Table 1– Similarities in anatomy, physiology and immunopathology in asthma and allergic rhinitis
AnatomyChronology of embryological development.Respiratory epithelium extends from the nasal fossa throughout the nasopharynx, larynx, trachea, bronchi and bronchioles
PhysiologyNasal and bronchial hyperresponsiveness to environmental and chemical stimuliNasobronchial reflex from environmental stimuli
ImmunopathologyImmediate hypersensitivity and allergic responses and persistent allergic inflammation, characterised by eosinophilia occuring in upper and lower airwaysThere is a systemic immune response to airborne allergens