Benzodiazepines effects appear to produce all their pharmacologic effects by facilitating the actions of gamma-amino butyric acid (GABA). The area where it causes it effect is the principal inhibitory neurotransmitter in the CNS by enhancing their affinity towards GABA receptors leading to increased chloride conductance and hyperpolarization of the postsynaptic cell membrane, and thereby rendering […]
The pharmacokinetics of inhaled anesthetics are explained here with detail • Absorption of agent from alveoli to blood • Distribution in the body • Metabolism (liver) • Elimination (lungs mainly) Uptake and Distribution The pharmacokinetics of inhaled anesthetics depends upon: (1) Respiratory uptake, (2) Alveolar ventilation, (3) The partial pressure of the agent in the
The exact site of mechanisms of action of inhalation anesthetics is not certain but possible sites are macroscopic (CNS-brain), microscopic (axons and synapses) and molecular (pre- and postsynaptic membranes). Hence, the possible mechanisms of action of inhalation anesthetics is varied: a) Multiple receptor sites b) Motor inhibition at spinal cord level c) Many neurotransmitters are
Non benzodiazepines like Zolpidem Non benzodiazepines like zopiclone, Zolpidem, zaleplon and efzopiclone (Z agents) are the newer sedative hypnotic agents which have varied chemical structures. They bind selectively to a subset of benzodiazepine receptors and act as benzodiazepine receptor Agonists. Non benzodiazepines characteristic features are: As sedative-hypnotics, they are as effective as benzodiazepines and provide
Propofol at common clinical concentrations-is potent ventilatory depressant and therefore it is sometimes common with the name propofol respiratory depression . The Propofol respiratory depression of ventilation is dose dependent. After induction of anesthesia with propofol apnoea occurs in 25% to 35% of patients which may persist till 3 minutes. It reduces tidal volume (by
Succinylcholine hyperkalemia is hyperkalemia seen after the usage of succinylcholine. Succinylcholine is a depolarizing muscle relaxant used for urgent endotracheal intubation in the operating room, intensive care unit (ICU), and emergency department. The intravenous (IV) dose is 0.5 to 1.5 mg/kg. Time to effect is 1 minute and duration of action in patients with normal
In patients with acute renal failure, total body clearance is lower and the elimination half-life, while considering midazolam duration of action becomes longer than in patients with normal kidney function. In patients with impaired kidney function, the excretion of 1-hydroxymethyl midazolam glucuronide, the major metabolite of midazolam, is impaired. In healthy children aged 1 year
The pharmacodynamics of inhaled anesthetics is discussed here in detail. The action of inhalation agents are as follows: I. Pulmonary effects 2. Cardiovascular effects 3. Metabolism 4. Toxicity Pulmonary Effects: For pharmacodynamics of inhaled anesthetics , the pulmonary effects of inhalation agents are many and important as this is the portal of entry. There are
Lorazepam metabolism is done by glucuronidation in order to form pharmacologically inactive metabolites that are excreted by the kidneys. Lorazepam IV is a long-acting benzodiazepine which is more potent sedative and amnesic than midazolam and diazepam. The effects on ventilation, the cardiovascular system, and skeletal muscles resemble those of other benzodiazepines. The elimination half-time is
Etomidate sedation infusion can be used as a suitable alternative for neuroanesthesia when nitrous oxide is contraindicated. Etomidate sedation (100 micrograms/kg/ minute) has been used as a part of total intravenous anesthetic technique with a mean recovery time of about 10 minutes. The infusion is associated with minimal incidences of side effects such as thrombophiebitis
