- Preservation of myocardial blood flow by calcium antagonists does not prevent attenuation of regional myocardial function after repetitive brief periods of myocardial ischaemia in the rat heart. Tiefenbacher, C.P., Zimmermann, R., Parekh, N., Amann, K., Tillmanns, H., Rauch, B., Kübler, W. Eur. Heart J. (1995)