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Early Clinical Development High Resolution PK/PD in Phase I to Guide Subsequent Development: Experience with Remifentanil Steven L. Shafer, M.D. Palo Alto VA Health Care System Stanford University School of Medicine
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Lecture Goals l Explain opioid concentration/effect relationships l Explain EEG measures of opioid drug effect l Introduce opioid “fingerprint” using EEG as a surrogate measure of drug effect l Explain how the EEG established remifentanil therapeutic windows in Phase I l Demonstrate how Phase I PK/PD affected Phase II and III study design and drug labeling
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Acknowledgements l Donald Stanski, M.D. (Stanford) l Keith Muir, Ph.D. (Glaxo) l Robert Powell, M.D. (Glaxo) l Talmage Egan, M.D. (Stanford) l Charles Minto, M.D. (Stanford) l Thomas Schinder, M.D. (Stanford) l Dan Spyker, M.D. (FDA)
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Alfentanil Clinical Concentration vs Response Ausems ME, Hug CC, Stanski DR, Burm AGL: Anesthesiology 65:362-373, 1986
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Alfentanil Concentration- Response Relationships Egan, et al. The role of the EEG in Remifentanil Development.
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Opioid Therapeutic Ranges Billard V, Shafer SL. Control and Automation in Anesthesia. 1995, Springer
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Awake EEG Gregg K, Varvel JR, Shafer SL. J Pharmacokinet Biopharm 20, 611-635, 1992
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Profound Opioid EEG Effect Gregg K, Varvel JR, Shafer SL. J Pharmacokinet Biopharm 20, 611-635, 1992
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EEG Time Course with Fentanyl Scott J, Ponganis KV, Stanski DR. Anesthesiology 62:234-241, 1985
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EEG Time Course with Alfentanil Scott J, Ponganis KV, Stanski DR. Anesthesiology 62:234-241, 1985
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Fentanyl, Alfentanil, Sufentanil EEG Billard V, Shafer SL. Control and Automation in Anesthesia. 1995, Springer
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EEG Response as a fraction of IC 50 Billard V, Shafer SL. Control and Automation in Anesthesia. 1995, Springer
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EEG vs Therapeutic Ranges Billard V, Shafer SL. Control and Automation in Anesthesia. 1995, Springer
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EEG vs Opioid Therapeutic Ranges Billard V, Shafer SL. Control and Automation in Anesthesia. 1995, Springer
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EEG Time Course with Remifentanil Egan, et al. Anesthesiology 84:881-833, 1996
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Fentanyl Congener EEG Pharmacodynamic Parameters Egan, et al. The role of the EEG in Remifentanil Development.
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Remifentanil Therapeutic Ranges
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Remifentanil Dosing Based on Phase I PK/PD
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Remifentanil Time Course Egan, et al. The role of the EEG in Remifentanil Development.
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Relative Therapeutic Windows Egan, et al. The role of the EEG in Remifentanil Development.
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Opioid Fingerprint, 1997 Egan, et al. The role of the EEG in Remifentanil Development.
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Remifentanil Fingerprint Egan, et al. The role of the EEG in Remifentanil Development.
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