pulmonary function testing Flashcards
normal spirometry for young adult
normal spirometry in older person
reversible airway obstruction
dotted line is reversibility
significant airflow obstruction
normal spirometry for young person
normal spirometry for older person
reversible airway obstruction
significant airflow obsturction
restriction
mixed obstruction/restriction pattern
examples of obstructive pulmonary dseases
asthma, COPD, asthma-COPD overlap
examples of restrictive pulmonary diseases
interstitial lung disease, rspiiratory muscle weakness, restrictive chest wall disease, rib deformity, obesity
arterial blood gas is useful for
guiding management of severe acute respiratory disorders in hospital
assessing disorers associated with chronic respiratory failure
assessment for long term oxygen therapy
pH<7.35
acidosis
pH>7.45
alkalosis
respiratory alkalosis
high pH
low PaCO2
eg. hyperventilation, heart failure
metabolic alkalosis
high pH
high HCO3-
eg. NGT, drug induced, chronic vomiting or diarrhoea
metabolic acidosis
low pH
low Hco3-
eg. DKA, CKD
acute respiratory acidosis
low pH
high PaCO2
low HCO3- (not compensated)
eg. acute exacerbation of COPD
chronic respiratory acidosis
low pH
high PaCO2
high bicarbonate (compensated)
eg. stable COPD
structure for interpreting arterial blood gas
venous blood gas
venous blood gas alone is inadequate to accurately assess pateints with respiratory failure
if venous blood gas analysis is performed and abnormal, arterial blood gas analysis should be performed
