Resp. Misc. 7 - Breathlessness is a multifactorial disease Flashcards
What conditions can cause a patient to become breathless? (6)
Heart failureAsthma and lung diseasesPEAngina equivalentHyper-ventilation syndromeAnaemia
Functional categorisations of causes of breathlessness?
Oxygen transportMechanical disadvantageRespiratory drivePerception of breathing
What is VO2?
the maximum amount of oxygen in millilitres, one can use in one minute per kilogram of body weight.
What does VO2=?
VO2 = CO X (CaO2 - CvO2) - Fick equation
When is VO2 max reached?
when oxygen consumption remains at steady state despite an increase in workload
What is the VO2 max of the average male?
45ml/kg/min
What is the VO2 max of the average female?
38ml/kg/min
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
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
What time frame is acute?
Mins - hours
What time frame is subacute?
Days
What time frame is chronic?
Months - years
