Abstract: Improvement in Peak Expiratory Flow Rate (PEFR) in 35 Patients with acute severe broncospasm was studied to evaluate the rate of recovery from the episodic attack. Two groups of COPD were identified. One group with quick and complete recovery from the episodic attack of broncospasm who were described as “Accelerated Responders” and in the other group the recovery was slow and incomplete and were referred to as “slow Responders”. The way how PEFR values establish a pattern in obstructive disease help us not only to identify the patients into groups but also to discriminate them for diagnosis & treatment of chronic obstruction for patients who are particularly at risk are discussed over here.