Shorter Symptom Assessment Instruments: The Condensed Memorial Symptom Assessment Scale (CMSAS)

Abstract

Background. Rapid and efficient symptom assessment is an important aspect of palliative care. The objective was to determine whether a smaller number of symptoms from the 32-item Memorial Symptom Assessment Scale Short-Form (MSAS-SF) could convey equivalent quality of life (QOL) information. Methods. Responses from 479 medical oncology patients who completed the MSAS-SF and the Functional Assessment Cancer Therapy (FACT-G) were analyzed. Canonical correlations were performed to assess the relationships of 32 MSAS-SF symptoms to quality of life (FACT-G domains) and clinical variables [age, Karnofsky performance status (KPS), stage of disease, and inpatient status]. The relation of the subscales of the Condensed MSAS (CMSAS) and FACT-G to survival was assessed in a multivariate model. Results. The median age was 67 years (range, 20–89) and median KPS was 80% (range, 20–100). Primary sites were prostate in 141 (29%) patients, lung in 121 (26%) patients, colorectal in 53 (11%) patients, hematologic in 50 (10%) patients, head and neck in 30 (6%) patients and other in 84 (18%) patients. Median survival was 245 days (range, 1–2,215 days). Canonical correlation analyses identified a five-dimensional QOL factor structure. Symptoms important for QOL also correlated significantly with survival and provided the basis for the CMSAS with 14 symptoms and 3 subscales (CMSAS SUM, CMSAS PHYS, and CMSAS PSYCH). In multivariate analyses, the CMSAS PSYCH predicted survival independently of stage, performance status, and QOL. The CMSAS takes 2–4 minutes to complete. Conclusion. The CMSAS contains both QOL and survival information approximately equivalent to the original 32 items.