Patient-Controlled Analgesia (PCA)
http://www.spineuniverse.com/treatment/pain/tk_071200pain_pca.html
http://www.anes.med.umich.edu/tcpublic/pain/pca.htm
http://www.nursing.uiowa.edu/sites/PedsPain/Routes/PCAnonte.htm
http://www.vh.org/Patients/IHB/Ortho/PCA.html
http://www.umanitoba.ca/womens_health/painpca.htm
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