scholarly journals Retinal Microvascular Reactivity in Chronic Cigarette Smokers and Non-smokers: An Observational Cross-Sectional Study

2021 ◽  
Vol 8 ◽  
Author(s):  
Huan Xu ◽  
Yuan Zong ◽  
Jian Yu ◽  
Chunhui Jiang ◽  
Haohao Zhu ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Valsalva Maneuver ◽  
Systemic Blood Pressure ◽  
Percentage Change ◽  
Foveal Avascular Zone ◽  
Systemic Blood ◽  
Cross Sectional ◽  
Cigarette Smokers ◽  
Retinal Microvasculature ◽  
Significant Difference

Purpose: To evaluate the changes in the retinal microvasculature and its reactivity in chronic cigarette smokers.Methods: Thirty-four male chronic cigarette smokers and 18 male non-smokers were enrolled. Optical coherence tomography angiography was used to measure the perfused retinal vessel densities (PVDs) of the peripapillary and parafoveal areas at baseline and during phase IV of the Valsalva maneuver (VM-IV). Systemic blood pressure and intraocular pressure were also measured.Results: The baseline PVD in the peripapillary area of the smokers was significantly lower than the non-smokers (59.56 ± 2.26% vs. 61.67 ± 3.58%, respectively; P = 0.005). However, there was no significant difference in the foveal avascular zone or parafoveal PVD between the two groups. During VM-IV, the peripapillary PVD of the smokers decreased by 1.13 ± 3.50%, which was significantly less than that of the non-smokers (−3.83 ± 4.26%, P < 0.05). Similarly, the parafoveal PVD of the smokers decreased by 5.49 ± 9.70%, which was significantly less than the percentage change of the non-smokers (−13.01 ± 8.39%, P < 0.05). There was no significant difference in the percentage change in systemic blood pressure parameters between the two groups.Conclusion: The retinal microvasculature and its reactivity were impaired in chronic smokers compared with non-smokers. The extent of impairment differed among different regions of the fundus.

scholarly journals Changes in the Retinal Microvasculature Measured Using Optical Coherence Tomography Angiography According to Age

2020 ◽  
Vol 9 (3) ◽  
pp. 883 ◽  
Author(s):  
Seung Hun Park ◽  
Heeyoon Cho ◽  
Sun Jin Hwang ◽  
Beomseo Jeon ◽  
Mincheol Seong ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Foveal Avascular Zone ◽  
Vascular Density ◽  
Inner Plexiform Layer ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Swept Source ◽  
Age Related ◽  
Retinal Microvasculature ◽  
Significant Difference

In this cross-sectional study, we examined age-related changes in the retinal vessels of 100 healthy participants, aged from 5 to 80 years, and divided into four groups (G1, under 20 years of age; G2, from 20 to 39 years of age; G3, from 40 to 59 years of age; G4, age 60 years or older). All subjects underwent swept-source optical coherence tomography (SS-OCT) and OCT angiography (OCTA). The vascular density (VD) of the superficial (SCP) and deep capillary plexus (DCP), and choriocapillaris (CCP) were measured using OCTA. The vascular density of each capillary layer, foveal avascular zone (FAZ) area, ganglion cell-inner plexiform layer (GC-IPL) thickness, retinal thickness (RT), and choroidal thickness (CT) were compared between age groups. Most OCT variables were correlated with OCTA variables. The FAZ area; VD of the SCP, DCP, and CCP; GC-IPL thickness; RT; and CT showed significant difference (p < 0.001) between G1 + G2 and G3 + G4, except for central GC-IPL thickness (p = 0.14) and central RT (p = 0.25). Density of the retinal capillary vasculature reduced and FAZ area increased after age 40, which represents the onset of middle age.

scholarly journals Association of serum uric acid with systemic blood pressure – A Cross Sectional study.

2021 ◽  
Vol 29 (01) ◽  
pp. 88-93
Author(s):  
Shumail Saeed Siddiqui ◽  
Shagufta Memon ◽  
Shumaila Shaikh ◽  
Umair Ali Soomro ◽  
Sadia Tabassum ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Uric Acid ◽  
Serum Uric Acid ◽  
Positive Association ◽  
Systemic Blood Pressure ◽  
Cross Sectional Study ◽  
Systemic Hypertension ◽  
Sectional Study ◽  
Systemic Blood ◽  
Cross Sectional

Objective: To determine association of Serum Uric Acid levels (SUA) in subjects suffering Systemic Blood Pressure and to determine its association with systolic and diastolic blood pressure. Study Design: Cross Sectional Study. Setting: Department of Faculty of Medicine and Allied Medical Sciences, Isra University, Hyderabad, Sindh, Pakistan. Period: January 2018 to September 2019. Material & Methods: 150 diagnosed cases of systemic hypertension and 150 controls were selected though non-probability purposive sampling according to inclusion and exclusion criteria. 2 ml venous blood was taken, centrifuged and sera were used for uric acid. Data was saved in a pre- structured Performa. Statistical software (SPSS v 21.0, IBM, Incorporation, USA) of data variables was analyzed at 95% CI (P ≤ 0.05). Results: Serum uric acid in controls was 2.93±0.72 compared to cases 4.25±1.44 mg/dl (P=0.0001). Hyperuricemia was observed in 58 (38.6%) cases compared to 23 (15.3%) controls. Uric acid shows strong positive association with Systolic BP (r= 0.52*, p=0.0001) and Diastolic BP (r= 0.46**, p=0.0001). Conclusion: We found hyperuricemia in 58 (38.6%) of systemic hypertension cases. Systolic and Diastolic Blood pressure show positive association with uric acid.  

Methylprednisolone on circulating eicosanoids and vasomotor tone after endotoxin

1986 ◽  
Vol 61 (1) ◽  
pp. 185-191 ◽  
Author(s):  
C. A. Hales ◽  
R. D. Brandstetter ◽  
C. F. Neely ◽  
M. B. Peterson ◽  
D. Kong ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Vascular Resistance ◽  
Systemic Blood Pressure ◽  
Physiological Effect ◽  
High Dose ◽  
Systemic Blood ◽  
Eicosanoid Production ◽  
Circulating Levels

Acute pulmonary and systemic vasomotor changes induced by endotoxin in dogs have been related, at least in part, to the production of eicosanoids such as the vasoconstrictor thromboxane and the vasodilator prostacyclin. Steroids in high doses, in vitro, inhibit activation of phospholipase A2 and prevent fatty acid release from cell membranes to enter the arachidonic acid cascade. We, therefore, administered methylprednisolone (40 mg/kg) to dogs to see if eicosanoid production and the ensuing vasomotor changes could be prevented after administration of 150 micrograms/kg of endotoxin. The stable metabolites of thromboxane B2 (TxB2) and 6-ketoprostaglandin F1 alpha (6-keto-PGF1 alpha) were measured by radioimmunoassay. Methylprednisolone by itself did not alter circulating eicosanoids but when given 2.5 h before endotoxin not only failed to inhibit endotoxin-induced eicosanoid production but actually resulted in higher circulating levels of 6-keto-PGF1 alpha (P less than 0.05) compared with animals receiving endotoxin alone. Indomethacin prevented the steroid-enhanced concentrations of 6-keto-PGF1 alpha after endotoxin and prevented the greater fall (P less than 0.05) in systemic blood pressure and systemic vascular resistance with steroid plus endotoxin than occurred with endotoxin alone. Administration of methylprednisolone immediately before endotoxin resulted in enhanced levels (P less than 0.05) of both TxB2 and 6-keto-PGF1 alpha but with a fall in systemic blood pressure and vascular resistance similar to the animals pretreated by 2.5 h. In contrast to the early steroid group in which all of the hypotensive effect was due to eicosanoids, in the latter group steroids had an additional nonspecific effect. Thus, in vivo, high-dose steroids did not prevent endotoxin-induced increases in eicosanoids but actually increased circulating levels of TxB2 and 6-keto-PGF1 alpha with a physiological effect favoring vasodilation.

scholarly journals Pressure constrained mitral annular dysfunction determines severity of regurgitation in Barlow's disease – a 3D echocardiographic study

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
K.A Dumont ◽  
R Persson ◽  
J.P Kvitting ◽  
R Lundblad ◽  
R Haaverstad ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Aortic Valve ◽  
Mitral Regurgitation ◽  
Surface Area ◽  
Systemic Blood Pressure ◽  
Funding Source ◽  
Healthy Controls ◽  
Systemic Blood ◽  
Barlow’S Disease ◽  
3D Echo

Abstract Background Barlow's disease provides both diagnostic and therapeutic challenges. The impact of systemic blood-pressure on severity of regurgitation is still unclear. Purpose We hypothesized that mitral annulus behaves passively with enlargement during ventricular systole, and secondly, we tested the hypothesis that severity of regurgitation correlates to systemic blood-pressure (BP) of the patient. Methods Ten patients with Barlow's disease were compared with 10 healthy controls. Brachial blood-pressure was measured according to guidelines. Transthoracic 3D echo was obtained from an apical view (38.6±8.2 frames per second). Data was analyzed using a holographic display. We measured commissure width (CW), septallateral length (SL) and mitral annular surface area throughout the cardiac cycle. Aortic flow ejection time was derived from continuous Doppler across the aortic valve. Timing of aortic valve closure was visually assessed by 3D echo. Onset and end of mitral regurgitation was derived from continuous wave Doppler of transmitral flow. Results Systolic BP in controls and patients were 122±5 and 133±12 mmHg, respectively (p&lt;0.05). Enddiastolic volume was 87±7 ml/m2 (controls) and 100±14 ml/m2 (Barlow), p&lt;0.02. Left ventricular EF in controls and patients were 59±5 and 62±5%, respectively, p=NS. Barlow patients had moderate or severe late systolic regurgitation with mean regurgitation volume of 51±18 ml. Annular surface area, CW and SL behaved passively with enlargement during ventricular systole (Figure 1). Peak systolic surface area, CW and SL in healthy controls and Barlow patients were 8.7±0.5 vs 20.7±3.2 cm2 (p&lt;0.001), 30.1±1.5 vs 49.5±4.9 mm (p&lt;0.001) and 30.9±1.5 vs 44.9±3.3 mm (p&lt;0.001). Peak annular surface area and regurgitation volume in patients showed a positive correlation with systolic BP (y = 0.156x − 0.077, r=0.60 and y = 1.136x − 99.7, r=0.80, respectively). Conclusions We have demonstrated pressure constrained mitral annular dysfunction in Barlow's disease, indicating that systemic blood pressure may modify the severity of regurgitation. The study provides novel insights into mechanisms of mitral regurgitation and potential therapeutic actions in the future. Figure 1 Funding Acknowledgement Type of funding source: Foundation. Main funding source(s): Grieg Foundation

PS 02-65 ASSOCIATION BETWEEN POSTPRANDIAL AND SLEEPING SYSTEMIC BLOOD PRESSURE CHANGES IN THE NON-DIABETIC ELDERLY

2016 ◽  
Vol 34 (Supplement 1) ◽  
pp. e121
Author(s):  
Fernando Garcia ◽  
Beatriz Fidale ◽  
Sebastião Ferreira-Filho
Keyword(s):  
Blood Pressure ◽  
Systemic Blood Pressure ◽  
Systemic Blood ◽  
Pressure Changes

Relation of Systemic Blood Pressure to Sudden Cardiac Death

2012 ◽  
Vol 110 (3) ◽  
pp. 378-382 ◽  
Author(s):  
Jari Antero Laukkanen ◽  
J. Richard Jennings ◽  
Jussi Kauhanen ◽  
Timo Heikki Mäkikallio ◽  
Kimmo Ronkainen ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Sudden Cardiac Death ◽  
Cardiac Death ◽  
Systemic Blood Pressure ◽  
Systemic Blood

The histopathology of experimental spinal cord trauma

1978 ◽  
Vol 48 (6) ◽  
pp. 1002-1007 ◽  
Author(s):  
Stephen E. Rawe ◽  
William A. Lee ◽  
Phanor L. Perot
Keyword(s):  
Blood Pressure ◽  
Spinal Cord ◽  
Systemic Blood Pressure ◽  
Post Injury ◽  
Systemic Blood ◽  
Edema Formation ◽  
Thoracic Spinal Cord ◽  
Content Type ◽  
Thoracic Spinal ◽  
Marked Enhancement

✓ The early sequential histopathological alterations following a concussive paraplegic injury to the posterior thoracic spinal cord in cats were studied. The lack of significant progression of hemorrhages over a 4-hour period after injury indicates that most hemorrhages probably occur within the first hour. The marked enhancement or retardation of hemorrhages in the post-injury period, when the blood pressure was increased or decreased, respectively, demonstrates the loss of autoregulation of spinal cord vasculature at the trauma site after a concussive paraplegic injury. Progressive edema formation was evident over a 4-hour period following injury, and it could be enhanced or retarded by elevation or reduction of the systemic blood pressure.

scholarly journals Evaluation of Changes of Systemic Blood Pressure and Shunt Incidence in CEA

2007 ◽  
Vol 34 (5) ◽  
pp. 540-545 ◽  
Author(s):  
M. Aleksic ◽  
J. Heckenkamp ◽  
M. Gawenda ◽  
V. Reichert ◽  
J. Brunkwall
Keyword(s):  
Blood Pressure ◽  
Systemic Blood Pressure ◽  
Systemic Blood
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