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Biomedical subjects

D A Rosenthal

Publications and source records attributed to D A Rosenthal.

4 recordsLinked to original sources
PubMed1991

Condoms and coitus: adolescents attitudes to AIDS and safe sex behavior.

This study investigated the relationship between sexual risk taking and attitudes to AIDS precautions among a sample of approximately 1000 non-virgin adolescents attending 15 colleges and universities in Victoria, Australia. Four attitudinal dimensions were isolated: Antiprecautions, Risk Denial, Abrogation of Responsibility and Fatalism. These attitudes showed meaningful relationships with different types of sexual risk: risk with a casual partner, risk with a regular partner, and multiple partnering. Different patterns of association emerged for males and females, with female risk behavior being more strongly related to antiprecautions attitudes. These differences were discussed in the light of gender-stereotypic responses to sexual situations, and their implications for educational interventions were explored.

Acquired Immunodeficiency Syndrome↗
PubMed1979

Effect of elastic compression on venous hemodynamics in postphlebitic limbs.

To determine whether elastic compression alters the venous hemodynamics in the postphlebitic limb, we measured venous pressure patterns in 11 postphlebitic limbs with and without elastic compression stockings. Following cannulation of a dorsal vein of the foot, the patients underwent measurements of basal resting pressure, maximum percent decrease in venous pressure with exercise (delta VPex), peak systolic venous pressure during exercise (SVPmax), the amplitude of the pressure swing, and venous return time. Elastic compression did not alter basal resting pressure, delta VPex, or venous return time. By contrast, SVPmax decreased from 139 +/- 0.3 mm Hg to 11 +/- 8 mm Hg with elastic compression. If venous ulcers are related to the high pressure developed in the superficial veins during calf muscle systole, then elastic compression may be beneficial by decreasing systolic venous pressure and its subsequent deleterious consequences.

Bandages↗
PubMedDate not supplied

Mutual potentiation of the neuromuscular effects of antibiotics and relaxants.

The interaction of d-tubocurarine, pancuronium, or succinylcholine with neomycin, streptomycin, or polymyxin B was investigated using a rat phrenic nerve-hemidiaphragm preparation. All neuromuscular blocking agents (relaxants) mutually potentiated the neuromuscular blocking action of one another; combinations of ineffective concentrations of relaxants and antibiotics caused an 82 to 98% neuromuscular block. This extensive potentiation of the neuromuscular effects of relaxants by antibiotics can be attributed to the fact that antibiotics not only have a curare-like stabilizing effect on the postjunctional membrane, but also decrease presynaptic acetylcholine release. Neostigmine (0.25 microgram/ml) only partially antagonized the neuromuscular block caused by the various drug combinations. In contrast, 4 microgram/ml of 4-aminopyridine returned the twitch tension, depressed by combined administration of relaxants and antibiotics, to or above control values except in the case of neuromuscular block caused by the combinations of succinylcholine and polymyxin B.

Aminopyridines↗