scholarly journals Left anterior descending arterial stenosis

2021 ◽  
Author(s):  
Henry Knipe ◽  
Stefan Tigges
Keyword(s):  
Arterial Stenosis

Fine Structural Changes in the Microvasculature of the Mouse Pinna: Aging and Radiation Injury

1974 ◽  
Vol 32 ◽  
pp. 54-55
Author(s):  
S. Phyllis Steamer ◽  
Rosemarie L. Devine
Keyword(s):  
Structural Changes ◽  
Radiation Treatment ◽  
Arterial Stenosis ◽  
Ultrastructural Changes ◽  
Vascular Effects ◽  
Microvascular Changes ◽  
Surrounding Connective Tissue ◽  
Fission Neutrons ◽  
Total Body

The importance of radiation damage to the skin and its vasculature was recognized by the early radiologists. In more recent studies, vascular effects were shown to involve the endothelium as well as the surrounding connective tissue. Microvascular changes in the mouse pinna were studied in vivo and recorded photographically over a period of 12-18 months. Radiation treatment at 110 days of age was total body exposure to either 240 rad fission neutrons or 855 rad 60Co gamma rays. After in vivo observations in control and irradiated mice, animals were sacrificed for examination of changes in vascular fine structure. Vessels were selected from regions of specific interest that had been identified on photomicrographs. Prominent ultrastructural changes can be attributed to aging as well as to radiation treatment. Of principal concern were determinations of ultrastructural changes associated with venous dilatations, segmental arterial stenosis and tortuosities of both veins and arteries, effects that had been identified on the basis of light microscopic observations. Tortuosities and irregularly dilated vein segments were related to both aging and radiation changes but arterial stenosis was observed only in irradiated animals.

Human Platelets Exposed to Mechanical Stresses Express a Potent Lipoxygenase Product

1992 ◽  
Vol 68 (05) ◽  
pp. 589-594 ◽  
Author(s):  
Alon Margalit ◽  
Avinoam A Livne
Keyword(s):  
Regulatory Volume Decrease ◽  
Human Platelets ◽  
Mechanical Stresses ◽  
Arterial Stenosis ◽  
Platelet Suspension ◽  
Suspension Flows ◽  
Lipoxygenase Product ◽  
Pathological Conditions ◽  
K Permeability ◽  
Volume Decrease

SummaryHuman platelets exposed to hypotonicity undergo regulatory volume decrease (RVD), controlled by a potent, yet labile, lipoxygenase product (LP). LP is synthesized and excreted during RVD affecting selectively K+ permeability. LP is assayed by its capacity to reconstitute RVD when lipoxygenase is blocked. Centrifugation for preparing washed platelets (1,550 × g, 10 min) is sufficient to express LP activity, with declining potency in repeated centrifugations, indicating that it is not readily replenish-able. When platelet suspension flows in a vinyl tubing (1 mm i.d.), at physiological velocity, controlled at 90–254 cm/s, LP formation increases as a function of velocity but declines as result of increasing the tubing length. Stirring the platelets in an aggregometer cuvette for 30 s, yields no LP unless the stirring is intermittent. No associated platelet lysis or aggregation are observed following the mechanical stress applications. These results demonstrate that although mechanical stresses result in LP production, the mode of its application plays a major role. These results may indicate that LP is synthesized under pathological conditions and could be of relevance to platelets behavior related to arterial stenosis.

STUDY ON THE CHARACTERISTICS OF DOPPLER ULTRASOUND OF LOWER EXTREMITY ARTERIES IN PATIENTS WITH DIABETES MELLITUS TYPE 2

2011 ◽  
pp. 25-30
Author(s):  
Keyword(s):  
Diabetes Mellitus ◽  
Doppler Ultrasound ◽  
Lower Extremities ◽  
Arterial Stenosis ◽  
Invasive Technique ◽  
Atherosclerotic Plaques ◽  
Type 2 Dm ◽  
Arterial Lesions ◽  
Patients With Diabetes

Objectives: Vascular Doppler ultrasound is a non-invasive technique to rapidly detect lesions of the vessels in the lower extremities with high accuracy. The use of this technique for detecting early vascular damages in patients with diabetes mellitus (DM) type 2 could help preventing major vascular complications caused by this disease. Materials and Method: This descriptive, cross-sectional study included 31 patients with type 2 DM who were treated in Endocrinology - Neurology - Respiratory Department, Hue Central Hospital between March and August 2011. All patients were undergone clinical and biochemical examinations, and Doppler ultrasound for detection of arterial lesions in their lower extremities. Results: Most patients had high intima media thickness (IMT) (77.42%), and all of them suffered from hypertension concomitant, with the rate of atherosclerotic plaque accounted for 35.48%. No one experienced arterial stenosis >50% and arterial occlusions, but the peak systolic velocities were significantly higher in patients with atherosclerotic plaques than those without atherosclerotic plaques. Conclusion: Vascular Doppler ultrasound should be used as routine test for early detection of arterial lesions in patients with type 2 DM.

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