Patients' Perceptions of Virtual Live Music in the Intensive Care Unit.

BACKGROUND: Implementing music in the intensive care unit has increased in popularity because the environment can be stressful and anxiety inducing for many patients. In hospital settings, therapeutic music can be beneficial for patients' well-being and recovery. Although live music typically involves a face-to-face encounter between the musician and patient, the COVID-19 pandemic has prompted a change to virtual live therapeutic music, using technology to present music in real time (eg, with a tablet computer). OBJECTIVE: To generate novel findings regarding patients' perceptions of virtual live therapeutic music, which has been little studied compared with live or recorded music.. METHODS: Fifty patients in Vanderbilt University Medical Center intensive care units listened to virtual live music played by a volunteer musician via an online video communication platform. Patients' responses to 5 survey questions were transcribed and analyzed qualitatively and quantitatively using data analysis software. RESULTS: Seven major themes describing the familiarity and significance of music for patients were identified. Forty-seven patients (94%) experienced positive emotions from the music, 46 (92%) indicated that music was a significant part of their lives, 28 (56%) accessed a cherished memory, and 45 (90%) indicated that they would not change anything. CONCLUSIONS: Therapeutic virtual music was well received and provided tangible benefits to patients. Additional research would provide information on patients' outcomes and differences between live and virtual live music.

Altered Osteoblast Metabolism with Aging Results in Lipid Accumulation and Oxidative Stress Mediated Bone Loss.

Cellular aging is associated with dysfunction of numerous tissues affecting multiple organ systems. A striking example of this is related to age-related bone loss, or osteoporosis, increasing fracture incidence. Interestingly, the two compartments of bone, cortical and cancellous or trabecular, rely on different mechanisms for development and maintenance during 'normal' aging. At a cellular level, the aging process disturbs a multitude of intracellular pathways. In particular, alterations in cellular metabolic functions thereby impacting cellular bioenergetics have been implicated in multiple tissues. Therefore, this study aimed to characterize how metabolic processes were altered in bone forming osteoblasts in aged mice compared to young mice. Metabolic flux analyses demonstrated both stromal cells and mature, matrix secreting osteoblasts from aged mice exhibited mitochondrial dysfunction. This was also accompanied by a lack of adaptability or metabolic flexibility to utilize exogenous substrates compared to osteoblasts cultured from young mice. Additionally, lipid droplets accumulated in both early stromal cells and mature osteoblasts from aged mice, which was further depicted as increased lipid content within the bone cortex of aged mice. Global transcriptomic analysis of the bone further supported these metabolic data as enhanced oxidative stress genes were up-regulated in aged mice, while osteoblast-related genes were down-regulated when compared to the young mice. Collectively, these data suggest that aging results in altered osteoblast metabolic handling of both exogenous and endogenous substrates which could contribute to age-related osteoporosis.

Lipolysis supports bone formation by providing osteoblasts with endogenous fatty acid substrates to maintain bioenergetic status.

Bone formation is a highly energy-demanding process that can be impacted by metabolic disorders. Glucose has been considered the principal substrate for osteoblasts, although fatty acids are also important for osteoblast function. Here, we report that osteoblasts can derive energy from endogenous fatty acids stored in lipid droplets via lipolysis and that this process is critical for bone formation. As such, we demonstrate that osteoblasts accumulate lipid droplets that are highly dynamic and provide the molecular mechanism by which they serve as a fuel source for energy generation during osteoblast maturation. Inhibiting cytoplasmic lipolysis leads to both an increase in lipid droplet size in osteoblasts and an impairment in osteoblast function. The fatty acids released by lipolysis from these lipid droplets become critical for cellular energy production as cellular energetics shifts towards oxidative phosphorylation during nutrient-depleted conditions. In vivo, conditional deletion of the ATGL-encoding gene Pnpla2 in osteoblast progenitor cells reduces cortical and trabecular bone parameters and alters skeletal lipid metabolism. Collectively, our data demonstrate that osteoblasts store fatty acids in the form of lipid droplets, which are released via lipolysis to support cellular bioenergetic status when nutrients are limited. Perturbations in this process result in impairment of bone formation, specifically reducing ATP production and overall osteoblast function.