Publications by authors named "Shannon MacDonald"

We aimed to understand how experiences with vaccine-related information and communication challenges during the COVID-19 pandemic impacted motivations and behaviors among Canadian adults regarding future vaccines. Semi-structured interviews were conducted with participants purposively selected to ensure diversity in age, sex at birth, self-identified gender, and region. Data were analyzed using thematic analysis; findings were mapped to the Information-Motivation-Behavioral Skills Model focusing on factors affecting vaccine hesitancy and uptake.

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Background: Despite high COVID-19 vaccine coverage in Canada, vaccine acceptance and preferred delivery among newcomers, racialized persons, and those who primarily speak minority languages are not well understood. This national study explores COVID-19 vaccine acceptance, access to vaccines, and delivery preferences among ethnoculturally diverse population groups.

Methods: We conducted two national cross-sectional surveys during the pandemic (Dec 2020 and Oct-Nov 2021).

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Background: The role of preoperative radiation therapy (RT) in the management of retroperitoneal sarcomas (RPS) remains controversial. A legitimate concern is the potential for worse outcomes after surgery for RPS with preoperative RT.

Objective: The purpose of this study was to evaluate the impact of preoperative (± intraoperative) RT on postoperative complications in patients undergoing surgery for RPS.

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Background: The outcome for pediatric patients with high-grade glioma (HGG) remains poor. Veliparib, a potent oral poly(adenosine diphosphate-ribose) polymerase (PARP) 1/2 inhibitor, enhances the activity of radiotherapy and DNA-damaging chemotherapy.

Methods: We conducted a single-arm, non-randomized phase 2 clinical trial to determine whether treatment with veliparib and radiotherapy, followed by veliparib and temozolomide, improves progression-free survival in pediatric patients with newly diagnosed HGG without H3 K27M or BRAF mutations compared to patient level data from historical cohorts with closely matching clinical and molecular features.

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Article Synopsis
  • The study aimed to evaluate a web-based intervention using personalized avatars to improve understanding of community immunity (herd immunity) and its impact on individuals' risk perception regarding vaccine-preventable diseases like measles and influenza.
  • Researchers developed an interactive application where users create avatars that represent themselves and others in their community, which illustrates how infections spread with and without community immunity.
  • The trial with 3883 Canadian adults found that participants who used the web application showed improved risk perception, motivations, and emotions related to vaccination compared to those in a control group, validating the effectiveness of the intervention.
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The purpose of this study was to better understand barriers and enabling conditions for HPV vaccination in school-based vaccination programs in Canada. Semi-structured interviews were conducted by telephone or in person with parents, nurses, and school staff (n = 50) in three Canadian provinces. Interviews explored views on HPV and HPV vaccination, strengths and weaknesses of the school-based HPV vaccination programs and proposed interventions to increase uptake.

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Purpose: The literature on skull base chondrosarcoma (CHS) is scarce. We report outcomes for pediatric and young patients ≤22 years with base of skull CHSs treated with proton-based radiation therapy (PBRT).

Methods And Materials: We retrospectively reviewed all patients treated with PBRT between 1981 and 2023.

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Purpose/objectives: The indications, techniques, and extent to which proton beam therapy (PBT) is employed for breast cancer are unknown. We seek to determine PBT utilization for breast cancer.

Materials/methods: The Particle Therapy Co-Operative Group (PTCOG) Breast Subcommittee developed an IRB-approved 29-question survey and sent it to breast cancer radiation oncologists at all active PBT centers worldwide in June 2023.

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Article Synopsis
  • Telemedicine enables remote communication between healthcare providers and patients through video or phone calls, gaining popularity during the pandemic for its convenience.* -
  • It benefits pediatric patients by allowing family involvement during consultations and helps save time by eliminating travel and childcare needs.* -
  • The approach is particularly advantageous for cancer patients and immunocompromised individuals by reducing exposure risks, and although challenges remain, telemedicine is expected to become more accessible globally.*
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HPV vaccination is one of the safest and most effective interventions against HPV-related cancers. From 2013 to 2018, HPV vaccination was piloted in Ghana in preparation for a national program. Yet, at the time of this study, there was no publicly funded HPV vaccination program in Ghana.

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Article Synopsis
  • Streptococcus pneumoniae causes high illness and death rates globally, particularly in children under 5, leading to the importance of pneumococcal conjugate vaccines (PCV) in Canada's public health initiatives.
  • Regional variability in vaccination delivery exists in Canada despite national recommendations from the National Advisory Committee on Immunization (NACI), leading to complexities in addressing the needs of at-risk groups, especially Indigenous children.
  • As of March 2023, only a few provinces acknowledge Indigenous children as "high risk," with differing vaccine schedules; future improvements in PCV programs need clearer and more inclusive policies to ensure equitable health outcomes.
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Objective: Hospitalized children are a potentially underimmunized population. We sought to determine the proportion of patients admitted to our pediatric medicine inpatient units who are underimmunized or unimmunized and to identify barriers to immunization faced by families of children admitted to hospital.

Methods: We conducted a prospective study of children aged 2 months to 18 years admitted to our pediatric medicine inpatient units between July 2021 and October 2022.

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Identifying effective interventions to promote children's vaccination acceptance is crucial for the health and wellbeing of communities. Many interventions can be implemented to increase parental awareness of the benefits of vaccination and positively influence their confidence in vaccines and vaccination services. One potential approach is using narratives as an intervention.

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Background: Vaccine hesitancy is a significant threat to public health. Healthcare providers (HCPs) can address hesitancy during routine patient conversations; however, few multidisciplinary education tools exist for HCPs to learn to engage in vaccine discussion especially considering new vaccine technologies such as mRNA vaccines. The objectives of this study were to explore HCP learners' experiences with COVID-19 vaccine communication, and qualitatively evaluate an online learning module composed of virtual simulation games (VSGs) which utilize the PrOTCT Framework for HCP vaccine communication.

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Background: Maternal depression and anxiety can have a detrimental impact on birth outcomes and healthy child development; there is limited knowledge on its influence on immunization schedule adherence. Therefore, the objectives of this study were to determine the impact of maternal depression and anxiety in the perinatal period on prolonged vaccine delay of childhood vaccines.

Methods: In this prospective cohort study, we analyzed linked survey and administrative data of 2,762 pregnant women in Calgary, Alberta, Canada.

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Background: Prognosis for patients with high-risk neuroblastoma (HR-NBL) is guarded despite aggressive therapy, and few studies have characterized outcomes after radiotherapy in relation to radiation treatment fields.

Methods: Multi-institutional retrospective cohort of 293 patients with HR-NBL who received autologous stem cell transplant (ASCT) and EBRT between 1997-2021. LRR was defined as recurrence at the primary site or within one nodal echelon beyond disease present at diagnosis.

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Objective: Surgery for primary tumors of the mobile spine and sacrum often requires complex reconstruction techniques to cover soft-tissue defects and to treat wound and CSF-related complications. The anatomical, vascular, and immunoregulatory characteristics of the omentum make it an excellent local substrate for the management of radiation soft-tissue injury, infection, and extensive wound defects. This study describes the authors' experience in complex wound reconstruction using pedicled omental flaps to cover defects in surgery for mobile spine and sacral primary tumors.

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Background: Little is known about human papillomavirus (HPV) vaccination among immigrant children in Canada. We conducted a study in Alberta, Canada to assess HPV vaccine coverage among school-aged immigrant children compared with non-immigrant children.

Methods: This cohort study analysed population-based linked administrative health data to measure HPV vaccine coverage for 346 749 school-aged children, including 31 656 immigrants.

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Purpose: Our purpose was to evaluate the measurement properties of patient-reported outcome (PRO) measures used in the ongoing RadComp pragmatic randomized clinical trial (PRCT).

Methods And Materials: The deidentified and blinded data set included 774 English-speaking female participants who completed their 6-month posttreatment assessment. Eleven PRO measures were evaluated, including the Trial Outcome Index from the Functional Assessment of Cancer Therapy-Breast (FACT-B), Satisfaction with Breast Cosmetic Outcomes, the BREAST-Q, and selected Patient-Reported Outcomes Measurement Information System (PROMIS) measures.

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Background: Sex impacts individuals' response to vaccination. However, most vaccine studies do not report these differences disaggregated by sex. The aim of this study was to assess sex differences in the immunogenicity and efficacy of influenza vaccine.

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Study Design: Retrospective study.

Objective: The objective of this study was to report the clinical data for patients treated with mobile spine chondrosarcoma.

Summary Of Background Data: Chondrosarcoma of the mobile spine is a rare and challenging entity.

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Objective: Successful clinical conversations about vaccination in pregnancy (pertussis, COVID-19, and influenza) are key to improving low uptake rates of both vaccination in pregnancy and infancy. The purpose of this study was to understand Canadian perinatal care providers' knowledge, attitudes, and practices around vaccination in pregnancy.

Methods: Qualitative interviews with 49 perinatal care providers (nurse practitioner, general practitioner, registered nurse, registered midwife, obstetrician-gynecologist, and family physicians) in 6 of 13 provinces and territories were deductively coded using directed content analysis [1] and analyzed according to key themes.

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