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DEVELOPMENT OF A PATIENT-CONTROLLED ANALGESIC MIXTURE FOR POSTOPERATIVE PAIN CONTROL
European Statement
Production and Compounding
Author(s)
María Molinero, Virginia Puebla, Cristina González, Lidia Ybáñez, Gonzalo Hernando, Natalia Sánchez-Ocaña, Javier Corazón, María de la Torre, Jose Manuel Martínez
Why was it done?
This technique provides autonomy to the patient allowing to adjust the dose based on the intensity of pain. It has been demonstrated that small on-demand doses of analgesia provide a reduction in the final dose, thus reducing side effects. In addition, by minimizing the possible delay in the administration of analgesia, the anxiety associated with pain and exacerbations is reduced.
What was done?
Hospital Pharmacy Service in collaboration with Acute Pain Unit has developed a protocol for an analgesic mixture for intravenous administration in continuous infusion based on tramadol, dexketoprofen and haloperidol. It is a patient-controlled analgesia (PCA) administered by pump for the treatment of acute postoperative pain.
How was it done?
We performed a bibliographic search of stability studies in order to standardize the analgesic mixture, guaranteeing its physical-chemical and microbiological stability.
What has been achieved?
A mixture of 600mg tramadol, 300mg dexketoprofen and 5mg haloperidol was prepared and it was filtered through a 5-micron filter. It was diluted in 100mL of 0.9% sodium chloride, obtaining a mixture of 125mL. It was sealed and bagged in a photoprotective bag. After the bibliographic search on stability data and physical-chemical compatibility of the mixture, a stability of 14 days at 2-8 ºC was established. Once elaborated, quality control was performed by gravimetry. It was dispensed weekly by stock to the post-anesthesia resuscitation unit. The established perfusion rate is 1.3 mL/h or 1.7 mL/h for 48h. With each rescue, 8mg of tramadol and 4mg of dexketoprofen are released per hour or 4mg and 2mg every 30min, respectively. The maximum dose that can be administered is 400mg tramadol, 150mg dexketoprofen and 2mg haloperidol, except if the patient weighs less than 50kg: 8mg/kg tramadol. If renal insufficiency, dose adjustment was mandatory.
What next?
The centralization of the preparation of intravenous admixtures from the pharmacy service allow us to adjust the expiry date based on stability studies reported in the literature, to maintain the asepsis of the mixture as it is prepared in horizontal laminar flow cabinets, to increase the safety and to secure the traceability.