Clinical meaning
Dysphagia involves impaired swallowing function that may occur at the oral, pharyngeal, or esophageal phase. The International Dysphagia Diet Standardisation Initiative (IDDSI) framework provides a global standardized terminology for texture-modified foods (levels 3-7) and thickened liquids (levels 0-4). Level 0 represents thin liquids, level 1 slightly thick, level 2 mildly thick, level 3 moderately thick (liquidized), level 4 extremely thick (pureed), level 5 minced and moist, level 6 soft and bite-sized, and level 7 regular. Aspiration occurs when food or liquid enters the trachea below the level of the true vocal cords, potentially causing aspiration pneumonia. Silent aspiration occurs without visible coughing or distress, making it particularly dangerous. Speech-language pathologists (SLPs) assess swallowing function and determine appropriate diet texture.