Blood Gas Analysis-Based Pharmacist Interventions

Optimizing Oxygen Therapy

For patients with chronic obstructive pulmonary disease (COPD), pharmacists can recommend the use of 24% or 28% Venturi masks based on blood gas analysis results, targeting an oxygen saturation of 88-92% 2, 1
In patients without hypercapnia risk, pharmacists can support adjusting oxygen therapy to target an oxygen saturation of 94-98% 3, 1
For patients with a respiratory rate exceeding 30 breaths per minute, pharmacists can intervene by increasing the Venturi mask flow up to 50% 2, 1

Pharmacists can monitor the risk of respiratory acidosis due to excessive oxygen administration in COPD patients based on blood gas analysis and intervene to prevent PaO₂ from exceeding 10.0 kPa 2, 1
To prevent life-threatening rebound hypoxemia after abrupt discontinuation of oxygen therapy, pharmacists can develop a gradual tapering plan 2, 1

For patients with respiratory acidosis (pH < 7.35, PCO₂ > 6.0 kPa), pharmacists can propose the use of non-invasive ventilation (NIV) or respiratory stimulants like doxapram 1
In cases of persistent respiratory acidosis 30 minutes after starting standard treatment, pharmacists can recommend the combination of NIV and targeted oxygen therapy 2

For patients with severe metabolic alkalosis (base excess > 30 mEq/L), pharmacists can recommend fluid resuscitation with physiological saline to restore vascular volume 4
Pharmacists can also propose adjusting medication to treat the underlying cause of acid-base disturbances 4

Based on blood gas analysis, pharmacists can support appropriate oxygen therapy (maintaining SaO₂ > 92%) and bronchodilator administration (salbutamol, ipratropium) in severe asthma exacerbations 5, 6, 7
Pharmacists can optimize steroid therapy (oral, inhaled, intravenous) based on asthma exacerbation severity assessment (mild, moderate, severe) 5, 6

Based on blood gas analysis results, pharmacists can propose the appropriate use of buffering agents (sodium bicarbonate) in critically ill patients (pH < 7.1, base excess < -10) 8
In special situations such as hyperkalemia or tricyclic antidepressant overdose leading to cardiac arrest, pharmacists can recommend the use of buffering agents 8

After changing oxygen therapy, pharmacists should re-examine blood gas analysis 1 hour later (or sooner if the patient's condition worsens) 1