In vivo measurements of change in tissue oxygen level during irradiation reveal novel dose rate dependence.

Background And Purpose: This study aimed to investigate the radiochemical oxygen depletion (ROD) in vivo by directly measuring oxygen levels in various mouse tissues during ultra-high dose rate (UHDR) irradiation at clinically relevant doses and dose rates.

Materials And Methods: Mice bearing subcutaneous human glioblastoma (U-87 MG) tumors were used for tumor and normal tissue (skin, muscle, brain) measurements. An oxygen-sensitive phosphorescent probe (Oxyphor PtG4) was injected into the tissues, and oxygen levels were monitored using a fiberoptic phosphorometer during UHDR irradiation with a 6 MeV electron linear accelerator (LINAC).

Factors associated with health personnel-chaplain interactions in the hospital setting: a cross-sectional survey study.

Health personnel may seek chaplain support to discuss stressors related to complex patient cases, difficult team dynamics, and personal issues. In this survey study of 1376 healthcare interprofessional clinicians, participants reported interacting with chaplains most frequently over patient-related stressors in the prior 12 months. Factors associated with chaplain interactions to discuss all three stressors included: reporting chaplains provide spiritual support to health personnel, more years of service, seeking professional help to deal with stressors, and higher levels of secondary traumatic stress.

Caregiving During COVID and Beyond: The Experience of Workplace Stress and Chaplain Care Among Healthcare Workers.

Healthcare workers (HCWs) experience occupational stressors that negatively impact emotional well-being and exacerbate turnover intentions. In the wake of the COVID-19 pandemic, the resultant acute care turnover rates have reached an all-time high. In addition, occupational stressors lead to psychological stress, including moral distress, defined as the dissonance between perceiving what the right course of action is and encountering an obstacle to acting accordingly.

Infrared microspectroscopy to elucidate the underlying biomolecular mechanisms of FLASH radiotherapy.

Background: FLASH-radiotherapy (FLASH-RT) is an emerging modality that uses ultra-high dose rates of radiation to enable curative doses to the tumor while preserving normal tissue. The biological studies showed the potential of FLASH-RT to revolutionize radiotherapy cancer treatments. However, the complex biological basis of FLASH-RT is not fully known yet.

Acute Hypoxia Does Not Alter Tumor Sensitivity to FLASH Radiation Therapy.

Purpose: Tumor hypoxia is a major cause of treatment resistance, especially to radiation therapy at conventional dose rate (CONV), and we wanted to assess whether hypoxia does alter tumor sensitivity to FLASH.

Methods And Materials: We engrafted several tumor types (glioblastoma [GBM], head and neck cancer, and lung adenocarcinoma) subcutaneously in mice to provide a reliable and rigorous way to modulate oxygen supply via vascular clamping or carbogen breathing. We irradiated tumors using a single 20-Gy fraction at either CONV or FLASH, measured oxygen tension, monitored tumor growth, and sampled tumors for bulk RNAseq and pimonidazole analysis.