Measurement of Cerebral Blood flow by Ultrasonic Doppler Technique : Effects of Low Temperature, Induced Hypertension and Arrhythmia on Cerebral Circulation

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概要

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• The effects of low temperature, induced hypertension and arrhythmia on cerebral circulation were investigated by ultrasonic Doppler technique. Rsults were as follows. 1) Effect on low temperature on cerebral hemodynamics. The hemodynamic comparison of the blood flow patterns in internal carotid artery in the same subject were carried out at the different seasons (in March and September). There are no significant differences between the blood flow patterns in March (12℃) and in September (30℃) independent of the blood pressure change. The constancy of cerebral blood flow in low temperature may well be based on the homeostasis of extra or intracranial circulation. 2) Effect of induced hypertension on cerebral hemodynamics. The hemodynamic comparison of the blood flow patterns in internal carotid artery were carried out by the administration of vasopressor drug (adrenalin, noradrenalin). The cerebral blood flow are markedly increased by adrenalin administration. This should be mainly resulted from the increase of cardiac output. On the other hand, the cerebral blood flow by noradrenalin administration falls into two types. The one is charcterized by the decrease of blood flow accompaning with the increase of blood pressure. The other is characterized by the increase of blood flow. The latter are prone to occur in the aged. This should be mainly resulted from the reactivity of the cerebral vassels to noradrenalin. 3) Effect of arrhythmia on cerebral hemodynamics. The normal blood flow patterns are observed in either auricular fibrillation or prematue beat in general. i.e., effective systole. However, under the conspicuous arrhythmia such as severe auricular fibrillation or premature beat accompaning with the very short coupling, the cerebral blood flow were frequently decreased or completely ceased. i.e., ineffective systole. The pathogenesis of ADAMS-STOKES'S Syndrome are discussed based on the results.

• 社団法人日本循環器学会の論文

著者

• Miyazaki Manabu

  The Department Of Internal Medicine Of Kosaiin Hospital

• Miyazaki Manabu

  The Department Of Internal Medicine Kosaiin Hospital

• Miyazaki M.

  The Department of Internal Medicine of Kosaiin Hospital

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