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Using Opioids in the Hospitalized Patient






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Using Opioids in the Hospitalized Patient. Nicole Artz, MD Assistant Professor of Medicine University of Chicago. No financial relationships to disclose. Outline. Rapid titration for rapid pain relief Dosing the PCA Converting between drug and route Special Populations
Using Opioids in the Hospitalized Patient

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Slide 1

Using Opioids in the Hospitalized Patient

Nicole Artz, MD

Assistant Professor of Medicine

University of Chicago

No financial relationships to disclose

Slide 2

Outline

  • Rapid titration for rapid pain relief

  • Dosing the PCA

  • Converting between drug and route

  • Special Populations

    • Renal/Liver Disease

    • Opioid Tolerant/Dependent

  • Handling Side Effects

  • What’s New

Slide 3

Mr. P

  • 45 y/o man (100 kg) presenting to the ED with acute rib fracture after falling off a ladder.

  • Pain 9/10

  • Takes HCTZ for HTN; no other meds.

  • You are evaluating him in the ED

Slide 4

Mr. P

  • What pain medication will you offer?

  • What dose will you order?

Slide 5

Equianalgesic Opioid Table

*For severe pain start with dose in chart. For moderate pain, start with 50% of dose and start with 25% of dose for mild pain. Start even lower in patients who are elderly, have renal or hepatic disease or weigh < 50 kg

American Pain Society;

Slide 6

Mr. P

  • You order 5 mg IV Morphine

  • 15 minutes later Mr. P is still in 8/10 pain

  • Can you redose yet?

  • How much should you give?

Slide 7

Sedation Scale

*McCaffery, M. and Pasero, CL. Pain: Clinical Manual, 2nd ed.

Slide 8

General Principles for Rapid Titration

  • Redose with 50% of loading dose until adequate relief is achieved (usually <5/10)*

  • American Pain Society. Fifth edition

  • National Comprehensive Cancer Network, v.2.2005

  • *Variation exists among different guidelines.

Slide 9

Mr. P

  • You redose with 2.5 mg of Morphine and reassess 15 minutes later.

  • Mr. P reports his pain is now 6/10

  • You redose with an additional 2.5 mg

  • 15 minutes later Mr. P is comfortable with a pain score of 3-4/10.

Slide 10

Mr. P (Scenario 1)

  • What should his standing dose of Morphine be and at what interval?

  • 10 mg Morphine IV Q3 hrs ATC

  • You reassess later that day and he reports adequate pain control immediately after the 10 mg dose but states the dose wears off after the first 90 minutes.

Slide 11

Options?

  • Consider changing to PCA

    • Avoids peaks and valleys in pain control from bolus dosing

    • Increases patient self-efficacy

    • Less burdensome for nurses

    • Safe way to achieve excellent pain control

Joshi and White, 1998; Ballantyne, 1993; Kerr, et al. 1988

Slide 12

Mr. P (Scenario 1)

  • How will you dose the PCA?

Slide 13

General Principles

  • Avoid using a basal rate in an opioid naive patient until opioid requirements are known

  • To calculate an initial demand dose- use 30-50% of the effective bolus dose. *Goal is only 1-2 demands/hour needed to keep pain under control.

  • Titrate the demand dose to achieve good pain control

  • May add a basal once opioid requirements determined.

Slide 14

Mr. P (Scenario 1 Cont..)

  • Morphine PCA 3 mg demand dose

  • 15 minute lockout

  • No basal rate

Slide 15

Mr. P Scenario 1 cont…

  • Day 2- pain is well controlled with Morphine PCA 3 mg demand with 15 minute lockout.

  • Reports trouble sleeping due to pain

  • Solution?

    • Add a basal infusion on the PCA

Slide 16

Mr. P (Scenario 1 cont…)

  • 24 hour use = 120 mg IV Morphine

  • If still in severe pain could give full amount as basal

  • If pain improved but trouble sleeping, consider starting 30-50% 24 hr total as basal

Slide 17

Mr. P (Scenario 1 Cont…)

  • New PCA orders

  • 60 mg/24 hrs = 2.5 mg/hr continuous infusion

  • Demand dose?

    • 50-150% of basal

  • 2.5 mg demand with 15 minute lockout

Slide 18

Mr. P (Scenario 1)

  • Converting to orals for discharge

    • Take 24 hr PCA requirements

    • Give 50-100% as equianalgesic dose of oral long-acting opioid

    • Rescue with short-acting that is 10-15% of 24 hr dose.

Slide 19

Mr. P (Scenario 1)

  • Pt used 90 mg IV Morphine past 24 hrs and currently has excellent pain control.

  • 90 mg IV Morphine = 10 IV Morphine

    X mg po Morphine 30 mg po Morphine

    X = 270 mg po Morphine/day

Slide 20

Mr. P (Scenario 1)

  • Start 50% as long-acting

    • 270÷2 = 135 mg long-acting Morphine

    • 135÷3 = 45 mg MS ER po Q 8 hrs

  • Calculate a breakthrough dose

    • 10-15% of total daily dose

    • Morphine Sulfate IR 15 mg po Q 2-4 hrs prn breakthrough pain

Slide 21

Mr. P (Scenario 1)

  • How will you wean the morphine?

    • Need to wean if >=5 days exposure

    • 10-20% per day- more slowly if increased pain or signs of withdrawal

Slide 22

Mr. P (Scenario 2)

  • Pt just admitted from the ED

  • You reassess later that day and he reports worsening pain with relief only to 7/10 after each 10 mg IV morphine.

  • A PCA is not available.

  • While evaluating causes for increased pain, how will you titrate the dose to achieve better control?

Slide 23

Mr. P (Scenario 2 Cont…)

  • Severe Pain (7-10)- Increase by 100%

  • Moderate Pain (4-6)- Increase by 50%

  • Mild Pain (0-3)- Increase by 25%

Slide 24

Mr. P (Scenario 2)

  • New Morphine dose = 15 mg IV Q 3hrs OR 20 mg IV Q 3hrs

  • Avoid writing a range for dose or interval

  • Consider dosing ATC patient may refuse instead of prn

Slide 25

Renal/Liver Insufficiency

  • Start with Lower Dose, Longer Interval

    • Avoid Meperidine (even for pts w/o renal insuff)

    • Avoid scheduled doses of Morphine in renal insufficiency

    • Preferred opioids in renal insufficiency: Fentanyl, Hydromorphone, Methadone

Slide 26

The Opioid Tolerant Patient

  • What is tolerance?

  • What is physical dependence?

  • Difference between physical dependence and psychological dependence/(addiction)?

Slide 27

Mrs. G

  • 60 y/o woman with metastatic breast cancer admitted with intractable pain

  • Home regimen:

    • Two 100 mcg Fentanyl patches

    • Hydromorphone 12 mg po Q 3 hrs prn breakthrough pain

    • Reports severe nausea with morphine

Slide 28

Mrs. G

  • Calculate a basal rate for a Hydromorphone PCA

    • Convert Fentanyl to Morphine using 1:2 ratio

    • 200 mcg Fentanyl patch equiv to 400 mg po Morphine/day

    • 400 mg po Morphine/day = 30

      X mg IV Hydromorphone/day 1.5

      X = 20 mg IV Hydromorphone/day

    • Consider reducing dose by 25%-50% due to incomplete cross-tolerance

Slide 29

Mrs. G

  • Add in breakthrough pain medication

    • Hydromorphone 12 mg Q 3 hrs = 96 mg/day po Hydromorphone

    • 96 mg po hydromorphone/day = 7.5

      X mg IV hydromorphone/day 1.5

      X = 19 mg IV Hydromorphone/day

      20 mg + 19 mg = 39 mg IV Hydromorphone/24 hrs

Slide 30

Mrs. G cont..

  • Given intractable pain, would give total amount as basal and add demand dose

    • 39mg/24hrs = 1.6 mg/hr basal infusion

    • Demand dose?

      • 50-150% of basal

    • 1.5 mg demand available every 10 minutes

      * In addition to this, you add ketoralac and Dexamethasone

Slide 31

Mrs. G

  • Later that day, the patient is more comfortable, with pain 5/10 and decreased to 3/10 after using the demand dose on PCA.

  • Reports no bowel movement for 2 weeks at home and increased abd bloating;

  • Abd series reveals constipation but no obstruction

Slide 32

Opioid Side Effects

  • Nausea

    • Metoclopramide, haloperidol, prochlorperazine

  • Constipation

    • Prophylactic bowel regimen with stimulants (Senokot, Bisacodyl)

  • Pruritis

    • Diphenhydramine,

  • Sedation

    • Decrease opioid dose, caffeine, methylphenidate

  • Dysphoria,Visual/tactile hallucinations, Delirium

    • Adjust dose or change opioid; haloperidol

  • Myoclonus

    • Adjust dose or change opioid

  • Allodynia/Hyperalgesia

    • Wean opioid, change opioids

Slide 33

What’s new…

  • Methylnaltrexone

  • Peripheral opioid receptor antagonist

  • Does not cross the blood-brain barrier

  • Effective for treatment of opioid induced constipation and nausea

  • Subcutaneously administered

  • Recently approved by the FDA for treatment of opioid-induced constipation in palliative care pts with inadequate response to laxatives.

Slide 34

Take Home Points

  • Rapid Titration:

    • reassess every 15 minutes and redose with 50% of loading dose until adequate relief achieved.

    • Add up total mg required to achieve relief during rapid titration- this is your scheduled bolus dose.

  • Titrate opioids by 25%, 50%, or 100% for mild, moderate, or severe pain

  • When transitioning to po make sure to calculate an equianalgesic dose using the opioid conversion tables.

Slide 35

Take Home Points

  • Use PCA’s when available

    • In opioid naive- set demand at 30-50% of loading or bolus dose

    • In opioid tolerant- convert current opioids to equianalgesic basal rate on pca; set starting demand dose the same as the basal rate

Slide 36

References

  • Principles of Analgesic Use in the Treatment of Acute Pain and Cancer Pain, American Pain Society, Fifth edition, 2003.

  • Education for Physicians on End-of-Life Care (EPEC), Pain Management Module, RWJF, 1999.

  • National Comprehensive Cancer Network: Practice Guidelines in Oncology- v.2.2005

Slide 37

Resources

  • Hopkins Opioid Program

  • Fast Facts, National Residency End-of-Life Curriculum Project

    Download at www.eperc.mcw.edu


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