What is the pharmacology of the autonomic nervous system?
Autonomic pharmacology is the study of how drugs interact with the autonomic nervous system. An understanding of how drugs can interact with the autonomic nervous system allows us to appreciate the therapeutic uses of these drugs, and to predict their likely adverse effects.
How do you measure autonomic nervous system activity?
By isolating a specific frequency range of variability, referred to as High Frequency HRV (HF HFV), we can derive a pure index of parasympathetic nervous system activity. To measure this phenomenon, an Electrocardiogram (ECG) is used to measure the fluctuations in the electrical activity of the heart.
What are 4 things the autonomic nervous system controls?
The autonomic nervous system controls internal body processes such as the following:
- Blood pressure.
- Heart and breathing rates.
- Body temperature.
- Digestion.
- Metabolism (thus affecting body weight)
- The balance of water.
- The production of body fluids (saliva, sweat, and tears)
- Urination.
What drugs are used in sympathetic nervous system?
The sympathetic system is affected by drugs that mimic the actions of adrenergic molecules (norepinephrine and epinephrine) and are called sympathomimetic drugs. Drugs such as phenylephrine bind to the adrenergic receptors and stimulate target organs just as sympathetic activity would.
What are examples of autonomic drugs?
Autonomic drugs can either inhibit or enhance the functions of the parasympathetic and sympathetic nervous systems….Examples.
| Types | Examples |
|---|---|
| Non-selective adrenergic agonist | Adrenaline & Noradrenaline |
| Selective ⍺1 agonist | Phenylephrine |
| Selective ⍺2 agonist | Clonidine |
| Selective β1 agonist | Dobutamine |
How drugs affects the autonomic nervous system?
The autonomic system is affected by a number of exogenous agents, including some that are therapeutic and some that are illicit. These drugs affect the autonomic system by mimicking or interfering with the endogenous agents or their receptors.
How is Valsalva ratio calculated?
The Valsalva Ratio (VR) is calculated as the maximum Heart Rate (max HR), which occurs during or shortly after the VWM, divided by the minimum Heart Rate (min HR), with the cessation of the VWM. (VR=max HR/min HR). A normal Valsalva Ratio (VR) reflects intact Baroreceptors –mediated rise and fall in HR.
What is an autonomic test?
What is autonomic testing? Autonomic testing helps find out if your autonomic nervous system (ANS) is working as well as it should. Your ANS controls body functions that happen automatically (without you thinking about them). These include breathing, heartbeat, body temperature, and digestion.
How the autonomic nervous system controls homeostasis?
The ANS regulates the internal organs to maintain homeostasis or to prepare the body for action. The sympathetic branch of the ANS is responsible for stimulating the fight or flight response. The parasympathetic branch has the opposite effect and helps regulate the body at rest.
How do autonomic drugs function?
By acting on the receptors and acetylcholinesterase involved in transmission of nerve signals, autonomic drugs can be adopted to stimulate or inhibit the parasympathetic nervous system to achieve therapeutic effects.
Why are autonomic drugs used topically?
Medically they are used most often for urinary retention or topically for their miotic effect in glaucoma, eg, pilocarpine (Pilocar). Pilocarpine is an agonist at muscarinic receptors and can also be used to promote salivation for the treatment of xerostomia in patients with radiation induced salivary dysfunction.