Loneliness and quality of life after head and neck cancer.

Loneliness is associated with a poor quality of life, mental illness, poor physical health, and premature mortality. Patients with head and neck cancer (HNC) are at risk of loneliness because of the effects of the disease and its treatment on important social interactive functions such as appearance, speech, facial expression, and eating. Patients treated for primary squamous cell HNC between January 2015 and December 2016 were surveyed in early 2019 using the University of Washington quality of life questionnaire version 4, the Cancer-related Loneliness Assessment Tool (C-LAT), and four nationally recommended indicator questions. The survey comprised 140 patients, with a mean (standard deviation) age at diagnosis of 63 (11) years. Tumour sites were oropharyngeal (42%), oral (35%), laryngeal (14%), and elsewhere (9%). In response to the question "How often do you feel lonely?" three-quarters said "hardly ever" and only 6% "often". Similar responses were obtained for the other three indicator questions. It is encouraging that a relatively small proportion had serious issues with loneliness. Similarly, responses to the C-LAT suggested that one-quarter had feelings of loneliness and a minority had serious problems. Patients who were younger, who lived in more deprived circumstances, who had advanced disease and had been treated with chemotherapy or radiotherapy reported greater levels of loneliness. Loneliness was associated with a worse overall quality of life, and worse physical and social-emotional function. Lonely patients need to be identified as early as possible so that support and interventions can be implemented and outcomes improved.

Development of the cancer-related loneliness assessment tool: Using the findings of a qualitative analysis to generate questionnaire items.

The aim of this research was to develop a tool to identify and assess the qualities of cancer-related loneliness in adult cancer survivors who have completed treatment. In addition to reporting the development of the tool, we explicate the process of using the findings of a qualitative analysis to generate questionnaire items, as currently little guidance exists on this topic. The findings of our qualitative research exploring the experience of loneliness in adult cancer survivors who had completed treatment, together with the findings of our concept analysis of loneliness, were used to develop an assessment tool for cancer-related loneliness following treatment completion. Cognitive testing was undertaken to assess fidelity of comprehension and feasibility in administration. The Cancer-Related Loneliness Assessment Tool is a 10-item self-report questionnaire capturing the essential elements of cancer-related loneliness following treatment completion. Experts believed the questionnaire to be face-valid and usable in clinical practice, and preliminary cognitive testing indicated that the items generate the information intended and individuals have little trouble completing the tool. Following further development work, the tool could be employed to identify cancer-related loneliness following treatment completion. It could also aid with the development/adaptation and evaluation of person-centred interventions to address such loneliness.

Time-reversed sound beams of finite amplitude.

Numerical simulations based on the nonlinear parabolic wave equation are used to investigate time reversal of sound beams radiated by unfocused and focused sources. Emphasis is placed on nonlinear propagation distortion in the time-reversed beam, and specifically its effect on field reconstruction. Distortion of this kind, due to amplification during time reversal, has been observed in recent experiments [A. P. Brysev et al., Acoust. Phys. 44, 641-650 (1998)]. Effects of diffraction introduced by time-reversal mirrors with finite apertures are also considered. It is shown that even in the presence of shock formation, the ability of time reversal to retarget most of the energy on the source or focal region of the incident beam is quite robust.