Question

'I TELCEL 3:25 PM 47% 1:34:04 Exit 10. Aminophylline loading dose of 5.6 mg/kg to infuse over 30 minutes for a patient weighing 50 kg followed by 0.6 mg/kg/hr maintenance dose for COPD Supply: Aminophylline 500 mg in 500 mL of D5W How many milliliters per hour will you set the IV pump for the loading dose? How many milliliters per hour will you set the IV pump for the maintenance dose? Enter answer...

Answer 1

ANSWER.

   * Calculation of ml/hr set the IV pump for loading dose.

            Formula = Volume /Time

            Ordered loading dose = 5.6 mg/kg.

               Patient weight = 50kg.

          So

             Dose required for the patient = 5.6 * 50

                                                            = 280 mg.

                 Available dose = 500 mg/500ml

          So

          Volume(ml) of drug required for the patient.

                             Formula = Desired dose / Dose in hand * Quantity

                                  Here

                                      Desired dose = 280 mg.

                                      Dose in hand = 500 mg.

                                           Quantity = 500 ml.

              So

                 Amount (ml) of drug required = 280 / 500 * 500

                                                                 = 0.56 * 500

                                                                 = 280 ml.

                                 Time = 30 min ( 0.5 hr)

                 As per formula

                     ml/hr set in IV for loading dose = Volume / Time

                                                                          = 280 / 0.5

                                                                            = 560 ml/hr.

* Calculation of ml/hr set in the IV pump for maintainance dose.

              Formula = Volume / Time.

          Ordered dose = 0.6 mg/kg/hr.

             Patient weight = 50 kg.

     So

         Dose required for the patient = 0.6 * 50

                                                         = 30 mg / hr.

                                Available dose = 500 mg / 500 ml.

            So

               Volume(ml) of drug required for the patient.

                         Formula = Desired dose / Dose in hand * Quantity.

                               Here

                         Desired dose = 30 mg.

                                     Dose in hand = 500 mg.

                                          Quantity = 500 ml.

                   So

                          Amount (ml) of drug required = 30 / 500 * 500

                                                                          = 0.06 * 500

                                                                          = 30 ml.

                                                  Time = 1 hr.

         As per formula

              ml/hr set in the IV pump for maintainance dose = Volume/ Time.

                                                                       = 30 /1

                                                                       = 30 ml/hr.