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Inhibitory GABA Agonist - Coggle Diagram
Inhibitory
GABA Agonist
Propofol
Info
Exists as oil at room temp
Highly lipid soluble
Insoluble in aqueous solution
Requires preservative to prevent bacterial growth
Emulsion
Propofol
Soybean oil
Glycerol
Egg phosphatide
MOA
Decrease rate of GABA dissociation
Increased Cl- channel opening
Hyperpolarize the postsynatic
AT HIGH, Activates GABA receptors
Addition
Increased affinity of glycine
Inhibit NMDA receptor
Block nicotinic receptors in brain
Inhibits lysophosphatidate signaling
Pharmacokinetics
Redistribute out of central compartment
Low k31
High k10
Short context-sensitive decrement time
Rapid awakening
Pharmacodynamics
CNS
Decreased CMRO2
Burst suppression
Neuroprotection
Cardiovascular
Vasodilation
Attenuated baroreflex (mild increase HR)
Respiratory
GREATEST Apnea
Decreased RR and Tidal Volume
Decreased Upper Airway Reflex
Other
ANTIEMETIC
Propofol INFUSION SYNDROME
Dosing
Induction
Adult: 1.5-2.5 mg/kg
Children: 2-3 mg/kg
Elder: Reduce by 25-50%
Maintenance
100-300 mcg/kg/min
Etomidate
MOA
Increases the affinity of GABA
Hyperpolarize the postsynaptic
Increased Cl- channel opening
Pharmacokinetics
Metabolized primarily by ester hydrolysis
Redistributes out of central compartment
Brief duration of action
Short context-sensitive half-life
Pharmacodynamics
CNS
Decreased CBF and CMRO2
Activates seizures
Produces MYOCLONIC movement
Cardiovascular
LEAST EFFECTED : HR and BP
Respiratory
Decreased RR
Other
Adrenocortical Suppression
Pain
INCREASED postoperative nausea and vomiting
Dosing
Induction
0.2 - 0.4 mg/kg
NOT FOR Maintenance
Clinical Implications
Compromised CV status
Elevated ICP
Electroconvulsive Therapy
Benzodiazepines
MOA
Increased affinity of GABA receptors
Increased Cl- channel opening
Increased Cl- conductance
Hyperpolarize the postsynaptic
Resistance to excitation
Effects
Anxiolysis
Sedation
Anticonvulsant
Muscle Relaxtion
Amnesia
Dosing
Preoperative Anxiety
Oral Adult: Diazepam 5-15 mg
Oral Children: Midazolam 0.25 - 1 mg/kg
Nasal: Midazolam 0.2 mg/kg
Induction
Midazolam 0.05-0.15 mg/kg
Maintenance
Midazolam 1 mcg/kg/min
PRN Bolus: Midazolam 0.05 mg/kg
Sedation
PRN Bolus: Midazolam 0.5-1 mg
PRN Bolus: Diazepam 2 mg
PRN Bolus: Lorazepam 0.25 mg
Pharmacodynamics
CNS
Cardiovascular
Respiratory
REVERSAL:
Flumazenil
Barbiturates