Assessing the impact of breakthrough cancer pain.

Breakthrough pain is a transient exacerbation of pain that occurs either spontaneously or in relation to a specific predictable or unpredictable trigger despite relative stable and adequately controlled background pain. Breakthrough pain is a common and distinct component of cancer pain and is typically of rapid onset, severe in intensity, and generally self-limiting with an average duration of 30-60minutes. Despite the self-limiting nature of breakthrough pain, it can place significant physical, psychological, and economic burdens on both patients and their carers. Patients with breakthrough pain are often less satisfied with their analgesic therapy, they have decreased functioning because of their pain, and may also experience social and psychosocial consequences, such as increased levels of anxiety and depression. Successful management of breakthrough pain is best achieved by a thorough assessment which includes determining the severity, pathophysiology, and aetiology of the pain and takes into account both background and breakthrough pains while considering whether the underlying disease, co-morbidities or precipitating events are amenable to interventions. The features of breakthrough pain and the challenges it presents to patients, their carers, and health professionals are illustrated with a case study.