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R Ice

Publications and source records attributed to R Ice.

6 recordsLinked to original sources
PubMed1997

Biokinetic model for 137Cs in the fetus.

The metabolic data for cesium and the biologically similar element potassium in the pregnant woman were reviewed. Due to the rapid growth of the placenta and fetus, the pregnancy was divided into four gestational periods: five through ten weeks, eleven through twenty weeks, twenty-one through thirty weeks, and thirty-one through forty weeks. A physiologically based biokinetic model for potassium was developed for each of these periods. This model was used as a basis for the cesium model. The models consisted of several organs, all of which involved recycling and for which it was assumed that equilibrium existed between the uterus and maternal plasma and the fetal organs and fetal plasma. The absorbed dose to the fetus and placenta was estimated from 137Cs located in the fetus and placenta using medical internal radiation dosimetry methodology. The dose to the embryo/ fetus was 1.3 x 10(-5) Gy Bq(-1) during the first gestational period and decreased to 8.3 x 10(-6) Gy Bq(-1) for the final period. The dose to the placenta also decreased as the pregnancy progressed. 137Cs located in the maternal organs was not accounted for when determining the fetal dose estimates.

Cesium Radioisotopes↗
PubMed1985

Bromine-82 contamination in fission product 99mTc-generator eluate.

Following receipt of fission product 99mTc-generators, results of radionuclide purity analysis, performed within 30 min after the first elution, demonstrated detectable levels of a contaminate radionuclide not previously reported. Gamma spectroscopy and half-life determinations confirmed the presence of 82Br. Bromine-82 activity, in eluates from the first elution of 30 generators, received weekly during a 7-month period, ranged from 0.22 microCi (8.235 kBq) to 0.67 microCi (24.68 kBq) per eluate. The ratio of 99Mo to 99mTc ranged from 0.13 nCi to 0.39 nCi per mCi 99mTc. The presence of 82Br in 99mTc-generator eluate resulted in falsely elevated 99Mo assay determinations using whole vial 99Mo assay procedures. For every 0.1 microCi 82Br present in 99mTc eluate the 99Mo assay results were elevated by 1 microCi. Gamma spectroscopy of eluates from additional elutions of these generators failed to detect the presence of 82Br demonstrating the displacement of monovalent bromine anions from the alumina column during the first elution.

Bromine↗
PubMed1985

Long-term compliance.

This article defines and reviews long-term compliance to health-promoting behaviors in healthy subjects and patients with coronary heart disease. Studies demonstrating problems with patient memory for medical advice reveal the magnitude of barriers therapists encounter in a primary or secondary prevention program. Compliance with weight reduction and exercise conditioning programs in healthy subjects is low because of a variety of behavioral, socioeconomic, and programmatic problems. Long-term exercise training compliance in cardiac rehabilitation programs, despite the presence of a life-threatening disease process, is also low. I present strategies to improve compliance and the rationale for combining these strategies with modification of major risk factors. Physical therapists must be innovative, creative, and experimental in program design when they attempt to improve patients' adherence rate.

Adult↗
PubMed1981

Effect of cardiac drugs on imaging studies with thallous chloride Tl 201.

The effects of commonly used cardiac drugs on cardiac imaging with thallium-201-labeled thallous chloride were studied. This retrospective study included 62 men ranging in age from 37 to 70 years who had cardiac imaging attempted with thallium during an eight-month period. Seven drugs were being used by at least eight patients each--propranolol, nitroglycerin ointment, isosorbide dinitrate, digoxin, hydrochlorothiazide, potassium chloride, and quinidine. Myocardial-to-background (M/Bk) ratios were calculated for each patient. No drug consistently affected the M/Bk ratios. The lowest M/Bk ratio was found in patients receiving digoxin, but there was no significant difference between the M/Bk ratios for patients taking digoxin (1.38 +/- 0.16) and those not taking digoxin (1.45 +/- 0.10) (0.05 less than p less than 0.10, Student's t test). It is concluded that the drugs studied do not affect cardiac imaging with thallous chloride Tl 201.

Adult↗
PubMed1979

Long-term effects of physical training on coronary patients with impaired ventricular function.

Eighteen patients with coronary heart disease and an ejection fraction of 0.40 or less were entered into an individualized exercise training program. Maximal symptom-limited exercise stress test and cardiac catheterization studies were performed initially and 12--42 months (average 18.5 months) after exercise training. At the time of the follow-up study, the mean functional aerobic impairment (FAI) improved from 32.1 to 23.4% (p less than or equal to 0.01); resting and submaximal heart rates were significantly lower (p less than 0.01 and 0.05, respectively). There was no significant change in the pulmonary artery or left ventricular end-diastolic pressure, cardiac index, stroke index, left ventricular end-diastolic volume or ejection fraction. Exercise training, therefore, can be beneficial even for patients with impaired ventricular function. Increase in physical work capacity was not correlated with improvement of ventricular function; on the other hand, exercise training did not cause deterioration of ventricular function.

Adult↗