Effects of Bilateral Vagotomy on Renal Function in the Rat

1971 ◽  
Vol 49 (5) ◽  
pp. 420-426 ◽  
Author(s):  
Paul F. Mercer
Keyword(s):  
Blood Pressure ◽  
Renal Function ◽  
Carotid Arteries ◽  
Control Group ◽  
Vagus Nerves ◽  
Renal Nerve ◽  
Arterial Blood ◽  
Before And After ◽  
Bilateral Vagotomy ◽  
Common Carotid Arteries

Renal function was studied in rats before and after section of the vagus nerves at the level of the common carotid arteries. In the control group of rats, sodium output and volume rate of urine flow increased following vagal section but glomerular filtration rate did not change. This response was not altered in other rats by desoxycorticosterone acetate, vasopressin, or renal nerve section. This response was similar to that seen in rats in which both common carotid arteries had been occluded. The natriuresis following bilateral vagotomy did not occur in rats in which the blood pressure was prevented from rising by means of aortic constriction. It is concluded that a natriuresis does occur following bilateral vagotomy. This natriuresis may be a result of the effect of arterial blood pressure following the vagotomy.

scholarly journals Autoregulation in the Middle Meningeal Artery

1996 ◽  
Vol 16 (3) ◽  
pp. 507-516 ◽  
Author(s):  
J. Michalicek ◽  
V. Gordon ◽  
G. Lambert
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Carotid Arteries ◽  
Middle Meningeal Artery ◽  
Gain Factor ◽  
Arterial Blood ◽  
Neuronal Mechanisms ◽  
Flow Through ◽  
Common Carotid Arteries ◽  
Meningeal Artery

In cats anesthetized with α-chloralose, auto-regulation of blood flow (F) in the middle meningeal and common carotid arteries was assessed by bleeding and subsequently reinfusing the animals to achieve a 25% step reduction in mean arterial blood pressure (P), while maintaining the systolic blood pressure >80 mmHg. The integrity of autoregulation was assessed by calculating the gain factor Gf = 1 — [(ΔF/F)/(ΔP/P)]. Cats were examined intact, after hexamethonium (10 mg/kg), and after papaverine (6 mg/kg). Reduction of blood pressure of 25 to 60 mmHg produced equivalent drops in carotid blood flow ( Gf = 0.041 ± 0.34; mean ± standard deviation, n = 12). There were only small changes in flow in the middle meningeal artery during this procedure ( Gf = 0.91 ± 0.29). Hexamethonium did not block autoregulation in the middle meningeal artery ( Gf = 0.92 ± 0.13, n = 4). However, papaverine almost completely abolished the ability of the artery to autoregulate ( Gf = 0.10 ± 0.16, n = 7). The results suggest that the middle meningeal artery possesses an ability similar to that of the cortical circulation to autoregulate its blood flow through intrinsic, non-neuronal mechanisms. This will have important implications for the study of disturbances of dural arterial control in migraine and other headaches.

scholarly journals Spinal Sympathetic Reflexes in the Cat and the Pathogenesis of Arterial Hypertension

1974 ◽  
Vol 48 (s2) ◽  
pp. 259s-260s ◽  
Author(s):  
A. Malliani ◽  
F. Lombardi ◽  
M. Pagani ◽  
G. Recordati ◽  
P. J. Schwartz
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Carotid Arteries ◽  
Left Ventricular ◽  
Nerve Roots ◽  
Cervical Nerve ◽  
Arterial Blood ◽  
Sympathetic Reflexes ◽  
Common Carotid Arteries ◽  
Cervical Nerve Roots

1. In vagotomized anaesthetized cats with both common carotid arteries occluded, stretch of the thoracic aorta induced reflex increases in arterial blood pressure, heart rate and left ventricular dP/dtmax.. Similar responses were obtained in cats with spinal transection at the level of the first cervical nerve roots. 2. The hypothesis is advanced that sympathetic excitatory reflexes may contribute to the maintenance of hypertension through positive feedback.

Mechanisms of Respiratory Responses to Vasodilator Drugs Urecholine (Carbaminoyl Beta-Methylcholine) and Nitroglycerine

1957 ◽  
Vol 189 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Robert T. Schopp ◽  
Thomas M. Gilfoil ◽  
William B. Youmans
Keyword(s):  
Blood Pressure ◽  
Sodium Cyanide ◽  
Respiratory Response ◽  
Vasodilator Drugs ◽  
Arterial Blood ◽  
Before And After ◽  
Bilateral Vagotomy ◽  
Alpha Chloralose ◽  
Respiratory Stimulation ◽  
Respiratory Responses

The effects on respiratory rate and amplitude following intravenous injection of the vasodilator drugs, Urecholine (carbaminoyl-beta-methylcholine) and nitroglycerine were determined in dogs before and after bilateral vagotomy and isolation of the carotid sinuses. The animals were anesthetized with sodium pentothal followed by alpha-chloralose (70 mg/kg). Following the procedures for denervation of sino-aortic pressoreceptors and carotid and aortic chemoreceptors the animals showed no respiratory response to 1–2 mg sodium cyanide. It was found that the respiratory stimulation which occurs during the fall in blood pressure induced by injection of Urecholine or nitroglycerine frequently persists after sino-aortic denervation. The respiratory stimulation in the denervated animals in response to nitroglycerine was reduced or prevented in individual experiments by counteracting the fall in arterial blood pressure by means of a pressure-regulating device. It is concluded that in the dosage used nitroglycerine, and possibly also Urecholine, exert their effects on respiration indirectly by causing alterations in blood pressure or blood flow rather than through any specific action on the respiratory center.

scholarly journals Acute Effects of Smoking on Heart Rate and Peripheral Resistance in Young Smokers

2015 ◽  
Vol 32 (4) ◽  
pp. 287-292
Author(s):  
Ana Mrkaić ◽  
Suzana Branković ◽  
Pavle Randjelović ◽  
Milica Veljković ◽  
Ivan Pavlović ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Peripheral Resistance ◽  
Peripheral Circulation ◽  
Control Group ◽  
Acute Effects ◽  
Arterial Blood ◽  
Before And After ◽  
Vessel Flow ◽  
Harmful Effects

SummarySmoking has many harmful effects on human body. It is well known that smoking is one of the most important risk factors for cardiovascular diseases. Though the ingredients from cigarette smoke stimulate the release of vasoconstrictor and reduce the release of vasodilator substances, the goal of this study was to investigate the acute effects of smoking on arterial blood pressure, heart rate and blood vessel flow.The investigation was conducted on forty healthy volunteers divided into two groups of twenty non-smokers (control group), and twenty smokers (experimental group). The group of smokers was examined before and after smoking four cigarettes during one hour. Blood pressure and electrocardiograph (ECG) were measured by common methods. Brecht’s and Boucke’s methods of plethysmography were used to evaluate the peripheral circulation.There were no differences in measured systolic and diastolic blood pressure and recorded ECG between non-smokers and smokers, neither between smokers before and after smoking. However, heart rate was increased by 29.57% after smoking in comparison to the value before smoking.Evaluation of plethysmographic parameters showed that amplitude was significantly decreased. Parameters of peripheral resistance were very increased: ductility was decreased by over 20%.It can be concluded that acute smoking does not significantly affect the level of blood pressure, although it increases heart rate. The shape of plethysmograms showed decreased systolic filling and decreased diameters of blood vessels.

PENGARUH TERAPI TERTAWA TERHADAP PENURUNAN TEKANAN DARAH LANSIA DI UPT PANTI WREDHA BUDHI DHARMA YOGYAKARTA

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Niken Setyaningrum ◽  
Andri Setyorini ◽  
Fachruddin Tri Fitrianta
Keyword(s):  
Blood Pressure ◽  
Data Analysis ◽  
The Elderly ◽  
Control Group ◽  
Group Comparison ◽  
Control Blood Pressure ◽  
Men And Women ◽  
Treatment Of Hypertension ◽  
Before And After ◽  
The Difference

ABSTRACTBackground: Hypertension is one of the most common diseases, because this disease is suffered byboth men and women, as well as adults and young people. Treatment of hypertension does not onlyrely on medications from the doctor or regulate diet alone, but it is also important to make our bodyalways relaxed. Laughter can help to control blood pressure by reducing endocrine stress andcreating a relaxed condition to deal with relaxation.Objective: The general objective of the study was to determine the effect of laughter therapy ondecreasing elderly blood pressure in UPT Panti Wredha Budhi Dharma Yogyakarta.Methods: The design used in this study is a pre-experimental design study with one group pre-posttestresearch design where there is no control group (comparison). The population in this study wereelderly aged over> 60 years at 55 UPT Panti Wredha Budhi Dharma Yogyakarta. The method oftaking in this study uses total sampling. The sample in this study were 55 elderly. Data analysis wasused to determine the difference in blood pressure before and after laughing therapy with a ratio datascale that was using Pairs T-TestResult: There is an effect of laughing therapy on blood pressure in the elderly at UPT Panti WredhaBudhi Dharma Yogyakarta marked with a significant value of 0.000 (P <0.05)

scholarly journals A METHOD TO DETERMINE THE PERIPHERAL ARTERIAL BLOOD PRESSURE IN THE MOUSE

1941 ◽  
Vol 74 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Philip D. McMaster
Keyword(s):  
Blood Pressure ◽  
Systolic Blood Pressure ◽  
Arterial Blood Pressure ◽  
Close Agreement ◽  
Carotid Arteries ◽  
Systolic Pressure ◽  
Arterial Blood ◽  
Relative Transparency ◽  
Direct Measurements ◽  
Peripheral Arterial

Advantage has been taken of the relative transparency of the claw of the mouse to devise a method, here described, to measure the blood pressure in the animal's leg. Direct measurements of the systolic blood pressure from the carotid arteries of anesthetized mice have also been made. Simultaneous blood pressure readings by both these methods applied to the same animal showed close agreement. The systolic pressure ranged from 60 to 126 mm. Hg, according to the conditions.

scholarly journals Accumulation of Prostacyclin in Rat Brain during Haemorrhagic Hypotension—Possible Role of PGI2 in Autoregulation

1984 ◽  
Vol 4 (1) ◽  
pp. 107-109 ◽  
Author(s):  
E. Shohami ◽  
A. Sidi
Keyword(s):  
Blood Pressure ◽  
Steady State ◽  
Control Group ◽  
Prostaglandin E ◽  
Cortical Tissue ◽  
Arterial Blood ◽  
Haemorrhagic Hypotension ◽  
Potent Vasodilator ◽  
Prostaglandin F

The effect of haemorrhagic hypotension on the levels of prostaglandin E2 (PGE2), thromboxane B2 (TXB2), and 6-keto prostaglandin F1α (6-keto-PGF1α) in cortical tissue of rats was studied. Lightly anesthetized rats were subjected to steady-state hypotension for 15 min, with a mean arterial blood pressure of 80, 60, and 40 mm Hg, and compared to a control group of normotensive rats. No significant change was found in the levels of PGE2 and TXB2. The level of 6-keto-PGF1α increased from 7.8 ± 0.9 to 14.1 ± 1.9 pg/mg protein (p < 0.02) at 80 mm Hg. Our findings suggest that prostacyclin, which is a potent vasodilator, might play a role in setting the lower limit of the autoregulation range.

scholarly journals Effects of Aroma Massage on Home Blood Pressure, Ambulatory Blood Pressure, and Sleep Quality in Middle-Aged Women with Hypertension

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Myeong-Sook Ju ◽  
Sahng Lee ◽  
Ikyul Bae ◽  
Myung-Haeng Hur ◽  
Kayeon Seong ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Placebo Group ◽  
Sleep Quality ◽  
Nursing Intervention ◽  
Home Blood Pressure ◽  
Control Group ◽  
Middle Aged ◽  
Significant Difference ◽  
Before And After ◽  
Massage Group

The purpose of this study was to evaluate the effects of aroma massage applied to middle-aged women with hypertension. The research study had a nonequivalent control group, nonsynchronized design to investigate the effect on home blood pressure (BP), ambulatory BP, and sleep. The hypertensive patients were allocated into the aroma massage group (n=28), the placebo group (n=28), and the no-treatment control group (n=27). To evaluate the effects of aroma massage, the experimental group received a massage with essential oils prescribed by an aromatherapist once a week and body cream once a day. The placebo group received a massage using artificial fragrance oil once a week and body cream once a day. BP, pulse rate, sleep conditions, and 24-hour ambulatory BP were monitored before and after the experiment. There was a significant difference in home systolic blood pressure (SBP) (F=6.71,P=0.002) between groups after intervention. There was also a significant difference in SBP (F=13.34,P=0.001) and diastolic blood pressure (DBP) (F=8.46,P=0.005) in the laboratory between aroma massage and placebo groups. In sleep quality, there was a significant difference between groups (F=6.75,P=0.002). In conclusion, aroma massage may help improve patient quality of life and maintain health as a nursing intervention in daily life.

Comparative study on effect of neutral spinal bath and neutral spinal spray on blood pressure, heart rate and heart rate variability in healthy volunteers

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
Arundhati Goley ◽  
A. Mooventhan ◽  
NK. Manjunath
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Healthy Volunteers ◽  
Group Analysis ◽  
Low Frequency ◽  
Single Session ◽  
Arterial Blood ◽  
Before And After ◽  
Instantaneous Heart Rate

Abstract Background Hydrotherapeutic applications to the head and spine have shown to improve cardiovascular and autonomic functions. There is lack of study reporting the effect of either neutral spinal bath (NSB) or neutral spinal spray (NSS). Hence, the present study was conducted to evaluate and compare the effects of both NSB and NSS in healthy volunteers. Methods Thirty healthy subjects were recruited and randomized into either neutral spinal bath group (NSBG) or neutral spinal spray group (NSSG). A single session of NSB, NSS was given for 15 min to the NSBG and NSSG, respectively. Assessments were taken before and after the interventions. Results Results of this study showed a significant reduction in low-frequency (LF) to high-frequency (HF) (LF/HF) ratio of heart rate variability (HRV) spectrum in NSBG compared with NSSG (p=0.026). Within-group analysis of both NSBG and NSSG showed a significant increase in the mean of the intervals between adjacent QRS complexes or the instantaneous heart rate (HR) (RRI) (p=0.002; p=0.009, respectively), along with a significant reduction in HR (p=0.002; p=0.004, respectively). But, a significant reduction in systolic blood pressure (SBP) (p=0.037) and pulse pressure (PP) (p=0.017) was observed in NSSG, while a significant reduction in diastolic blood pressure (DBP) (p=0.008), mean arterial blood pressure (MAP) (p=0.008) and LF/HF ratio (p=0.041) was observed in NSBG. Conclusion Results of the study suggest that 15 min of both NSB and NSS might be effective in reducing HR and improving HRV. However, NSS is particularly effective in reducing SBP and PP, while NSB is particularly effective in reducing DBP and MAP along with improving sympathovagal balance in healthy volunteers.

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