The main purpose of this study is to examine if pain levels treated with intrathecal (IT) preservative-free morphine (PFM) after a cesarean section improve with the additional use of continuous subfascial wound infiltration with ropivacaine using the OnQ® elastomeric pump system.
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Change in Pain Scores During Cough From Baseline
Timeframe: 2 hours post baseline, 6, 12, 24, 48, 72 hours post baseline
Change in Pain Scores During 20°Straight Leg Raise
Timeframe: Baseline (At zero time, the time of the first dosing using the On-Q catheter), 2, 6, 12, 24, 48, 72 hours post baseline
Change in Intensity of Pain: Numerical Pain Scale (NPS) From Baseline
Timeframe: 6 weeks, 3 months
Change in Intensity of Pain: VAPS From Baseline
Timeframe: 24 hours post-intervention, 48 hrs, and 72hr post-intervention.
Change in McGill Pain Questionnaire Score From Baseline
Timeframe: 2 hours post-intervention, 6 hours, 12 hours, 24 hours, 72 hours, 6 weeks, 3 months post-intervention
Change in Pain Scores at Rest From Baseline
Timeframe: 2 hours post-intervention, 6 hours, 12 hours, 24 hours, 48 hous, 72 hours post baseline