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Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

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Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
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Depolarizing Blockers: Pharmocokinetics01:19

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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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Adrenergic Agonists: Therapeutic Uses01:30

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Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
Allergies and...
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Adrenergic Neurons: Neurotransmission01:27

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Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Related Experiment Video

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Standardized Measurement of Nasal Membrane Transepithelial Potential Difference NPD
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Stability of Epinephrine in a Normal Saline Solution.

Caroline M Sawicki, Daniel B McKim, Hongrui Wang

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    |November 6, 2024
    PubMed
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    Diluted epinephrine remains stable and sterile for up to 90 days in simulated hospital conditions. This finding supports extended storage of emergency medications, enhancing patient safety and reducing waste.

    Keywords:
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    Area of Science:

    • Pharmacology
    • Clinical Pharmacy
    • Emergency Medicine

    Background:

    • Diluting concentrated epinephrine for intravenous use in emergencies can cause delays.
    • Ensuring the stability and sterility of diluted epinephrine is crucial for timely patient care.

    Purpose of the Study:

    • To evaluate the stability and sterility of diluted epinephrine over time.
    • To assess the impact of common hospital storage conditions on epinephrine quality.

    Main Methods:

    • Epinephrine samples were prepared using double dilution techniques.
    • Samples were stored in 10-mL syringes under varied temperature and lighting conditions for up to 90 days.
    • Stability was assessed using capillary zonal electrophoresis, and sterility was tested via blood agar cultures.

    Main Results:

    • Diluted epinephrine samples demonstrated stability for the entire 90-day study period across all tested conditions.
    • No bacterial contamination was detected in any samples, irrespective of storage duration or environment.

    Conclusions:

    • Diluted epinephrine can be considered clinically useful for up to 90 days when stored under simulated hospital conditions.
    • This extended stability can improve medication accessibility, patient safety, and reduce healthcare costs by minimizing drug waste.