Publications by authors named "Michael Dalton"

The vesicular monoamine transporter 2 (VMAT2) is a proton-dependent antiporter responsible for loading monoamine neurotransmitters into synaptic vesicles. Dysregulation of VMAT2 can lead to several neuropsychiatric disorders including Parkinson's disease and schizophrenia. Furthermore, drugs such as amphetamine and MDMA are known to act on VMAT2, exemplifying its role in the mechanisms of actions for drugs of abuse.

View Article and Find Full Text PDF

Cell-based therapies hold promise for many chronic conditions; however, the continued need for immunosuppression along with challenges in replacing cells to improve durability or retrieving cells for safety are major obstacles. We subcutaneously implanted a device engineered to exploit the innate transcapillary hydrostatic and colloid osmotic pressure generating ultrafiltrate to mimic interstitium. Long-term stable accumulation of ultrafiltrate was achieved in both rodents and nonhuman primates (NHPs) that was chemically similar to serum and achieved capillary blood oxygen concentration.

View Article and Find Full Text PDF

The vesicular monoamine transporter 2 (VMAT2) is a proton-dependent antiporter responsible for loading monoamine neurotransmitters into synaptic vesicles. Dysregulation of VMAT2 can lead to several neuropsychiatric disorders including Parkinson's disease and schizophrenia. Furthermore, drugs such as amphetamine and MDMA are known to act on VMAT2, exemplifying its role in the mechanisms of actions for drugs of abuse.

View Article and Find Full Text PDF
Article Synopsis
  • In 2015, the U.S. transitioned from ICD-9 to ICD-10 coding for emergency general surgery (EGS) diagnoses, prompting a need to establish an equivalent list of ICD-10 codes using a general equivalence mapping (GEM).
  • The study compared the patient volumes admitted with EGS diagnoses during the ICD-9 and ICD-10 periods, identifying discrepancies and issues in the mapping process that resulted in 485 ICD-9 codes mapping to 1,206 ICD-10 codes, with only 40% having exact one-to-one matches.
  • Key challenges in the GEM crosswalk included changes in admission volumes, loss of critical modifiers, absence of specific ICD-10 codes, inaccurate mapping, and
View Article and Find Full Text PDF

Introduction: Beneficiaries of TRICARE, an insurance program of the military health system, can choose to receive care within the private sector (fee-for-service) or direct (budget-based facilities with salaried providers) care setting. Previous studies in several specialties have shown that there are disparities in both resource utilization and outcomes between the two settings. In this study, we sought to determine differences in outcomes between coronavirus disease 2019 (COVID-19) patients treated in the private sector versus direct care.

View Article and Find Full Text PDF

Background: By providing definitive care for many, and rapid assessment, resuscitation, stabilization, and transfer to Level I/II centers when needed, Level III trauma centers can augment capacity in high resource regions and extend the geographic reach to lower resource regions. We sought to (1) characterize populations served principally by Level III trauma centers, (2) estimate differences in time to care by trauma center level, and (3) update national estimates of trauma center access.

Methods: In a cross-sectional study (United States, 2019), we estimated travel time from census block groups to the nearest Level I/II trauma center and nearest Level III trauma center.

View Article and Find Full Text PDF
Article Synopsis
  • Opioids continue to be the primary treatment for acute pain from traumatic injuries, despite concerns about long-term dependence, and effective early pain management can improve long-term outcomes for patients.
  • A study of 2019 EMS data showed that out of over 3.8 million injured patients, only 7% received opioids, with fentanyl being the most commonly used, and those treated with opioids reported higher initial pain scores but experienced a significant reduction in pain.
  • The study noted that while some adverse events were documented, such as altered mental status and respiratory issues, these were rare, indicating that opioid use in the prehospital setting is effective and relatively safe for managing severe pain in injured patients.
View Article and Find Full Text PDF
Article Synopsis
  • Geographic variation is a key aspect of the US health system, and this study aims to better define Trauma Referral Regions (TRR) to assess inpatient trauma across different age groups.
  • Using data from 2016-2017, the research analyzed hospital use metrics (localization index, market share index, net patient flow) across 102 TRRs and compared them to other regional definitions.
  • Results showed that TRRs effectively represent distinct trauma regions with consistent hospital use metrics and are linked to important demographic factors, making them a useful tool for evaluating geographic variation in trauma care.
View Article and Find Full Text PDF

Background: The long-term consequences of musculoskeletal trauma can be profound and can extend beyond the post-injury period. The surveillance of long-term expenditures among individuals who sustain orthopaedic trauma has been limited in prior work. We sought to compare the health-care requirements of active-duty individuals who sustained orthopaedic injuries in combat and non-combat (United States) environments using TRICARE claims data.

View Article and Find Full Text PDF

Importance: Many women in the US, particularly those living in rural areas, have limited access to obstetric care. Military-civilian partnership could improve access to obstetric care and benefit military personnel, their civilian dependents, and the civilian population as a whole.

Objective: To identify medical facilities within military and civilian geographic areas that present opportunities for military-civilian partnership in obstetric care and to assess whether civilian use of military medical treatment facilities (MTFs) could improve access to emergency cesarean delivery care in the US.

View Article and Find Full Text PDF
Article Synopsis
  • The study evaluates different definitions of health care regions in the U.S., particularly focusing on the Pittsburgh Atlas and Dartmouth Atlas, to analyze COVID-19-related pneumonia admissions.
  • Using data from the Agency for Healthcare Research and Quality, researchers assessed concordance in care, localization index, and market share across three definitions of health regions (Pittsburgh Atlas, Dartmouth Atlas, and counties).
  • Results demonstrated that both the Pittsburgh and Dartmouth Atlases performed similarly and significantly better than county definitions in terms of regional care metrics, highlighting the importance of regional definitions for improving healthcare delivery during the pandemic.
View Article and Find Full Text PDF

Introduction: The first states began implementing the Medicaid expansion provisions of the Patient Protection and Affordable Care Act (ACA) in 2014. Studies have yet to address its impact on burn patients.

Methods: Burn patients in geographic regions that expanded Medicaid coverage were compared to patients in regions that did not expand Medicaid before and after implementation of the ACA using bivariate statistics and a difference-in-differences model.

View Article and Find Full Text PDF

Importance: Low surgical volume in the US Military Health System (MHS) has been identified as a challenge to military surgeon readiness. The Uniformed Services University of Health Sciences, in partnership with the American College of Surgeons, developed the Knowledge, Skills, and Abilities (KSA) Clinical Readiness Program that includes a tool for quantifying the clinical readiness value of surgeon workload, known as the KSA metric.

Objective: To describe changes in US military general surgeon procedural volume and readiness using the KSA metric.

View Article and Find Full Text PDF

Background: Older adults may have new care needs and functional limitations after surgery. Many rely on informal caregivers (unpaid family or friends) after discharge but the extent of informal support is unknown. We sought to examine the role of informal postoperative caregiving on transitions of care for older adults undergoing routine surgical procedures.

View Article and Find Full Text PDF
Article Synopsis
  • The study investigates the impact of health care reforms in the US Military Health System, which will transition over 1.9 million beneficiaries from military treatment facilities to civilian hospitals in the coming years.
  • It compares the quality of care received by MHS beneficiaries in military facilities (Direct Care) versus civilian hospitals (Purchased Care) using specific quality metrics, examining differences in mortality, morbidity, and patient safety.
  • Findings indicate that, on average, MHS beneficiaries treated in military facilities receive better inpatient care and patient safety than those treated in local civilian hospitals, suggesting potential quality declines as the reforms are implemented.
View Article and Find Full Text PDF

Unlabelled: This paper examines employment patterns by wage group over the course of the coronavirus pandemic in the United States using microdata from two well-known data sources from the U.S. Bureau of Labor Statistics: the Current Employment Statistics and the Current Population Survey.

View Article and Find Full Text PDF

Objective: We sought to quantify the impact of injury characteristics and setting on the development of mental health conditions, comparing combat to noncombat injury mechanisms.

Background: Due to advances in combat casualty care, military service-members are surviving traumatic injuries at substantial rates. The nature and setting of traumatic injury may influence the development of subsequent mental health disorders more than clinical injury characteristics.

View Article and Find Full Text PDF

Introduction: During the Global War on Terrorism, many US Military service members sustained injuries with potentially long-lasting functional limitations and chronic pain. We sought to understand the patterns of prescription opioid use among service members injured in combat.

Methods: We queried the Military Health System Data Repository to identify service members injured in combat between 2007 and 2011.

View Article and Find Full Text PDF

Background: Traumatic brain injury (TBI) is one of the most common injuries resulting from U.S. Military engagements since 2001.

View Article and Find Full Text PDF

The sarco-plasmic reticulum calcium pump (SERCA) plays a critical role in the contraction-relaxation cycle of muscle. In cardiac muscle, SERCA is regulated by the inhibitor phospholamban. A new regulator, dwarf open reading frame (DWORF), has been reported to displace phospholamban from SERCA.

View Article and Find Full Text PDF

Ciclopirox (CPX) is an FDA-approved topical antifungal agent that has demonstrated preclinical anticancer activity in a number of solid and hematologic malignancies. Its clinical utility as an oral anticancer agent, however, is limited by poor oral bioavailability and gastrointestinal toxicity. Fosciclopirox, the phosphoryloxymethyl ester of CPX (Ciclopirox Prodrug, CPX-POM), selectively delivers the active metabolite, CPX, to the entire urinary tract following parenteral administration.

View Article and Find Full Text PDF

Background: Black hip fracture patients experience worse health outcomes than otherwise similar White patients, but causes of these disparities are not known. We sought to determine if delays in hip fracture surgery and/or hospital structures contribute to racial disparities in hip fracture outcomes.

Methods: Using 2006 to 2016 Trauma Quality Program Public Use Files, we identified hip fracture patients with primary mechanisms of fall from standing and determined surgical treatment category (no surgery, surgery within 24 hours after arrival, surgery 24-48 hours after arrival, surgery more than 48 hours after arrival) as well as hospital structure characteristics (trauma center designation, teaching status, profit status, bed size).

View Article and Find Full Text PDF

Objective: The aim of this study was to critically evaluate whether admission at the beginning versus end of the academic year is associated with increased risk of major adverse outcomes.

Summary Background Data: The hypothesis that the arrival of new residents and fellows is associated with increases in adverse patient outcomes has been the subject of numerous research studies since 1989. Methods: We conducted a systematic review and random-effects meta-analysis of July Effect studies published before December 20, 2019, looking for differences in mortality, major morbidity, and readmission.

View Article and Find Full Text PDF

Objective: We sought to evaluate long-term healthcare requirements of American military servicemembers with combat-related injuries.

Summary Of Background Data: US military conflicts since 2001 have produced the most combat casualties since Vietnam. Long-term consequences on healthcare utilization and associated costs remain unknown.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_sessions8d7fskesmvi50hes8s3m8vp8k0qtib9): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once