2) Ageing and the body Flashcards
Why is it important to know about the elderly?
- Most branches, you will be treating elderly
- > 50% elderly have at least 2 chronic conditions
- There are nearly 12 million people aged 65 and above in the UK of which:
– 5.4 million people are aged 75+
– 1.6 million are aged 85+
– Over 500,000 people are 90+ (579,776)
– 14,430 are centenarians (ONS, 2018f, 2018e).
How does ageing affect out skin?
- Elastic tissue becomes less effective as we age
- Skin becomes less tight
- More susceptible to damage and therefore more fragile
What issues might more fragile skin cause?
Where else may reduced elasticity cause problems?
- Respiratory system
- CVS
- Renal system
- Musculoskeletal system
- GI system
- Malnutrition
- Neurological system
- Dementia
How does reduced elasticity cause problems in respiratory system?
*Elasticity in the lungs is important for normal function
– Lung compliance
– Elastic recoil allows for passive exhalation
*Reduction in TLC, FVC, FEV1, vital capacity as we age
* Holding terminal airways and alveoli open
What are other causes of reduced elasticity in combination with ageing?
– Work exposure
– Smoke exposure
– Repeated infections
– Chemical/toxin exposure
These factors can cause it to occur earlier
Why are elderly more prone to respiratory infections?
*Reduced lung function puts people at greater risk of respiratory infections
– More likely to be acutely unwell
– More likely to need hospitalisation
– More likely to need oxygen / IV antibiotics
* More prone to post operative complications
– Atelectasis
– Pneumonia
– Pulmonary embolism
*Sedating drugs more likely to cause respiratory problems
How does ageing affect CVS?
*Blood vessels become more stiff as we age – particularly arteries
*Elastic recoil is reduced and therefore arteries are less expansile
* Increases resistance to blood flow
* Leads to hypertension
* Increased cardiovascular work
* Increased risk of left ventricular hypertrophy (LVH)
*Decreased left ventricular volume
*Can lead to heart failure
– Think back to CVS left sided heart failure initially which can then lead to the right side
failing
What is a risk of uncontrolled hypertension and how does it occur?
Atrial fibrillation
- Hypertension causes increased stretch of atria leading to small areas of damage
- New foci of electrical activity created
What are the key features on an ECG of AF?
- Irregularly irregular rhythm
- No p waves
- Wavy baseline
How does ageing affect the renal system?
- GFR decreases as we age (approx by 1ml/min/m2 from 30-40 yrs)
- Could be due to structural changes, atheromatous vascular disease, reduced CO (cause is unknown)
- Unable to excrete medications
Examples of co-morbidites that elderly have that may also effect renal system.
Diabetes
– Uncontrolled/poorly controlled diabetes
– Leads to diabetic nephropathy – damage to microvascular structures due to
hyperglycaemia
Hypertension
– Medication reduces blood pressure
– Some medications nephrotoxic – ACE inhibitors, NSAIDS particularly
– Need to prescribe with caution and review medications when patients are unwell
How does ageing affect MSK?
Bone
- Bone density decreases (gradual decline)
- More quickly in women after menopause
Muscle
- Multifactorial
- Use it or loose it
Bone marrow changes
- Less cellular and more fatty
- Decreased cellular production
Explain the composition of bone marrow
Red marrow
- Contained within spongy bone
- Hematopoietic stem cells to form: RBC, WBC, platelets
Yellow marrow
- In medullary cavity of shaft of long bones
- Made mostly of fat
- Contains mesenchymal stem cells: cartilage, fat, bone cells
Consequences of decreased bone density and muscle mass?
- Bone fractures
- Osteoporosis ( holes inside widen and outer walls thin, bone becoming more fragile)
