tachycardia/nikotin

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Hemin blunts the depressant effect of chronic nicotine on reflex tachycardia via activation of central NOS/PI3K pathway in female rats.

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BACKGROUND Chronic nicotine administration impairs reflex chronotropic responses that follow arterial baroreceptor unloading in female rats with repleted, but not depleted (ovariectomized, OVX), estrogen (E2). This study investigated whether products of nitric oxide synthase (NOS) and/or heme

Central estrogenic pathways protect against the depressant action of acute nicotine on reflex tachycardia in female rats.

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We have previously shown that acute exposure of male rats to nicotine preferentially attenuates baroreceptor-mediated control of reflex tachycardia in contrast to no effect on reflex bradycardia. Here, we investigated whether female rats are as sensitive as their male counterparts to the baroreflex

Age-related sensitivity to nicotine for inducible atrial tachycardia and atrial fibrillation.

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The influence of nicotine in modulating vulnerability to atrial tachycardia and fibrillation (AT/AF) remains ill defined. The isolated hearts of six young (2-3 mo) and six old (22-24 mo) male Fischer 344 rats were Langendorff perfused at 5 ml/min with oxygenated Tyrode solution at 37 degrees C, and

Tobacco Amblyopia and Tachycardia.

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Imidacloprid, a neonicotinoid insecticide, facilitates tyrosine hydroxylase transcription and phenylethanolamine N-methyltransferase mRNA expression to enhance catecholamine synthesis and its nicotine-evoked elevation in PC12D cells.

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Imidacloprid is a neonicotinoid insecticide acting as an agonist of nicotinic acetylcholine receptors (nAChRs) in the target insects. However, questions about the safety to mammals, including human have emerged. Overactivation of mammalian peripheral catecholaminergic systems leads to onset of

Effects of smoking/nicotine on anxiety, heart rate, and lateralization of EEG during a stressful movie.

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The effects of smoking cigarettes with differing FTC nicotine deliveries on anxiety and EEG activity were evaluated in 40 smokers who were compared with 40 non-smokers, matched for age and gender. Following smoking (sham-smoking in the case of the non-smokers), the participants viewed a

[Pharmacology of nicotine].

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Nicotine has a small molecular weight and is absorbed via the mucosa (Guccal or nasal), the pulmonary alveoli and the skin. The phenomenon of autotitration explains how a dependent smoker can unconsciously change his method of smoking to maintain a steady nicotine level. Nicotine leads to a

Arrhythmogenic Risk Assessment Following Four-Week Pretreatment With Nicotine and Black Tea in Rat.

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BACKGROUND There is the controversy concerning the main component of tobacco, which is responsible for its arrhythmogenesis. In addition, there is the lack of adequate information about the influence of combination of black tea and nicotine on heart rhythm. OBJECTIVE This study aimed to examine

Nicotine effects on exercise performance and physiological responses in nicotine-naïve individuals: a systematic review.

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The purpose of this systematic review was to evaluate the effects of smokeless forms of nicotine on physiological responses and exercise performance. Methodology and reporting were based on the PRISMA statement. The intervention was defined as any product containing nicotine that did not require

Impaired cardiac function during postnatal hypoxia in rats exposed to nicotine prenatally: implications for perinatal morbidity and mortality, and for sudden infant death syndrome.

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Maternal smoking correlates highly with parturitional/neonatal death including SIDS; nicotine exposure of fetal rats reproduces the increased mortality when animals are tested postnatally with hypoxia. In the current study, pregnant rats received nicotine infusions simulating smokers' plasma

Fatal Suicidal Attempt by Deliberate Ingestion of Nicotine-containing Solution in Childhood-onset Depression Mediated through Internet Suicide Guideline: A Case Report

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Nicotine is one of the most easily accessible, commonly abused drugs worldwide and if taken in overdose can cause serious clinical presentation, including cardiac arrhythmias and neurotoxicity mediated through oxidative stress. Its toxicity though rare can cause sudden deaths by cardiovascular

Effect of high doses of nicotine in pigs. I. Changes of the electrocardiogram.

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Pigs in which venous catheters were positioned for long-term use were injected i.v. with high doses of nicotine in physiol. saline. The LD50 was 2.656 mg/kg body weight. Clinical symptoms were mainly: forced respiration, muscular tremor to tetanoid spasms, cyanosis of the skin, salivation and

Reduction of the pressor response to nicotine in the guinea pigs by a histamine (H3) agonist is attenuated by an inhibitor of nitric oxide synthesis.

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We examined whether a histamine (H3)-agonist, (R) alpha-methylhistamine, [(R) alpha-MeHA] reduced the pressor responses induced by nicotine in urethane-anesthetized guinea pigs treated by atropine. Nicotine dose-dependently increased the basal mean arterial pressure (MAP) and the heart rate (HR) of

Divergent tolerance to metabolic and cardiovascular effects of nicotine in smokers with low and high levels of cigarette consumption.

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Cigarette smokers on average weigh less than nonsmokers. However, among smokers, those who smoke the most weigh the most. To better understand the effects of nicotine on body weight, we investigated the pharmacodynamics of intravenous nicotine and cigarette smoking in low-level smokers (10 or fewer

Fourth ventricle effects of nicotine, 2-methylpiperidine and cytisine in dogs.

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Four distinguishable nicotinic binding sites have been identified as well as four nicotinic ligands with different specificities: (+/-)-2-methylpiperidine which binds to a very high affinity site (Site 1) and produces up-regulation of the high affinity site (Site 2); (-)-nicotine which binds to Site

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