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Query: UMLS:C0022116 (ischemia)
 91,303 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Plugging of skin capillaries by activated white blood cells is one of the proposed mechanisms by which skin damage may be initiated in chronic venous insufficiency. The aim of this study was to determine whether a microcirculatory deficit was induced in the skin by raising the venous pressure proximally for thirty minutes. Seventeen subjects with no evidence of venous or arterial disease had laser Doppler velocimetry performed in the goiter region of the leg; 8 different subjects had the measurement done on the dorsum of the hand. Peak hyperemic response following three minutes of ischemia was measured before and after a thirty-minute period of sustained venous hypertension applied by a proximal tourniquet inflated to 80 mm Hg. A decrease in the peak flow: baseline flow ratio (median ratio 2.25 before, 1.70 after, p less than 0.02) and an increase in the time taken to reach maximal hyperemia (median time ten seconds before, twenty seconds after, p less than 0.01) were observed after the period of venous hypertension in the lower limb. The second parameter, but not the first, was significantly affected in the upper limb. The authors conclude that a microvascular deficit in the skin is demonstrable after a short period of venous hypertension. This is consistent with the white-cell-trapping theory, but other possible explanations are discussed.
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PMID:The effect on skin blood flow of short-term venous hypertension in normal subjects. 182 74

The results are presented of the studies of oxygen metabolism in the muscular tissue of patients with the thyroid goiter formation. An original method of the polarographic study allows one to observe the process of oxygen transport not only from the intracellular space into the cell, but also from the blood channel into the intracellular space. Oxygen utilization curve was recorded after prolonged ischemia (15 minutes) the oxygen recovery curve was noted, according to which the oxygen recovery rate coefficient, allowing to judge the circulation time and the vascular wall permeability, was counted by analogy with oxygen utilization rate determination. The ratio of these coefficients was used as an index for the tissue supplying with oxygen. The data are presented of studying 105 patients with different forms of the thyroid goiter formation. The informativeness of the utilization rate coefficient is examined for evaluating oxygen consumption by tissues. This index was practically equal in patients with diffuse toxic goiter, nodose euthyroid goiter and in the controls. At the same time the coefficient of oxygen recovery rate and the coefficient ratio of oxygen recovery and utilization rates were significantly elevated in patients with diffuse toxic goiter (1.3 +/- 0.21, 4.33 +/- 0.76) in comparison with the patients suffering from nodose euthyroid goiter (0.72 +/- 0.2, 2,95 +/- 0.66) and the controls (0.67 +/- 0.18, 1.8 +/- 0.37). In the patients with diffuse toxic goiter these indices returned to normal (0.44 +/- 0.11, 1.57 +/- 0.63) following the preoperative preparation.
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PMID:[Oxygen metabolism (based on polarographic data) in patients with thyroid diseases]. 654 91

Impaired microcirculation with evolving sludge phenomenon and thrombosis underlie placental changes in maternal thyroid disease. Capillary blood circulatory defect is largely due to villous immaturity. Placental tissue ischemia gives rise to fibrinoid, sclerosis, and alternative processes. Dysadaptive changes are mostly observed in thyrotoxicosis and hypothyroidism. Adaptive processes evolving at the ultrastructural level are best pronounced in euthyroid goiter.
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PMID:[Impact of maternal thyroid disease on the formation of relationships in the maternal-placental-fetal system]. 1698 91

We describe a rare case of retrosternal goiter that developed on the left side of the trachea, squeezing between the trachea and the left supra-aortic vessels, and causing signs of compression and acute left upper limb ischemia in a 35-year-old woman. Her symptoms disappeared after an emergency total thyroidectomy was performed.
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PMID:Left laterotracheal retrosternal goiter with left upper limb ischemia. 2114 10

Traditional forms of treatment of the thyroid diseases: pharmacotherapy, radioiodine therapy and surgery can not always be applied. Intolerance, side effects of antithyroid drugs, low iodine uptake, high risk of surgery or disagreement with the proposed treatment was the reason for seeking alternative healing methods. With the development of interventional radiology, and gained experience in the use of arterial embolization, this method has become possible to use in treatment of thyroid diseases. The essence of this treatment is to shut down blood flow in major arteries of the thyroid by direct injection into the vessel's light of adequate size particles containing polyvinyl alcohol (PVA). The consequence of acute ischemia is septic necrosis of the glandular tissue in a field being supplied by this artery. Further repair processes and fibrosis lead to a reduction of active thyroid hormone synthesis and restriction of thyroid gland. Effects of embolization on angiogenesis, apoptosis and autoimmune reactions contribute to compensation thyroid function and significant reduction a goiter volume in course of Graves' disease. Preoperative selective embolization of a huge goiter or thyroid cancer improves surgery outcomes, reduces the risk of hemorrhage and damage to surrounding tissue. Palliative use of embolization in advanced stages of thyroid cancer reduces symptoms and improves quality of life. Little invasive nature of this procedure, the lack of serious undesirable coincidence makes embolization of thyroid arteries an attractive form of a therapy, which may become a therapeutic option in many difficult clinical situations and improve the clinical effectiveness of treatment of thyroid disease.
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PMID:[Arterial thyroid embolization in thyroid diseases]. 2229 30