The purpose of this study is to determine whether the addition of the superficial parasternal intercostal plane (SPIP) block alone (30cc of 0.25% bupivacaine) or plus Magnesium (200mg of magnesium sulfate) or plus Magnesium + Buprenorphine (300mcg) as adjuvants can improve post-operative pain in patients undergoing cardiothoracic surgery, specifically, coronary artery bypass grafting (CABG)
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Post-operative total opioid consumption (oral morphine equivalents)
Timeframe: 24 hours after the surgery
Visual analog scale (VAS) pain scores
Timeframe: 6 hours after surgery
Visual analog scale (VAS) pain scores
Timeframe: 12 hours after surgery
Visual analog pain (VAS) scores
Timeframe: 24 hours after surgery
Length of hospital stay (LOS)
Timeframe: Up to 1 month