Opioid dispensing after Cesarean delivery in British Columbia: a historical cohort analysis from 2004 to 2019.

Purpose: To describe postdischarge opioid dispensing after Cesarean delivery (CD) in 49 hospitals in British Columbia (BC) and assess opportunities for opioid stewardship.

Methods: Using the BC Ministry of Health's Hospital Discharge Abstract Database, we linked 135,725 CDs performed in 2004-2016 and 30,919 CDs performed in 2017-2019 (length of stay ≤ four days) by deidentified Personal Health Numbers to data on medications dispensed from all BC community pharmacies (PharmaNet). We excluded patients with cancer and those to whom opioids have been dispensed in the year before.

Halide-free neodymium phosphate based catalyst for highly -1,4 selective polymerization of dienes.

Neodymium-based Ziegler-Natta type catalytic systems are known to produce polydienes with high -1,4 content. It is generally believed that in Ziegler-Natta catalytic systems, a halide or pseudohalide, whether in the catalyst itself or a separate source, is required for the success of the polymerization. In this work, we have synthesized an unusual halide-free neodymium diethyl phosphate catalyst for diene polymerization.