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[Alpha 2-agonists in anesthesia and intensive medicine]
1Abteilung für Anästhesiologie, Universitäts-Krankenhaus Eppendorf, Hamburg.
Summary
Alpha 2-agonists, like clonidine and dexmedetomidine, offer potent analgesic and anesthetic effects by interacting with alpha 2-adrenoceptors. These drugs reduce anesthetic requirements and provide pain relief with minimal respiratory impact.
Area of Science:
- Pharmacology
- Neuroscience
- Anesthesiology
Context:
- Adrenaline and noradrenaline are non-selective adrenergic agonists affecting alpha and beta receptors.
- Alpha 2-adrenergic drugs, such as clonidine, have been used clinically for over two decades.
- Alpha 2-agonists exhibit sympatholytic, sedative, anxiolytic, and analgesic properties.
Purpose:
- To review the biochemical properties, signal transduction, and physiological effects of alpha 2-adrenoceptors.
- To explore the anesthetic and analgesic applications of alpha 2-agonists.
- To discuss the selectivity and receptor interactions of drugs like clonidine and dexmedetomidine.
Summary:
- Alpha 2-agonists decrease sympathetic outflow, leading to hypotensive effects.
- Dexmedetomidine is a highly selective alpha 2-adrenoceptor agonist with potent anesthetic and analgesic effects.
- These agonists reduce anesthetic requirements, cerebral blood flow, and intraocular pressure, while also providing pain relief.
Impact:
- Alpha 2-agonists offer significant pain reduction during and after surgery, and for intractable cancer pain.
- They demonstrate powerful analgesic and anesthetic effects, potentially reducing the need for other anesthetic agents.
- Alpha 2-agonists have minimal respiratory effects and can reduce salivary flow and gastrointestinal motility.