A child, known case of bronchial asthma, presents with respiratory distress with respiratory rate of 48/min, can speak barely 2 words. Nebulized salbutamol was given and patient could speak a sentence hut there was a fall in SpO2 from 95% to 85%. What could be the possible explanation?
Ventilation perfusion mismatch because of increased dead space ventilation Intra-thoracic shunting Due to salbutamol Faulty pulse oximeter