Dyspnoea in advanced cancer - a flow diagram

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Abstract
Dyspnoea is here defined as the subjective sensation in patients with advanced cancer where the demand for oxygen is greater than the body's ability to supply oxygen. In advanced cancer causes may be unrelated to or related in a direct or indirect way to the malignancy. This flow diagram describes the decision processes required to manage such patients. It is assumed that nonmalignant causes of dyspnoea have, or are, being treated conventionally (e.g. chronic obstructive airways disease).