DYALS, short for Dysphagia in Amyotrophic Lateral Sclerosis, is a clinical questionnaire designed to assess and screen for swallowing difficulties (dysphagia) in people with amyotrophic lateral sclerosis (ALS). It was developed by adapting the DYMUS questionnaire, which was originally designed to evaluate dysphagia in multiple sclerosis, and was subsequently validated specifically for use in ALS.
Swallowing problems are common during the course of ALS and can affect nutrition, hydration, quality of life, and overall health. A structured questionnaire such as DYALS can help healthcare professionals identify swallowing difficulties and collect more consistent information when monitoring people with ALS.
What Is DYALS?
DYALS is a 10-item questionnaire intended for the screening and assessment of dysphagia in people with ALS. Its questions address swallowing difficulties involving both solid and liquid foods or drinks. Each item is answered in a dichotomous format, such as yes or no, and the resulting score provides an indication of the severity of reported swallowing problems.
A higher DYALS score indicates more severe dysphagia. The questionnaire has a total score of 10, making it relatively straightforward to administer and interpret in a clinical setting.
DYALS is intended as a screening and assessment tool. It does not replace a complete clinical evaluation when a healthcare professional suspects significant swallowing impairment.
Why Is Dysphagia Important in ALS?
Dysphagia refers to difficulty swallowing. In ALS, changes affecting the muscles involved in swallowing can develop as the disease progresses. These problems can interfere with eating and drinking and may have consequences for nutritional and respiratory health.
Swallowing difficulties may involve different parts of the swallowing process. A person may have trouble handling food in the mouth, moving food toward the throat, or safely swallowing liquids and solids.
Because swallowing problems can affect quality of life and prognosis in ALS, identifying them is an important part of patient care.
Development of the DYALS Questionnaire
The DYALS questionnaire was developed to address the need for a specific and standardized approach to assessing dysphagia in ALS.
The researchers adapted the DYMUS questionnaire, which was originally developed for dysphagia assessment in people with multiple sclerosis. The resulting DYALS questionnaire was then evaluated in people with ALS to determine whether it could provide a reliable and practical measure of swallowing difficulties.
The validation study involved 197 people diagnosed with ALS across 16 Italian ALS centers. Participants underwent several clinical assessments, including the ALS Functional Rating Scale-Revised (ALSFRS-R), ALSAQ-5, DYMUS, and EAT-10, allowing researchers to compare DYALS results with other measures.
What Does the DYALS Questionnaire Assess?
DYALS focuses specifically on symptoms associated with swallowing difficulties.
Its items cover problems involving solid foods and liquids, providing a structured way to identify different aspects of dysphagia. The questionnaire’s yes-or-no format makes it relatively simple for clinical teams to administer and repeat during patient follow-up.
Rather than relying only on a general description such as “the patient has swallowing problems,” DYALS provides a standardized set of questions that can help document specific difficulties.
Understanding the DYALS Score
The DYALS questionnaire has a maximum score of 10. Higher scores indicate greater severity of reported swallowing difficulties.
In the validation study, people with bulbar-onset ALS had significantly higher DYALS scores than people with spinal-onset ALS. The median score was 6 in the bulbar group compared with 1 in the spinal group.
This finding supports the questionnaire’s ability to distinguish between groups with different levels of swallowing-related involvement.
A DYALS score should, however, be interpreted within the broader clinical picture rather than used on its own to make treatment decisions.
Validation of DYALS
The DYALS questionnaire underwent formal validation as part of a multicenter study published in Neurological Sciences in 2022. The study reported strong internal consistency, with a Cronbach’s alpha of 0.88.
The researchers also found a strong correlation between DYALS and the EAT-10, another questionnaire used to assess swallowing difficulties. The reported correlation was rho = 0.90, indicating a strong relationship between the two measures in the study population.
The authors concluded that DYALS was reliable, manageable, and suitable for screening dysphagia in people with ALS.
DYALS and Bulbar ALS
ALS can begin in different parts of the body. In bulbar-onset ALS, symptoms initially involve muscles controlled by the bulbar region, which includes muscles involved in speech and swallowing.
Because swallowing difficulties can be particularly relevant in bulbar ALS, a questionnaire specifically designed to identify dysphagia can be useful in this population.
The validation study’s higher DYALS scores among participants with bulbar ALS provide supporting evidence for its ability to identify swallowing-related symptoms associated with this form of disease presentation.
DYALS Compared With Other Swallowing Measures
DYALS is one of several tools that can be used when assessing swallowing problems in ALS.
The EAT-10, for example, is a 10-item patient-reported measure of swallowing-related difficulties. The ALSFRS-R also includes a bulbar component that assesses swallowing, salivation, and speech. Other assessments can provide additional information about swallowing function and its impact on quality of life.
DYALS has the particular advantage of being developed specifically for people with ALS and focusing on dysphagia.
Healthcare professionals may select different tools depending on the patient’s symptoms, clinical setting, and purpose of assessment.
DYALS Is a Screening Tool
An important point about DYALS is that it is primarily a screening and assessment questionnaire. A score can indicate the presence and severity of reported swallowing difficulties, but it should not be considered a complete diagnostic evaluation of swallowing function.
When dysphagia is suspected, a healthcare professional may perform a more comprehensive swallowing assessment. Depending on the individual’s situation, this may involve a physician, speech-language pathologist, dietitian, or other members of the multidisciplinary ALS care team.
Further evaluation may be necessary to understand the specific nature of the swallowing impairment and determine appropriate management.
Benefits of Using DYALS
Several characteristics make DYALS useful in clinical practice.
Simple Format
The questionnaire uses straightforward yes-or-no responses, making it relatively easy to administer and complete.
ALS-Specific Design
Unlike general swallowing questionnaires, DYALS was specifically adapted and validated for people with ALS.
Assessment of Solids and Liquids
The questionnaire addresses dysphagia involving both solid and liquid intake, allowing clinicians to identify different types of swallowing complaints.
Standardized Information
Using a structured questionnaire can help healthcare professionals document swallowing symptoms consistently and monitor changes over time.
Research Applications
The original validation study noted that DYALS could help standardize dysphagia assessment across ALS centers and potentially support therapeutic strategies and clinical trials.
Limitations and Clinical Context
Although DYALS has been validated for ALS, it should be viewed as one component of a broader clinical assessment.
A questionnaire depends on reported symptoms and therefore does not directly observe every aspect of swallowing physiology. A person may require additional assessment if symptoms suggest a significant swallowing impairment.
The 2022 validation study was conducted across 16 Italian ALS centers, so its findings should be understood in the context of that study population and setting.
Clinical professionals should therefore interpret DYALS results alongside the patient’s medical history, symptoms, functional status, nutritional condition, and other relevant assessments.
Role of DYALS in ALS Care
Early recognition of swallowing difficulties can help ALS care teams respond to changing patient needs. If a person reports increasing difficulty eating or drinking, coughing while swallowing, or other swallowing-related symptoms, a healthcare professional can determine whether further evaluation is appropriate.
DYALS can provide a structured way of documenting these symptoms and following them over time.
Its relatively simple format can also make it practical for repeated use during clinical follow-up.
Frequently Asked Questions
What does DYALS stand for?
DYALS stands for Dysphagia in Amyotrophic Lateral Sclerosis. It is a questionnaire designed to assess swallowing difficulties in people with ALS.
What does the DYALS questionnaire measure?
DYALS measures symptoms of dysphagia, including difficulties associated with swallowing solid foods and liquids. It contains 10 yes-or-no items, with higher scores indicating greater reported dysphagia severity.
Is DYALS validated?
Yes. A 2022 study published in Neurological Sciences evaluated and validated the DYALS questionnaire in 197 people with ALS across 16 Italian ALS centers.
What does a high DYALS score mean?
A higher DYALS score indicates more severe reported swallowing difficulties. The maximum total score is 10. However, the result should be interpreted by a healthcare professional in the context of the individual’s overall clinical condition.
Is DYALS a diagnostic test?
DYALS is primarily a screening and assessment questionnaire, not a standalone diagnostic test. People with suspected swallowing impairment may need a more comprehensive clinical evaluation.
How is DYALS different from EAT-10?
Both are used to assess swallowing difficulties, but DYALS was specifically adapted and validated for people with ALS. The validation study found a strong correlation between DYALS and EAT-10 scores.
Conclusion
DYALS (Dysphagia in Amyotrophic Lateral Sclerosis) is a validated 10-item questionnaire designed to screen for and assess swallowing difficulties in people with ALS. It covers dysphagia involving solids and liquids and uses a straightforward scoring system in which higher scores indicate more severe reported swallowing problems.
Its validation study, involving 197 people with ALS across 16 Italian centers, found strong internal consistency and a strong correlation with EAT-10. The researchers concluded that DYALS is a reliable and practical tool for dysphagia screening in ALS.
As with any clinical questionnaire, DYALS should be used as part of a broader professional assessment rather than as a standalone basis for diagnosis or treatment.