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Duke Activity Status Index
Duke Activity Status Index
Duke Activity Status Index
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Duke Activity Status Index
Purposeused to evaluate the functional capacity of those with cardiovascular disease

The Duke Activity Status Index (DASI) is an assessment tool used to evaluate the functional capacity of patients with cardiovascular disease (CVD), such as coronary artery disease, myocardial infarction, and heart failure.[1]

In clinical practice, DASI can be used to assess the effects of medical treatments and cardiac rehabilitation as well.[2] Positive responses are summed up to get a total score, which ranges from 0 to 58.2. Higher scores would indicate a higher functional capacity.[citation needed]

The instrument is copyrighted by one of its authors, Mark Hlatky.[3][4]

References

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Duke Activity Status Index

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The Duke Activity Status Index (DASI) is a validated, 12-item self-administered developed to assess patients' functional capacity by querying their ability to perform common daily activities, such as personal care, ambulation, and household or recreational tasks, each weighted by estimated metabolic equivalents (METs). Scores range from 0 to 58.2, with higher values indicating greater functional capacity and correlating significantly with peak oxygen uptake (VO₂ max), a key measure of (Spearman correlation coefficients of 0.80 in development and 0.58 in validation cohorts, both p < 0.0001). Originally created in 1989 by Hlatky et al. at Duke University to provide a practical alternative to exercise testing for evaluating quality of life and physical limitations, the DASI has demonstrated strong reliability (e.g., test-retest intraclass correlation coefficient of 0.87 and internal consistency Cronbach's α of 0.93) and concurrent validity in diverse populations. Primarily applied in cardiovascular medicine, the DASI evaluates functional status in conditions like coronary artery disease, heart failure, myocardial ischemia, and infarction, aiding in treatment monitoring, rehabilitation outcomes, and prognostic assessments. It has also been integrated into preoperative risk stratification for noncardiac surgery, where a score of ≥34 suggests low perioperative cardiovascular risk, while lower scores predict higher rates of complications, mortality, and prolonged recovery. Systematic reviews confirm its association with postoperative adverse events, supporting its use alongside clinical guidelines like those from the /. The tool's brevity (administration time of 1–3.5 minutes) and patient-centered approach make it widely accessible in clinical settings worldwide, with translations and cultural adaptations enhancing its global utility.

Overview

Definition and Purpose

The Duke Activity Status Index (DASI) is a 12-item, self-administered questionnaire that evaluates an individual's functional capacity by querying their ability to perform a range of common daily activities, such as personal care, household tasks, ambulation, and recreational pursuits, without developing symptoms like shortness of breath, anginal pain, or excessive fatigue. Developed specifically for use in patients with cardiovascular disease, it provides a subjective measure of physical limitations in routine functioning. The primary purpose of the DASI is to estimate peak oxygen uptake (VO₂ max) and metabolic equivalents (METs) as indicators of cardiovascular fitness and exercise capacity, offering a practical tool for clinical decision-making. These estimates facilitate risk stratification, such as identifying perioperative cardiac risks, prognostic evaluation in chronic conditions, and personalized treatment planning, including exercise prescriptions or surgical recommendations. Functional capacity, as assessed by the DASI, encompasses the extent to which a person can engage in activities of daily living without symptom limitation, serving as a key proxy for overall cardiorespiratory health. The tool demonstrates strong correlation with objective gold-standard measures, such as those from cardiopulmonary exercise testing (CPET), with Spearman correlation coefficients ranging from 0.58 to 0.80 in validation cohorts, thereby validating its utility as a reliable, non-invasive alternative in resource-limited settings.

Historical Development

The Duke Activity Status Index (DASI) was developed by Mark A. Hlatky and a team of colleagues, including Robert E. Boineau, Michael B. Higginbotham, Kerry L. Lee, Daniel B. Mark, Robert M. Califf, Frank R. Cobb, and David B. Pryor, all affiliated with the Duke University Medical Center in . The instrument emerged from research supported by grants from the , the National Center for Health Services Research, the National Library of Medicine, the , and the . It was first published in 1989 in the American Journal of Cardiology under the title "A brief self-administered questionnaire to determine functional capacity (the )." The development of the DASI addressed the need for a practical, patient-reported measure of functional capacity in cardiovascular care, serving as a noninvasive alternative to resource-intensive methods like cardiopulmonary exercise testing (CPET) or formal treadmill assessments with peak oxygen uptake measurement. Researchers interviewed 50 subjects undergoing treadmill exercise testing to identify common daily activities and their metabolic equivalents, deriving a 12-item questionnaire that correlated strongly with objective peak oxygen uptake (Spearman correlation coefficient of 0.80). This initial cohort primarily consisted of patients evaluated for known or suspected coronary artery disease via cardiac catheterization, reflecting the tool's origins in assessing functional limitations tied to cardiac conditions. Validation in an independent group of 50 similar patients confirmed its utility, with a correlation of 0.58 (p < 0.0001). Following its inception, the DASI evolved beyond its primary focus on coronary artery disease through targeted validations in the 1990s and 2000s, expanding applicability to diverse cardiovascular and related populations. In 1997, a reduced version demonstrated reliability and validity in chronic coronary patients post-myocardial infarction or revascularization. By 2000, it was validated for women with suspected coronary disease, showing reasonable correlation with treadmill-derived functional capacity. Into the early 2000s, adaptations extended to noncardiac groups, such as patients with chronic obstructive pulmonary disease (COPD), where it exhibited concurrent criterion validity against physiologic work capacity measures. These milestones broadened the DASI's role as a versatile, self-reported tool for functional assessment across varied clinical contexts.

Questionnaire Design

Component Items

The Duke Activity Status Index (DASI) questionnaire consists of 12 yes/no questions designed to assess a patient's ability to perform a range of daily activities, categorized into personal care, sexual activity, household tasks, yard work, and recreational activities. Each item is weighted according to its estimated metabolic equivalent of task (MET) value, which quantifies the energy expenditure required for the activity. These weights were derived from established MET values in the Compendium of Physical Activities, allowing for a standardized measure of functional capacity. The specific items and their corresponding weights are as follows:
ItemActivity DescriptionWeight (METs)
1Can you take care of yourself, that is, eating, dressing, bathing, or using the toilet?2.75
2Can you walk indoors, such as around your house?1.75
3Can you walk a block or two on level ground?2.75
4Can you climb a flight of stairs or walk up a hill?5.50
5Can you run a short distance?8.00
6Can you do light work around the house like dusting or doing the dishes?2.70
7Can you do moderate work around the house like vacuuming, sweeping floors, or carrying groceries?3.50
8Can you do heavy work around the house like scrubbing floors or lifting or moving heavy furniture?8.00
9Can you do yard work like raking leaves, weeding, or pushing a power mower?4.50
10Can you have sexual relations?5.25
11Can you participate in moderate recreational activities like golf, bowling, dancing, doubles tennis, or throwing a baseball or football?6.00
12Can you participate in strenuous sports like swimming, singles tennis, football, basketball, or skiing?7.50
These weights contribute to an overall functional capacity score when affirmative responses are summed.

Administration Methods

The (DASI) is typically administered as a self-completed questionnaire in either paper-based or digital formats, allowing patients to respond independently without specialized training.90496-7/fulltext) It generally takes less than 5 minutes to complete, making it suitable for quick assessments in busy clinical environments. This tool is commonly used in outpatient clinics for routine evaluations of functional capacity in patients with cardiovascular conditions. It is also integrated into preoperative assessments to gauge exercise tolerance and perioperative risk prior to noncardiac surgery.30929-8/fulltext) Additionally, telephone administration has been validated as a reliable method, particularly for remote monitoring in populations such as chronic stroke survivors, facilitating telemedicine applications. Patients receive straightforward instructions to indicate, via yes/no responses, whether they can perform each described activity without stopping due to symptoms such as shortness of breath, chest pain, or fatigue.90496-7/fulltext) No prior preparation or clinician-led training is required, emphasizing its design for ease of use by individuals with varying levels of health literacy. Adaptations include proxy completion by a caregiver or clinician when the patient is unable to respond independently, ensuring accessibility for those with cognitive or physical limitations. The DASI has been translated and culturally adapted into multiple languages, including Brazilian Portuguese, Spanish, Turkish, Thai, and Sinhala, to support diverse patient populations while maintaining psychometric properties.

Scoring System

Calculation Formula

The Duke Activity Status Index (DASI) total score is computed by summing the assigned weights for each item to which the patient responds affirmatively, reflecting the estimated metabolic equivalents (METs) required for those activities. The possible scores range from 0 to 58.2, with higher values indicating greater functional capacity. From the total DASI score, peak oxygen uptake (VO₂) can be estimated using the regression-derived formula: Peak VO2 (mL/kg/min)=0.43×DASI score+9.6\text{Peak VO}_2 \ (\text{mL/kg/min}) = 0.43 \times \text{DASI score} + 9.6 This equation was developed through correlation with measured VO₂ from treadmill exercise testing in the original validation cohort. The estimated peak VO₂ is then converted to METs by dividing by 3.5, as 1 MET equals 3.5 mL/kg/min of oxygen consumption at rest; this allows classification of exercise capacity, such as values below 4 METs suggesting limited functional reserve. For example, a patient endorsing five activities with weights summing to 20 would have a DASI score of 20, yielding an estimated peak VO₂ of approximately 18.2 mL/kg/min (0.43 × 20 + 9.6) and about 5.2 METs (18.2 / 3.5).

Interpretation Guidelines

The (DASI) produces a total score ranging from 0 to 58.2, with higher values corresponding to greater patient-reported functional capacity and estimated peak oxygen consumption. This score serves as a proxy for metabolic equivalents (METs), where a DASI greater than 34 typically equates to more than 7 METs, signifying good exercise tolerance suitable for moderate physical activities. Conversely, scores below 20 reflect limited capacity, often below 5 METs, indicating poor tolerance for daily tasks and elevated clinical risk. In prognostic contexts, lower DASI scores are strongly associated with adverse outcomes, including increased mortality and cardiac events. For instance, in patients with chronic heart failure, a cutoff of ≤23 predicts a 36-month mortality hazard ratio of 4.71, enabling risk stratification for rehabilitation planning. Similarly, scores ≤25 correlate with higher rates of major adverse cardiac events in stable cardiac populations, independent of other risk factors. In heart failure specifically, thresholds around 18.3 have been identified to distinguish adequate from impaired exercise capacity, aiding in therapeutic decision-making. DASI interpretation is enhanced when combined with complementary assessments for a holistic view of patient status. It is frequently integrated with the New York Heart Association (NYHA) functional classification to correlate self-reported limitations with symptom severity, or with the 6-minute walk test to validate objective exercise performance against subjective reports. In preoperative settings, a DASI below 34 serves as a key threshold for identifying elevated risk of postoperative complications, such as myocardial injury or moderate-to-severe morbidity, guiding perioperative optimization. These guidelines underscore the DASI's role in translating scores into actionable clinical insights without relying solely on invasive testing.

Validation Studies

Original Validation

The original validation of the Duke Activity Status Index (DASI) was conducted in a study published in 1989 by Hlatky et al., involving 100 patients (50 in the development group and 50 in the validation group) with coronary disease who underwent cardiopulmonary exercise testing (CPET) to measure peak oxygen uptake (VO2 max). The study design focused on developing and testing the DASI against this gold-standard objective measure of functional capacity, with the questionnaire administered to assess patients' ability to perform everyday activities. The patient population primarily consisted of individuals with stable and post-myocardial (post-MI) at Medical Center. Key findings demonstrated that the DASI accurately estimated functional capacity, achieving strong correlations with CPET-measured VO2 max (Spearman r = 0.80 in the development group and r = 0.58 in the validation group, both p < 0.0001). These results highlighted the DASI's utility as a practical, patient-reported tool for evaluating exercise tolerance in coronary disease without requiring invasive testing.

Reliability and Adaptations

The Duke Activity Status Index (DASI) exhibits strong reliability across multiple studies beyond its initial development, supporting its use as a stable measure of functional capacity. Internal consistency is generally high, with Cronbach's α coefficients ranging from 0.81 to 0.99 in various patient groups; for instance, values between 0.81 and 0.89 have been reported in chronic coronary patients. Test-retest reliability exceeds 0.90 in cardiovascular disease (CVD) populations, as evidenced by intraclass correlation coefficients (ICC) of 0.93 in Arab patients with CVD and 0.98 in those with pulmonary hypertension. These metrics indicate the DASI's consistency in capturing self-reported physical limitations over time and across items. Subsequent validation studies have confirmed the DASI's utility in diverse conditions. A 2023 cross-sectional study validated telephone administration of the DASI in 50 chronic survivors, demonstrating excellent agreement between in-person and telephone formats (ICC = 0.99) and no significant score differences, facilitating remote assessment in rehabilitation settings. Similarly, a 2021 study of 85 patients with showed the DASI effectively discriminates World Health Organization functional classes, independently predicting functional class (r = 0.55, explaining 30% of variance) and exercise capacity via the 6-minute walk test (r = 0.70, explaining 50% of variance). These findings extend the instrument's reliability to non-cardiac applications while maintaining correlations with objective measures like peak oxygen uptake from earlier validations. Adaptations of the DASI have enhanced its practicality and accessibility. The modified DASI (m-DASI), a shortened version with 4 items (M-DASI-4Q) selected for maximal discriminatory power, was developed in a 2021 secondary analysis of preoperative patients to improve efficiency in screening for cardiopulmonary exercise testing, preserving strong associations with anaerobic threshold and peak oxygen uptake. Cultural translations include the 2014 Brazilian Portuguese version, validated in 67 CVD patients with high (Cronbach's α = 0.93), good test-retest reliability (ICC = 0.87), and concurrent validity against measured oxygen uptake (r = 0.51). The DASI demonstrates responsiveness to therapeutic interventions, such as , where pre- to post-program score improvements reflect gains in functional capacity, underscoring its sensitivity to change. A change exceeding 4 points is considered clinically meaningful in contexts like rehabilitation outcomes.

Clinical Applications

Use in

The Duke Activity Status Index (DASI) plays a key role in evaluating functional capacity among patients with , aiding in the prediction of adverse outcomes such as hospitalization and mortality. In a cohort of 1,700 stable patients with chronic , a low DASI score (lowest , <15.5) was associated with a 3.3-fold increased risk of all-cause mortality over five years, independent of factors like left ventricular and N-terminal pro-B-type levels. This predictive value supports its use for risk stratification, where scores below established thresholds signal higher event rates and guide intensified management. Additionally, serial DASI assessments monitor response to interventions, including , as improvements in scores correlate with reduced long-term risks in trials. In , the DASI facilitates preoperative risk stratification, particularly for noncardiac surgery, by estimating metabolic equivalents (METs) of functional capacity. A DASI score below 34 indicates reduced functional capacity (estimated <7 METs), identifying patients at elevated risk for perioperative cardiovascular complications, such as or death, allowing for targeted optimization before procedures. Guidelines from the and endorse incorporating DASI into assessments for those with to refine surgical planning and reduce postoperative morbidity. The DASI has been validated for use in other cardiovascular conditions, including valvular heart disease and arrhythmias, where it correlates with disease severity and functional limitations. For instance, in mitral valve stenosis, lower DASI scores align with advanced New York Heart Association functional class and echocardiographic parameters, supporting its role in prognostic evaluation. It also integrates with echocardiography for enhanced prognosis in these populations, providing a subjective complement to objective imaging for tracking symptom burden and exercise tolerance. A 2014 multicenter study of 8,987 stable cardiac patients undergoing demonstrated that low DASI scores offered incremental prognostic value beyond in predicting major adverse cardiac events, reclassifying 15% of cases and highlighting a 3.8-fold adjusted increase for the lowest over three years.

Applications in Other Conditions

The Duke Activity Status Index (DASI) has demonstrated utility in evaluating functional capacity among survivors, aiding in the assessment of independence in daily activities. A 2019 validation study established a DASI cutoff score of approximately 32 points to differentiate between poor and good functional capacity post-, with scores above this threshold indicating greater independence in performing routine tasks. In , the DASI serves as a practical tool for gauging exercise tolerance, particularly in patients receiving . A 2023 study comparing DASI scores to cardiopulmonary exercise testing in individuals undergoing preoperative assessment for cancer surgery found significant correlations between self-reported DASI values and objective measures of peak oxygen uptake (VO₂), highlighting its role in identifying limitations in physical performance among this population. For patients with , the DASI facilitates risk stratification by linking self-reported activity levels to prognostic outcomes. Research from 2021 showed that a DASI score ≥26 effectively discriminates between those with favorable long-term survival and higher-risk individuals, correlating with functional exercise capacity and supporting clinical decision-making in this chronic respiratory condition. Beyond specific diseases, the DASI integrates into preoperative for non-cardiac , enhancing prediction models for complications in diverse patient groups, including the elderly and those with chronic illnesses. A 2019 analysis within the Measurement of Exercise Tolerance before Surgery (METS) study incorporated DASI scores into existing indices, revealing that thresholds around 34 points improved identification of perioperative cardiac risks, making it a valuable, non-invasive adjunct for broader surgical populations.

Limitations

Methodological Constraints

The Duke Activity Status Index (DASI) is susceptible to self-report bias, as it depends on subjective responses that can lead to over- or underestimation of functional capacity. For instance, individuals with normal functional capacity may underestimate their abilities in activities like attending work or school, walking, running, or climbing stairs, while overestimating symptoms such as , , or . The instrument also demonstrates ceiling effects, particularly among those with high functional capacity, such as athletes or young healthy adults, where many achieve the maximum score of 58.2, reducing its discriminatory power at the upper range; in one validation study of healthy young individuals, 65% attained this ceiling. Floor effects can similarly limit detection of severe impairments in highly restricted patients, though some studies report no significant floor effect in cardiovascular populations. DASI items reflect activities assuming a Western suburban lifestyle, which may lack relevance in urban or non-Western contexts, potentially skewing responses. Examples include queries on yard work like raking leaves or pushing a power mower, which prompted adaptations in cross-cultural validations, such as substitution with "cutting grass" for Brazilian Portuguese users to ensure semantic and cultural equivalence. Finally, the DASI offers only a static assessment of current functional status, failing to capture acute changes or temporal fluctuations, and is thus unsuitable for patients with recent acute illnesses, as noted in exclusion criteria across validation studies.

Cultural and Population Considerations

The Duke Activity Status Index (DASI) requires cultural adaptations to ensure relevance across diverse populations, involving translation and modification of items to align with local activities and norms. For instance, the 2014 Brazilian Portuguese validation followed Beaton's guidelines for adaptation, replacing less common activities like vacuuming with scrubbing floors by hand and adapting sports items (e.g., to soccer and ) to match regional practices while preserving metabolic equivalent (MET) values. Similarly, the 2024 Sinhala version adjusted distance units from "blocks" to local measurements and substituted activities such as vacuuming and with culturally appropriate equivalents like sweeping and , determined through expert review and Delphi technique. The Chinese adaptation accounted for lifestyle differences between Western and Chinese contexts to improve comprehension and response accuracy in patients. These modifications highlight the necessity of tailoring the DASI to avoid misinterpretation in non-Western settings, with numerous validations in languages including Turkish, , and demonstrating improved applicability. Population-specific limitations affect the DASI's accuracy, particularly in groups with low literacy or non-Caucasian backgrounds. In low-literacy cohorts, such as the Brazilian sample with lower levels, the was administered via to mitigate interpretation challenges, as self-completion may overwhelm individuals with limited reading skills. The Sinhala validation explicitly excluded illiterate participants, underscoring potential difficulties in such groups. For non-Caucasian populations, while adaptations enhance validity, the original English version—developed primarily in Western contexts—may underperform without localization, as evidenced by the need for extensive item revisions in Asian and Latin American studies to reflect ethnic and socioeconomic variations. In obese patients, recent assessments confirm the DASI's reliability ( coefficient 0.97) and validity ( with 6-minute walk test r=0.603) for preoperative functional capacity evaluation in bariatric candidates, though broader application requires verification beyond specialized cohorts. Evidence for orthopedic-impaired patients is limited, with validations in survivors showing telephone administration feasibility. The DASI has been primarily validated in middle-aged adults (e.g., mean age 46 years in Sinhala cohort, over 22 in Brazilian), with less data on younger or older individuals, potentially introducing biases from age-related activity patterns. differences also influence scores, as women may report lower functional capacity due to societal roles or physiological factors; studies recommend sex-specific thresholds (e.g., adjusting from a uniform 4 METs) for better risk in surgical contexts. To address these considerations, guidelines advocate combining the DASI with objective measures like for enhanced accuracy in diverse groups. Ongoing research, including 2024-2025 validations and endorsements in the AHA/ACC perioperative guidelines (Class 2a recommendation), supports developing more inclusive versions through continued global adaptations.

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