What is the drop rate per minute for an injectable Dobutamine infusion prepared by adding 250 mg of Dobutamine to 500 mL of 5% dextrose (where 1 mL equals 20 drops) for patients weighing from 5 kg to 80 kg?

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Dobutamine Infusion Drop Rate Table

For a solution of 250 mg dobutamine in 500 mL 5% dextrose (concentration = 500 mcg/mL) with 20 drops/mL, use the following drop rates per minute based on patient weight:

Calculation Method

The concentration is 500 mcg/mL (250 mg ÷ 500 mL). With 20 drops/mL, each drop contains 25 mcg of dobutamine.

Formula: Drop rate (drops/min) = [Dose (mcg/kg/min) × Weight (kg) × 60 min] ÷ 25 mcg/drop

Drop Rate Table (drops per minute)

Weight (kg) 2.5 mcg/kg/min 5 mcg/kg/min 7.5 mcg/kg/min 10 mcg/kg/min 15 mcg/kg/min 20 mcg/kg/min
5 30 60 90 120 180 240
10 60 120 180 240 360 480
15 90 180 270 360 540 720
20 120 240 360 480 720 960
25 150 300 450 600 900 1200
30 180 360 540 720 1080 1440
35 210 420 630 840 1260 1680
40 240 480 720 960 1440 1920
45 270 540 810 1080 1620 2160
50 300 600 900 1200 1800 2400
55 330 660 990 1320 1980 2640
60 360 720 1080 1440 2160 2880
65 390 780 1170 1560 2340 3120
70 420 840 1260 1680 2520 3360
75 450 900 1350 1800 2700 3600
80 480 960 1440 1920 2880 3840

Dosing Guidelines

Start at 0.5-1.0 mcg/kg/min and titrate upward based on clinical response 1. The usual therapeutic range is 2-20 mcg/kg/min 2, 3, 1. Rarely, doses up to 40 mcg/kg/min may be needed 1.

Critical Monitoring Parameters:

  • Systemic blood pressure
  • Heart rate and rhythm (watch for tachyarrhythmias)
  • Urine output
  • Cardiac output when possible
  • Central venous pressure/pulmonary capillary wedge pressure 1

Important Safety Considerations:

  • Ensure secure IV access - extravasation causes severe tissue injury 2, 3
  • Monitor for tachycardia, arrhythmias, hypertension, and metabolic changes (hyperglycemia, hypokalemia) 2
  • Use within 24 hours of preparation 1
  • Do not mix with alkaline solutions or sodium bicarbonate 1

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.