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1.
J Gen Intern Med ; 39(5): 731-738, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38302813

ABSTRACT

BACKGROUND: Experts estimate virtual urgent care programs could replace approximately 20% of current emergency department visits. In the absence of widespread quality guidance to programs or quality reporting from these programs, little is known about the state of virtual urgent care quality monitoring initiatives. OBJECTIVE: We sought to characterize ongoing quality monitoring initiatives among virtual urgent care programs. APPROACH: Semi-structured interviews of virtual health and health system leaders were conducted using a pilot-tested interview guide to assess quality metrics captured related to care effectiveness and equity as well as programs' motivations for and barriers to quality measurement. We classified quality metrics according to the National Quality Forum Telehealth Measurement Framework. We developed a codebook from interview transcripts for qualitative analysis to classify motivations for and barriers to quality measurement. KEY RESULTS: We contacted 13 individuals, and ultimately interviewed eight (response rate, 61.5%), representing eight unique virtual urgent care programs at primarily academic (6/8) and urban institutions (5/8). Most programs used quality metrics related to clinical and operational effectiveness (7/8). Only one program reported measuring a metric related to equity. Limited resources were most commonly cited by participants (6/8) as a barrier to quality monitoring. CONCLUSIONS: We identified variation in quality measurement use and content by virtual urgent care programs. With the rapid growth in this approach to care delivery, more work is needed to identify optimal quality metrics. A standardized approach to quality measurement will be key to identifying variation in care and help focus quality improvement by virtual urgent care programs.


Subject(s)
Telemedicine , Humans , Telemedicine/standards , Telemedicine/methods , Ambulatory Care/standards , Quality of Health Care/standards , Motivation , Quality Indicators, Health Care
2.
Ann Emerg Med ; 80(5): 401-407, 2022 11.
Article in English | MEDLINE | ID: mdl-35940989

ABSTRACT

STUDY OBJECTIVE: Emergency clinician-staffed telehealth programs seek to provide equitable, safe, efficient, effective, and patient-centered care. However, early studies show conflicting evidence on whether this aim is accomplished. Furthermore, how programs track the efficacy and safety of their programs remains largely unexplored. We sought to characterize ongoing quality monitoring among emergency clinician-staffed telehealth programs. METHODS: We identified representatives at emergency clinician-staffed telehealth programs through professional networks and published literature. Qualitative interviews were conducted, assessing quality metrics captured as well as motivations for and barriers to quality measurement. We classified quality metric measurement using the National Quality Forum Telehealth Measurement Framework Domains and Subdomains. We developed a codebook from interview transcripts for qualitative analysis to classify motivations for and barriers to quality measurement. RESULTS: We held 8 qualitative interviews with physician representatives at primarily academic (7/8) and urban institutions (5/8). Most widely used quality metrics were related to patient and care team experience (7/8) as well as to access to care (6/8) and effectiveness (6/8). Few programs (2/8) measured finance-related quality metrics. Motivations for quality measurement varied considerably. Common barriers to implementation included technology challenges, data availability, and the lack of quality metric standardization. CONCLUSION: We identified variation in the use and content of quality metrics across emergency clinician-staffed telehealth programs. Most commonly, programs used metrics related to clinical experience; financial metrics were rarely captured. Technology barriers to quality measurement were often cited across programs. Further work is needed to support the standardization and implementation of future quality measurement initiatives.


Subject(s)
Physicians , Telemedicine , Humans , Patient-Centered Care
3.
West J Emerg Med ; 22(6): 1218-1226, 2021 Sep 23.
Article in English | MEDLINE | ID: mdl-34787544

ABSTRACT

INTRODUCTION: Although emergency department (ED) discharge presents patient-safety challenges and opportunities, the ways in which EDs address discharge risk in the general ED population remains disparate and largely uncharacterized. In this study our goal was to conduct a review of how EDs identify and target patients at increased risk at time of discharge. METHODS: We conducted a literature search to explore how EDs assess patient risk upon discharge, including a review of PubMed and gray literature. After independently screening articles for inclusion, we recorded study characteristics including outcome measures, patient risk factors, and tool descriptions. Based on this review and discussion among collaborators, major themes were identified. RESULTS: PubMed search yielded 384 potentially eligible articles. After title and abstract review, we screened 235 for potential inclusion. After full text and reference review, supplemented by Google Scholar and gray literature reviews, we included 30 articles for full review. Three major themes were elucidated: 1) Multiple studies include retrospective risk assessment, whereas the use of point-of-care risk assessment tools appears limited; 2) of the point-of-care tools that exist, inputs and outcome measures varied, and few were applicable to the general ED population; and 3) while many studies describe initiatives to improve the discharge process, few describe assessment of post-discharge resource needs. CONCLUSION: Numerous studies describe factors associated with an increased risk of readmission and adverse events after ED discharge, but few describe point-of-care tools used by physicians for the general ED population. Future work is needed to investigate standardized tools that assess ED discharge risk and patients' needs upon ED discharge.


Subject(s)
Aftercare , Patient Discharge , Emergency Service, Hospital , Humans , Retrospective Studies , Risk Assessment
4.
J Am Coll Emerg Physicians Open ; 2(3): e12443, 2021 Jun.
Article in English | MEDLINE | ID: mdl-33969356

ABSTRACT

OBJECTIVE: The coronavirus disease 2019 pandemic has presented emergency departments (EDs) with many challenges to address the acute care needs of patients. Many EDs have leveraged telehealth to innovatively respond to these challenges. This review describes the landscape of telehealth initiatives in emergency care that have been described during the coronavirus disease 2019 pandemic. METHODS: We conducted a comprehensive, systematic review of the literature using PubMed, supplemented by a review of the gray literature (ie, non-peer reviewed), with input from subject matter experts to identify telehealth initiatives in emergency care during coronavirus disease 2019. We categorized types of telehealth use based on purpose and user characteristics. RESULTS: We included 27 papers from our review of the medical literature and another 8 sources from gray literature review. The vast majority of studies (32/35) were descriptive in nature, with the additional inclusion of 2 cohort studies and one randomized clinical trial. There were 5 categories of ED telehealth use during the pandemic: (1) pre-ED evaluation and screening, (2) within ED (including as a means of limiting staff and patient exposure and facilitating consultation with specialists), (3) post-ED discharge monitoring and treatment, (4) educating trainees and health care workers, and (5) coordinating resources and patient care. CONCLUSION: Telehealth has been used in a variety of manners during the coronavirus disease 2019 pandemic, enabling innovation in emergency care delivery. The findings from this study can be used by institutions to consider how telehealth may address challenges in emergency care during the coronavirus disease 2019 pandemic and beyond. Because few studies included cost data and given the variability in institutional resources, how organizations implement telehealth programs will likely vary. Future work should further explore barriers and facilitators of innovation, and the impact on care delivery and patient outcomes.

5.
Emerg Med J ; 38(6): 474-476, 2021 Jun.
Article in English | MEDLINE | ID: mdl-33674277

ABSTRACT

The use of telemedicine has grown immensely during the COVID-19 pandemic. Telemedicine provides a means to deliver clinical care while limiting patient and provider exposure to the COVID-19. As such, telemedicine is finding applications in a variety of clinical environments including primary care and the acute care setting and the array of patient populations who use telemedicine continues to grow. Yet as telehealth becomes ubiquitous, it is critical to consider its potential to exacerbate disparities in care. Challenges accessing technology and digital literacy, for example, disproportionately impact older patients and those living in poverty. When implemented with the consideration of health disparities, telemedicine provides an opportunity to address these inequities. This manuscript explores potential mechanisms by which telemedicine may play a role in exacerbating or ameliorating disparities in care. We further describe a framework and suggested strategies with which to implement telemedicine systems to improve health equity.


Subject(s)
Digital Divide , Health Equity/organization & administration , Telemedicine/organization & administration , COVID-19/epidemiology , COVID-19/therapy , Health Equity/statistics & numerical data , Healthcare Disparities/organization & administration , Healthcare Disparities/statistics & numerical data , Humans , Telemedicine/statistics & numerical data
6.
Pain Med ; 22(1): 67-74, 2021 02 04.
Article in English | MEDLINE | ID: mdl-33338224

ABSTRACT

OBJECTIVE: Back pain is one of the most common pain syndromes in the United States, but there has been limited recent description of the role of emergency departments (EDs) in caring for patients with back pain. We investigated trends in the evaluation and management of back pain in U.S. EDs from 2007 to 2016. METHODS: We performed a retrospective analysis of the National Hospital Ambulatory Medical Care Survey, a nationally representative annual survey of ED visits, which includes data on patient-, hospital-, and visit-level characteristics. We evaluated trends among adult ED visits for back pain, including demographics, resource utilization, and disposition. Trends were assessed through the use of survey-weighted analyses. RESULTS: Visit rates as a proportion of overall ED visits were stable from 2007 to 2016 (9.1% [95% confidence interval (CI): 8.5-9.6] vs. 9.3% [95% CI: 8.6-10.0]; P = 0.44). Admission rates declined from 6.4% (95% CI: 5.1-8.0) to 5.0% (95% CI: 3.5-6.9; P < 0.001). Imaging utilization increased from 51.7% (95% CI: 49.3-54.1) to 57.6% (95% CI: 53.3-61.7; P = 0.023), with an increase of 58.3% in computed tomography. Overall opioid utilization declined from 53.5% (95% CI: 49.4-57.5) to 46.5% (95% CI: 43.2-49.8; P < 0.001). Tramadol use increased over the study period (4.1% [95% CI: 3.0-5.8] vs. 8.4% [95% CI: 6.6-10.7]; P < 0.001). CONCLUSIONS: Opioid utilization during ED visits for back pain decreased from 2007 to 2016, whereas tramadol use more than doubled. Care intensity increased significantly despite declining admission rates. Further research into optimal strategies for back pain management in the ED is needed.


Subject(s)
Emergency Service, Hospital , Tomography, X-Ray Computed , Adult , Back Pain/diagnosis , Back Pain/epidemiology , Back Pain/therapy , Health Care Surveys , Humans , Retrospective Studies , United States/epidemiology
7.
Am J Emerg Med ; 38(10): 2028-2033, 2020 10.
Article in English | MEDLINE | ID: mdl-33142169

ABSTRACT

INTRODUCTION: Emergency department (ED) crowding is associated with increased mortality and delays in care. We developed a rapid admission pathway targeting critically-ill trauma patients in the ED. This study investigates the sustainability of the pathway, as well as its effectiveness in times of increased ED crowding. MATERIALS & METHODS: This was a retrospective cohort study assessing the admission of critically-ill trauma patients with and without the use of a rapid admission pathway from 2013 to 2018. We accessed demographic and clinical data from trauma registry data and ED capacity logs. Statistical analyses included univariate and multivariate testing. RESULTS: A total of 1700 patients were included. Of this cohort, 434 patients were admitted using the rapid admission pathway, whereas 1266 were admitted using the traditional pathway. In bivariate analysis, mean ED LOS was 1.54 h (95% Confidence Interval [CI]: 1.41, 1.66) with the rapid pathway, compared with 5.88 h (95% CI: 5.64, 6.12) with the traditional pathway (p < 0.01). We found no statistically significant relationship between rapid admission pathway use and survival to hospital discharge. During times of increased crowding, rapid pathway use continued to be associated with reduction in ED LOS (p < 0.01). The reduction in ED LOS was sustained when comparing initial results (2013-2014) to recent data (2015-2018). CONCLUSION: This study found that a streamlined process to admit critically-ill trauma patients is sustainable and associated with reduction in ED LOS. As ED crowding remains pervasive, these findings support restructured care processes to limit prolonged ED boarding times for critically-ill patients.


Subject(s)
Crowding , Patient Admission/standards , Time Factors , Wounds and Injuries/complications , Adult , Aged , Aged, 80 and over , Cohort Studies , Critical Illness/therapy , Emergency Service, Hospital/organization & administration , Emergency Service, Hospital/statistics & numerical data , Female , Hospitalization/statistics & numerical data , Humans , Length of Stay/statistics & numerical data , Male , Middle Aged , Patient Admission/trends , Retrospective Studies , Statistics, Nonparametric
8.
J Emerg Med ; 59(5): 705-709, 2020 Nov.
Article in English | MEDLINE | ID: mdl-32828602

Subject(s)
Medicaid , Humans
9.
West J Emerg Med ; 21(4): 892-899, 2020 Jul 08.
Article in English | MEDLINE | ID: mdl-32726261

ABSTRACT

INTRODUCTION: Delays in identification and treatment of acute stroke contribute to significant morbidity and mortality. Multiple clinical factors have been associated with delays in acute stroke care. We aimed to determine the relationship between emergency department (ED) crowding and the delivery of timely emergency stroke care. METHODS: We used prospectively collected data from our institutional Get with the Guidelines-Stroke registry to identify consecutive acute ischemic stroke patients presenting to our urban academic ED from July 2016-August 2018. We used capacity logs to determine the degree of ED crowding at the time of patients' presentation and classified them as ordinal variables (normal, high, and severe capacity constraints). Outcomes of interest were door-to-imaging time (DIT) among patients potentially eligible for alteplase or endovascular therapy on presentation, door-to-needle time (DTN) for alteplase delivery, and door-to-groin puncture (DTP) times for endovascular therapy. Bivariate comparisons were made using t-tests, chi-square, and Wilcoxon rank-sum tests as appropriate. We used regression models to examine the relationship after accounting for patient demographics, transfer status, arrival mode, and initial stroke severity by the National Institutes of Health Stroke Scale. RESULTS: Of the 1379 patients with ischemic stroke presenting during the study period, 1081 (78%) presented at times of normal capacity, 203 (15%) during high ED crowding, and 94 (7%) during severe crowding. Median DIT was 26 minutes (interquartile range [IQR] 17-52); DTN time was 43 minutes (IQR 31-59); and median DTP was 58.5 minutes (IQR 56.5-100). Treatment times were not significantly different during periods of higher ED utilization in bivariate or in multivariable testing. CONCLUSION: In our single institution analysis, we found no significant delays in stroke care delivery associated with increased ED crowding. This finding suggests that robust processes of care may enable continued high-quality acute care delivery, even during times with an increased capacity burden.


Subject(s)
Brain Ischemia , Crowding , Delayed Diagnosis/prevention & control , Emergency Service, Hospital/organization & administration , Emergency Treatment , Stroke , Time-to-Treatment/standards , Aged , Brain Ischemia/epidemiology , Brain Ischemia/therapy , Emergency Treatment/methods , Emergency Treatment/statistics & numerical data , Female , Humans , Male , Massachusetts/epidemiology , Quality of Health Care , Retrospective Studies , Stroke/epidemiology , Stroke/therapy
10.
J Emerg Med ; 59(2): 265-269, 2020 Aug.
Article in English | MEDLINE | ID: mdl-32571639

ABSTRACT

BACKGROUND: Proximal humeral fractures are commonly encountered in the emergency department (ED). These injuries are often associated with significant pain, with patients often receiving multiple doses of opiate medications while awaiting definitive management. The interscalene nerve block has been efficacious as perioperative analgesia for patients undergoing operative shoulder repair. The utilization of the interscalene nerve block in the ED for proximal humeral fractures is largely unexplored. DISCUSSION: We report the use of an ultrasound-guided interscalene nerve block in the ED for a patient presenting with significant pain from a proximal humerus fracture. The procedure provided excellent regional anesthesia with no additional need for intravenous or oral opiates during the rest of her ED course. With the significant risks associated with pain medication, particularly opiates, regional anesthesia may be an excellent option for the appropriate patient in the ED. CONCLUSIONS: As documented in this report, the ultrasound-guided interscalene block, in particular, may be utilized as a means to provide adequate pain control for patients with proximal humerus fractures in the ED.


Subject(s)
Brachial Plexus Block , Shoulder Fractures , Female , Humans , Shoulder , Shoulder Fractures/surgery , Ultrasonography , Ultrasonography, Interventional
11.
Toxicol Commun ; 3(1): 79-84, 2019.
Article in English | MEDLINE | ID: mdl-31745533

ABSTRACT

Methylene chloride is a volatile, chlorinated hydrocarbon and colorless solvent found in multiple industrial products including paint strippers, metal cleaners, automotive products, pesticides and aerosol containers. Occupational exposure to methylene chloride is reported in automotive technicians, painters, and other industrial workers with adverse health effects including gastrointestinal, neurological, as well as hepato-renal injuries. International Agency for Research on Cancer (IARC) classifies methylene chloride as a 2 A carcinogen. Through a series of reactions catalyzed by cytochrome P450 2E1 (CYP2E1), metabolism of methylene chloride leads to the formation of formyl chloride, and ultimately carbon monoxide (CO). Most reports of methylene chloride toxicity are due to dermal and inhalational exposure in occupational settings. Ingestion of methylene chloride is uncommon, yet can lead to significant toxicity and prolonged CO toxicity. Methylene chloride is frequently formulated with methanol; individuals who intentionally ingest methylene chloride can experience concomitant methanol toxicity. We present a case of acute ingestion of paint stripper containing methanol and methylene chloride. We discuss the clinical presentation, key management decisions, relevant pathophysiology and biochemistry, as well as the clinical course and management.

12.
Ann Emerg Med ; 72(6): 733-734, 2018 12.
Article in English | MEDLINE | ID: mdl-30454802
14.
J Surg Educ ; 75(4): 928-934, 2018.
Article in English | MEDLINE | ID: mdl-28974428

ABSTRACT

OBJECTIVE: To understand how practicing surgeons utilize available training methods, which methods are perceived as effective, and important barriers to using more effective methods. DESIGN: Online survey designed to characterize surgeon utilization and perception of available training methods. SETTING: Two large Midwestern academic health centers. PARTICIPANTS: 150 faculty surgeons. METHODS: Nominal values were compared using a McNemar's Test and Likert-like values were compared using a paired t-test (IBM SPSS Statistics v. 21.0; New York, NY). RESULTS: Survey response rate was 81% (122/150). 98% of surgeons reported learning a new procedure or technology after formal training. Many surgeons reported scrubbing in expert cases (78%) and self-directed study (66%), while few surgeons (6%) completed a mini-fellowship. The modalities used most commonly were scrubbing in expert cases (34%) and self-directed study (27%). Few surgeons (7%) believed self-directed study would be most effective, whereas 31% and 16% believed operating under supervision and mini-fellowships would be most effective, respectively. Surgeons believed more effective methods "would require too much time" or they had "confidence in their ability to implement safely." CONCLUSIONS: Practicing surgeons use a variety of training methods when learning new procedures and technologies, and there is disconnect between commonly used training methods and those deemed most effective. Confidence in surgeon's ability was cited as a reason for this discrepancy; and surgeons found time associated with more effective methods to be prohibitive.


Subject(s)
Clinical Competence , Education, Medical, Continuing , Surgeons/education , Academic Medical Centers , Humans , Learning , Michigan , Surveys and Questionnaires
15.
J Surg Res ; 218: 361-366, 2017 10.
Article in English | MEDLINE | ID: mdl-28985875

ABSTRACT

BACKGROUND: There exists a tension between surgical innovation and safety. The learning curve associated with the introduction of new procedures/technologies has been associated with preventable patient harm. Surgeon's perceptions regarding the safety of methods for learning new procedures/technologies are largely uncharacterized. MATERIALS AND METHODS: A survey was designed to evaluate surgeons' perceptions related to learning new procedures/technologies. This included clinical vignettes across two domains: (1) experience with an operation (e.g., colectomy) and (2) experience with a technology (e.g., laparoscopy). This study also focuses on a surgeon's perceptions of existing credentialing/privileging requirements. Participants were faculty surgeons (n = 150) at two large Midwestern academic health centers. RESULTS: Survey response rate was 77% (116/150). 69% of respondents believed the processes of credentialing/privileging is "far too relaxed" or "too relaxed" for ensuring patient safety. Surgeons most commonly indicated a mini-fellowship is required to learn a new laparoscopic procedure. However, that requirement differed based on a surgeon's prior experience with laparoscopy. For example, to learn laparoscopic colectomy, 35% of respondents felt a surgeon with limited laparoscopic experience should complete a mini-fellowship, whereas 3% felt this was necessary if the surgeon had extensive laparoscopic experience. In the latter scenario, most respondents felt a surgeon should scrub in cases performed by an expert (38%) or perform cases under a proctor's supervision (33%) when learning laparoscopic colectomy. CONCLUSIONS: Many surgeons believe existing hospital credentialing/privileging practices may be too relaxed. Moreover, surgeons believe the "one-size-fits-all" approach for training practicing surgeons may not protect patients from unsafe introduction of new procedures/technologies.


Subject(s)
Credentialing , Education, Medical, Continuing , Patient Safety , Surgeons/psychology , Humans , Surgeons/education , Surgeons/statistics & numerical data , Surveys and Questionnaires
16.
Ann Surg ; 265(6): 1178-1182, 2017 06.
Article in English | MEDLINE | ID: mdl-27537537

ABSTRACT

OBJECTIVE: To assess the value of bundling perioperative care measures in colon surgery. BACKGROUND: Surgical site infections (SSI) in colectomy are associated with increased morbidity and cost. Perioperative care bundling has been designed to improve processes of care surrounding colectomy operations. METHODS: Retrospective cohort study performed by the Michigan Surgical Quality Collaborative (MSQC) of patients who underwent elective colon surgery from 2012 to 2015. We identified 3,387 patients in the MSQC database who underwent colon surgery. Of these cases, 332 had associated episodic cost data. RESULTS: High compliance (3-6 bundle elements) and low compliance (0-2 bundle elements) had a risk-adjusted SSI rate of 8.2% (95% confidence interval, CI, 7.2-9.2%) and 16.0% (95% CI, 12.9-19.1%), respectively (P < 0.01). When compared with low compliance, the high compliance group had an absolute risk reduction of 3.6% (P < 0.01), 2.9% (P < 0.01) and 1.3% (P < 0.01) for SSI rates in superficial space, deep space, and organ space, respectively. Low compliance had an average episodic cost of $20,046 (95% CI, $17,281-$22,812) whereas high compliance had an episodic cost of $15,272 (95% CI, $14,354-$16,192). This showed a $4,774 (95% CI, $1,859-$7,688) and 23.8% cost reduction (P < 0.01). Facility base payments decreased 14.8% ($13,444; $11,458), professional payments decreased 43.9% ($5,180; $2,906), and other payments decreased 36.2% ($1,422; $908). CONCLUSIONS: A colectomy perioperative care bundle in Michigan is associated with improved value of surgical care. We will expand efforts to implement perioperative care bundles in Michigan to improve outcomes and reduce costs.


Subject(s)
Colectomy , Perioperative Care/economics , Perioperative Care/methods , Surgical Wound Infection/prevention & control , Adolescent , Adult , Aged , Anti-Bacterial Agents/therapeutic use , Blood Glucose/metabolism , Body Temperature , Cost Savings , Guideline Adherence , Humans , Michigan , Middle Aged , Minimally Invasive Surgical Procedures , Operative Time , Perioperative Care/standards , Quality Improvement , Retrospective Studies , Young Adult
18.
Pain Med ; 14(6): 865-73, 2013 Jun.
Article in English | MEDLINE | ID: mdl-23570280

ABSTRACT

OBJECTIVES: The intrathecal administration of morphine sulfate has become an established alternative to oral opiate therapy for the treatment of chronic pain. Currently, Infumorph(®) is the only morphine sulfate approved by the US Food and Drug Administration for continuous intraspinal administration with an infusion pump. However, in order to achieve and maintain adequate pain relief, patients may require concentrations outside of those commercially available products resulting in the use of compounded morphine. METHODS: Accuracy, safety, and efficacy data related to Infumorph and compounded morphine use were collected during clinical trials of a new implantable pump. This report compares those results in a total of 154 subjects implanted with the Prometra programmable pump. RESULTS: The mean drug delivery accuracy using only Infumorph in 31 subjects was 100.1% and was comparable with the accuracy reported for the 71 subjects who received only compounded morphine sulfate (97.4%). The percentage of subjects free from device-related serious adverse events (DRSAEs) was similar in both groups. Compounded morphine showed statistically significant improvements in pain and disability, where Infumorph only showed a statistical improvement in pain. Dosing was higher in the compounded group. Results are also presented for a crossover group that received both types of morphine. CONCLUSIONS: ThePrometra system accurately delivers both Infumorph and compounded morphine with no significant differences in DRSAE rates. These results indicate that compounded morphine delivery effectively treats the chronic pain patient population. Higher doses appear to provide better pain relief; however, optimal pain relief will need to be balanced against the risk of granuloma formation.


Subject(s)
Drug Therapy, Computer-Assisted/instrumentation , Infusion Pumps , Injections, Spinal/instrumentation , Morphine/administration & dosage , Pain Measurement/drug effects , Pain, Intractable/diagnosis , Pain, Intractable/drug therapy , Dose-Response Relationship, Drug , Drug Compounding , Drug Therapy, Computer-Assisted/methods , Equipment Design , Equipment Failure Analysis , Female , Humans , Injections, Spinal/methods , Male , Middle Aged , Morphine/classification , Treatment Outcome , United States
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