Relationship between Blood Flow Velocities in Retrobulbar Vessels and Laser Doppler Flowmetry at the Optic Disk in Glaucoma Patients

1999 ◽  
Vol 213 (3) ◽  
pp. 145-149 ◽  
Author(s):  
Zuzana Bohdanecka ◽  
Selim Orgül ◽  
AnjaB. Meyer ◽  
Christian Prünte ◽  
Josef Flammer
Keyword(s):  
Blood Flow ◽  
Laser Doppler Flowmetry ◽  
Laser Doppler ◽  
Optic Disk ◽  
Doppler Flowmetry ◽  
Blood Flow Velocities ◽  
Retrobulbar Vessels ◽  
Flow Velocities

Peculiarities of microcirculation in periodont tissues in children of key age groups sufficient type 1 diabetes. Part II

2019 ◽  
Vol 24 (2) ◽  
pp. 108-119 ◽  
Author(s):  
B. N. Davydov ◽  
D. A. Domenyuk ◽  
S. V. Dmitrienko
Keyword(s):  
Diabetes Mellitus ◽  
Blood Flow ◽  
Type 1 Diabetes ◽  
Type 1 Diabetes Mellitus ◽  
Laser Doppler Flowmetry ◽  
Laser Doppler ◽  
Diabetic Microangiopathy ◽  
Healthy Children ◽  
Doppler Flowmetry

Relevance. Morpho-functional changes in peripheral circulation established in type 1 diabetes mellitus correlate with changes in central hemodynamics, allowing the use of microcirculation indicators as diagnostic and prognostic criteria for assessing the degree of functional vascular disorders. Identifcation of microcirculation features of the blood by the method of laser Doppler flowmetry in children with different experience of type 1 diabetes in key age categories.Materials and methods. The study included 67 children with type 1 diabetes mellitus aged 12-15 years with an experience of the disease from six months to ten years. The comparison group consisted of 38 healthy children. The state of the microvasculature was assessed by laser Doppler flowmetry using a laser analyzer for capillary blood flow LAKK-OP.Results. In children with an experience of type 1 diabetes of less than two years, microcirculation disorders in periodontal tissues correspond to the hyperemic form, accompanied by increased perfusion, a decrease in the amplitude of low-frequency oscillations, increased heart rate, high blood flling, and blood flow bypass. For children with an endocrinopathy experience of more than three years, microcirculation disorders correspond to a stagnant form, combined with a decrease in perfusion due to stagnation of blood in the venular link, endothelial domination with suppression of neurogenic and cardiac fluctuations, low efciency and redistribution of blood flow in favor of the nutritive link.Conclusions. With the increase in experience, the degree of compensation of type 1 diabetes, the progression of diabetic microangiopathy, it is advisable to designate two stages of development of microcirculatory disorders. Early – compensatory with active adaptation, including neurogenic and endothelial regulation mechanisms. Late – decompensation with passive adaptation, supporting the effectiveness of microcirculation due to myogenic control of regulation, shunting and increasing the rate of blood outflow.

Effects of angiotensin on renal cortical and papillary blood flows measured by laser-Doppler flowmetry

1991 ◽  
Vol 261 (6) ◽  
pp. F998-F1006 ◽  
Author(s):  
M. S. Nobes ◽  
P. J. Harris ◽  
H. Yamada ◽  
F. A. Mendelsohn
Keyword(s):  
Blood Flow ◽  
Laser Doppler Flowmetry ◽  
Renal Perfusion ◽  
Laser Doppler ◽  
Ang Ii ◽  
Doppler Flowmetry ◽  
Blood Flows ◽  
Prostaglandin Synthase ◽  
Renal Cortical Blood Flow ◽  
Synthase Inhibitor

The effects of angiotensin II (ANG II) or angiotensin III (ANG III) on renal cortical blood flow (CBF) or papillary blood flow (PBF) were investigated in Inactin-anesthetized young rats with the use of laser-Doppler flowmetry. Infusion of equimolar pressor doses of ANG II (300 ng.kg-1.min-1 iv) or ANG III (267 ng.kg-1.min-1) decreased CBF by 31 +/- 2.6% (P less than 0.001) and 20.3 +/- 3.2% (P less than 0.01), respectively but increased PBF by 19 +/- 6.1% (P less than 0.05) and 14.6 +/- 4.4% (P less than 0.05). The ANG II-induced increase in PBF was not prevented by aortic clamping to maintain constant renal perfusion pressure or pretreatment with the prostaglandin synthase inhibitor, indomethacin. The nonpeptide ANG II receptor antagonist, DuP 753 completely abolished the systemic and intrarenal effects of ANG II. After pretreatment with a kallikrein inhibitor, aprotinin, ANG II infusion increased mean arterial pressure but did not affect PBF, suggesting that kinins, but not prostaglandins, modulate the action of systemic ANG II on PBF. We conclude that circulating ANG II induces vasoconstriction in the cortex and also promotes the intrarenal production of kinins, which act to enhance papillary blood flow.

scholarly journals Evaluation of the marginal gingival health using laser doppler flowmetry

2006 ◽  
Vol 17 (3) ◽  
pp. 219-222 ◽  
Author(s):  
Hakan Develioglu ◽  
Bülent Kesim ◽  
Aykut Tuncel
Keyword(s):  
Blood Flow ◽  
Laser Doppler Flowmetry ◽  
Laser Doppler ◽  
Plaque Index ◽  
Tissue Blood Flow ◽  
Doppler Flowmetry ◽  
Gingival Health ◽  
Significant Difference ◽  
Clinical Indices ◽  
And Control

The purposes of this study were to compare the gingival blood flow (GBF) in test sites (teeth retaining fixed partial dentures) and control sites (contralateral natural teeth) and investigate whether there is any relationship between clinical indices and GBF values. Twelve healthy subjects (6 females and 6 males) aged 20 to 54 years were enrolled this study. The GBF was measured from the middle point of the marginal gingiva in the test and control sites using laser Doppler flowmetry (LDF). Additionally, plaque index, gingival index and probing depth measurements were recorded. Statistically significant difference (p<0.05) was found between the test and control sites for marginal GBF. In contrast, no significant difference (p>0.05) was found between test and control sites with respect to the clinical indices, except for plaque index. The findings of this study suggest that there is a significant relation between resin-bonded fixed partial dentures with margins located subgingivally and marginal GBF. Clinical indices are helpful to collect information about the clinical health status of gingival tissues, but GBF is a good tool to measure gingival tissue blood flow and assess periodontal health. In conclusion, laser Doppler flowmetry can be used together with clinical indices to evaluate the marginal gingival health.

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