Biomedical subjects
Publications and source records attributed to J T Biggs.
Apical closure of nonvital teeth can be achieved by appropriate endodontic intervention. A case is reported in which apical maturation appears to have occurred without treatment and in the presence of sporadic drainage from a sinus tract stoma.
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The present study related patterns of alcohol-related cognitive deficits to the adjustment of the alcoholic at 2-year posttreatment follow-up. Patterns of cognitive control, based on the extent to which the individual utilized information concerning contemplated action (i.e., internal scanning), were studied within a sample of 42 male alcoholics shortly after the beginning of treatment. Adjustment scores at 2-year follow-up were determined by the subject's level of functioning in a variety of life-functioning domains (based on phone interviews with subjects and collateral sources). More effective internal scanning proved to be predictive of better adjustment 2 years following the assessment. In addition, alcoholics less aware of internal cues, defined as narrow internal scanners, more often reported drinking to reduce tension than did broad scanning alcoholics. The narrow internal scanning alcoholics also were slower learners at an electromyographic biofeedback training task than were the broad internal scanning alcoholics. These findings are interpreted in the context of a cognitive typology of alcoholism based on relative skills/deficits in internal cue processing. Factors relating to differential responsivity to treatment are discussed, and concomitant implications for treatment are noted.
The pharmacokinetics of TCAs are reviewed with particular emphasis on nortriptyline, the agent most extensively studied. The clinical uses of TCA plasma level-response studies are discussed in relationship to rational dosage adjustment to increase response rates and avoid iatrogenic toxicity. Other important topics discussed include the issue of active metabolites, single-dose prediction studies, and special considerations in treating the elderly and the medically ill.
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This study compared serial severity ratings from 2 methodologically similar tricyclic antidepressant studies. Though the groups resembled each other in terms of diagnosis and baseline severity, response patterns were surprisingly different. In particular, early change was highly predictive of outcome in one group but not in the other. The results of response predictor studies must, therefore, be generalized with caution. These data, nevertheless, do allow some guidelines for predicting response from early changes and severity.
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Data collected to define therapeutic plasma levels for amitriptyline and nortriptyline were re-analyzed to test endogenous and non-endogenous symptoms as response predictors while controlling for plasma level variable. The selection criteria limited the range of historical predictors. Initial symptom quality was not predictive of outcome for the entire group of 44 patients or for the 27 with therapeutic plasma levels. Delusions were not associated with poor outcome. The authors conclude that historical components of the endogenous--non-endogenous distinction (e.g., premorbid personality, stability of symptoms over time, quality of remissions) may be more important as response predictors.
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In areas lacking public water supplies and where fluoride is not naturally present in the well water, school fluoridation programs have been shown to be effective and safe. Reductions of up to 38.9% in the rate of dental decay have been reported. Higher levels of fluoride are used in the school water than in public water because of the limited time the children are in school. The relatively low cost of the necessary equipment and chemicals can easily be justified by taking into account the amount of dental decay that can be prevented. Interested parents, teachers, or administrators should contact their state health department for technical assistance.
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The kinetics of doxepin (DOX) hydrochloride were studied in 7 volunteers after the oral administration of 75 mg. Peak plasma concentrations of DOX ranged from 8.8 to 45.8 ng/ml and were reached within 4 hr. The disappearance of DOX was biphasic and followed first-order kinetics. The mean DOX half life (t1/2) was 16.8 hr and in individuals ranged from 8.2 to 24.5 hr. The mean apparent volume of distribution was 20.2 L/kg and ranged from 9.1 to 33.3 L/kg. The estimated first-pass metabolism of DOX ranged from 55% to 87% of the oral dose assuming complete absorption. Significant quantities of the metabolite desmethyldoxepin (DMD) were produced. Peak levels of DMD ranged from 4.8 to 14.5 ng/ml and were reached between 2 and 10 hr after administration. The mean t1/2 of DMD was 51.3 hr and in individuals ranged from 33.2 to 80.7 hr. There was no correlation between the DOX and DMD t1/2s. The amount of DMD produced correlated with the plasma concentration of DOX and appears to explain the correlation between the steady-state concentrations of DOX and DMD in patients given DOX.
The kinetics of protriptyline were examined in 8 subjects after a single oral dose of 30 mg protriptyline hydrochloride. Peak protriptyline levels ranged from 10.4 to 22.3 ng/ml and were reached 6 to 12 hr after the oral dose. The mean protriptyline half-life (t1/2) was 74.3 hr and ranged from 53.6 to 91.7 hr in individual subjects, confirming the long t1/2 of protriptyline reported by Moody and associates. The estimated first-pass metabolism of protriptyline was relatively small, ranging from 10% to 25% of the oral dose, assuming complete absorption. The mean volume of distribution was 22.5 L/kg and ranged from 15.0 to 31.2 L/kg. No relationship was found between the kinetics of protriptyline and those of doxepin studied previously in 7 of the 8 subjects.