نتایج جستجو برای: vagal bradycardia

تعداد نتایج: 13543  

Journal: :Hypertension 1981
J Perez-Olea M Quevedo R Silva

The interaction of dopamine and angiotensin II (AII) on blood pressure and heart rate was studied in rats. The influence of reserpine pretreatment and vagotomy was also studied. Inbred rats anesthetized with urethane received intravenous (i.v.) doses of 50, 100, 200, or 400 micron g (per 100 g body weight) of dopamine HCI, before and after a single i.v. dose of 0.025 micron g of AII. The same d...

Journal: :Journal of the American College of Cardiology 1983
A L Mark

The concept of depressor reflexes originating in the heart was introduced by von Bezold in 1867 and was later revived by Jarisch. The Bezold-Jarisch reflex originates in cardiac sensory receptors with nonmyelinated vagal afferent pathways. The left ventricle, particularly the inferoposterior wall, is a principal location for these sensory receptors. Stimulation of these inhibitory cardiac recep...

Journal: :Journal of applied physiology 2004
K De Angelis R B Wichi W R A Jesus E D Moreira M Morris E M Krieger M C Irigoyen

Experiments were performed to investigate the influence of exercise training on cardiovascular function in mice. Heart rate, arterial pressure, baroreflex sensitivity, and autonomic control of heart rate were measured in conscious, unrestrained male C57/6J sedentary (n = 8) and trained mice (n = 8). The exercise training protocol used a treadmill (1 h/day; 5 days/wk for 4 wk). Baroreflex sensit...

Journal: :American journal of physiology. Regulatory, integrative and comparative physiology 2007
J W Polson R A L Dampney P Boscan A E Pickering J F R Paton

Microinjection of angiotensin II into the nucleus tractus solitarii attenuates the baroreceptor reflex-mediated bradycardia by inhibiting both vagal and cardiac sympathetic components. However, it is not known whether the baroreflex modulation of other sympathetic outputs (i.e., noncardiac) also are inhibited by exogenous angiotensin II (ANG II) in nucleus tractus solitarii (NTS). In this study...

Journal: :Journal of neurophysiology 2004
Zheng-Gui Huang Xin Wang Cory Evans Allison Gold Evguenia Bouairi David Mendelowitz

Nicotinic receptors play an important role in modulating the activity of parasympathetic cardiac vagal neurons in the medulla. Previous work has shown nicotine acts via at least three mechanisms to excite brain stem premotor cardiac vagal neurons. Nicotine evokes a direct increase in holding current and facilitates both the frequency and amplitude of glutamatergic neurotransmission to cardiac v...

Journal: :Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas 2004
A Medeiros E M Oliveira R Gianolla D E Casarini C E Negrão P C Brum

The effect of swimming training (ST) on vagal and sympathetic cardiac effects was investigated in sedentary (S, N = 12) and trained (T, N = 12) male Wistar rats (200-220 g). ST consisted of 60-min swimming sessions 5 days/week for 8 weeks, with a 5% body weight load attached to the tail. The effect of the autonomic nervous system in generating training-induced resting bradycardia (RB) was exami...

Journal: :Circulation 1999
D Flammang M Erickson S McCarville T Church D Hamani E Donal

BACKGROUND In patients with vasovagal syndrome, head-up tilt testing may reproduce symptoms generally associated with vasodepression. Recent research suggests ATP testing identifies patients with abnormal vagal cardiac inhibition. This preliminary study examined the joint contribution of both tests in identifying underlying mechanisms in the general population with vasovagal syndrome. METHODS...

Journal: :Journal of neurophysiology 2007
Kathleen J S Griffioen Harriet W Kamendi Christopher J Gorini Evguenia Bouairi David Mendelowitz

Although oxidative stress and reactive oxygen species generation is typically associated with localized neuronal injury, reactive oxygen species have also recently been shown to act as a physiological signal in neuronal plasticity. Here we define an essential role for reactive oxygen species as a critical stimulus for cardiorespiratory reflex responses to acute episodic hypoxia in the brain ste...

Journal: :Brazilian journal of medical and biological research = Revista brasileira de pesquisas medicas e biologicas 2010
T L Fernandes A C Piratello V Farah P Fiorino E D Moreira M C Irigoyen E M Krieger

We determined the sympathetic and parasympathetic control of heart rate (HR) and the sensitivity of the cardiopulmonary receptors after selective carotid and aortic denervation. We also investigated the participation of the autonomic nervous system in the Bezold-Jarish reflex after selective removal of aortic and carotid baroreceptors. Male Wistar rats (220-270 g) were divided into three groups...

Journal: :Indian journal of physiology and pharmacology 1979
M Kashani M A Khoyi

The influence of vagotomy on resting vagal tone arterial Po2, the heart rate and blood pressure responses to different grades of hypoxia was studied in three species of anesthetized animals. Vagotomy without hypoxia produced a sustained increase in heart rate of dogs but not in rabbits or sheep. In the dogs, where this was studied more fully, heart rate showed sustained increase over several ho...

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