Question 1

All of the alpha-2 agonists exhibit both alpha-1 and alpha-2 activity to some degree. Rank the alpha-2 agonists in order form those with the highest ratio of activity of alpha-2:alpha-1, to that with the lowest.

Accepted Answer

Dexmedetomidine is known for its high selectivity for alpha-2 receptors over alpha-1 receptors, making it the most selective among the options listed. Detomidine also has a high alpha-2 to alpha-1 activity ratio but is less selective than dexmedetomidine. Xylazine has the lowest selectivity for alpha-2 receptors when compared to the other two, making D the correct order from highest to lowest alpha-2:alpha-1 activity ratio.

Question 2

Having a greater potency than morphine means a drug used to reduce pain

Accepted Answer

A drug with greater potency than morphine can be used at lower doses to achieve the same effect because potency refers to the amount of drug needed to produce a certain effect.

Question 3

Buprenorphine is an opioid analgesic that is considered to have both agonist and antagonist opioid receptor effects, which allows for the benefit of providing a long duration of effect with fewer adverse effects compared to other drugs in this class. Buprenorphine exhibits agonistic activity at the ___________ receptor, and antagonistic activity at the _____________ receptor.

Accepted Answer

Buprenorphine exhibits agonistic activity at the mu (μ) opioid receptor, which is primarily responsible for its analgesic effects, and antagonistic activity at the kappa (κ) opioid receptor, which contributes to its unique profile and reduced risk of certain side effects compared to full opioid agonists.

Question 4

By decreasing the inflammation process shortly after trauma

Accepted Answer

Decreasing inflammation shortly after trauma helps in reducing the pain because inflammation is a biological response to injury that can cause pain. Reducing inflammation can therefore alleviate pain associated with the trauma.

Question 5

Another name for a pain receptor is

Accepted Answer

Nociceptors are specialized sensory receptors responsible for sensing pain. They are activated by potentially harmful stimuli, sending signals to the brain that are interpreted as pain.

Question 6

Several opioids such as butorphanol and buprenorphine exhibit a limited effect of analgesia regardless of the dose that is administered. This is a phenomenon called the ____________ effect.

Accepted Answer

The ceiling effect refers to the phenomenon where increasing the dose of a drug does not increase its effect beyond a certain point. This is observed with certain opioids like butorphanol and buprenorphine, where there is a limit to the analgesic effect that can be achieved regardless of dose increases.

Question 7

The first step of the pain perception pathway involves the sensation of a noxious stimulus and the subsequent transmission of the painful signal. This process is known as

Accepted Answer

Stimulus transduction is the correct term for the process where a noxious stimulus is converted into an electrical signal that can be transmitted along nerve fibers to the brain, initiating the perception of pain.

Question 8

Which opioid receptor is primarily responsible for the profound analgesia that is characteristic of these narcotics?

Accepted Answer

The mu (μ) opioid receptor is primarily responsible for the profound analgesia characteristic of opioids, as well as for their addictive properties.

Question 9

Acepromazine is a commonly used phenylthiazine tranquilizer used often as a premedication in preparation for general anesthesia induction. Which of the following adverse effects has been discounted recently in regards to veterinary use?

Accepted Answer

Recent studies have shown that the concern about acepromazine reducing the seizure threshold in dogs may be overstated or unfounded, leading to a reevaluation of this risk in veterinary medicine.

Question 10

Two of the four known opioid receptors have the most significant in Veterinary medicine

Accepted Answer

Mu and kappa opioid receptors are the most significant in veterinary medicine due to their roles in pain modulation and analgesic effects.

Question 11

Fentanyl patches should be applied over the shoulder area of dogs and cats because

Accepted Answer

Applying fentanyl patches over the shoulder area reduces the risk of the animal ingesting the patch, which could lead to overdose or other complications.

Question 12

Sedative drugs that are members of the alpha-2 agonists include xylazine and dexmedetomidine. What is the mechanism of action of these drugs at their specific adrenergic receptor?

Accepted Answer

Alpha-2 agonists like xylazine and dexmedetomidine work by stimulating alpha-2 adrenergic receptors in the brain, which leads to a decrease in the release of norepinephrine. This reduction in norepinephrine release results in sedative and analgesic effects.

Question 13

Fentanyl:

Accepted Answer

Fentanyl is significantly more potent than morphine, making choice A incorrect. It is a strong mu agonist, not a weak one, which makes choice C incorrect. Fentanyl is a controlled substance, making choice D incorrect. The correct statement is B, as fentanyl generally has a shorter duration of action compared to morphine, especially when used in clinical settings for pain management.

Question 14

Fentanyl transdermal patches

Accepted Answer

The answer of Fentanyl transdermal patches
...

Question 15

Which of the opioids is considered the standard to which all other opioids are compared in terms of analgesic effects, which are resulting from its primary activity at the µ (mu) receptor?

Accepted Answer

Morphine is considered the standard to which all other opioids are compared in terms of analgesic effects, primarily due to its activity at the µ (mu) receptor.

Question 16

_____________ is the naturally derived opiate drug that is used primarily for its pain alleviating properties.

Accepted Answer

Morphine is a naturally derived opiate from the opium poppy plant, primarily used for pain relief.

Question 17

Of the following, which is a correct when considering topical or transdermal fentanyl delivery to veterinary patients.

Accepted Answer

Fentanyl is a potent opioid, and inadvertent exposure can lead to serious health risks, including respiratory depression, which is why it is considered a medical emergency. Handling fentanyl requires caution, and any exposure, whether oral or through the skin, necessitates immediate medical attention.

Question 18

When a painful injury occurs, it's not just those tissues that are directly damaged that stimulate pain receptors. Over time nearby cells become excessively sensitized and therefore are easily stimulated to detect pain. The resulting throbbing pain found areas near an injury are because of tissue ______________.

Accepted Answer

Hyperalgesia refers to an increased sensitivity to pain, which can occur in areas surrounding an injury. This condition leads to pain being felt more intensely in the affected regions, explaining the throbbing pain near an injury site.

Question 19

Modulation in the pain pathway is

Accepted Answer

Modulation in the pain pathway refers to the process of altering the transmission of pain signals, which occurs in the spinal cord before the signals are sent to the brain.

Question 20

Opioids are classified as mixed agonist/antagonists meaning

Accepted Answer

Mixed agonist/antagonists opioids interact with opioid receptors in different ways, providing analgesia through agonist activity at one type of receptor while simultaneously blocking or having less effect at another receptor type, leading to a mixed pharmacological profile.

Quiz 8: Drugs Affecting the Nervous System: Analgesics, Tranquilizers, Sedatives, and Anesthetics