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Biomedical subjects

J ROBERTS

Publications and source records attributed to J ROBERTS.

At least 19 recordsLinked to original sources
PubMed1965

COGAN'S SYNDROME.

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Apraxias↗
PubMed1962

Effect of reserpine pretreatment on the response of isolated papillary muscle to ephedrine.

Reserpine pretreatment of cats abolished the action of ephedrine to induce spontaneous beating in papillary muscles obtained from these animals. This spontaneous beating was viewed as resulting solely from catechol amine release. The positive inotropic action of ephedrine was diminished but not abolished by reserpine pretreatment. Reserpine reduced the heart rate in vivo, but it did not affect the peak contraction height or the rate of failure of the isolated papillary muscle. The contractile response to adrenaline (0.1 mug/ml.) was not affected by reserpine pretreatment. However, in this concentration adrenaline induced spontaneous beating only after reserpine.

Animals↗
PubMed1960

Effect of reserpine on ventricular escape.

Catecholamine depletion by reserpine diminishes the tendency of the ventricle to escape from vagal suppression. Neither spinal section nor adrenalectomy enhances the reserpine effect. Norepinephrine restores the characteristic occurrence of ventricle escape during vagal stimulation.

Catecholamines↗