BRONCHIAL ASTHMA
Main diagnostic criteria for bronchial asthma is reversibility of airflow obstruction which is demonstrated by spirometry. SPIROMETER : Patient is made to perform forceful inspiration and expiration and flow volume curves are obtained Baseline curve for inspiration part remain same but expiration part patient is not able to push out the air as asthma is disease of expiratory. so, marked concavity in expiration part is present Now salbutamol is given and test is repeated in 10 - 15 min, concavity will reduce significantly (see above) FEV1 decreased ⟶⟶ after S.A.B.A (short acting beta2 agonist) ➝➝ FEV1 normal Methacholine provocation test : It is of historical importance. not done now as may lead to imminent respiratory failure. Eucapnic hyperventilation test : Person is made to breathe in cold air. asthmatics has bronchial hyper reactivity to cold air and FEV1 will fall DIAGNOSTIC CRI...