Resp. Misc. 7 - Breathlessness is a multifactorial disease Flashcards Preview

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Flashcards in Resp. Misc. 7 - Breathlessness is a multifactorial disease Deck (12):
1

What conditions can cause a patient to become breathless? (6)

Heart failure
Asthma and lung diseases
PE
Angina equivalent
Hyper-ventilation syndrome
Anaemia

2

Functional categorisations of causes of breathlessness?

Oxygen transport
Mechanical disadvantage
Respiratory drive
Perception of breathing

3

What is VO2?

the maximum amount of oxygen in millilitres, one can use in one minute per kilogram of body weight.

4

What does VO2=?

VO2 = CO X (CaO2 - CvO2) - Fick equation

5

When is VO2 max reached?

when oxygen consumption remains at steady state despite an increase in workload

6

What is the VO2 max of the average male?

45ml/kg/min

7

What is the VO2 max of the average female?

38ml/kg/min

8

What is the cause of ongoing SOB despite treatment for PE for 6 months with warfarin in a 56 year old female, limited to 100yd not he flat, mid swelling on ankles, O2 sats = 93% on room air dropping to 84% after short walk, normal spirometry but gas transfer reduced to 54%?

Chronic thromboembolic pulmonary hypertension

9

What is a diagnosis of exclusion for SOB that can be seen on complex physiology testing during exercise and can be helped with breathing retraining techniques?

Dysfunctional breathing

10

What time frame is acute?

Mins - hours

11

What time frame is subacute?

Days

12

What time frame is chronic?

Months - years