scholarly journals Effect of the Calcimimetic, Cinacalcet, on Regional Vascular Resistance and Blood Ionized Calcium in Uremic and Normal Rats

2007 ◽  
Vol 21 (6) ◽  
Author(s):  
Ryan M Fryer ◽  
Jason A Segreti ◽  
Kristin A Koch ◽  
Masaki Nakane ◽  
J. Ruth Wu‐Wong ◽  
...  
Keyword(s):  
Vascular Resistance ◽  
Ionized Calcium ◽  
Regional Vascular Resistance

Reflex effects of thoracic aorta wall stretch on regional vascular resistance

1978 ◽  
Vol 56 (3) ◽  
pp. 390-394
Author(s):  
Peter M. Szeto ◽  
Franco Lioy
Keyword(s):  
Arterial Pressure ◽  
Thoracic Aorta ◽  
Vascular Resistance ◽  
Carotid Arteries ◽  
Peripheral Resistance ◽  
Adrenergic Blockade ◽  
Vascular Responses ◽  
Regional Vascular Resistance ◽  
Vascular Beds ◽  
Intact Limb

In anesthetized, vagotomized cats with both carotid arteries occluded, a stretch of the walls of the thoracic aorta, performed without obstructing aortic flow, induced a significant reflex increase in arterial pressure (35 ± 2−26 ± 1 mmHg; systolic–diastolic). This pressure increase was accompanied by significant increases in peripheral resistance in the superior mesenteric (+30%), renal (+23%), and external iliac (+23%) vascular beds. The increase in iliac resistance observed in the skinned leg was comparable with that observed in the contralateral intact limb. All these vascular responses were drastically reduced by the administration of phenoxybenzamine. After α-adrenergic blockade no signs of reflex vasodilatation could be detected during aortic stretch in any of the vascular beds examined.

PERIPHERAL CIRCULATORY RESPONSE TO FEEDING IN THE NEWBORN INFANT

PEDIATRICS ◽  
1971 ◽  
Vol 47 (2) ◽  
pp. 378-383
Author(s):  
Alice C. Yao ◽  
C. Göran Wallgren ◽  
Sachchida N. Sinha ◽  
John Lind
Keyword(s):  
Vascular Resistance ◽  
Venous Occlusion ◽  
Term Infants ◽  
Significant Drop ◽  
Circulatory Response ◽  
Control Value ◽  
Limb Perfusion ◽  
Normal Term ◽  
Regional Vascular Resistance ◽  
Umbilical Arterial Catheter

The peripheral circulatory response to feeding was studied in 39 normal term infants, age ranging from 24 hours to 9 days. Blood flow to calf of left leg was measured by the venous occlusion plethysmographic method before and half hourly after feeding for 3 to 3½ hours. Arterial pressure was monitored in nine infants via an umbilical arterial catheter simultaneously and regional vascular resistance to flow in the leg calculated. Changes in pulse rate, and skin and rectal temperatures were also monitored. A significant drop in the calf perfusion averaging 49% of the control value was observed at the 30 minutes postprandial recording. This was due to an increased regional vascular resistance and blood pressure remained unchanged during the time of study. As a rule, a superseding hyperperfusion of the limb overshooting the control value by 40 to 50% occurred 1½ to 3 hours after feeding. This was comparable to the hyperkinetic phase described in adult man and other species after meals. The early postprandial vasoconstriction in the leg seems unique to the newborn. It is suggested that having the early circulatory demand provoked by feeding is relatively bigger in the newborn than in the adult and is met partly at the expense of lower limb perfusion.

Mechanisms of pressor response produced by stimulation of nucleus ambiguus

1990 ◽  
Vol 259 (5) ◽  
pp. R955-R962
Author(s):  
B. H. Machado ◽  
M. J. Brody
Keyword(s):  
Arterial Pressure ◽  
Vascular Resistance ◽  
Pressor Response ◽  
Nucleus Ambiguus ◽  
Ventrolateral Medulla ◽  
Pressor Responses ◽  
Regional Vascular Resistance ◽  
Parasympathetic Control ◽  
Renal Vascular ◽  
Stimulation Of

We showed previously that activation of nucleus ambiguus (NA) induced bradycardia and increased arterial pressure. In this study, we compared responses produced by electrical and chemical (glutamate) stimulation of NA and adjacent rostral ventrolateral medulla (RVLM). Equivalent pressor responses were elicited from both areas. However: 1) The response from RVLM was elicited at a lower frequency. 2) Regional vascular resistance changes were different, i.e., electrical stimulation of NA increased vascular resistance in hindquarters much more than the renal and mesenteric beds. In contrast, electrical and chemical stimulation of RVLM produced a more prominent effect on the renal vascular bed. 3) Bradycardia was elicited from NA at lower current intensity. 4) Glutamate produced bradycardia only when injected into NA. Studies in rats with sinoaortic deafferentation showed that bradycardic response to activation of NA was only partly reflex in origin. We conclude that 1) NA and RVLM control sympathetic outflow to regional vascular beds differentially and 2) the NA region involves parasympathetic control of heart rate and sympathetic control of arterial pressure.

Effect of K ATP + channel inhibition on total and regional vascular resistance in guinea pig pregnancy

1998 ◽  
Vol 275 (2) ◽  
pp. H680-H688 ◽  
Author(s):  
Linda Keyes ◽  
David M. Rodman ◽  
Douglas Curran-Everett ◽  
Kenneth Morris ◽  
Lorna G. Moore
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cardiac Output ◽  
Guinea Pig ◽  
Vascular Resistance ◽  
Coronary Vascular Resistance ◽  
Ang Ii ◽  
Channel Activity ◽  
Vasoconstrictor Response ◽  
Regional Vascular Resistance

Decreased vascular resistance and vasoconstrictor response during pregnancy enables an increase in cardiac output and regional blood flow to the uterine circulation. We sought to determine whether inhibition of vascular smooth muscle ATP-sensitive potassium ([Formula: see text]) channel activity during pregnancy increased systemic and/or regional vascular resistance and resistance response to ANG II. A total of 32 catheterized, awake, pregnant or nonpregnant guinea pigs were treated with either the [Formula: see text]channel inhibitor glibenclamide (3.5 mg/kg) or vehicle (DMSO) ( n = 8/group). In nonpregnant and pregnant animals, glibenclamide raised blood pressure and systemic, uterine, and coronary vascular resistance, diminishing cardiac output and organ blood flow. Glibenclamide produced a greater rise in coronary vascular resistance in the pregnant than nonpregnant groups and increased renal and cerebral vascular resistance in the pregnant animals only. ANG II infusion raised blood pressure and systemic and renal vascular resistance and lowered cardiac output and renal blood flow in vehicle-treated animals. Glibenclamide augmented ANG II-induced systemic vasoconstriction in the nonpregnant and pregnant groups and the rise in uteroplacental vascular resistance in the pregnant animals. We concluded that [Formula: see text] channel activity likely modulates systemic, uterine, and coronary vascular resistance and opposes ANG II-induced systemic vasoconstriction in nonpregnant and pregnant guinea pigs. Pregnancy augments[Formula: see text] channel activity in the uterine, coronary, renal, and cerebral vascular beds and the uteroplacental circulation during ANG II infusion. Thus increased[Formula: see text] channel activity appears to influence regional control of vascular resistance during guinea pig pregnancy but cannot account for the characteristic decrease in systemic vascular resistance and ANG II-induced systemic vasoconstrictor response.

Regional vascular resistance during exercise: role of cardiac afferents and exercise training

1990 ◽  
Vol 258 (3) ◽  
pp. H842-H847 ◽  
Author(s):  
S. E. DiCarlo ◽  
V. S. Bishop
Keyword(s):  
Exercise Training ◽  
Vascular Resistance ◽  
Endurance Exercise ◽  
Vagal Afferents ◽  
Inhibitory Influence ◽  
Endurance Exercise Training ◽  
Exercise Training Program ◽  
Before And After ◽  
Regional Vascular Resistance ◽  
Cardiac Afferents

This study was designed to determine whether cardiac vagal afferents exert an inhibitory influence on increases in regional vascular resistance during exercise and to determine whether endurance exercise training enhances the inhibitory influence of cardiac vagal afferents. We measured changes in regional vascular resistance in 12 rabbits at rest and during running at 12.6 m/min, 20% grade, before and after reversible denervation of cardiac afferents (intrapericardial procainamide HCl, 2%). In addition, these procedures were repeated in five of these rabbits following an 8-wk endurance exercise training program. Because intrapericardial injections of procainamide anesthetize both the efferent as well as the afferent innervation to the heart, it was necessary to determine the effects of blocking the efferent innervation on the regulation of regional vascular resistance during exercise. Rabbits were instrumented with Doppler ultrasonic flow probes around the renal (R), mesenteric (M), ascending, and terminal aortic (TA) arteries. Catheters were positioned in the central ear artery and vein and pericardial sac. Mean arterial pressure, heart rate, cardiac output, R, M, TA, and systemic (S) resistances were determined. Exercise changed R (+37 +/- 4%), M (+88 +/- 9%), TA (-62 +/- 6%), and S (-34 +/- 3) resistances. Subsequent cardiac efferent blockade alone had no significant effect on regional vascular resistance during exercise. Combined efferent and afferent blockade resulted in significant increases in R (+62 +/- 6%) and M resistance (+134 +/- 13%) but did not alter TA (-51 +/- 4%) or S (-27 +/- 2%) resistance during exercise. Exercise training significantly enhanced the inhibitory influence of cardiac afferents on R and M regional vascular resistance.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals The effect of a combination of laser therapy and handling of medical gymnastics on the indices of hemodynamics with dilated cardiomyopathy

2020 ◽  
Vol 97 (3) ◽  
pp. 69-75
Author(s):  
O.D. Lebedeva ◽  
A.A. Achilov ◽  
A.V. Baranov ◽  
R.D. Mustafaev
Keyword(s):  
Blood Flow ◽  
Dilated Cardiomyopathy ◽  
Laser Therapy ◽  
Vascular Resistance ◽  
Venous Tone ◽  
Functional Load ◽  
Medication Therapy ◽  
Regional Hemodynamics ◽  
Regional Vascular Resistance

The aim of the study: Combined use of kineso- and laser therapy to correct regional hemodynamic disorders in patients with dilated cardiomyopathy (DCMP). Material and methods: The study included 100 patients diagnosed with DCMP. The diagnosis "DCMP" was established for patients with dilatation of the heart cavity of non-coronatural origin, increased heart size (final diastolic size of the left ventricle - LV CDR > 6.0 cm). The determination of the CHF FC was made according to the Russian National Recommendations of the RSCS (2018) and OSSN on the diagnosis and treatment of CHF. All patients took differentiated medication-assisted therapy according to indications during 3 months. Patients were divided into 2 comparable groups by sex, age, disease course, severity of the condition, and specifics of medication therapy. Patients of the 1st group were treated with intravenous laser irradiation of blood (ILIB) and selection of unloading therapeutic gymnastics against the background of supporting differentiated medication therapy. Patients of the 2nd group (control) received only differentiated medication therapy. The main method of investigation was venous occlusal plethysmography to evaluate regional hemodynamics with the determination of blood flow (Qr) and regional vascular resistance (Rr) at rest, venous tone (Vt), reserve blood flow (QH) and regional vascular resistance (RH) on the background of a functional load test. РResults: The data obtained during the dynamic observation (in 1, 3, 6 and 12 months) in the main group showed a reliable increase in the volume velocity of the blood flow at rest (Qr) and the reserve blood flow (QH), a decrease in the regional vascular resistance at rest (Rr) and under functional load (RH), venous tone (Vt), respectively. In the control group there was no reliable positive dynamics, after 12 months of observation indicators of regional hemodynamics significantly deteriorated. Conclusion: In patients with DCMP, according to venous occlusal plethysmography, the use of relieving therapeutic gymnastics in combination with ILIB on the background of medication therapy has significantly improved the indices of regional hemodynamics. The developed method of non-drug therapy can be used by cardiologists, general practitioners, therapists, doctors of physical and rehabilitation medicine to optimize treatment of patients with DCMP.

Sign in / Sign up

Export Citation Format

Share Document