Cardiac Depression Scale

Our cardiac pages discuss fear of exertion repeatedly; none names a validated instrument for it. Psychological distress after a cardiac event is common, is independently associated with worse outcomes, and is under-detected — and rehabilitation attendance is one of the few reliable opportunities to find it.^1,2

What it measures

The Cardiac Depression Scale (CDS) is a 26-item, cardiac-specific measure developed in Australia to assess mood in people with cardiac disease. Each item is rated on a seven-point scale, giving a total from 26 to 182, with higher scores indicating greater depressive symptoms. Subscales cover sleep, anhedonia, uncertainty, mood, cognition, hopelessness and inactivity.³

Why not simply use a general depression scale

General instruments include somatic items — fatigue, sleep disturbance, reduced activity — that are direct consequences of cardiac disease and are therefore scored positively in people who are not depressed. This inflates apparent prevalence and reduces specificity. The CDS was designed around that problem, and is more sensitive to the milder, sub-syndromal distress that is common after a cardiac event but falls below a diagnostic threshold.^3,4

⏹ This is not an argument against general tools. PHQ-9, HADS and the DASS-21 are all widely used and defensible, and HADS was designed to reduce somatic contamination in medical populations. The CDS is the cardiac-specific option where sensitivity to graded severity matters; use whichever the service can administer consistently.

How it is used

Self-completed in around 10 minutes, at rehabilitation intake and again at discharge. A short-form (CDS-SF) exists for brief screening. A commonly cited threshold of 95 indicates possible depression warranting further assessment, with higher scores indicating greater severity; thresholds vary between studies and the score is a screening prompt, not a diagnosis.⁵

Interpretation and what follows a positive screen

• A raised score is an indication to ask, not to diagnose. Follow with a conversation and, where indicated, referral to the general practitioner or a psychologist.
• Any indication of suicidal ideation requires immediate action under local escalation procedures, irrespective of total score.
• Distress frequently improves with rehabilitation attendance itself; re-screening at discharge captures that and is worth doing.
• Persistent distress despite completing a programme is a referral, not a reason to extend the exercise prescription.

Relevance to exercise prescription

Depression and cardiac anxiety are among the strongest predictors of non-attendance and drop-out from cardiac rehabilitation, and kinesiophobia — fear that exertion will cause harm — limits training intensity independently of physiological capacity.^2,6 A patient who stops well below their measured capacity may be limited by fear rather than by the heart, and that is a different problem requiring a different intervention. See prescribing exercise from test results, where a mismatch between test performance and training tolerance is discussed.

Role of the physiotherapist

Screen at intake as part of standard cardiac rehabilitation assessment; normalise the conversation, since many patients are relieved to be asked; refer appropriately and document; and recognise that graded, supervised, successful exercise is itself an evidence-based treatment for both mood and cardiac-specific fear. Screening without a referral pathway is not worth doing — agree the pathway before introducing the instrument.

References & evidence base

1. Lichtman JH, Froelicher ES, Blumenthal JA, et al. Depression as a risk factor for poor prognosis among patients with acute coronary syndrome: a scientific statement from the American Heart Association. Circulation 2014;129(12):1350–1369.
2. Meijer A, Conradi HJ, Bos EH, et al. Prognostic association of depression following myocardial infarction with mortality and cardiovascular events: a meta-analysis. Gen Hosp Psychiatry 2011;33(3):203–216.
3. Hare DL, Davis CR. Cardiac Depression Scale: validation of a new depression scale for cardiac patients. J Psychosom Res 1996;40(4):379–386.
4. Thombs BD, Bass EB, Ford DE, et al. Prevalence of depression in survivors of acute myocardial infarction. J Gen Intern Med 2006;21(1):30–38.
5. Shi WY, Stewart AG, Hare DL. Major depression in cardiac patients is accurately assessed using the Cardiac Depression Scale. Psychother Psychosom 2010;79(6):391–392.
6. Bäck M, Cider Å, Herlitz J, et al. The impact on kinesiophobia on physical activity and quality of life in coronary artery disease. Disabil Rehabil 2016;38(15):1503–1510.

References are numbered in citation order (Vancouver/BMJ style) and were current at the time of writing. Guidelines are living documents — verify against the latest version before clinical use.