Delayed signatures of underground nuclear explosions.

Radionuclide signals from underground nuclear explosions (UNEs) are strongly influenced by the surrounding hydrogeologic regime. One effect of containment is delay of detonation-produced radioxenon reaching the surface as well as lengthening of its period of detectability compared to uncontained explosions. Using a field-scale tracer experiment, we evaluate important transport properties of a former UNE site. We observe the character of signals at the surface due to the migration of gases from the post-detonation chimney under realistic transport conditions. Background radon signals are found to be highly responsive to cavity pressurization suggesting that large local radon anomalies may be an indicator of a clandestine UNE. Computer simulations, using transport properties obtained from the experiment, track radioxenon isotopes in the chimney and their migration to the surface. They show that the chimney surrounded by a fractured containment regime behaves as a leaky chemical reactor regarding its effect on isotopic evolution introducing a dependence on nuclear yield not previously considered. This evolutionary model for radioxenon isotopes is validated by atmospheric observations of radioxenon from a 2013 UNE in the Democratic People's Republic of Korea (DPRK). Our model produces results similar to isotopic observations with nuclear yields being comparable to seismic estimates.

Dental status and quality of life in long-term head and neck cancer survivors.

OBJECTIVES: To analyze how the dental status of long-term head and neck cancer survivors affects their subjective quality of life. STUDY DESIGN: Observational case series. METHODS: A convenience sample of 5-year head and neck cancer survivors underwent the following battery of tests: 1) targeted head and neck examination, 2) updated medical history, 3) dental evaluation, 4) standardized quality of life questionnaires. RESULTS: Eighty-six survivors were included in the study. The following associations were identified: 1) those who became edentulous secondary to cancer treatment and those without occlusion at time of the study demonstrated worse Pain, Activity, Recreation/Entertainment, Chewing, Swallowing, Speech, Eating in Public, Normalcy of Diet, Physical Well-Being, Social/Family Well-Being, Functional Well-Being, and Additional Concerns scores; 2) higher Decayed/Missing/Filled scores were associated with worse Pain, Disfigurement, Activity, Recreation/Entertainment, Employment, Chewing, Swallowing, Speech, Eating in Public, Understandability of Speech, Normalcy of Diet, Physical Well-Being, Additional Concerns scores, and weight loss; 3) decreased oral opening measurements were associated with worse Chewing, Swallowing, Eating in Public, Normalcy of Diet, Additional Concerns scores, and weight loss; 4) edentulous survivors who did not use dentures had worse Pain, Activity, Recreation/Entertainment, Understandability of Speech, and Eating in Public scores. CONCLUSIONS: Although previous studies have shown that many of the effects of cancer treatment disappear between 1 and 3 years, this study shows that the dental status has a persistent impact on subjective quality of life.

Speech intelligibility and quality of life in head and neck cancer survivors.

OBJECTIVE: Poor speech intelligibility adversely affects quality of life self-assessment in long term survivors of head and neck cancer treatment. STUDY DESIGN: Observational case series including both objective clinical speech testing and subjective quality of life questionnaire administration. METHODS: Five-year head and neck cancer survivors were recruited to study the association between speech intelligibility and quality of life. Survivors were analyzed as an entire group, and also subdivided into laryngectomees and non-laryngectomees. Objective testing included sentence and word intelligibility. Subjective testing included quality of life questionnaires (UWQOL, FACT, FACT-head and neck, and PSS-HN) and a locally prepared "cancer concern" question. Associations were sought between intelligibility, quality of life and demographics. RESULTS: Sixty-two survivors underwent testing. Lower sentence intelligibility and word intelligibility scores were associated with diminished self-perceived UWQOL Speech (P = .0001 and P = .0001, respectively) and PSS-HN Understandability of Speech (P = .009 and P = .005). Decreased word intelligibility was additionally associated with decreased UWQOL Chewing (P = .003), UWQOL Swallowing (P = .02), UWQOL Recreation (P = .05), PSS-HN Willingness to Eat in Public (P = .03), and PSS-HN Normalcy of Diet (P = .0001). The associations continued even after patients who had undergone laryngectomy were excluded. CONCLUSIONS: Long-term survivors of head and neck cancer continue to have both objective and subjective deficits in speech parameters five years after treatment. Objective deficits are associated with subjective concerns about speech, eating, and recreation. Understanding how communication deficits affect quality of life in long-term head and neck cancer survivors may allow more effective therapies to modulate these concerns in the recovery period.

Aspiration, weight loss, and quality of life in head and neck cancer survivors.

OBJECTIVE: To determine associations between objective assessments (swallowing function and weight change) and subjective quality-of-life (QOL) measures. DESIGN: Observational case series using clinical testing and questionnaires. SETTING: University hospital-based tertiary clinical practice. PATIENTS: Convenience sample of 5-year survivors of head and neck cancer (62 nonlaryngectomy survivors were studied). INTERVENTIONS: Objective testing included examination, weight history, videofluoroscopic swallow studies (VFSS), and oropharyngeal swallowing efficiency (OPSE). Subjective testing included QOL questionnaires (University of Washington Quality-of-Life [UWQOL] Scale, Performance Status Scale for Head and Neck Cancer Patients [PSS-HN], Functional Assessment of Cancer Treatment-General [FACT-G] Scales, and Functional Assessment of Cancer Therapy-Head and Neck [FACT-H&N] Scale). MAIN OUTCOME MEASURES: Aspiration (identified by VFSS), weight change, and QOL measures. RESULTS: Aspiration was associated with the decreased QOL scores in chewing, swallowing, normalcy of diet, and additional concerns of the FACT-H&N Scale. No association was found between aspiration and willingness to eat in public, subjective understandability, or any of the FACT-G scales. Of the nonlaryngectomy survivors, 27 (44%) demonstrated some degree of aspiration during VFSS. Associations were found between aspiration, primary tumor T stage, weight change, and OPSE. Aspirators lost a mean of 10.0 kg from precancer treatment weight, while nonaspirators gained a mean of 2.3 kg (P<.001). Mean OPSE scores were 69 for nonaspirators and 53 for aspirators (P =.01). CONCLUSIONS: Almost half of long-term nonlaryngectomy head and neck cancer survivors demonstrated at least some degree of aspiration. The presence of aspiration is associated with substantial weight loss, advanced initial tumor stage, diminished oropharyngeal swallowing efficiency, and lower scores on a variety of QOL scales.

Quality of life, shoulder range of motion, and spinal accessory nerve status in 5-year survivors of head and neck cancer.

OBJECTIVE: To determine the association of neck dissection and radiation treatment for head and neck cancer (HNC) with subsequent shoulder range of motion (ROM) and quality of life (QOL) in 5-year survivors. DESIGN: A cross-sectional convenience sample. SETTING: Otolaryngology clinics at tertiary care hospital and Veterans Affairs medical center. PATIENTS: Five-year, disease-free survivors of HNC. METHODS: Demographic and cancer treatment information was collected, including type of neck dissection (none, spinal accessory "nerve sparing," and "nerve sacrificing") and radiation. QOL questionnaires were administered, and shoulder ROM was measured. MAIN OUTCOME MEASUREMENTS: University of Washington Quality of Life (UWQOL), Functional Assessment of Cancer Therapy (FACT) Head and Neck, and Performance Status Scale for Head and Neck. Shoulder ROM measurements included abduction, adduction, flexion, extension, internal and external rotation. RESULTS: One hundred and five survivors completed QOL surveys; 85 survivors underwent additional shoulder ROM evaluations. The nerve sacrifice group exhibited significantly poorer scores for UWQOL measures of disfigurement, level of activity, recreation and/or entertainment, speech and shoulder disability, and willingness to eat in public, FACT functional well-being, and FACT Head and Neck (P < .05). Shoulder ROM for flexion and abduction was poorest in the nerve sacrifice group (P < .05). Radiation was associated with significantly worse UWQOL swallowing (P < .05), but no other differences were found for QOL or ROM measurements. Decreased QOL scores were associated with decreased shoulder flexion and abduction (P < .05). Survivors with decreased shoulder abduction had significantly (P < .05) worse scores in disfigurement, recreation and/or entertainment, employment, shoulder disability, and FACT emotional well-being. CONCLUSIONS: Sparing the spinal accessory nerve during neck dissection is associated with significantly less long-term shoulder disability in 5-year survivors of HNC. QOL measures demonstrated the highest level of function in the no dissection group, an intermediate level of functioning with nerve sparing, and poorest function when the nerve is sacrificed. Decreased shoulder flexion and abduction is associated with reduced QOL in long-term survivors of HNC.

Survivorship care plans for patients with head and neck cancer.

OBJECTIVE: To determine the perceived value of survivorship care plans (SCPs) (cancer treatment summaries and follow-up recommendations). DESIGN: Survey of patients and their physicians between 3 and 4 years after receipt of the SCP. SETTING: Ambulatory, tertiary care medical center. PATIENTS: A convenience sample of head and neck cancer survivors living 3 years after each had been mailed a personal SCP shortly after completion of cancer treatment. Twenty survivors were contacted, and all agreed to participate. INTERVENTIONS: Institutional review board-approved, scripted telephone survey to determine whether patients and their primary care physicians still had their SCPs and found them useful. MAIN OUTCOME MEASURES: Survey responses. RESULTS: Only 2 of 20 survivors and 11 of 21 physicians or dentists were able to locate or remember having received the SCPs 3 years later. Eighteen of 20 survivors were unsure of the value of SCPs. CONCLUSIONS: Despite a widely held belief that patients benefit from receiving SCPs, our initial attempt found little awareness of these documents by either the head and neck cancer survivors or their primary care physicians.

Psychosocial effects in long-term head and neck cancer survivors.

BACKGROUND: To identify and rate the importance of several psychosocial and physiologic influences on quality of life (QOL) among a cohort of 5-year head and neck cancer survivors, we conducted a cross-sectional study of a convenience sample that used both questionnaires and physiologic evaluations. METHODS: QOL was assessed by the Functional Assessment of Cancer Therapy (FACT) and the FACT Head and Neck additional concerns (FACT-H&N) questionnaires. Psychosocial characteristics (or risk factors) potentially influencing QOL were measured by the Millon Behavioral Health Inventory (MBHI) and the Social Support Questionnaire (SSQSR). Physiologic risk factors were measured in examinations that included shoulder and neck range of motion, whole and stimulated saliva measurements, and oropharyngeal swallowing efficiency. We evaluated the association of selected QOL measures with three groups of potential risk factors: psychosocial factors, consisting of selected MBHI and SSQSR scales; physiologic factors, consisting of selected physical ability measures; and a combination of psychosocial/physiologic factors. RESULTS: The entire study population of 105 subjects completed the FACT and FACT-H&N questionnaires; 86 of these completed the physiologic tests as well. Combined psychosocial/physiologic models best predicted all QOL measures considered. Psychosocial models alone, compared with physiologic models alone, better predicted FACT physical and social/family well-being measures. Physiologic models alone, compared with psychosocial models alone, better predicted FACT-H&N additional concerns measures. Premorbid pessimism (MBHI) was consistently the best predictor of QOL measures. CONCLUSIONS: Both psychosocial and physiologic factors influence QOL in patients with head and neck cancer, but many QOL measures are most strongly influenced by psychosocial considerations. Physicians and surgeons caring for long-term head and neck cancer survivors should be cognizant of the importance of psychosocial risk factors in the QOL of their patients.