Opioid Use and Misuse in Pregnancy

Perturbed neurochemical and microstructural organization in a mouse model of prenatal opioid exposure: A multi-modal magnetic resonance study

Methadone-based treatment for pregnant women with opioid use disorder is quite prevalent in the clinical environment. A number of clinical and animal model-based studies have reported cognitive deficits in infants prenatally exposed to methadone-based opioid treatments. However, the long-term impact of prenatal opioid exposure (POE) on pathophysiological mechanisms that govern neurodevelopmental impairment is not well understood. Using a translationally relevant mouse model of prenatal methadone exposure (PME), the aim of this study is to investigate the role of cerebral biochemistry and its possible association with regional microstructural organization in PME offspring. To understand these effects, 8-week-old male offspring with PME (n = 7) and prenatal saline exposure (PSE) (n = 7) were scanned in vivo on 9.4 Tesla small animal scanner. Single voxel proton magnetic resonance spectroscopy (1H-MRS) was performed in the right dorsal striatum (RDS) region using a short echo time (TE) Stimulated Echo Acquisition Method (STEAM) sequence. Neurometabolite spectra from the RDS was first corrected for tissue T1 relaxation and then absolute quantification was performed using the unsuppressed water spectra. High-resolution in vivo diffusion MRI (dMRI) for region of interest (ROI) based microstructural quantification was also performed using a multi-shell dMRI sequence. Cerebral microstructure was characterized using diffusion tensor imaging (DTI) and Bingham-neurite orientation dispersion and density imaging (Bingham-NODDI). MRS results in the RDS showed significant decrease in N-acetyl aspartate (NAA), taurine (tau), glutathione (GSH), total creatine (tCr) and glutamate (Glu) concentration levels in PME, compared to PSE group. In the same RDS region, mean orientation dispersion index (ODI) and intracellular volume fraction (VFIC) demonstrated positive associations with tCr in PME group. ODI also exhibited significant positive association with Glu levels in PME offspring. Significant reduction in major neurotransmitter metabolites and energy metabolism along with strong association between the neurometabolites and perturbed regional microstructural complexity suggest a possible impaired neuroadaptation trajectory in PME offspring which could be persistent even into late adolescence and early adulthood.

Perturbed neurochemical and microstructural organization in a mouse model of prenatal opioid exposure: a multi-modal magnetic resonance study

Methadone-based treatment for pregnant women with opioid use disorder is quite prevalent in the clinical environment. A number of clinical and animal model-based studies have reported cognitive deficits in infants prenatally exposed to methadone-based opioid treatments. However, the long-term impact of prenatal opioid exposure (POE) on pathophysiological mechanisms that govern neurodevelopmental impairment is not well understood. Using a translationally relevant mouse model of prenatal methadone exposure (PME), the aim of this study is to investigate the role of cerebral biochemistry and its possible association with regional microstructural organization in PME offspring. To understand these effects, 8- week-old male offspring with PME (n=7) and prenatal saline exposure (PSE) (n=7) were scanned in vivo on 9.4 Tesla small animal scanner. Single voxel proton magnetic resonance spectroscopy ( 1 H-MRS) was performed in the right dorsal striatum (RDS) region using a short echo time (TE) Stimulated Echo Acquisition Method (STEAM) sequence. Neurometabolite spectra from the RDS was first corrected for tissue T1 relaxation and then absolute quantification was performed using the unsuppressed water spectra. High-resolution in vivo diffusion MRI (dMRI) for region of interest (ROI) based microstructural quantification was also performed using a multi-shell dMRI sequence. Cerebral microstructure was characterized using diffusion tensor imaging (DTI) and Bingham-neurite orientation dispersion and density imaging (Bingham-NODDI). MRS results in the RDS showed significant decrease in N-acetyl aspartate (NAA), taurine (tau), glutathione (GSH), total creatine (tCr) and glutamate (Glu) concentration levels in PME, compared to PSE group. In the same RDS region, mean orientation dispersion index (ODI) and intracellular volume fraction (VF IC ) demonstrated positive associations with tCr in PME group. ODI also exhibited significant positive association with Glu levels in PME offspring. Significant reduction in major neurotransmitter metabolites and energy metabolism along with strong association between the neurometabolites and perturbed regional microstructural complexity suggest a possible impaired neuroadaptation trajectory in PME offspring which could be persistent even into late adolescence and early adulthood.

Pregnancy, Opioid Use Disorder and COVID-19: An Evaluation of Acute Care Presentations During a Pandemic

INTRODUCTION

The opioid epidemic has been exacerbated by the COVID-19 pandemic, resulting in increased acute care opioid-related and overdose visits. We sought to assess how the pandemic may have impacted an obstetric cohort impacted by opioid misuse in the acute care context.

METHODS

A retrospective review of acute care presentations of patients with concomitant pregnancy (Z33.1) and opioid-related diagnostic codes (T10 codes and/or F11) was conducted over a 24-month period (pre-COVID = March 2019 through February 2020, post-COVID = March 2020 through February 2021). Descriptive statistics and χ2 analysis of pre- versus post-COVID presentations were performed.

RESULTS

A total of 193 individuals, 104 (53.9%) pre- and 89 (46.1%) post-COVID, accounting for 292 total encounters, 160 (54.8%) pre- and 132 (45.2%) post-COVID, were seen for acute care visits (P = 0.84). Age (P = 0.15), race (P = 0.59), and insurance status (P = 0.17) were similar pre- versus post-COVID. The majority of presentations, pre- (40.4%) and post-COVID (44.9%), were for opioid withdrawal (P = 0.74). Although post-COVID individuals were more likely to lack prenatal care (48.3% versus 39.4% pre-COVID), this trend was not significant (P = 0.19). Similar proportions of individuals were affected by pregnancy complications (51.9% pre-, 44.9% post-COVID; P = 0.30). Similar proportions of individuals were affected by adverse pregnancy outcomes (44.2% pre-, 48.3% post-COVID; P = 0.64).

CONCLUSION

The COVID-19 pandemic did not have a statistically significant effect on opioid-related acute care presentations or outcomes for obstetric patients. In this acute care cohort, however, opioid misuse had significant general impact on pregnancy complications and outcomes, suggesting unmet needs in this population.

Cesarean delivery using an ERAS-CD process for nonopioid anesthesia and analgesia drug/medication management

Cesarean delivery (CD) is a surgical delivery of a neonate with surgical access through the maternal abdominal and uterine structures. The Enhanced Recovery After Surgery (ERAS) protocol is a standardized perioperative care program and surgery quality improvement process that has had global spread across numerous surgical disciplines. The medical and surgical use of opioids for pain management and the nonmedical opioid use, over the last three decades, have significantly increased the prevalence of abuse and addiction to opioids. This review summarizes pain, pregnancy substance use, and ERAS-directed analgesia and anesthesia for opioid use reduction or elimination in the operative and postoperative periods. Enhanced recovery (quality and safety) in the surgical CD context requires collaboration, consensus, and appropriate clinical prioritization to allow for the identification of 'the right patient, in the right clinical situation, with the right informed consent, and the right clinical care team and health system'.