The paper is concerned with the results of studies on the basal blood flow and responses of the microcirculatory channel to physiological and pharmacological loads in health and diabetes mellitus using the method of photon-correlation spectroscopy in the light fiber variant. The rate of the basal blood flow in patients with diabetes mellitus (irrespective of the diabetes type) as compared to that in health was significantly lower in the finger tip and tended toward reduction in the inner side of the forearm, lobule of the auricle and in the conjunctiva. The presence of retinopathies in patients with diabetes mellitus resulted in a significant decrease in the rate of the blood flow in the conjunctiva as compared to those in health and diabetes mellitus without retinopathy. The response of the blood flow to physiological (orthostatic and ischemic) and pharmacological (nitroglycerin and pentoxifyllin) tests in patients with diabetes mellitus was also low; the presence of angiopathies caused a more acute reduction of the reactive power of the microcirculatory channel to the orthostatic test. The nature of the nitroglycerin effect in health and diabetes mellitus was different: in the first case noticeable vascular reactions were observed, in the second case a persistent vasodilative effect was observed. The pentoxifyllin effect was characterized by an elevated rate of the blood flow in health and diabetes mellitus.
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