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Flashcards in Surgery Pharm Pain Management Deck (44)
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Goal of perioperative pain management

Goal of perioperative pain management is to have the patient comfortable when they awaken from anesthesia


Undertreated Perioperative pain Adverse Outcomes?

1. Thromboembolic complications
2. Pulmonary complications
3. Increase length of hospitalization
4. Hospital readmission for further pain management
5. Needless suffering
6. Impairment of quality of life
7. Development of chronic pain


Adverse Outcomes of Perioperative Pain Management

1. Respiratory depression
2. Brain injury
3. Neurologic injury
4. Sedation
5. Circulatory depression
6. Nausea and vomiting
7. Pruritus
8. Urinary retention
9. Impairment of bowel function
10. Sleep disruption


Perioperative pain management:
Must always document? 3

1. Pain intensity
2. The effects of pain therapy
3. Side effects caused by the therapy


Approach to the patient: factors to consider

1. Type of surgery

2. Expected severity of postoperative pain

3. Underlying medical conditions- CVD, Pulomonary, allergies, renal or liver failure

4. Risk-benefit ratio for the available techniques

5. Patient’s preferences

6. Patient’s previous experience with pain


Preoperative preparation of the patient

1. History
2. Physical
3. Post operative pain control plan


Prepare the patient
1. Adjust or continue meds that may provoke what?
2. Examples?

3. Treatment to reduce what?
-Consider initiation of post operative pain management

4. Premedications before surgery?

5. Patient and family education
-Needs to include? 3

1. a withdrawal syndrome


3. preexisting pain and anxiety


-Adverse effects of meds
-Optimal use of patient-controlled analgesia


Perioperative techniques for pain management

1. Central regional opioid analgesia
2. Patient controlled analgesia with systemic opioids
3. Peripheral regional analgesia


Perioperative techniques for pain management: Peripheral regional analgesia? 3

1. Intercostal blocks
2. Plexus blocks
3. Local anesthetic infiltration of incisions


Central regional opioid analgesia
1. Epidural is what?
2. Intrathecal administration of analgesia is what?

3. Benefit?

4. Risks? 2

1. Epidural – injection outside the dura
2. Intrathecal aka spinal anesthesia – injection through the dura directly into the CSF

3. Improved pain relief when preincisional epidural or intrathecal morphine is administered compared with po, IV or IM morphine

-Increased pruritus and
-urinary retention in post operative epidural anesthesia compared to IM morphine


Intrathecal administration of opioids
1. Intrathecal: What drugs are used? 2

1. morphine (0.1 to 0.2 mg) or fentanyl (10 to 20 mcg)


Intrathecal administration of opioids
1. A single dose of intrathecal opioid (morphine) can provide pain relief for up to _______ hours post operatively.

2. Onset of action?

3. Fentanyl provides pain relief for how long?
4. Onset of action?

1. 18-24

2. 45 minutes

3. 1 to 2 hours

4. 5-10 minutes


Patient controlled analgesia
1. Used for?
2. Benefits? 2
3. Used for how long?
4. Which drugs can be given this way? 3
5. Fentanyl is less desirable due to what?
-May be useful if what? 2

1. For moderate to severe post op pain

2. Benefits
-Decreased delay in pt access to pain medication
-Decreased likelihood of overdose

3. Pump usually discontinued when able to take oral meds

-hydromorphone and
-fentanyl can be given via PCA

5. Short DOA
-morphine allergy,
-easier to use in hepatic or renal insufficiency than others


1. Multimodal techniques for pain management is what?

2. Systemic meds used? 2

3. Central and regional meds used? 2

4. Advantage of Central or regional meds?
-More of which SE? 2

1. Using 2 or more drugs that act by different mechanisms for providing analgesia

2. Systemic medications: Opioids + NSAIDs

-Central and regional meds: epidural + local anesthetics (Ex: fentanyl + bupivocaine administered via epidural)

4. Better pain control
-but more muscle weakness and pruritus noted


Systemic analgesics
-Improved pain scores and reduced analgesic use when given IV morphine + what compared to IV morphine alone?



Systemic analgesics
1. What is more effective at decreasing pain vs. COX-2 or nonselective NSAIDs ?

2. Lower pain scores when adding what to IV opioids? 2

3. Unless contraindicated patients should receive scheduled regimen of what? 3

1. Ketorolac along with the PCA opioid administration

2. gabapentin or pregabalin

-COXIBs or


Peripheral regional techniques
1. What are they? 3

2. Preoperative nerve blocks are effective at reducing what? 2

3. Preoperative infiltration of the incision with local anesthetic decreases what?

-Peripheral nerve blocks,
-intraarticular blocks, and
-infiltration of the incisions

-post operative pain and
-decrease the need for opioid use (post operative blocks are not as helpful)

3.decreases post operative pain scores
- (ex. Bupivicaine)


Patients at risk for inadequate pain control

1. Pediatrics
2. Geriatrics
3. Critically ill
4. Cognitively impaired
5. Others who may have difficulty communicating


What is the role of the PA in the management of the post surgical pt?

1. Know the patient’s history

2. Procedure performed and any complications

3. Type of anesthesia used for the case

4. Duration of the case and if that is normal for the procedure mentioned

5. What has the pt received so far, did it work, any adverse reactions and what other modalities are in play? (Epidural pain management, nerve block, etc)

6. Adjustment of opioid dose and/or initiation of acetaminophen, NSAIDs or gabapentin may be needed


Most widely used medication for the treatment of postoperative pain?



Opiod drugs are?
(3 most commonly used for post op IV pain management?)

1. Morphine
2. Hydromorphone (Dilaudid)
3. Fentanyl
Three most common

4. Meperidine


1. Bolus injections are often used
-Given this way they fail to provide what?

2. Continuous infusions: Risks? 2

1. a steady state of the drug

-May be dangerous due to the potential for drug build up and cause respiratory depression
-Must be given in a highly supervised environment


Opioid metabolism
1. All opioids are metabolized how?
-to what?
-Eliminated how?

2. Patients with severe liver disease will need what?

1. hepatically metabolized
-to active and inactive metabolites which
-are eliminated in the urine

2. dosage adjustments


1._______ opioid

2. Onset of analgesia is what?

3. Peak when?

4. Elimination half life is what?

5. Analgesic duration of action is what?

6. IV ____ mg
7. Q ______ until pain relief or
-adverse effects like what occur? 4

1. Prototypical

2. rapid

3. 1-2 hours

4. 2-3 hours

5. 4-5 hours

6. 1-3
7. 5min
-respiratory depression and


1. Active metabolites eliminated where?

2. In renal insufficiency the active metabolites may accumulate and cause what?
-This may manifest how? 4

3. Relatively contraindicated in what?

4. Describe its absorption?

1. renally

2. neurotoxicities

3. severe renal disease

4. Erratic absorption from the GI tract


Hydromorphone (Dilaudid)
1. More rapid onset of analgesia reaching peak within ____ min?

2. Half life ____ hours

3. Approximately _____ times more potent than morphine

4. Dosing?

1. 30

2. 2.4

3. 4-6

4. 0.2-1 mg q 2-3 hours


1. Synthetic derivative of what?

2. Approximately ____ times more potent than morphine

3. More ______ soluble than morphine

4. Onset of action?

5. Improved penetration of the what?

6. Half life?

7. Elimination half life is what?

8. Does not release histamine and may be preferred in the presence of what? 2

1. morphine

2. 100

3. lipid

4. More rapid onset of action than morphine

5. blood-brain barrier

6. Shorter half life

7. 2-4 hours

-hemodynamic instability or


1. Moderate pain dosing?
2. Mderate to severe pain dosing?
3. IV infusion for pain control in mechanically ventilated pts?

4. Administration > 5 days may lead to what?

1. Moderate pain: 25-50 mcg IV Q 5 min up to a max dose

2. Moderate to severe pain 50-100 mcg Q 2-5 min until pain relief

3. IV infusion for pain control in mechanically ventilated patients
-0.7-10 mcg/kg/hr

4. deposition of the drug in adipose tissue and prolonged sedation


1. Indicated for what?
2. Contraindicated in patients on what?

3. Lowers what?

4. Has a ________ effect

5. Downsides? 2

6. Not used for PCA pumps because of the risk for what?

1. the short term management of acute pain

2. MAOIs

3. seizure threshold

4. dysphoric

-Not as effective as other drugs
-Slower rate of metabolism in the elderly or if liver or renal failure

6. accumulation of the active metabolite


Opioid side effects

1. Somnolence
2. Depression of brainstem control of respiratory drive
3. Hypotension
4. Urinary retention
5. N/V
6. Slowing of GI transit
-Constipation, ileus
7. Histamine release (most common after morphine)