Condensed Memorial Symptom Assessment Scale (CMSAS)

Abstract

The Condensed Memorial Symptom Assessment Scale (CMSAS) is a brief, 14-item clinical inventory designed for the rapid assessment of patient symptom burden. It serves as a validated, shortened version of the Memorial Symptom Assessment Scale – Short Form (MSAS-SF). Developed in response to the growing acceptance of the biopsychosocial model in healthcare, the CMSAS aims to quickly measure the frequency, severity, and associated distress across 32 multidimensional symptoms, focusing on core physical and psychological manifestations often experienced by patients with serious illness.

The CMSAS is particularly valuable for clinicians and researchers in oncology and palliative care settings who require an accurate, multi-dimensional measure of patient quality of life (QoL) that minimizes respondent burden while maintaining robust psychometric integrity.

Keywords

Condensed Memorial Symptom Assessment Scale, CMSAS, MSAS-SF, symptom assessment, quality of life, palliative care, symptom distress, oncology, biopsychosocial model, psychometrics.

Authors

Chang, V. T., Hwang, S. S., Kasimis, B., & Thaler, H. T.

Purpose

The primary purpose of the CMSAS is to provide clinicians with an efficient and accurate multi-dimensional tool for measuring patient well-being and symptom burden. This measure is essential for monitoring patient status in clinical trials and for guiding clinical interventions in settings like palliative care, where rapid identification of distressing physical and psychological symptoms is critical for timely management.

The CMSAS is a 14-item inventory that measures the subjective experience of symptoms over the preceding seven days. By quantifying both the frequency of psychological symptoms and the distress caused by physical symptoms, the scale allows for a nuanced understanding of the patient’s overall symptom profile, supporting the comprehensive approach mandated by the biopsychosocial model of health.

Construct

The CMSAS measures the complex construct of multi-dimensional symptom burden and its resulting distress. This construct recognizes that patient well-being is not solely determined by the presence of symptoms but also by their subjective impact on daily functioning and emotional state. The tool assesses 32 symptoms inherent in the MSAS framework through its condensed item set.

The scale employs distinct scoring rules to yield three primary subscales derived from the parent MSAS-SF instrument: the Physical Symptom Subscale (MSAS-PHYS), the Psychological Symptom Subscale (MSAS-PSYCH), and the Global Distress Index (MSAS-GDI). The MSAS-GDI represents an overall measure of symptom distress, integrating 4 psychological symptoms (frequency) and 6 physical symptoms (distress), reflecting the holistic nature of the measured construct.

Validity

The validity of the Condensed Memorial Symptom Assessment Scale (CMSAS) is rooted in its strong correlation with the previously validated Memorial Symptom Assessment Scale – Short Form (MSAS-SF). The validation study by Chang, Hwang, Kasimis, & Thaler (2004) focused on demonstrating that the 14-item version maintains the clinical relevance and multi-dimensional structure necessary for accurate symptom assessment, particularly within oncology populations.

High concurrent validity is established by ensuring that the CMSAS subscale scores (GDI, PHYS, PSYCH) correlate significantly with those calculated using the full MSAS-SF, confirming that the condensed version remains a valid measure of overall symptom distress and domain-specific symptom severity. This robust foundation ensures the CMSAS is a clinically appropriate measure for assessing changes in patient well-being over time.

Reliability

The psychometric properties of the CMSAS, including its reliability, are discussed extensively in the key reference (Chang et al., 2004). Reliability analyses typically focus on the internal consistency of the derived subscales, ensuring that the items grouped together consistently measure the same underlying dimension (e.g., physical distress or psychological frequency).

The complexity of the CMSAS scoring—which uses different scaling increments (0.8 for physical distress and 1.0 for psychological frequency) and different anchor points for symptom presence—requires careful validation to ensure high inter-item reliability within each subscale. The reliance on the MSAS-SF framework suggests that the CMSAS maintains the strong reliability characteristics established for the parent instrument.

Factor Analysis

The factor structure of the CMSAS is inherited from and consistent with the multi-dimensional structure established for the MSAS-SF. This structure supports the differentiation between physical and psychological symptom clusters, which are measured independently.

The scoring procedure inherently reflects this factor separation: the MSAS-PHYS subscale averages the distress scores of 12 prevalent physical symptoms, while the MSAS-PSYCH subscale averages the frequency scores of 6 prevalent psychological symptoms. The overarching Global Distress Index (MSAS-GDI) acts as a composite score, demonstrating that while the symptoms cluster into distinct domains, they contribute holistically to the patient’s overall distress experience.

Instrument

Test Type: Symptom burden inventory; Patient-reported outcome measure (PROM).

Format: 14 items, utilizing a 5-point Likert-type scale. Physical symptoms are rated based on distress (0-4 scale with 0.8 increments for calculation), and psychological symptoms are rated based on frequency (0-4 scale with 1.0 increments for calculation).

Language Available: Originally validated in English. Other language versions may exist based on the MSAS-SF translations.

Population Group: Clinical populations experiencing serious or chronic illness, primarily oncology patients and those receiving palliative care.

Age Group: Adults (typically 18+).

Population Details: Used to assess the subjective experience of physical and emotional symptoms that impact quality of life due to disease or treatment.

Test Methodology: Self-administered questionnaire, typically covering symptoms experienced over the past seven days.

Keywords

Symptom burden, MSAS-GDI, MSAS-PHYS, MSAS-PSYCH, physical symptoms, psychological symptoms, distress measurement, oncology, symptom management, psychometric properties.

Authors

Author ORCID Identifier: Information not provided in source content.

Affiliation Email addresses: Information not provided in source content.

Correspondence Address: Information not provided in source content.

Permissions & Fee and Test Year

The Condensed Memorial Symptom Assessment Scale (CMSAS) was formally introduced and validated in 2004. As it is derived from the Memorial Symptom Assessment Scale (MSAS), which is typically associated with Memorial Sloan Kettering Cancer Center, users seeking administration permissions or information regarding licensing fees should contact the original authors or the developing institution directly.

Test Year: 2004.

Reference’s

Chang, V. T., Hwang, S. S., Kasimis, B., & Thaler, H. T. (2004). Shorter Symptom Assessment Instruments: The Condensed Memorial Symptom Assessment Scale (CMSAS). Cancer Investigation, 22(4), 526–536.

Items of the Condensed Memorial Symptom Assessment Scale (CMSAS)

The CMSAS is divided into two sections: assessment of symptom distress (primarily physical symptoms) and assessment of symptom frequency (primarily psychological symptoms). Scoring weights differ between the two sections.

How much did this symptom bother or distress you in the past 7 days?

Symptom	Present	Not at all	A little Bit	Some what	Quite a bit	Very much
Lack of energy*	Y     N	0	1	2	3	4
Lack of appetite*	Y     N	0	1	2	3	4
Pain*	Y     N	0	1	2	3	4
Dry mouth*	Y     N	0	1	2	3	4
Weight Loss*	Y     N	0	1	2	3	4
Feeling drowsy*	Y     N	0	1	2	3	4
Shortness of breath*	Y     N	0	1	2	3	4
Constipation*	Y     N	0	1	2	3	4
Difficulty sleeping*	Y     N	0	1	2	3	4
Difficulty concentrating	Y     N	0	1	2	3	4
Nausea*	Y     N	0	1	2	3	4

How frequently did these symptoms occur during the last week?

Symptom	Present	Rarely	Occasionally	Frequently	Almost constantly
Worrying	Y      N	1	2	3	4
Feeling sad	Y      N	1	2	3	4
Feeling nervous	Y      N	1	2	3	4

The scoring is similar to that for the MSAS Short Form. For physical symptoms (top box), the following weights apply for present symptoms: 0.8 for “Not at all,” 1.6 for “A little bit,” 2.4 for “Somewhat,” 3.2 for “Quite a bit,” and 4.0 for “Very much.” Zero is assigned if the symptom is not present (N).

For psychological symptoms (bottom box), the weights are 1 for “Rarely,” 2 for “Occasionally,” 3 for “Frequently,” and 4 for “Almost constantly.” Zero is assigned if the symptom is absent (N).