Peripheral Haemodynamics and Renal Function in Relation to the Menstrual Cycle

1996 ◽  
Vol 91 (2) ◽  
pp. 163-168 ◽  
Author(s):  
E. Van Beek ◽  
A. J. H. M. Houben ◽  
P. N. Van Es ◽  
C. Willekes ◽  
E. C. C. M. Korten ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Glomerular Filtration Rate ◽  
Menstrual Cycle ◽  
Glomerular Filtration ◽  
Luteal Phase ◽  
Filtration Rate ◽  
Vascular Tone ◽  
Vascular Relaxation ◽  
Arterial Blood

1. The objective of this study was to investigate whether the luteal phase of the menstrual cycle differs from the follicular phase by the development of a state of general vascular relaxation. 2. Once in the follicular and once in the luteal phase of the menstrual cycle, we measured by non-invasive techniques: arterial blood pressure (by finger blood pressure measurements), vascular tone (by pulse-wave velocity and plethysmography), blood flow to skin (by laser-Doppler), blood flow to forearm (by plethysmography) and blood flow to kidneys (by para-aminohippurate clearance), and the glomerular filtration rate (by inulin clearance). The data points obtained in the luteal phase were compared with those in the follicular phase by non-parametric tests. 3. Arterial blood pressure, vascular tone and the blood flows to the forearm and kidneys were comparable in the two phases of the menstrual cycle. In contrast, the blood flow to the skin was consistently lower, and the glomerular filtration rate higher in the luteal phase of the menstrual cycle. 4. The results of the present study do not support our hypothesis of a general vascular relaxation in the luteal phase of the menstrual cycle. The lower skin flow in the luteal phase may be an adaptation needed to ensure the higher core temperature of 0.3–0.5°C in the luteal phase. The higher glomerular filtration rate was in most cases paralleled by a higher renal blood flow in the luteal phase. This suggests that the higher glomerular filtration rate is secondary to a selective vasorelaxation of the afferent renal arterioles.

The Effects of Vandellia Cordifolia on Renal Functions and Arterial Blood Pressure

1989 ◽  
Vol 17 (03n04) ◽  
pp. 203-210
Author(s):  
Huei-Yann Tsai ◽  
Ruey-Tean Chiang ◽  
Tzu-Wei Tan ◽  
Ho-Chan Chen
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Renal Blood Flow ◽  
Filtration Rate ◽  
Renal Tubules ◽  
Diuretic Effect ◽  
Renal Functions ◽  
Arterial Blood

Vandellia cordifolia (COLSM) G, DON of Scrophulariaceae (V. cordifolia) is an annual wild herb indigenous to Taiwan. It can be found in plains, low altitudes, swampy places, and paddy fields. Taiwanese folk physicians use it in "nephritis, uremia, furnucle, carbuncle." The LD50 (95% confidence limit) of the crude exract of V. codifolia given by the oral route was more than 10 g/kg in rats. By the intraperitoneal route, it was 4.6 g/kg (4.35–4.93), The extraction rate was 16.6%. We studied its effects on renal functions and blood pressure and found that (1) it had diuretic effect on normal rats, (2) it decreased glomerular filtration rate and renal blood flow on normal kidneys in rabbits, (3) it had no effects on glomerular filtration rate and renal blood flow on glycerin-induced insufficient kidneys in rabbits, (4) it had diuretic effects on both normal and glycerin-induced insufficient kidneys in rabbits, (5) it could inhibit Na+ and K+ reabsorptionn on normal and glycerin-induced insufficient kidneys in rabbits, (6) it had hypertensive effect and this effect could be blocked by phenoxybenzamine. From the above facts, we conclude that V, cordifolia had diuretic effect and it may act on renal tubules to inhibit Na+ and K+ reabsorption.

The giraffe kidney tolerates high arterial blood pressure by high renal interstitial pressure and low glomerular filtration rate

2015 ◽  
Vol 214 (4) ◽  
pp. 497-510 ◽  
Author(s):  
M. Damkjaer ◽  
T. Wang ◽  
E. Brøndum ◽  
K. H. Østergaard ◽  
U. Baandrup ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Arterial Blood Pressure ◽  
Filtration Rate ◽  
Interstitial Pressure ◽  
Arterial Blood

The Effect of Glucagon on Glomerular Filtration Rate in Dogs During Reduction of Renal Blood Flow

1975 ◽  
Vol 53 (4) ◽  
pp. 660-668 ◽  
Author(s):  
Mortimer Levy
Keyword(s):  
Blood Flow ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Acute Tubular Necrosis ◽  
Filtration Rate ◽  
Renal Perfusion ◽  
Beneficial Effects ◽  
Tubular Necrosis ◽  
Arterial Blood ◽  
Urine Formation

Glucagon in small intravenous (i.v.) doses markedly increases glomerular filtration rate (GFR) in normal anesthetized dogs. In this study, the effects of glucagon 5 μg/min (i.v.) on renal hemodynamics was tested in four canine models of acute pre-renal failure (hemorrhage, barbiturate overdose; renal arterial clamping and renal arterial infusions of noradrenaline) and in a model of unilateral acute tubular necrosis at 4 h and 6–7 days following completion of the ischemic insult. Following hemorrhage and barbiturate excess, with arterial blood pressure maintained at 65–70 mm Hg, whole-kidney GFR and clearance rate of p-aminohippurate decreased by 50–70%. During this reduction of perfusion pressure, the subsequent infusion of glucagon increased GFR by 90–130%. In models where arterial pressure was normal during the period of ischemia (clamping and noradrenaline infusion), not only did glucagon significantly increase renal perfusion, but the ischemic kidney proved to be far more sensitive to the hemodynamic effects of glucagon (ΔGFR = 120–160%) than the contralateral control (ΔGFR = 30–40%). In three dogs completely anuric following renal arterial clamping, glucagon was able to improve blood flow and restart urine formation. Glucagon, but not dopamine, was able to simulate the beneficial effects of hypertonic mannitol on renal function in dogs with hemorrhagic hypotension. Glucagon was without effect in established acute tubular necrosis. This study, therefore, indicates that, during renal ischemia, glucagon may be quite effective in preserving urine output and perfusion of the kidneys.

Effects of various sympathicomimetic drugs on renal hemodynamics in normotensive and hypotensive dogs

1960 ◽  
Vol 198 (6) ◽  
pp. 1279-1283 ◽  
Author(s):  
Lewis C. Mills ◽  
John H. Moyer ◽  
Carrol A. Handley
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Renal Blood Flow ◽  
Adrenergic Receptors ◽  
Filtration Rate ◽  
Renal Hemodynamics ◽  
Marked Activity ◽  
Renal Vascular

The effects of l-epinephrine, l-norepinephrine, phenylephrine, methoxamine, metaraminol and mephentermine on renal hemodynamics were studied in six groups of dogs. Although comparable rises in blood pressure were obtained, there were marked differences in the effects on renal hemodynamics. While infusion of mephentermine led to only slight reductions in glomerular filtration rate and renal blood flow, and only a slight increase in renal vascular resistance, methoxamine produced a marked fall in flow and a marked increase in resistance. The other agents tested had effects which were intermediate between these two. The effects of these same drugs on renal hemodynamics were also compared in dogs made hypotensive by bleeding. While blood pressure increased significantly in all groups, glomerular filtration rate and renal blood flow increased significantly only during infusion of mephentermine, metaraminol and phenylephrine. Since assays relative to the inherent vasodilator properties of these agents revealed epinephrine to be the only agent with marked activity, it seems unlikely that the observed effects were due to this factor. It is concluded that the observed changes were due to a greater reactivity of renal vascular vasoconstrictor adrenergic receptors with certain sympathicomimetic drugs than those of the vasculature in general.

Abstract 386: A Novel Aquaretic and Glomerular Filtration Rate Enhancing Peptide Without Vascular Vasodilatory Actions in Experimental CHF.

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Horng H Chen ◽  
ShuChong Pan ◽  
John C Burnett ◽  
Robert D Simari
Keyword(s):  
Blood Pressure ◽  
Amino Acids ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Filtration Rate ◽  
Urinary Sodium Excretion ◽  
Sodium Concentration ◽  
Water Excretion ◽  
Arterial Blood ◽  
Change In Mean

BACKGROUND: BNP is a cardiac peptide with vasodilatory, natriuretic and diuretic properties. Recent studies have suggested that its vasodilatory hypotensive properties may limit the renal actions of BNP, especially in patients with borderline low blood pressure. We have recently identified an alternatively spliced transcript for BNP (ASBNP) that includes a unique and distinct longer carboxyl-terminus consisting of 34 amino acids. Based upon preliminary studies, we generated a truncated form (ASBNP2.1) that contains the first 16 amino acids of the C-terminal of ASBNP. METHODS: We determined the cardiorenal and humoral actions of intravenous infusion of ASBNP2.1 at 2 pmol/Kg/min, 10 pmol/Kg/min and 100 pmol/Kg /min in 10 dogs with rapid ventricular pacing induced overt CHF (240 bpm for 10 days). * p<0.05 RESULTS: IV infusion of ASBNP 2.1 increased aquaresis (from 0.19±0.04 to 0.32±0.07, 0.46±0.11 and 0.39±0.09 ml/min*) without a significant change in urinary sodium excretion. Importantly, ASBNP 2.1 enhanced glomerular filtration rate (GFR), from 31±4 to 47±8, 69±10 and 56±9 ml/min*. These renal actions were associated with increases in urinary BNP*, ANP* and cGMP* excretion. BNP 2.1 did not have any systemic vasodilatory action resulting in no change in mean arterial blood pressure or cardiac-filling pressures even at the highest dose. There was not change in serum sodium concentration. CONCLUSION: We report for the first time that this novel peptide based upon ASBNP has potent aquaretic and GFR enhancing actions without the vasodilatory hypotensive properties in an experimental model of overt CHF. The lack of vasodilatation but with renal actions also suggest that the C-terminus plays a key role in the vascular actions of this peptide offering new insights into vascular-renal structure function of BNP and related peptides. This renal specific peptide may have potential therapeutic benefit in states of renal dysfunction with volume overload to enhance GFR and water excretion without the detrimental side effect of hypotension.

Differential effect of T-type voltage-gated Ca2+ channel disruption on renal plasma flow and glomerular filtration rate in vivo

2014 ◽  
Vol 307 (4) ◽  
pp. F445-F452 ◽  
Author(s):  
Anne D. Thuesen ◽  
Henrik Andersen ◽  
Majken Cardel ◽  
Anja Toft ◽  
Steen Walter ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Blood Flow ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Plasma Flow ◽  
Filtration Rate ◽  
Renal Plasma Flow ◽  
Voltage Gated

Voltage-gated Ca2+ (Cav) channels play an essential role in the regulation of renal blood flow and glomerular filtration rate (GFR). Because T-type Cav channels are differentially expressed in pre- and postglomerular vessels, it was hypothesized that they impact renal blood flow and GFR differentially. The question was addressed with the use of two T-type Cav knockout (Cav3.1−/− and Cav3.2−/−) mouse strains. Continuous recordings of blood pressure and heart rate, para-aminohippurate clearance (renal plasma flow), and inulin clearance (GFR) were performed in conscious, chronically catheterized, wild-type (WT) and Cav3.1−/− and Cav3.2−/− mice. The contractility of afferent and efferent arterioles was determined in isolated perfused blood vessels. Efferent arterioles from Cav3.2−/− mice constricted significantly more in response to a depolarization compared with WT mice. GFR was increased in Cav3.2−/− mice with no significant changes in renal plasma flow, heart rate, and blood pressure. Cav3.1−/− mice had a higher renal plasma flow compared with WT mice, whereas GFR was indistinguishable from WT mice. No difference in the concentration response to K+ was observed in isolated afferent and efferent arterioles from Cav3.1−/− mice compared with WT mice. Heart rate was significantly lower in Cav3.1−/− mice compared with WT mice with no difference in blood pressure. T-type antagonists significantly inhibited the constriction of human intrarenal arteries in response to a small depolarization. In conclusion, Cav3.2 channels support dilatation of efferent arterioles and affect GFR, whereas Cav3.1 channels in vivo contribute to renal vascular resistance. It is suggested that endothelial and nerve localization of Cav3.2 and Cav3.1, respectively, may account for the observed effects.

Angiotensin-(1–7) in the ovine fetus

2001 ◽  
Vol 280 (2) ◽  
pp. R404-R409 ◽  
Author(s):  
Karen M. Moritz ◽  
Duncan J. Campbell ◽  
E. Marelyn Wintour
Keyword(s):  
Blood Pressure ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Flow Rate ◽  
Filtration Rate ◽  
Plasma Concentrations ◽  
Urine Flow ◽  
Urine Flow Rate ◽  
Ang Ii ◽  
Arterial Blood

In the adult animal, ANG-(1–7) may counterbalance some effects of ANG II. Its effects in the fetus are unknown. Basal ANG-(1–7), ANG I, ANG II, and renin concentrations were measured in plasma from ovine fetuses and their mothers ( n = 10) at 111 days of gestation. In the fetus, concentrations of ANG I, ANG-(1–7), and ANG II were 86 ± 21, 13 ± 2, and 14 ± 2 fmol/ml, respectively. In the ewe, concentrations of ANG I were significantly lower (20 ± 4 fmol/ml, P < 0.05) as were concentrations of ANG-(1–7) (2.9 ± 0.6 fmol/ml), whereas ANG II concentrations were not different (10 ± 1 fmol/ml). Plasma renin concentrations were higher in the fetus (4.8 ± 1.1 pmol ANG I · ml−1 · h−1) than in the ewe (0.9 ± 0.2 pmol · ml−1 · h−1, P < 0.05). Infusion of ANG-(1–7) (∼9 μg/h) for a 3-day period caused a significant increase in plasma concentrations of ANG-(1–7) reaching a maximum of 448 ± 146 fmol/ml on day 3 of infusion. Plasma levels of ANG I and II as well as renin were unchanged by the infusion. Urine flow rate, glomerular filtration rate, and fetal arterial blood pressure did not change and were not different than values in fetuses receiving a saline infusion for 3 days ( n = 5). However, the osmolality of amniotic and allantoic fluid was significantly higher in fetuses that received ANG-(1–7). Also, compared with the saline-infused animals, mRNA expression levels of renin, the AT1 receptor, and AT2 receptor were elevated in kidneys of fetuses that received infusions of ANG-(1–7). Infusion of an ANG-(1–7) antagonist {[d-Ala7]-ANG-(1–7), 20 μg/h} for 3 days had no effect on fetal blood pressure or renal function. In conclusion, although infusion of ANG-(1–7) did not affect fetal urine flow rate, glomerular filtration rate, or blood pressure, changes in fetal fluids and gene expression indicate that ANG-(1–7) may play a role in the fetal kidney.

scholarly journals Captopril-induced fall in glomerular filtration rate in cyclosporine-treated hypertensive patients.

1993 ◽  
Vol 3 (9) ◽  
pp. 1570-1574
Author(s):  
J J Curtis ◽  
D A Laskow ◽  
P A Jones ◽  
B A Julian ◽  
R S Gaston ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Glomerular Filtration Rate ◽  
Renal Transplant ◽  
Glomerular Filtration ◽  
Filtration Rate ◽  
Blood Levels ◽  
Hypertensive Patients ◽  
Transplant Patients ◽  
Renal Transplant Patients

It was found that two known renal vasodilators had different effects on RBF and GFR in the setting of therapeutic blood levels of cyclosporine in hypertensive renal transplant patients. Captopril lowered blood pressure in these patients but also lowered blood flow and GFR. Nifedipine lowered blood pressure to the same degree but without lowering either RBF or GFR.

Diabetic nephropathy in the nurse practice

2020 ◽  
pp. 77-81
Author(s):  
Hedy Muradova ◽  
Vsevolod Skvortsov
Keyword(s):  
Blood Pressure ◽  
Diabetic Nephropathy ◽  
Glomerular Filtration Rate ◽  
Glomerular Filtration ◽  
Kidney Failure ◽  
Filtration Rate ◽  
Clinical Syndrome ◽  
Progressive Decrease ◽  
Arterial Blood ◽  
Kidney Lesions

Diabetic nephropathy (DN) is a clinical syndrome characterized by kidney lesions and formation narrow or diffusion glomerulosclerosis, which later becomes kidney failure. It is manifested by persistent albuminuria (>300 mg/day or >200 μg/min), that is confirmed on at least 2 occasions 3–6 months apart, with a progressive decrease in glomerular filtration rate (GFR) and elevated arterial blood pressure (BP).

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