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Radiation exposure and the effect of anti-scatter grids are not well studied in premature infants during transcatheter patent ductus arteriosus closure.
This study aimed to investigate whether the use of anti-scatter grids altered the level of radiation exposure to premature infants undergoing transcatheter patent ductus arteriosus closure.
Methods and Results:
Demographic and radiation exposure data for premature infants who underwent transcatheter patent ductus arteriosus closure at the Stead Family Children’s Hospital from 10/2019 to 10/2021 were retrospectively reviewed and analyzed. Twenty-four patients (41%) underwent transcatheter patent ductus arteriosus closure with anti-scatter grids, while 34 (59%) underwent the procedure without using anti-scatter grids. At the time of catheterization, the median age, corrected age, and weight were 4.3 weeks (3.4–6), 29 weeks (28.1–30.9), and 1200g (1000-1600), respectively. Total radiation exposures for the dose area product and air kerma were 2.73 µGy.m2 (1.65–4.16), and 1.63 mGy (1.15–2.58), respectively. Radiation doses were higher in the group in whom the anti-scatter grids were utilized with dose area product of 3.33 µGy.m2 (2.39–5.43) and air kerma of 2.27 mGy (1.41–3.06) versus 1.86 µGy.m2 (1.46–3.60) and air kerma of 1.40 mGy (1.08–1.92). When radiation doses were adjusted to the radiation time, no difference in radiation exposure was noticed between the groups.
Conclusions:
Transcatheter patent ductus arteriosus closure in premature infants can be safely performed with minimal radiation exposure. In the authors’ laboratory, the use of anti-scatter grids does not impact radiation exposure in premature infants.
Radiotherapy (RT) plays a key role in the tumour microenvironment (TME), impacting the immune response via cellular and humoral immunity. RT can induce local immunity to modify the TME. It can stimulate dendritic cell maturation and T-cell infiltration. Moreover, B cells, macrophages and other immune cells may also be affected. Tertiary lymphoid structure (TLS) is a unique structure within the TME and a class of aggregates containing T cells, B cells and other immune cells. The maturation of TLS is determined by the presence of mature dendritic cells, the density of TLS is determined by the number of immune cells. TLS maturation and density both affect the antitumour immune response in the TME. This review summarized the recent research on the impact and the role of RT on TLS, including the changes of TLS components and formation conditions and the mechanism of how RT affects TLS and transforms the TME. RT may promote TLS maturation and density to modify the TME regarding enhanced antitumour immunity.
Edited by
Laurie J. Mckenzie, University of Texas MD Anderson Cancer Center, Houston,Denise R. Nebgen, University of Texas MD Anderson Cancer Center, Houston
The incidence of cancer during gestation has risen due to multiple factors such as advanced maternal age and improvement in cancer treatment, which has resulted in longer life span and a rising number of survivors who will then become pregnant. Whether a woman is diagnosed with cancer during pregnancy or becomes pregnant after surviving the disease, navigating treatment for both the mother and the fetus can seem daunting for patients as well as their care providers, as there is a higher risk of morbidity for these patients. This chapter aims to describe safe diagnostic and therapeutic options during pregnancy and includes special considerations regarding survivors’ treatment. Breast cancer, lymphoma, leukemia and cervical cancer are the focus of the chapter and obstetric management of patients with these malignancies is addressed, including antenatal care, delivery considerations and breastfeeding.
Edited by
Laurie J. Mckenzie, University of Texas MD Anderson Cancer Center, Houston,Denise R. Nebgen, University of Texas MD Anderson Cancer Center, Houston
Improvements in multimodality treatment of anal and colorectal cancer has led to increased numbers of women survivors who experience gynecologic problems in long-term survivorship. The etiology of gynecologic problems after anal and colorectal cancer treatment is complex and multifactorial. Pelvic radiation, surgery and chemotherapy can all cause anatomic, hormonal and psychological changes. Consideration of preventative measures can ideally reduce the risk of vaginal stenosis, dyspareunia, sexual dysfunction, infertility, premature menopause and pelvic pain after therapy. Proactive screening and appropriate treatment of cancer therapy late effects can improve patients’ quality of life during survivorship.
Edited by
Laurie J. Mckenzie, University of Texas MD Anderson Cancer Center, Houston,Denise R. Nebgen, University of Texas MD Anderson Cancer Center, Houston
Premature ovarian insufficiency (POI) is a heterogeneous diagnosis caused by a multitude of factors including genetic, autoimmune, iatrogenic, social, and environmental. It is defined as loss of ovarian function prior to 40 years of age with subsequent secondary amenorrhea for at least 4−6 months in conjunction with elevated follicle stimulating hormone levels on two different measurements. Prompt recognition of symptoms should encourage thorough history-taking and work-up, as some causes of POI are associated with conditions requiring additional screening or medical management. Early initiation of hormone replacement therapy is necessary to prevent long-term sequelae from chronic hypoestrogenism such as cardiovascular events, poor bone health, and cognitive dysfunction. Extensive counseling with regards to future fertility and family building options is necessary as the diagnosis of POI can be psychologically devastating to many women.
Presents snowmelt, discussing energy flux, physical propertirs of snow, metamorphism of snowpack, rate of snowmelt, energy exchange mechanisms, turbulent convection, snowmwlt runoff generation, and snow-covered areas.
The war in Ukraine raises concerns for potential hazards of radiological and nuclear incidents. Children are particularly vulnerable in these incidents and may need pharmaceutical countermeasures, including antidotes and cytokines. Searches found no published study comparing pediatric indications and dosing among standard references detailing pediatric medications for these incidents. This study addresses this gap by collecting, tabulating, and disseminating this information to healthcare professionals caring for children. Expert consensus chose the following references to compare their pediatric indications and dosing of medical countermeasures for radiation exposure and internal contamination with radioactive materials: Advanced Hazmat Life Support (AHLS) for Radiological Incidents and Terrorism, DailyMed, Internal Contamination Clinical Reference, Medical Aspects of Radiation Incidents, and Medical Management of Radiological Casualties, as well as Micromedex, POISINDEX, and Radiation Emergency Medical Management (REMM). This is the first study comparing pediatric indications and dosing for medical countermeasures among commonly used references for radiological and nuclear incidents.
Neoadjuvant radiotherapy (RT) is commonly used as standard treatment for rectal cancer. However, response rates are variable and survival outcomes remain poor, highlighting the need to develop new therapeutic strategies. Research is focused on identifying novel methods for sensitising rectal tumours to RT to enhance responses and improve patient outcomes. This can be achieved through harnessing tumour promoting effects of radiation or preventing development of radio-resistance in cancer cells. Many of the approaches being investigated involve targeting the recently published new dimensions of cancer hallmarks. This review article will discuss key radiation and targeted therapy combination strategies being investigated in the rectal cancer setting, with a focus on exploitation of mechanisms which target the hallmarks of cancer.
Interest in nuclear power as a cleaner and alternative energy source is increasing in many countries. Despite the relative safety of nuclear power, large-scale disasters such as the Fukushima Daiichi (Japan) and Chernobyl (Ukraine) meltdowns are a reminder that emergency preparedness and safety should be a priority. In an emergency situation, there is a need to balance the tension between a rapid response, preventing harm, protecting communities, and safeguarding workers and responders. The first line of defense for workers and responders is personal protective equipment (PPE), but the needs vary by situation and location. Better understanding this is vital to inform PPE needs for workers and responders during nuclear and radiological power plant accidents and emergencies.
Study Objective:
The aim of this study was to identify and describe the PPE used by different categories of workers and responders during nuclear and radiological power plant accidents and emergencies.
Methods:
A systematic literature review format following the PRISMA 2020 guidelines was utilized. Databases SCOPUS, PubMed, EMBASE, INSPEC, and Web of Science were used to retrieve articles that examined the PPE recommended or utilized by responders to nuclear radiological disasters at nuclear power plants (NPPs).
Results:
The search terms yielded 6,682 publications. After removal of duplicates, 5,587 sources continued through the systematic review process. This yielded 23 total articles for review, and five articles were added manually for a total of 28 articles reviewed in this study. Plant workers, decontamination or decommissioning workers, paramedics, Emergency Medical Services (EMS), emergency medical technicians, military, and support staff were the categories of responders identified for this type of disaster. Literature revealed that protective suits were the most common item of PPE required or recommended, followed by respirators and gloves (among others). However, adherence issues, human errors, and physiological factors frequently emerged as hinderances to the efficacy of these equipment in preventing contamination or efficiency of these responders.
Conclusion:
If worn correctly and consistently, PPE will reduce exposure to ionizing radiation during a nuclear and radiological accident or disaster. For the best results, standardization of equipment recommendations, clear guidelines, and adequate training in its use is paramount. As fields related to nuclear power and nuclear medicine expand, responder safety should be at the forefront of emergency preparedness and response planning.
It can be painful to witness the toll of cervical cancer on women offered next-to-no treatment options. Persons with cervixes who acquire the disease in places like Africa or Southeast Asia often experience a brutal life trajectory. In the absence of highly trained professionals, sophisticated medical facilities, and expensive surgical or radiation equipment, most cervical cancer patients in lower-income countries are sent home to die. These deaths can be protracted and lonely, with little access to palliative care. What’s more, the stigma of the disease – associated with “dirty” female reproductive organs and the smell of advanced cancer – can lead to social banishment in a sufferer’s final days. In higher-income countries, greater availability of treatment is still no guarantee of equity. Low-income patients in the United States are often cut off from insurance once cancer goes into remission, excluding them from critical follow-up. Pockets of inequity, the rural–urban divide, and inconsistent access to care mean women from affluent countries die inexcusably from a preventable cancer. The inhumane circumstances cervical cancer sufferers face worldwide remind us of this mission’s urgency.
Every year, more than 600,000 persons with cervixes end up with cervical cancer. Without treatment, these people will die. And yet, treatment for cervical cancer remains is scarce enough in lower-income countries to typically make a cervical cancer diagnosis a terminal one. Women who can’t afford to travel for their treatment are left to die painful, lonely deaths, stigmatized, and with next-to-no palliative care. In higher-income countries, surgery, radiation, chemotherapy, as well as immunotherapy can prolong or even save lives. But these treatments can be arduous and even torturous, with life-altering consequences, such as loss of fertility and physical disfigurement, along with chronic or debilitating health conditions and radical lifestyle changes. In affluent regions, treatment is often seen as a last-ditch option, while marginalized women around the globe consider it a luxury. Cervical cancer prevention is the most cost-effective, sustainable, and humane approach toward eliminating the disease. But until treatment can be offered equitably alongside prevention, thousands more will suffer and die.
Development of medical countermeasures (MCM) to mitigate and/ or treat the pulmonary complications associated with exposure to chemical, radiological, and/ or nuclear weapons is a national, public health preparedness posture priority in the United States (US). Pulmonary exposure to either sulfur mustard vapor or radiation causes oxidative damage, vascular injury, hyperinflammation, and pro-fibrotic signaling cascades that lead to life-threatening and potentially debilitating lung disease. There is no MCM currently approved by the US Food and Drug Administration (FDA) to mitigate and/ or treat lung injury caused by sulfur mustard or radiation exposure. Thus, there remains a major unmet public health need for development of threat-agnostic, host-directed therapeutics that target common pathophysiological mechanisms underlying the progression of acute and/ or late lung injury independent of the etiology of disease. This review describes the clinical manifestations and underlying mechanisms of sulfur mustard and radiation-induced lung injury and regulatory considerations for MCM development under the non-traditional Animal Rule pathway.
Identification of paediatric coronary artery abnormalities is challenging. We studied whether coronary artery CT angiography can be performed safely and reliably in children.
Materials:
Retrospective analysis of consecutive coronary CT angiography scans was performed for image quality and estimated radiation dose. Both factors were assessed for correlation with electrocardiographic-gating technique that was protocoled on a case-by-case basis, radiation exposure parameters, image noise artefact parameters, heart rate, and heart rate variability.
Results:
Sixty scans were evaluated, of which 96.5% were diagnostic for main left and right coronaries and 91.3% were considered diagnostic for complete coronary arteries. Subjective image quality correlated significantly with lower heart rate, increasing patient age, and higher signal-to-noise ratio. Estimated radiation dose only correlated significantly with choice of electrocardiographic-gating technique with median doses as follows: 2.42 mSv for electrocardiographic-gating triggered high-pitch spiral technique, 5.37 mSv for prospectively triggered axial sequential technique, 3.92 mSv for retrospectively gated technique, and 5.64 mSv for studies which required multiple runs. Two scans were excluded for injection failure and one for protocol outside the study scope. Five non-diagnostic cases were attributed to breathing motion, scanning prior to peak contrast enhancement, or scan acquisition during the incorrect portion of the R-R interval.
Conclusions:
Diagnostic-quality coronary CT angiography can be performed reliably with a low estimated radiation exposure by tailoring each scan protocol to the patient’s body habitus and heart rate. We propose coronary CT angiography is a safe and effective diagnostic modality for coronary artery abnormalities in children.
Pulmonary injury induced by mustard vesicants and radiation is characterized by DNA damage, oxidative stress, and inflammation. This is associated with increases in levels of inflammatory mediators, including tumor necrosis factor (TNF)α in the lung and upregulation of its receptor TNFR1. Dysregulated production of TNFα and TNFα signaling has been implicated in lung injury, oxidative and nitrosative stress, apoptosis, and necrosis, which contribute to tissue damage, chronic inflammation, airway hyperresponsiveness, and tissue remodeling. These findings suggest that targeting production of TNFα or TNFα activity may represent an efficacious approach to mitigating lung toxicity induced by both mustards and radiation. This review summarizes current knowledge on the role of TNFα in pathologies associated with exposure to mustard vesicants and radiation, with a focus on the therapeutic potential of TNFα-targeting agents in reducing acute injury and chronic disease pathogenesis.
Provides an overview of the categories of cancer treatment modalities consisting of chemotherapy, stem cell transplant, hormone, immunotherapy, radiation, targeted cell therapy
Provides an overview of the categories of cancer treatment modalities consisting of chemotherapy, stem cell transplant, hormone, immunotherapy, radiation, targeted cell therapy
Provides an overview of the categories of cancer treatment modalities consisting of chemotherapy, stem cell transplant, hormone, immunotherapy, radiation, targeted cell therapy
Provides an overview of the categories of cancer treatment modalities consisting of chemotherapy, stem cell transplant, hormone, immunotherapy, radiation, targeted cell therapy
Provides an overview of the categories of cancer treatment modalities consisting of chemotherapy, stem cell transplant, hormone, immunotherapy, radiation, targeted cell therapy
Provides an overview of the categories of cancer treatment modalities consisting of chemotherapy, stem cell transplant, hormone, immunotherapy, radiation, targeted cell therapy