Abstract
In vascular smooth muscle (as in myocardial fibres) a transmembrane supply of Ca++ ions is required for active tension development: Whereas restriction of Ca++ delivery to the contractile system damps mechanical activity, hypercontractile disorders result from a disproportional augmentation of Ca++ entry into the intracellular space. Thus excessive intrusion of Ca++ into the cytoplasm has to be considered the decisive reason for phasic and tonic hyperactivity of the arterial and arteriolar vasculature, culminating in vasospasm. Conversely, Ca++ antagonists which lower transmembrane Ca++ uptake not only in myocardial fibres, but also in smooth muscle (see [6–13, 31]), possess a wide scope of action* against practically all types of vasoconstrictor responses of the coronary, pulmonal, cerebral, renal, or mesenteric arteries.
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Fleckenstein, A., Frey, M., Zorn, J., Fleckenstein-Grün, G. (1985). Interdependence of Antihypertensive, Anticalcinotic, and Antiarteriosclerotic Effects of Calcium Antagonists — Model Experiments on Spontaneously Hypertensive Rats (SHR). In: Fleckenstein, A., Van Breemen, C., Gross, R., Hoffmeister, F. (eds) Cardiovascular Effects of Dihydropyridine-Type Calcium Antagonists and Agonists. Bayer-Symposium, vol 9. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70499-4_32
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DOI: https://doi.org/10.1007/978-3-642-70499-4_32
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