What do u mean by inj fentanyl 3 amp + 500ns @3ml/hour
This is a standard ICU/ward analgesic infusion order. Here's what it means:
Inj Fentanyl 3 amp + 500 NS @ 3 ml/hour
Breaking It Down
Components
- Inj Fentanyl 3 amp - Fentanyl injection, 3 ampoules
- Each standard fentanyl ampoule = 100 mcg / 2 ml
- So 3 ampoules = 300 mcg in 6 ml
- 500 NS = 500 ml of Normal Saline (0.9% NaCl) as the diluent
Preparation
| Step | Detail |
|---|---|
| Fentanyl | 3 ampoules = 300 mcg (6 ml) |
| Added to | 500 ml Normal Saline |
| Total volume | ~506 ml (≈ 500 ml for practical purposes) |
| Final concentration | 300 mcg / 500 ml = 0.6 mcg/ml |
Infusion Rate
- Running at 3 ml/hour
- Dose delivered = 3 ml/hr × 0.6 mcg/ml = 1.8 mcg/hour
Clinical Context
- This is a very low-dose continuous fentanyl infusion, typically used for:
- Background analgesia in post-operative patients
- Palliative/comfort care
- Patients who cannot tolerate oral analgesia
- The dose (1.8 mcg/hr) is well below typical analgesic doses (25-100 mcg/hr in opioid-naive adults), suggesting this may be a starting/titration dose or used in an opioid-sensitive patient (elderly, renal impairment, low weight)
Key Points to Remember
- Always verify ampoule strength at your institution (some facilities use 50 mcg/ml ampoules)
- Monitor for respiratory depression, sedation, hypotension
- Have naloxone (opioid antagonist) readily available
- Infusion rate can be titrated up based on pain scores and patient response
Note: Ampoule concentrations can vary by country/formulary. Always confirm the local ampoule strength before calculating the dose.
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