Asthma is a chronic inflammatory disease of the airways. Caused by environmental and genetic factors, it is characterized by variable and recurring symptoms, reversible airflow obstruction and bronchospasm. Classification Asthma is clinically classified according to: 1. Frequency of symptoms2. Forced expiratory volume in 1 second (FEV1)3. Peak expiratory flow rate It can also be classified as: 1. Atopic (extrinsic)2. Non-atopic (intrinsic) Brittle asthma Brittle asthma is a term used to describe two rare phenotypes of asthma - Type 1, which is characterized by sustained, chronic variability of PEFR and Type 2 which is distinguished by sudden severe exacerbations. Asthma attack Also referred as acute asthma exacerbation, the symptoms are dyspnea, wheezing and tightening of the chest. The colour of skin and nails appear blue due to lack of oxygen. Status asthmaticus Status asthmaticus is considered a medical emergency as it is a life-threatening episode of airway obstruction and does not respond to standard treatments of bronchodilators and steroids. Characterised by smooth muscle hypertrophy and basement membrane thickening, this acute asthma exacerbation can cause complications like cardiac and/or respiratory arrest.
Taiwan:TransAsia Airways crashes during emergency landing
Basketball Asia Cup: Sikh players forced to remove turbans
Shiv Sena MPs `force` fasting Muslim to eat during Ramzan
Don`t take us for granted, NCP warns Congress