Hemodynamic effects of edrophonium chloride (Tensilon) infusion

The hemodynamic effects of a 10 mg bolus of edrophonium chloride followed by a continuous infusion of 0.25 to 1.0 mg per minute, were determined in unanesthetized patients with significant myocardial disease. The effect on heart rate of the drug was negated by studying a group of nine patients with complete heart block and permanently implanted ventricular pacemakers. After the 10 mg bolus, two of the nine patients experienced dizziness, nausea and abdominal cramps associated with a mild decrease in peripheral vascular resistance. There was no significant change in cardiac index, mean blood pressure, brachial artery upstroke time, corrected ejection time, or left ventricular systolic ejection time. This study demonstrated that the continuous infusion of 0.25 to 1.0 mg per minute of edrophonium chloride following a 10 mg loading dose, had no significant effect on myocardial function.

Cosmogenic and Primordial Radionuclides in Lunar Samples by Nondestructive Gamma-Ray Spectrometry

The (7)Be, (22)Na, (26)Al, (44)Ti, (46)SC, (48)V (51)Cr, (54)Mn, (56)Co, (57)Co, (57)CO, (40)K, (238)U, and (232)Th were measured in lunar fines and portions of three rocks. Major production of cosmogenic radionuclides is due to solar protons, thus their concentrations are far different than those in meteorites. Surface exposures of the rocks and fines are long compared with the 0.74 million year half-life of (26)Al. Lunar fines show substantially higher concentrations of low energy reaction products. The ratios of thorium to uranium are extremely constant at 3.8, which indicates very little geochemical differentiation and are in good agreement with a common nucleosynthesis for lunar and earth materials.

Radionuclide Composition of the Allende Meteorite from Nondestructive Gamma-Ray Spectrometric Analysis

The concentrations of beryllium-7, sodium-22, aluminum-26, potassium-40, scandium-46, vanadium-48, chromium-51, manganese-54, cobalt-57, cobalt-60, and thorium-232 (thallium-208) have been measured in the Allende meteorite by nondestructive gamma-ray spectrometry. The high cobalt-60 content of the meteorite is indicative of a preatmospheric body with a minimum effective radius of 50 centimeters and a weight of 1650 kilograms; the aluminum-26 activity indicates a minimum exposure age of 3 million years.