Dose of morphine in sickle cell crisis
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morphine dosing sickle cell vaso-occlusive crisis
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I now have comprehensive data from three major emergency medicine/pediatrics textbooks. Here is the full answer:
Morphine Dosing in Sickle Cell Vaso-Occlusive Crisis
Adults (>50 kg)
| Route | Drug | Dose | Frequency |
|---|---|---|---|
| IV | Morphine sulfate | 5-10 mg | Every 2-4 hours |
| PO | Morphine sulfate | 20-30 mg | As needed |
| IV | Hydromorphone (alternative) | 1-2 mg (or 1.5 mg) | Every 3-4 hours |
| PO | Hydromorphone (alternative) | 2-4 mg | As needed |
- Reassess response in 15-30 minutes after the initial IV dose; may repeat one-quarter to one-half of the initial dose if pain is not controlled.
- At 4-6 hours, re-evaluate adequacy of pain control.
- Prior to discharge, give a 40 mg oral morphine sulfate dose (or equivalent) 1-2 hours before leaving.
Children (<50 kg)
| Route | Drug | Dose | Frequency |
|---|---|---|---|
| IV | Morphine sulfate | 0.1-0.15 mg/kg | Every 2-4 hours |
| IV | Hydromorphone (alternative) | 0.015-0.020 mg/kg | Every 3-4 hours |
General Pain Stratification (Harriet Lane / Pediatric guidance)
- Mild-moderate pain: NSAIDs (avoid if renal dysfunction) or oral opioids (oxycodone, morphine, hydrocodone)
- Moderate-severe pain (ED/inpatient): IV opioids - morphine or hydromorphone as first-line; use fentanyl instead if renal or hepatic dysfunction is present
- Patient-Controlled Analgesia (PCA): Recommended for inpatients; provide as-needed doses for breakthrough pain, or schedule fixed dosing if PCA is not used
Adjuncts & Special Considerations
- Ketamine (low-dose): Sub-anesthetic IV infusion can be used as an opioid-sparing adjunct; may reduce opioid requirements, time to pain control, and pain scores - particularly useful for poor opioid response
- NSAIDs: Probable additive benefit; individualize based on renal function
- Avoid meperidine - not recommended due to normeperidine accumulation and seizure risk
- Fentanyl preferred over morphine in renal or hepatic impairment (no active metabolite accumulation)
- Oxygen is NOT routinely required unless SpO2 <92%
- IV fluids only if dehydrated; no benefit in euvolemic patients
- Incentive spirometry to reduce risk of acute chest syndrome
Disposition Pointers
Admit if pain is not controlled, or if acute chest syndrome, sepsis, stroke, splenic sequestration, or other complications are present.
Sources:
- Tintinalli's Emergency Medicine: A Comprehensive Study, Table 236-2
- Rosen's Emergency Medicine: Concepts and Clinical Practice, Management section
- The Harriet Lane Handbook (23rd ed.), Table 14.5 - Sickle Cell Disease Complications
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