens, locus ceruleus, dorsal raphe nuclei, and the periaquaductal grey area. These sites contain cell bodies and receptors for dopamine, norepinephrine, serotonin, and endogenous opiates respectively, where multiple drugs and alcohol can often produce their effects. The acquired drive of addiction that arises spontaneously, repetitively, and relentlessly is manifested in the addictive behaviors of preoccupation, compulsivity, and relapse to drugs and alcohol.

Alcoholism↗

Perspectives of effective treatment for alcohol and drug disorders.

Of the 1918 patients in the follow-up sample used for illustration, 63% reported total abstinence for the year after treatment, and an additional 24% reported at least 6 months of abstinence out of 12. Most relapses occurred during the first 6-month interval; 88% of patients who were abstinent the first 6 months maintained this status for the full year. Patients abusing drugs other than alcohol had much poorer outcomes than those abusing alcohol only, and this finding held up even when drug choice was controlled for sex and age of patients. Intravenous drug use was an important predictor of relapse, as was a history of antisocial behavior. A strong relationship to outcome was seen for patient participation in an aftercare program, and for weekly attendance at peer support group meetings. Emotional distress, relationship difficulties and family problems, financial difficulties, craving, and being around others who use alcohol and drugs are all seen as making the commitment to abstinence more difficult. There is clear evidence also that increased difficulty in these areas is predictive of later relapse. Comparisons of pretreatment and posttreatment measures of patient functioning revealed a decreased need for expensive health care services, such as hospitalization and emergency room care. The motor vehicle accident rate, traffic arrest rate, and criminal offense arrest rate all showed posttreatment declines. On-the-job problems also decreased dramatically following treatment. Posttreatment difficulties were disproportionately higher among patients who had returned to substance use than among patients who remained abstinent, documenting that successful treatment can have an affect in many areas that improve the quality of life for patients themselves (along with their families and communities) as well as reduce the high economic costs associated with alcohol and drug abuse in our society. Cost offsets for chemical dependency treatment are substantial and of broad scope; they also are related directly to the recovery rate. In general, the findings for outpatient programs tend to parallel those of the inpatients. Initial chemical severity and range of other clinical problems are lower, but significant reductions are noted. For both inpatients and outpatients monitored by CATOR, the posttreatment improvement in health care utilizations, reductions in work-related problems, and fewer arrests are related directly to recovery status. That is to say that recovering patients show significantly better improvement than relapsed patients. This means that treatment efficacy must be considered as a key element in estimating treatment benefits.

Alcoholism↗

Measurement of histamine in rat bronchoalveolar lavage fluid by high-performance cation-exchange chromatography coupled with post-column derivatization to o-phthaldialdehyde.

To better define involvement of mast cell derived mediators in the pulmonary response to fibrogenic dusts, a rapid and accurate method was required to analyze samples of bronchoalveolar lavage fluid for histamine. Samples of rat lung lavage were analyzed for histamine via high-performance cation-exchange chromatography coupled with post-column derivatization with o-phthaldialdehyde. The fluorescent derivative could be detected to ca. 1 ng/ml of lavage. Recoveries averaged 94.2% with an average relative standard deviation of +/- 5.3%. There were no correlations between amount or fibrogenicity of inhaled dust and subsequent release of histamine into lavage fluid.

Animals↗