View clinical trials related to Caffeine.
Filter by:Viral bronchiolitis is the most common lower respiratory tract infection of infancy. Apnea is a complication of bronchiolitis, reported in 16 - 21% of cases. Caffeine, a trimethylxanthine, acts as an antagonist to endogenous adenosine and a potent central nervous system stimulant. In apnea of prematurity, caffeine is believed to work by increasing central respiratory drive. Infants ≤4 months of age, presenting to pediatric emergency center Al-Sadd, from September 2011 to May 2014, with a diagnosis of viral bronchiolitis associated with apnea. A randomized, double-blind, controlled trial with a sample size of 45 patients per group Data Collection methods, instruments used measurements: Randomization: In the emergency department, the patients will be assigned to either one of the two treatments using a computer-generated randomized numbers in a 1:1 ratio. Pharmacy will prepare sequential sealed vials containing the experimental drugs. Randomization code will be revealed only after all patients completed the study. The medical team in addition to the patients will be blinded to the medication delivered. There will be no detectable difference in the color, smell of the two study treatments. Guardians or parents of eligible infants will be approached regarding the study, explaining the purpose and the treatment modalities. Patients will be included after obtaining a verbal and written consent. Study Intervention: Treatment 1: Single stat dose (25 mg per kilogram of body weight) of intravenous caffeine citrate (25mg caffeine citrate equal to 12.5mg caffeine base). Treatment 2: Placebo with an equivalent volume of normal saline. Calculated study medications will be diluted with Dextrose 5% in Water to 20 ml and will be given intravenous over 30 minutes using syringe infusion pump. After random assignment, eligible infants will receive one of the study treatments. Non-pharmacological therapies may be used as necessary to control apnea. Antibiotics and antipyretics may be used as per the discretion of the treating physician. After stabilization of patients as usually done in Pediatric Emergency Center , patients will be admitted to pediatric intensive care unit (PICU) for further monitoring monitoring when indicated.
Cardiovascular and neuropsychologic effects of coffee are still debated. The precise mechanism underlying the actions of caffeine on the cardiovascular and neuropsychologic systems is incompletely understood and a considerable variability in the response to coffee drinking was observed, in part ascribable to a genetic trait. The aim of the study is to evaluate acute cardiovascular and neuropsychologic effects of coffee and explore whether such effects are influenced by the genetic asset of caffeine metabolism (by a polymorphisms of cytochrome P450 1A2), adenosine metabolism (by polymorphisms of adenosine receptor and adenosine monophosphate deaminase) or catecholamine receptors (by polymorphisms of adrenergic receptors).
The objective of this study is to verify if there is a neurophysiologic reserve when caffeine and placebo perceived as caffeine are manipulated in closed- and opened-loop exercises. Parameters of excitability level of skeletal muscle and Central Nervous System (CNS), and peripheral metabolism will be measured
Ischaemic preconditioning (IP) describes the phenomenon that brief periods of ischaemia render the (myocardial) muscle more resistant to a subsequent more prolonged period of ischaemia and reperfusion. Animal studies have provided evidence that adenosine receptor stimulation is an important mediator of IP. As caffeine is an effective adenosine receptor antagonist already at concentrations reached after regular coffee consumption, we aimed to assess whether caffeine impairs IP in humans in vivo. We used a novel and well-validated model to study IP in humans: 99m-Tc-annexin A5 scintigraphy in forearm skeletal muscle. 24 healthy volunteers were randomly assigned to either caffeine (4 mg/kg/iv in 10 minutes) or saline before a protocol for IP.