| Summary: | Introduction: This study aims to explore, modify, and develop the revised instruments for measuring Illness Beliefs Construct (IPQ-R) among heart failure patients in Malaysia. Materials and methods: The researcher adapted 38 items from previous study and modified the statement to suit current study. The IPQ-R statement was translated into Bahasa Malaysia and validated by the experts for content validity, face validity, and criterion validity. The sampling frame is the heart-failure patients registered with the cardiology department in the selected public hospitals in Malaysia. Probability sampling was used to obtain a random sample of 200 patients to participate in this study. The data were explored and validated through exploratory factor analysis (EFA) procedure. Results: The results of the EFA procedure revealed 38 items fall into five underlying components. The components are renamed as a timeline, control, causes, illness coherence, and emotion. The items under these five components explained 64.1% of the total variance. The internal reliability of the illness beliefs construct was 0.94. The researchers rearranged these 38 items into their respective components accordingly. The newly arranged instruments will be the outcome of this study. Conclusion: In addition to adding to the current body of knowledge, these findings provide a reliable source of information for research and professional practitioner interested in future researcher in illness beliefs related to heart failure patients in Malaysia. © 2024 Universiti Putra Malaysia Press. All rights reserved.
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