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17 Questions

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Topical Local Anesthetics

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Questions and Answers

What is the primary mechanism of action of local anesthetics?

Causing loss of consciousness

Removing pain receptors from the skin

Blocking the nerves from the affected part of the body (correct)

Blocking pain signals to the brain

What is the effect of topical anesthesia?

Loss of consciousness

Long-lasting pain relief

Complete loss of feeling to a specific part of the body

Short-lasting pain relief limited to the area of contact (correct)

What is the purpose of a spinal anesthesia?

To act on spinal nerve roots and part of the spinal cord (correct)

To block pain signals to the brain

To produce long-lasting post-surgical analgesia

To cause loss of consciousness

What is a characteristic of regional anesthesia (Bier's block)?

Blocking the blood circulation of the part of the body to be anesthetized Signup and view all the answers

What is the main effect of local anesthetics on the nervous system?

Afferent nervous system Signup and view all the answers

What is the application of local injection anesthesia?

At the end of surgery to produce long-lasting post-surgical analgesia Signup and view all the answers

What is the effect of adding a vasoconstrictive agent to a local anesthetic solution?

Decreased perfusion of blood to the injected area Signup and view all the answers

What is the significance of the 1:100,000 dilution of epinephrine in a local anesthetic solution?

1 gram of epinephrine in 100,000 milliliters of solution Signup and view all the answers

What is the chemical structure of Lidocaine Hydrochloride?

NH(C2H5)2 CH3 NHCOCH2N(C2H5)2.HCl.H2O Signup and view all the answers

What is the purpose of adding vasoconstrictors to local anesthetics?

To counteract the vasodilatory effect of the anesthetic Signup and view all the answers

What is the consequence of using a local anesthetic with a vasoconstrictive agent on the duration of action?

The duration of action is increased Signup and view all the answers

What is a limitation of using sprays for topical application of local anesthetic agents?

Difficulty in controlling the quantity of drug administered Signup and view all the answers

Why are vasoconstrictors added to the solution of local anesthetics?

To counteract the vasodilatory effects of local anesthetics Signup and view all the answers

What is the effect of acidic surroundings on topically applied local anesthetic agents?

It hampers their effective absorption Signup and view all the answers

What is the difference in concentration of lidocaine between injectable and topical forms?

Injectable form is 1%, topical form is 5-10% Signup and view all the answers

What is a consideration for the use of patches in topical application of local anesthetics?

They work best when applied to dry or dried areas Signup and view all the answers

What is the chemical structure of benzocaine?

CH2N NH CH3 CH3 Signup and view all the answers