Enteral nutrition (EN) delivers liquid formula directly into the GI tract via nasogastric (NG), nasojejunal (NJ), gastrostomy (PEG), or jejunostomy (J-tube) tubes in patients who cannot meet nutritional needs orally but retain a functional gut. The greatest preventable harm is pulmonary aspiration — formula delivered into the lungs triggers aspiration pneumonia, chemical pneumonitis, and ARDS. A secondary but critical risk is tube misplacement: an NG tube positioned in the bronchus or pleura, confirmed by pH strip or X-ray rather than auscultation alone, can deliver hundreds of millilitres of formula into the chest before the error is detected. Top 3 nursing priorities: 1. Verify tube position with pH ≤5.5 aspirate and/or chest X-ray before every initiation and after any displacement event. 2. Maintain head-of-bed (HOB) elevation 30–45° during feeds and for 30–60 minutes post-feed to reduce aspiration risk. 3. Assess gastric residual volume (GRV) every 4 hours (or per protocol); hold feeds and notify the physician if GRV >250–500 mL on two consecutive checks (threshold varies by institution). Common NCLEX trap: Auscultation of air over the epigastrium (the "whoosh" test) is...