Dying (and cancer) Flashcards
What is the epidemiology of dying?
- 500,000 people die in England each year
- ⅔ deaths in people over 75 years
- Rise in female as opposed to male deaths (but more men die each year)
- Majority follow period of chronic illness
What chronic illnesses does death follow?
- CVD
- Cancer
- Chronic resp disease
- Stroke
- Neurological disease
- Dementia
What are the 4 causes of cancer causing syndromes?
- Primary tumour
- Distant mets
- Body’s responses to tumours
- Treatment for the above
What can distant mets cause?
Paraneoplastic syndromes
What can the bodys response be?
a) Systemic inflammatory response
i) Explains why 2 people with same cancer may have different responses
ii) White cell / humoral response
iii) IL-6 (1 to a lesser extent)
iv) Impacts on brain/muscle/brain function, appetite, fatigue
b) Polysystem changes
i) Neuroendocrine
ii) Haematopoietic
iii) Metabolic
iv) Hepatic
What are the neuroendocrine changes that may occur?
(1) Fever
(2) Somnolence → strong desire for sleep
(3) Anorexia
(4) ↑Cortisol + Catecholamines
What are the haematopoietic changes that may occur?
(1) Anaemia
(2) Leucocytosis
(3) Thrombocytosis
What are the metabolic changes that may occur?
(1) Cachexic - loss of striated muscle, -ve nitrogen balance
(a) From the end of the bed, temporalis and masseter muscles go in the very ill (look drawn). Muscles have the same power but lose bulk (grip is strong).
(2) ↑ lipolysis
What are the hepatic changes that may occur?
(1) ↑ Acute phase proteins - High ferritin and CRP
(2) ↑ Blood flow
(a) Albumin will drop - the lower the albumin the more sick patients are (not down to liver failure or malnutrition - the liver synthetic processes are directed elsewhere - albumin infusions will not fix the underlying problem)
What is the exponential growth theory of cancer?
Cancer is a lump growing steadily - there are no symptoms in the early stages. Often tumour lumps reach a critical mass, after which they stop growing. When a certain size is reached, cancer will start to cause symptoms.
Summarise cancer
- Similarity to infectious disease
- Exponential growth of tumour cells
- Immune/inflammatory response to cancer
- Biochemical changes: falling albumin, falling creatinine, anaemia
- Cancers cause symptoms because:
- SIADH (affects adrenals), hypercalcaemia, hypoadrenalism, GIT dysfunction
What is the time course progression of organ diseases vs cancer?
1) Single organ: heart, renal, COPD
- Start off ok, body takes a hit, but intermittent deterioration (e.g. infectious exacerbations of COPD), recover but not fully. A more significant exacerbation will kill them later on.
2) Cancer
- The tumour burden grows
- Not noticed until tumour reaches a critical mass → symptoms start
- Initially symptoms worsen from month to month, then week to week, then day to day, then hour to hour
- The diagram is wrong, things do not tail off
Do we over or under estimate prognosis in cancer patients?
Over estimate
How do we predict likely changes of survival?
Take median survival and multiply by half or double → covers 75% of patients
Patients who do very well - multiply median survival by 3
Patients who don’t do very well - multiple by a ¼
When do we get palliative care involved?
- If cancer is life-limiting, then at some point they will need palliative care.
- Curative and palliative care should not be mutually exclusive.