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Biomedical subjects

G Wolf-Klein

Publications and source records attributed to G Wolf-Klein.

7 recordsLinked to original sources

Determination of normal ear temperature with an infrared emission detection thermometer.

STUDY OBJECTIVE: To determine normal body temperature with an infrared emission detection ear thermometer. DESIGN: Cross-sectional convenience sample. SETTING: Four acute and long-term health care facilities. PARTICIPANTS: Subjects who denied recent potentially febrile illness and ingestion of medications affecting normal body temperature. RESULTS: Two thousand four hundred forty-seven subjects aged 12 hours to 103 years were enrolled. Ear temperatures were normally distributed for each of eight age groups. There were differences in mean temperature among different age groups (P < .001, by ANOVA) and a striking cutoff at adolescence; the mean temperature for children aged 3 days to 10 years was 36.78 +/- 0.47 degrees C, as compared to 36.51 +/- 0.46 degrees C for subjects 11 years and older (P < .001, by t test). Temperatures were higher in female subjects and showed the characteristic diurnal variation of normal body temperature in five subjects studied longitudinally. The reproducibility of the ear thermometer was better than that of a commonly used electronic thermometer at the oral and axillary sites. CONCLUSION: The infrared emission detection ear thermometer is an accurate means of assessing normal body temperature without using corrective offsets to estimate temperature at other body sites. On the basis of these data, the 95th percentile for infrared emission detection temperature in children younger than 11 years old was 37.6 degrees C. The 99th percentile was 37.9 degrees C for children younger than 11 years old and 37.6 degrees C for people 11 years or older. Because only 1% of normal people have an infrared emission detection temperature higher than these values, these may represent appropriate cutoffs for fever screening using this device.

Adolescent↗

Hypouricemia, abnormal renal tubular urate transport, and plasma natriuretic factor(s) in patients with Alzheimer's disease.

OBJECTIVE: To study tubular urate transport in Alzheimer's disease (AD) and measure sodium and lithium transport rates in rats exposed to AD plasma. DESIGN: Cross-sectional study in three comparison groups. SETTING: Referral private institution involving outpatient and hospitalized patients. PATIENTS: AD, multi-infarct dementia (MID) and non-demented controls (C) were selected and evaluated by a geriatrician and a psychiatrist according to availability and willingness to participate in the study. Demented patients had brain imaging, categorized according to NINCDS-DSM III criteria, and had Mini-mental status examination (MMSE) scores determined. INTERVENTIONS: Injection of 0.5 mL of plasma I.P. followed 120 minutes later by an IV plasma injection of 0.2 mL priming dose and infusion of 1.8 mL of plasma at 0.01 mL/min in Sprague Dawley rats. MEASUREMENTS: Renal clearance studies were performed in subjects and in rats exposed to the plasma of study subjects. We measured serum urate concentration and fractional excretion (FE) of urate in subjects and FE sodium and FE lithium in rats. RESULTS: Serum urate was lower and FE urate higher in 18 AD patients compared with six patients with MID, P < 0.05 and P < 0.005, and 11 C, P < 0.02 and P < 0.005, respectively. Higher FE sodium and FE lithium were noted in rats given plasma from 19 AD patients compared with 12 with MID, P < 0.005 and P < 0.0025, and 14 C, P < 0.0025 and P < 0.0005, respectively. FE sodium and FE lithium decreased progressively after serial dilutions of three AD plasmas and FE lithium was negatively correlated with MMSE scores only in AD, r = -0.71 and P < 0.0005. CONCLUSIONS: In AD there is defective tubular urate transport and a plasma natriuretic factor(s). FE sodium and/or FE lithium in rats exposed to plasma of demented patients may differentiate AD from MID and estimate the severity of AD.

Aged↗

Elevated circulating tumor necrosis factor levels in Alzheimer's disease.

Recent investigations have demonstrated a local inflammatory response in Alzheimer's disease (AD), including microglia and cytokines. Levels of the cytokine tumor necrosis factor alpha (TNF-alpha) in sera from patients with AD and age-matched controls were measured by an enzyme-linked immunoassay and a cytotoxicity bioassay. Significantly elevated levels of TNF were found in AD sera compared to controls. Elevated circulating TNF may be derived from the local CNS inflammatory reaction in AD, and may account for some systemic manifestations of AD such as weight loss. Future studies may determine if, in the absence of complicating disorders which may elevate TNF, circulating TNF could be a marker of AD inflammatory activity.

Aged↗

Screening examinations in the elderly: which are worthwhile?

The elderly are requiring more medical services than ever before, expecting high-quality medical care and routine checkups. Few guidelines exist on appropriate screening of healthy adults. The health care screening of elderly patients must be geared to common geriatric diseases that may present with atypical symptoms.

Activities of Daily Living↗

Predictors of hospital length of stay and nursing home placement in an elderly medical population.

OBJECTIVE: To identify predictors of adverse outcomes (nursing home placement and hospital length of stay) in a cohort of older hospitalized patients. DESIGN: Prospective cohort study. SETTING: A suburban medical center in the New York City metropolitan area. PARTICIPANTS: Patients aged 65 years and older admitted from the emergency department to medical services who could be seen within 24 hours. Patients with terminal illness, planned stays < 2 days, and admission to other than medicine were excluded. MEASUREMENTS: Sociodemographic data, mobility, Activities of Daily Living (ADL), Instrumental Activities of Daily Living (IADL), mental status, length of stay (LOS), discharge diagnosis, and disposition (nursing home vs. other). RESULTS: Of 681 patients screened, 322 were eligible and assessed at admission,206 were reassessed at discharge. Using multiple regression, greater dependency in IADL, more household help, and impaired mental status at admission predicted hospital LOS significantly (P = 0.0001). Compared with those discharged home, the nursing home (NH) group had lower scores on mean mobility and mean ADLs and IADLs and was more likely to exhibit a decline in at least one ADL. Stepwise discriminant analysis was performed using admission, discharge, and combined variables. In our final model of the predictors of discharge disposition, the use of admission functional variables, age, and sex correctly classified 100% of the NH group and 91% of the other group, with IADL, ADL, and mobility defining the function that discriminated the groups. CONCLUSIONS: Our data indicate the value of cognitive and physical function at admission as predictors of adverse outcomes and support early assessment of the elderly for discharge planning for long-term care.

Journal Article↗