3.2 Nutrition Screening, Dysphagia, and Feeding-Tube Nursing
Key Takeaways
- Radiographic confirmation is the only acceptable method of verifying initial nasogastric feeding-tube placement; auscultating an air bolus over the epigastrium is obsolete and unreliable.
- A gastric aspirate pH of 5.5 or below supports gastric placement at subsequent checks, but acid-suppressing therapy raises gastric pH and makes the test far less discriminating.
- Keep the head of the bed elevated at 30 to 45 degrees during enteral feeding and for at least one hour afterwards, which is the single most effective nursing measure against aspiration pneumonia.
- Refeeding syndrome is driven by an insulin surge that drives phosphate, potassium, and magnesium into cells; start severely malnourished patients at low calorie loads, replace thiamine before feeding, and monitor electrolytes daily.
- Thickened fluids, a chin-tuck posture, small single-consistency boluses, and full upright positioning are core dysphagia precautions; a wet or gurgly voice after swallowing signals penetration and warrants stopping oral intake.
3.2 Nutrition Screening, Dysphagia, and Feeding-Tube Nursing
Malnutrition is one of the most under-recognised complications in hospitalised patients: it slows wound healing, blunts immune response, prolongs ventilator dependence, and roughly doubles pressure-injury risk. The DHP blueprint names a dedicated nutrition text in its Nursing Fundamentals reference list, and exam items typically test three things — spotting the patient at nutritional risk, protecting the swallow, and running a feeding tube safely.
Screening and Assessment
Screening is a brief, routine trigger; assessment is the detailed follow-up. Most Gulf hospitals screen every admission within 24 hours using a validated tool such as MUST (Malnutrition Universal Screening Tool) or NRS-2002, which combine three elements: current body mass index, unintentional weight loss, and the effect of acute illness on intake.
| Indicator | Finding that flags nutritional risk |
|---|---|
| Body mass index | < 18.5 kg/m² (or < 20 kg/m² with other risk factors) |
| Unintentional weight loss | > 5% in 1 month, or > 10% in 6 months |
| Oral intake | Nil or negligible for > 5 days, or expected to be |
| Serum albumin | < 3.5 g/dL — a marker of inflammation and chronicity, not acute intake |
| Serum prealbumin | < 15 mg/dL — half-life ~2 days, so it tracks recent change |
A point examiners like: albumin has a half-life of about 20 days and falls in any inflammatory state, so it is a poor marker of short-term nutritional response. Prealbumin (transthyretin) responds within days and is the better index of whether your nutrition plan is working.
Therapeutic diets you should be able to match to a diagnosis
- Clear liquid → immediately post-operative, pre-endoscopy, acute gastroenteritis.
- Full liquid → transitional step; includes milk and cream soups.
- Low-residue / low-fibre → acute inflammatory bowel flare, post bowel surgery, before colonoscopy.
- High-fibre → diverticulosis (never during acute diverticulitis), constipation.
- Low-sodium (2 g) → heart failure, cirrhosis with ascites, hypertension.
- Low-protein → advanced chronic kidney disease pre-dialysis and hepatic encephalopathy; note that protein is increased once the patient is established on haemodialysis.
- Low-potassium → chronic kidney disease; avoid dates, bananas, citrus, potatoes, and salt substitutes.
- Gluten-free → coeliac disease; avoid wheat, barley, rye; rice, maize, and quinoa are safe.
- Low-purine → gout; limit organ meats, anchovies, sardines, and alcohol.
Dysphagia and Aspiration Precautions
Stroke, head and neck cancer, Parkinson disease, advanced dementia, and prolonged intubation all impair the swallow. Screen before the first oral intake in any of these patients, and escalate to a speech and language therapist rather than trialling food yourself.
Red flags during or after a swallow: coughing or throat-clearing, a wet or gurgly voice, drooling, pocketing food in the cheek, prolonged mealtimes, recurrent chest infections, and unexplained low-grade fever. Silent aspiration produces none of these, which is why recurrent right-lower-lobe pneumonia in a stroke patient is itself a red flag.
Core precautions:
- Sit the patient fully upright at 90 degrees for the meal and keep them upright for 30 to 60 minutes afterwards.
- Use a chin-tuck posture, which narrows the airway entrance and widens the vallecular space.
- Give small, single-consistency boluses; mixed consistencies such as cereal in milk are the hardest to manage.
- Thicken fluids as prescribed; thin liquids move fastest and are aspirated most easily.
- Minimise distraction, avoid straws unless specifically recommended, and never rush.
- Provide mouth care after every meal — pocketed food is both an aspiration and an infection risk.
Nasogastric and Gastrostomy Feeding
Enteral feeding is preferred whenever the gut works, because it preserves mucosal integrity and reduces bacterial translocation compared with parenteral nutrition.
Insertion and verification
Measure the insertion length using the NEX measurement (nose → earlobe → xiphoid process), mark the tube, and insert with the patient upright and the neck slightly flexed, asking them to sip water if swallowing is safe. Withdraw immediately for coughing, cyanosis, or an inability to speak.
Verification is where marks are won and lost:
| Method | Status |
|---|---|
| Radiographic (abdominal X-ray) | Gold standard; mandatory before the first feed or medication |
| Aspirate pH ≤ 5.5 | Acceptable for ongoing checks; unreliable on proton-pump inhibitors or H2 blockers |
| Measuring the external tube length against the documented mark | Supportive; used at every check for migration |
| Auscultating an injected air bolus ("whoosh test") | Obsolete and unsafe — never accept it as verification |
| Absence of coughing | Meaningless; silent bronchial placement is well documented |
Check placement before every feed, before every medication, and after any episode of vomiting, retching, or violent coughing.
Running the feed safely
- Head of bed 30 to 45 degrees throughout continuous feeding and for at least one hour after a bolus.
- Flush with 30 mL of water before and after each feed and each medication; medications go down one at a time, each separately flushed.
- Never crush enteric-coated or sustained-release preparations; request a liquid or an alternative route.
- Hang time for an open system is generally limited to 4 hours at room temperature; closed ready-to-hang systems follow the manufacturer's longer limit.
- Gastric residual volume: current practice no longer stops feeding for a modest residual. Assess the whole patient — distension, vomiting, pain — rather than the number alone, and follow local policy thresholds. Return the aspirate to the stomach where policy allows, so electrolytes are not discarded.
- Diarrhoea during enteral feeding is more often caused by sorbitol-containing liquid medications, antibiotics, or Clostridioides difficile than by the formula itself; investigate before changing feed.
Refeeding syndrome
When a severely malnourished patient (prolonged starvation, anorexia nervosa, chronic alcohol use, major unintentional weight loss) is fed, the carbohydrate load triggers an insulin surge that drives phosphate, potassium, and magnesium intracellularly and expands extracellular fluid. The result can be cardiac failure, arrhythmia, respiratory muscle weakness, seizures, and death within the first 72 hours.
Prevention is a nursing responsibility: identify the at-risk patient, ensure thiamine and other B vitamins are given before feeding starts, begin at a low calorie load and increase slowly over several days, monitor phosphate, potassium, and magnesium at least daily for the first 3 days, and monitor fluid balance and cardiac rhythm.
Nutrition in the Qatari Clinical Context
Practising in Qatar means integrating dietary practice into the care plan rather than treating it as an obstacle. Most patients require halal food, so confirm the provenance of gelatin-containing supplements, some enteral formulas, and capsule shells with pharmacy and dietetics. During Ramadan, patients who choose to fast need their medication and feeding schedules restructured around Iftar and Suhoor, close monitoring for dehydration in the Gulf climate, and clear teaching that illness may exempt them from fasting. Diabetes, chronic kidney disease, and enteral feeding all warrant an individualised pre-Ramadan review with the medical team.
A nurse has just inserted a nasogastric tube in a patient scheduled to begin enteral feeding. Which action correctly verifies that the tube is safe to use for the first feed?
A 32-year-old patient is admitted with a body mass index of 13 kg/m² after several months of negligible oral intake. The medical team plans to start enteral nutrition. Which nursing priority most directly prevents the life-threatening complication this patient is at risk of?
A nurse is supervising the first oral intake of a patient recovering from a left middle cerebral artery stroke. After two teaspoons of thickened fluid, the patient's voice becomes wet and gurgly and they clear their throat repeatedly. What is the nurse's most appropriate action?