Volume kinetics of crystalloid and colloid solutions administered to healthy anesthetized cats

by Chien-Hsien Kitty Yang, Xiu Ting Yiew, Robert G. Hahn, William Muir, Carolyn Kerr, Shane Bateman

This prospective experimental study evaluated the disposition of a crystalloid and a colloid solution in 10 healthy cats under general anesthesia. Each cat was randomly assigned to receive either 20 mL/kg of a balanced isotonic crystalloid solution (PLA) or 5 mL/kg of 6% tetrastarch 130/0.4 solution (T-HES), administered over 15 minutes, in a 2-period, 2-treatment crossover design. Blood samples were collected, and urine output was measured during a 3-hour experimental period. Plasma dilution was calculated using serial hemoglobin concentrations and red blood cell count. Volume kinetics (distribution and elimination) of each fluid were determined using non-linear mixed effects pharmacokinetic modeling software. Data from a previous study with a similar methodology in healthy conscious cats were included in the population kinetic analysis, revealing anesthesia as a significant covariate for k₂₁ (peripheral-to-central intercompartmental rate constant) for PLA and k₁₀ (dilution-dependent first-order elimination rate constant) for T-HES. Cumulative urine output under general anesthesia was approximately 3.5 times lower for PLA and 2.5 times lower for T-HES compared to conscious cats. Overall, our data suggest that the elimination of PLA and T-HES is markedly reduced, and a bolus of PLA produces a short period of plasma expansion with the potential to cause significant peripheral fluid accumulation in cats during general anesthesia.

Migrant-friendly maternity care in Montreal, Canada: A cross-sectional study on migrant women’s care perspectives

by Isabel Baltzan, Lisa Merry, William Fraser, Sonia Semenic, Sandra Pelaez, Alexis Edington, Ayesha Baig, Anita Gagnon

Objective

We assessed the extent to which recommended migrant-friendly maternity care (MFMC) components were provided to recently-arrived international migrants giving birth in Montreal, Canada, and the extent to which the provision of MFMC components was related to socioeconomic and migratory characteristics.

Methods

We conducted a cross-sectional study of migrant women giving birth in four hospitals in 2014–2015. Data were collected using the Migrant-Friendly Maternity Care Questionnaire (MFMCQ), focusing on access to prenatal care, communication facilitation, healthcare provider (HCP) support, and responsiveness to preferences for care. Data were analyzed descriptively and through logistic regression.

Results

Of 2636 participants, most reported always being kept informed (86.1%) and finding HCPs helpful (90.3%), although 22.9% reported barriers to accessing services during pregnancy, and only 11% or less were asked about care preferences. Of 847 needing interpreters, 84.7% reported not being offered any. Worse access to prenatal care was reported among women who had arrived more recently [OR 0.55, 95% CI 0.36, 0.85], had lower income [0.69 (0.52, 0.90)], or had less education [0.66 (0.47, 0.94)]. Low language ability was most often associated with inadequate MFMC [e.g., worse HCP support during pregnancy [0.56 (0.36, 0.87)] and worse responsiveness to preferences for care during labour [0.55 (0.31, 0.98)]]. Maternal region of birth was associated both positively and negatively with all MFMC components.

Conclusion

Although some MFMC has been implemented, gaps remain. Addressing language barriers remains a top priority. To deliver optimal MFMC, HCPs and policymakers should provide care that is responsive to women’s socioeconomic and migratory backgrounds.

Registered nurse effect on long length of stay in the heart failure hospitalizations of African Americans

by Tremaine B. Williams, Pearman Parker, Milan Bimali, Maryam Y. Garza, Alisha Crump, Taiquitha Robins, Emel Seker, Ava Storey, Allison Purvis, Mya Tolbert, Anthony Drake, Taren Massey Swindle, Kevin Wayne Sexton

African Americans experience approximately 2.5 times more heart failure hospitalizations than Caucasians and the complexity of heart failure requires registered nurses to work in collaboration with other types of healthcare professionals. The purpose of this study was to identify care team configurations associated with long lengths of hospital stay in African Americans with heart failure hospitalizations and the related effect of the presence of registered nurses on their length of hospital stay. This study analyzed electronic health record data on the heart failure hospitalizations of 2,274 African American patients. Binomial logistic regression identified the association between specific care team configurations and length of stay among subgroups of African American patients. Of the significant team configurations, a Kruskal-Wallis H test and linear regression further assessed the team composition and the specific change in days associated with a one-unit change in the number of registered nurses on a patient’s care team. Six team configurations were associated with a long length of stay among all African Americans regardless of age, sex, rurality, heart failure severity, and overall health severity. The configurations only differed significantly in the proportion of registered nurses with respect to other care team roles. An increase in one additional registered nurse on a care delivery team was associated with an increase in length of stay of 8.4 hours (i.e., 504 minutes). Identifying the full range of social and technical care delivery tasks performed by RNs, and controlling for their effect on length of stay, may be a key strategy for reducing length of stay and explaining why these six configurations and RNs are associated with long LOS. The identification of these models can be used to support decision-making that optimizes the availability of patient access to high-quality care (e.g., clinical staffing and supplies).

The relationship between family environments growing up and behavioral health among LGBTQ+ adults: The mediating role of internalized homonegativity

by Pin-Chen Chiang, Yinuo Xu, Denise Yookong Williams, Ankur Srivastava, Jake A. Leite, Adam R. Englert, William J. Hall

Purpose

Disparities in the behavioral health outcomes for lesbian, gay, bisexual, transgender, and queer+ (LGBTQ+) adults—such as depression, anxiety, and alcohol use—are often attributed to experiences of discrimination, victimization, and lack of supportive environments, including hetero- and cis-normative family settings. Yet, how family environments in childhood influence LGBTQ+ adults’ behavioral health and internalized homonegativity has not been extensively examined.

Methods

This study utilized a U.S. national dataset of LGBTQ+ adults (N = 499). Data were collected in November 2020 using an online survey. A series of multivariate ordinary least squares regression models and Sobel tests were performed.

Results

Results showed that as homophobic messages from family increased, levels of depression (β = .19, p β = .17, p β = .13, p β = .11, p β = .15, p z = 3.35, p z = 3.09, p z = 2.80, p z = 2.66, p z = 3.76, p z = 3.45, p  Conclusion

Study findings underscore the importance of inclusive climates within a family and internalized homonegativity as a mediator for LGBTQ+ individuals’ behavioral health. Implications for intervention and future research are discussed.

Impact of diabetes mellitus on 30-day mortality among acute stroke patients in northern Tanzania

by Eugénie M. Kamabu, Justin L. Paluku, William P. Howlett, Abid M. Sadiq, Eliada B. Nziku, Doreen T. Eliah, Ibrahim Ali Ibrahim Muhina, Fuad H. Said, Tumaini E. Mirai, Elifuraha W. Mkwizu, Furaha S. Lyamuya, Elichilia R. Shao, Kajiru G. Kilonzo, Venance P. Maro, Sarah J. Urasa, Nyasatu G. Chamba

Background

Among acute stroke patients (ASPs), diabetes mellitus (DM) is associated with a higher risk of death, functional dependency, and recurrence. This study aimed to determine the impact of DM on the 30-day mortality among admitted ASPs in northern Tanzania.

Materials and methods

This was a hospital-based prospective cohort study performed among ASPs with and without DM who were admitted to Kilimanjaro Christian Medical Centre from November 2022 to May2023. ASPs were followed for 30 days after the onset of an acute stroke to identify the primary outcome, which was all-cause mortality. Descriptive statistics, logistic regression, and survival analysis were conducted,

Results

Out of 213 ASP, 82 (38.5%) had DM. The overall crude mortality rate was 46.9%. ASPs with DM had a higher mortality rate of 53.7% compared with those without DM (42.7%). A higher proportion of acute stroke patients with DM (84.1%) had a poor outcome (mRS 3-6) (p = 0.038). DM was statistically non-significant for 30-day mortality (aHR 1.56; 95% CI: 0.73–3.32; p = 0.252). However, fever (p = 0.005), severe admission Glasgow coma scale (p = 0.005), severe stroke (p = 0.008), elevated serum creatinine (p = 0.008), and an abnormal respiratory pattern (p = 0.042), were predictors of 30-day mortality,

Conclusion

This study demonstrated a high mortality in ASPs. Although DM did not have a significant impact on 30-day mortality, other factors, such as altered mental state, stroke severity, fever, elevated creatinine, and abnormal respiration, need to be accounted for that may have a significant impact on the mortality in ASPs. These findings highlight the significant burden of DM in stroke patients and underscore the importance of early diagnosis and treatment of ASPs, in the hopes of improving clinical practice and guidelines and reducing morbidity and mortality in Tanzania.

3D ophthalmic ultrasonography at the slit lamp using existing ultrasound systems

by Jack O. Thomas, Josiah K. To, Parsa Riazi Esfahani, Frithjof Kruggel, William C. Tang, Andrew W. Browne

Purpose

This study aims to explore the feasibility and performance of three-dimensional ultrasound (3DUS) imaging in ophthalmology using commercially available ultrasound probes adapted to a slit lamp.

Significance

Despite ultrasound’s long-standing application in eye care for visualizing ocular components, the evolution of 3DUS technology has remained inactive, with limited development and commercial availability. This study introduces a novel method that could potentially enhance ophthalmic diagnostics and treatment planning by providing comprehensive 3D views of ocular structures using existing ultrasound probes adapted to the conventional slit lamp.

Methods

A custom system was designed for mounting a linear actuator to a slit lamp and enabling the horizontal actuation of any ultrasound probe. Ophthalmic and non-ophthalmic ultrasound probes were tested for their ability to reconstruct 3DUS images of the posterior pole. The study involved designing and evaluating three US phantoms ex vivo and performing in vivo imaging on human subjects to assess the system’s applicability.

Results

The system successfully acquired 3D volume scans of phantoms and live human eyes, demonstrating the system’s potential for detailed ocular imaging. The adaptability of the device allowed for compatibility with various ultrasound probes. In vivo imaging revealed the system’s capability to produce high-resolution 3D reconstructions of ocular structures, including eyes with pathological conditions.

Conclusions

The introduction of a slit lamp-mounted 3DUS system represents a significant advancement in ophthalmic ultrasonography, offering a practical and accessible solution for comprehensive 3D ocular assessments. The device’s modularity and compatibility with existing ultrasound probes make it a versatile tool for a wide range of ophthalmic applications. Further research and clinical trials are needed to optimize the system’s performance and validate its clinical utility.

Mesothelial cell responses to acute appendicitis or small bowel obstruction reactive ascites: Insights into immunoregulation of abdominal adhesion

by Melissa A. Hausburg, Kaysie L. Banton, Christopher D. Cassidy, Robert M. Madayag, Carlos H. Palacio, Jason S. Williams, Raphael Bar-Or, Rebecca J. Ryznar, David Bar-Or

Previous abdominal surgery (PAS) increases risk of small bowel obstruction (SBO) due to adhesions, and appendectomy (appy) is an independent risk factor for abdominal adhesion-related complications. Peritoneal inflammation, e.g., acute appendicitis (AA), causes formation of reactive ascitic fluid (rA) that activates peritoneum surface mesothelial cells (MCs) to form adhesions. Pathologic adhesions may arise if restoration of MC-regulated fibrinolysis and secretion of glycocalyx (GCX) are disrupted. Proteins affecting these processes may originate from peritoneal rA. This is a prospective observational IRB-approved study at three Level 1 trauma centers where rA is collected prior to surgical intervention for non-perforated AA or adhesiolysis for SBO. Samples from 48 appy and 15 SBO patients were used to treat human MCs and subjected to quantification of 85 inflammatory mediators. Results were compared between patients with surgically naïve abdomens (naïve) and patients with >1 PAS. Select rA caused MCs to form clusters of fibroblastic cells, extracellular matrix fibers (FIB), and secretion of GCX. PAS and naïve patient rA fluids were clustered into “fiber-GCX” (FIB-GCX) groups: highFIB-highGCX, highFIB-lowGCX, noFIB-highGCX, noFIB-lowGCX, and noFIB-noGCX. Between groups, 26 analytes were differentially abundant including innate immune response, wound healing, and mucosal defense proteins. Factors that contributed to the differences between groups were rA-induced highFIB and history of PAS. Overall, PAS patient rA showed a muted immune response compared to rA from naïve patients. Our data suggest that abdominal surgery may negatively impact future immune responses in the abdomen. Further, quantifying immunomodulators in peritoneal rA may lead to the development a personalized approach to post-surgical adhesion treatment and prevention.

Impact of vitamin C on the reduction of opioid consumption for acute musculoskeletal pain: A double-blind randomized control pilot study

by Raoul Daoust, Jean Paquet, David Williamson, Vérilibe Huard, Caroline Arbour, Jeffrey J. Perry, Marcel Émond, Simon Berthelot, Patrick Archambault, Dominique Rouleau, Judy Morris, Alexis Cournoyer

Introduction

Recent evidence has shown that vitamin C has analgesic and opioid sparing properties in immediate postoperative context. However, this has never been studied for acute musculoskeletal (MSK) emergency department (ED) injuries. The aim of this pilot study is to evaluate the feasibility of conducting a randomized placebo-controlled study to determine the opioid sparing and analgesic effect of vitamin C compared to placebo, in acute MSK injured ED patients.

Methods

A double-blind randomized controlled trial (RCT) distributed in two arms, stratified for fractures, was performed in a tertiary care center, one group receiving 1 g of vitamin C twice a day for 14 days and another receiving placebo. Participants were ≥18 years of age, treated in ED for MSK injuries present for ≤2 weeks, and discharged with a standardized opioid prescription of 20 morphine 5 mg tablets (M5T) and, at the clinician discretion, 28 tablets of naproxen 500 mg. Participants completed a 14-day paper diary and were contacted by phone at 14 days, to document their analgesic use, vitamin C consumption, and pain intensity.

Results

Overall, 137 patients were screened; 44(32%) were excluded, 38(40.9%) refused, leaving 55(59.1%) participants, with a consent rate of 9.2/month. Mean age was 53 years (SD = 16) and 55% were men. Fourteen (25%) participants were lost to follow-up and 33(83%) patients complied with treatment. For per-protocol analysis, the median (IQR) M5T consumed was 6.5 (3.3–19.5) for the vitamin C and 9.0 (1.5–16.0) for placebo group. The median (IQR) naproxen 500 mg tablets consumed was 0 (0–9.8) for the vitamin C group and 20 (0–27) for the placebo arm.

Conclusion

This pilot study supports the feasibility of a larger RCT on the opioid sparing and analgesic properties of vitamin C for acute MSK injured ED patients. Strategies to reduce the refusal and lost to follow-up rates are discussed.

Trial registration number

NCT05555576, ClinicalTrials.Gov PRS.

Effect of glyceryl trinitrate and clevidipine administration on CT angiogram findings in dogs undergoing prostatic artery embolization for prostatic carcinoma

by Maureen A. Griffin, William T. N. Culp, Amandeep S. Chohan, Eric G. Johnson, Michelle A. Giuffrida, Carrie A. Palm, Robert B. Rebhun, Michael S. Kent

Objectives

The primary aim of this study was to evaluate the effects of vasodilator administration on CT angiography (CTA) prostatic artery diameter and peak opacification in dogs with prostatic carcinoma prior to prostatic artery embolization (PAE).

Materials and methods

A prospective clinical trial was performed. Ten dogs with naturally occurring prostatic carcinoma and no evidence of cardiovascular disease were enrolled. Each dog underwent multiphase CTA of the prostate before and after IV vasodilator (glyceryl trinitrate [GTN] or clevidipine butyrate [clevidipine]) administration, and cardiovascular parameters were monitored. PAE was performed the following day. Prostatic arterial anatomy was characterized by CTA. Prostatic artery lumen diameter and peak opacification were measured on pre- and post-vasodilator CTA by a blinded radiologist. The percent change of these measurements was calculated and assessed for significance.

Results

Glyceryl trinitrate and clevidipine were administered in 5 dogs each with subsequent blood pressure reduction documented in all dogs. No significant difference was detected in prostatic artery diameter or peak opacification between pre- vs. post-vasodilator CTA. Good agreement in prostatic arterial branch number, origin, and course was documented between pre- and post-vasodilator CTA images.

Clinical significance

Study findings do not support the routine use of vasodilator administration during pre-PAE CTA in dogs, though larger sample sizes and protocol alterations may be needed to detect a clinically relevant utility.

Childhood trauma, PTSD/CPTSD and chronic pain: A systematic review

by Maria Karimov-Zwienenberg, Wilfried Symphor, William Peraud, Greg Décamps

Background

Despite the growing body of literature on posttraumatic stress disorder (PTSD) and chronic pain comorbidity, studies taking into account the role of childhood exposure to traumatic and adverse events remains minimal. Additionally, it has been well established that survivors of childhood trauma may develop more complex reactions that extend beyond those observed in PTSD, typically categorized as complex trauma or CPTSD. Given the recent introduction of CPTSD within diagnostic nomenclature, the aim of the present study is to describe associations between childhood trauma in relation to PTSD/CPTSD and pain outcomes in adults with chronic pain.

Methods

Following PRSIMA guidelines, a systematic review was performed using the databases Pubmed, PsychInfo, Psychology and Behavioral Sciences Collection, and Web of Science. Articles in English or French that reported on childhood trauma, PTSD/CPTSD and pain outcomes in individuals with chronic pain were included. Titles and abstracts were screened by two authors independently and full texts were consequently evaluated and assessed on methodological quality using JBI checklist tools. Study design and sample characteristics, childhood trauma, PTSD/CPTSD, pain outcomes as well as author’s recommendations for scientific research and clinical practice were extracted for analyses.

Results

Of the initial 295 search records, 13 studies were included in this review. Only four studies explicitly assessed links between trauma factors and pain symptoms in individuals with chronic pain. Findings highlight the long-term and complex impact of cumulative childhood maltreatment (e.g., abuse and neglect) on both PTSD/CPTSD and chronic pain outcomes in adulthood.

Conclusion

This review contributes to current conceptual models of PTSD and chronic pain comorbidity, while adding to the role of childhood trauma and CPTSD. The need for clinical and translational pain research is emphasized to further support specialized PTSD/CPTSD treatment as well as trauma-informed pain management in routine care.