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Biomedical subjects

I Matheson

Publications and source records attributed to I Matheson.

At least 55 records · Page 3Linked to original sources
PubMed1988

Ampicillin in breast milk during puerperal infections.

Low concentrations of ampicillin were found in colostrum/breast milk from 6 mothers treated with pivampicillin 1.05 to 2.1 g daily during the first to eighth day postpartum in the maternity ward. It was calculated that the breast-fed infant could theoretically receive 0.05-0.37% of the dose/kg given to the mother. It is concluded that direct exposure of the breast-fed infant suckling from a mother under treatment with ampicillin or pivampicillin seems to be minimal.

Ampicillin↗
PubMed1988

Milk transfer of phenoxymethylpenicillin during puerperal mastitis.

1 The milk excretion of phenoxymethylpenicillin (PMP) was studied from both breasts in patients with mastitis (n = 12) and healthy volunteers (controls, n = 4) to investigate the hypothesis that milk transfer of PMP is higher in mastitic than in non-mastitic breasts. 2 Patients were included according to clinical symptoms of mastitis. Milk (and serum from controls) were sampled 0, 1, 2, 3, 4, 6 and 8 h after a single oral dose of 1320 mg PMP. Penicillin concentrations in milk and serum were measured by an agar diffusion technique. 3 Maximum milk concentrations (Cmax) of PMP in patients were higher (P less than 0.05) in mastitic than in non-mastitic breasts. The latter concentrations were higher (P less than 0.05) than those in breast milk from healthy controls. In milk from the mastitis patients (both breasts) the Cmax was reached after 2 h with a subsequent rapid decline in concentration. In milk from the healthy controls the PMP concentration reached a plateau after 4 h. The area under the milk concentration vs time curve (AUC0-8h) was not different for mastitic vs non-mastitic breast milk in patients nor for mastitic vs control breast milk. This can be explained by higher rates of appearance and disappearance of PMP in the breast milk of mastitis patients compared with healthy controls. In mastitic breast milk there was a moderate (P less than 0.01) increase in sodium and albumin compared with non-mastitic milk. However, milk potassium, glucose and lactose values were within normal limits.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1988

Bacteriological findings and clinical symptoms in relation to clinical outcome in puerperal mastitis.

Clinical symptoms, bacterial content in breast milk and treatment were recorded in 43 women in Oslo with puerperal mastitis. Patients with a favorable (n = 35) and unfavorable outcome (n = 8) (defined as abscess formation and/or symptom relief after more than 7 days) were compared. The group with unfavorable outcome was characterized by increased delay between symptoms and time for consultation, higher score of clinical symptoms and higher frequency of Staphylococcus aureus. A higher frequency of S. aureus was found in the affected breasts than in the unaffected breasts. There was no difference concerning the frequency of coagulase-negative staphylococci and overall bacterial counts, either between milk from affected and non-affected breasts, or between milk from non-affected breasts and milk from healthy donors. The present investigation indicates that penicillin treatment is questionable when considering that untreated cases healed almost as quickly as treated ones, and that 70% of the S. aureus strains were resistant to phenoxymethylpenicillin. It is concluded that present bacterial examinations in breast milk are of limited help in deciding who needs antibiotic treatment.

Adult↗
PubMed1987

Postmenopausal osteoporosis: no effect of three years treatment with 1,25-dihydroxycholecalciferol.

The therapeutic effect of 1,25-dihydroxycholecalciferol (1,25(OH)2D3) in postmenopausal osteoporosis was tested in a single blind, randomized prospective study. Thirty-nine women, 50-65 years of age, were treated for three years with 0.5 microgram 1,25(OH)2D3 daily. In a control group, 37 women were given 400 IU vitamin D3 daily. There was no significant difference in annual bone loss from the distal or proximal forearm between the groups. New vertebral fractures were evaluated, and in the treatment group, the annual increase in vertebral fractures was 0.18 +/- 0.387 and in the control group 0.13 +/- 0.330. New long bone fractures were 7 and 5, respectively. None of the observed differences were statistically significant. In the 1,25(OH)2D3 group, 28% had to reduce the dose because of slight hypercalcaemia. We conclude that 1,25(OH)2D3 as used in this study is not effective in the treatment of osteoporosis.

Aged↗
PubMed1986

Residual effect of single and repeated doses of midazolam and nitrazepam in relation to their plasma concentrations.

Twelve healthy volunteers were given either midazolam 15 mg or nitrazepam 5 mg for 7 consecutive days in a randomized cross-over trial. Self-assessment of sleep, mood or condition on awakening and adverse effects was performed, and the volunteers underwent evaluation of psychomotor performance. Hypnotic effect, judged by the classical sleep variables, showed that the drugs were more or less equal and were superior to placebo. Nitrazepam consistently produced an impaired condition on awakening and also clearly displayed a spectrum of adverse motor effects. Motor tests revealed impairment induced by both drugs, but, in the midazolam group the effect subsided during the trial period. Both drugs had a significant effect on memory, midazolam appearing to perturb certain memory functions to a greater extent than did nitrazepam. The residual plasma concentration of midazolam 11 h after treatment correlated well with the scores obtained in several of the psychomotor tests, whereas plasma nitrazepam levels were not related to performance in any subtest. When discontinued neither drugs, induced any rebound phenomenon. However, the adverse effects of nitrazepam appeared to be carried over into the adjacent placebo period.

Adult↗
PubMed1984

Presence of chlorprothixene and its metabolites in breast milk.

Chlorprothixene (CPX) and CPX sulphoxide were demonstrated in breast milk from two psychotic mothers taking 200 mg CPX daily. The milk concentrations of CPX were 120 to 260% greater than in plasma. The estimated amounts of drug administered in breast milk to one of the infants were 15 and 26 micrograms/day for CPX and CPX sulphoxide, respectively. Accordingly, the infant dose of the parent compound would be only 0.1% of the maternal dose/kg body weight. It is not likely that CPX or its metabolite would exert any immediate pharmacological effects in the nursing infant. However, the long term effect of low doses of neuroleptic drugs in the developing infants is not yet known.

Adult↗
PubMed1984

Pharmacokinetic considerations of misonidazole in therapeutics.

The pharmacokinetics of misonidazole have been studies in 6 patients with special emphasis on determination of the peak concentration in plasma and saliva. Frequent sampling was performed over 4 h and a marked variation in absorption half-life (range 4-125 min) and time to peak range (0.5-6.5 h) was found. The optimal timing of irradiation is discussed. In addition to a conventional dose, one of the patients received high dose misonidazole; the pharmacokinetics are compared.

Dose-Response Relationship, Drug↗
PubMed1983

A clinical pharmacological comparison of diclofensine (Ro 8-4650) with nomifensine and amitriptyline in normal human volunteers.

1 Ten healthy male volunteers participated in a double-blind placebo-controlled crossover comparison of the pharmacodynamic profiles of single oral doses of diclofensine 25 mg and 50 mg, nomifensine 75 mg and amitriptyline 50 mg. 2 Diclofensine did not influence salivary flow or consistently affect pupil diameter and had no significant effect on subjective measurements of sedation and mood. It had no effect on reaction time, or on critical flicker frequency. 3 By contrast, amitriptyline significantly reduced salivary flow, produced significant sedation and impairment of mood, prolonged reaction time, and appeared to decrease (but not significantly) critical flicker frequency. 4 Nomifensine significantly reduced (i.e. improved) reaction time, and inhibited salivary flow. 5 Diclofensine did not significantly influence heart rate, blood pressure, systolic time intervals or high speed electrocardiogram. 6 No significant treatment-related differences were observed in serum prolactin, cortisol or growth hormone levels.

Adolescent↗
PubMed1982

Short time prophylaxis with ornidazole in elective colo-rectal surgery.

A study of 100 patients given short time prophylaxis against anaerobic infections in association with colo-rectal surgery is presented. The patients were randomly allocated into two groups receiving either ornidazole (Tiberal) or doxycycline (Vibramycin) for 3 days. Ornidazole concentrations in serum, subcutaneous fat, and intestinal wall were measured in 10 patients. No infection of anaerobic etiology was noticed in the ornidazole group, in contrast to 5 anaerobic infections in the doxycycline group. This difference is statistically significant (p less than 0.05). The pharmacokinetic results indicate that a 3-day treatment with ornidazole gives a sufficient plasma steady state concentration, while the preoperative loading dose should be given less than 24 h prior to operation. The necessity of prophylaxis against both aerobic and anaerobic infections in colo-rectal surgery is emphasized.

Adipose Tissue↗
PubMed1978

Glucose and cation transport in rat jejunum, ileum and colon in vivo: effects of anionic and nonionic surfactants, and of desoxycholate.

Osmotically balanced solutions of glucose (0.5--300 mM) and sodium chloride, containing surfactants, were instilled into the small or large intestine of anaesthetized rats. Net absorption or secretion of glucose, sodium and potassium was studied. The surfactants tested were dodecylsulphate (3.4--17 mM), dioctylsulphosuccinate (1.8--11 m/M), Lubrol WX (0.1--5%), Triton X 100 (0.25%) and desoxycholate (2.5 mM). Qualitatively, the results were similar to those obtained previously with cationic compounds, suggesting a common mode of action for all surfactants studied. 17 mM dodecylsulphate seemed to abolish completely physiological glucose transport in the jejunum and ileum. At a lower concentration, and witth the other surfactants, normal glucose transport was affected to an intermediate extent.

Animals↗
PubMed1977

Plasma levels after a single oral dose of 1.5 g ornidazole.

Administration of a single oral dose of 1.5 g ornidazole to volunteers produced plasma levels which remained above the mean minimal trichomonicidal concentration for between 54 and 72 hours. A subjective feeling of dizziness was observed by all volunteers, but it was not possible to make a correlation between this and the drug levels in this study.

Adult↗