Hydration and clinically assisted nutrition

01Purpose and principlesWhat the treatment does and how it fits into care.

Eating and drinking have nutritional, relational, cultural and spiritual meanings. Begin by asking what matters: relief of thirst, enjoying taste, remaining alert, gaining strength for treatment, returning home or extending life. Distinguish inability to eat from loss of appetite and inflammatory cachexia. Family fear that the person is being starved often eases when the physiology and continuing mouth and comfort care are explained clearly.

Assess reversible barriers: dry or painful mouth, candidiasis, poor dentition, nausea, constipation, early satiety, depression, delirium and lack of assistance. Observe swallowing for cough, wet voice, prolonged chewing, pocketing and recurrent chest infection and seek speech-and-language assessment when it can improve safety or choice. Texture modification may reduce aspiration but can also reduce enjoyment and intake, so discuss trade-offs.

Hydration status is difficult to infer from one sign near death. Dry mouth may result from medicines, oxygen and mouth breathing despite adequate circulation; oedema can coexist with intravascular depletion. Review thirst, urine, losses, perfusion, weight, oedema, ascites, lungs and medicines. Electrolytes and renal tests are useful only when results could guide a treatment the person would want.

In the last days, offer frequent mouth and lip care, small sips and ice if safe and desired. NICE recommends considering clinically assisted hydration when distressing symptoms such as thirst or delirium could be dehydration related and oral intake is inadequate. Discuss that effects on survival are uncertain. Use a trial with daily review and reduce or stop if fluid overload, respiratory secretions, discomfort or no meaningful benefit develops.

Nutrition support follows gastrointestinal function and purpose. If oral intake is inadequate but the gut works and treatment aims at recovery or sustained function, nasogastric or gastrostomy feeding may be considered. Parenteral nutrition bypasses a non-functioning or inaccessible gut and demands central access, pharmacy compounding, biochemical monitoring and sufficient prognosis. Neither route is routine in the actively dying phase.

Risks are substantial. Tube feeding can cause aspiration, diarrhoea, blockage, displacement, nasal injury, stoma infection and restraint. Parenteral nutrition can cause line sepsis, thrombosis, glucose and electrolyte disturbance, liver dysfunction and loss of time to equipment and hospital care. Fluid can worsen pulmonary oedema, ascites, peripheral oedema and secretions. Evaluate these against the stated outcome, not against a moral presumption that more intake is always better.

Refeeding syndrome can follow rapid carbohydrate delivery after prolonged depletion. Identify low BMI, major weight loss, little intake, alcohol use and low phosphate, potassium or magnesium. Give thiamine before and during feeding, introduce calories at the NICE risk-based rate and monitor electrolytes, glucose, fluid and cardiac state. The presence of refeeding risk changes how nutrition starts, not whether the person deserves nutritional care.

Clinically assisted hydration and nutrition are medical treatments in UK professional guidance. A person with capacity can consent or refuse, even if refusal may hasten death. If capacity is absent, follow the governing framework: Mental Capacity Act 2005 in England and Wales, Adults with Incapacity legislation in Scotland and the applicable Northern Ireland capacity law and policy. Consider any valid advance refusal and authorised welfare attorney, consult those close to the person and seek second opinion or legal advice for unresolved serious disagreement.

Key points

Offer safe sips, preferred tastes, eating assistance and frequent mouth care whenever wanted; reduced intake in dying is not corrected reliably by pressure to eat or automatic fluid.
Clinically assisted hydration includes intravenous, subcutaneous and enteral fluid; clinically assisted nutrition includes tube and parenteral feeding. Both are medical treatments requiring indication, consent and review.
First-line assessment identifies thirst, delirium, dysphagia, aspiration, nausea, obstruction, fluid losses, medicine effects, prognosis and the outcome the person wants treatment to achieve.
Use swallow assessment before unsafe oral intake. A functioning accessible gut generally favours enteral feeding; parenteral nutrition is reserved for selected patients whose gut cannot be used and who have time to benefit.
In the last days, evidence is uncertain that clinically assisted hydration prolongs life or extends dying; it may relieve dehydration-related symptoms or worsen oedema, ascites, secretions and repeated procedures.
Offer an individual therapeutic trial when benefit is plausible: state the route, volume, target symptom or function, review time and stop criteria before treatment begins.
Artificial nutrition cannot reverse inflammatory cachexia by itself. Explain this to reduce blame and food-related conflict while continuing enjoyable intake if safe.
Screen for refeeding risk before nutrition after prolonged little or no intake; give thiamine, introduce energy cautiously and monitor phosphate, potassium, magnesium, glucose and fluid.
A capacitous adult may refuse assisted hydration or nutrition. When capacity is absent, check any valid advance decision or attorney authority and use a documented best-interests process under the applicable UK law.
The gold-standard plan is goal based and reversible: continue only while the person experiences the agreed benefit without disproportionate aspiration, infection, overload, restraint or monitoring burden.

02Indications, selection and cautionsWho may benefit, who needs urgent treatment and important alternatives.

Reversible intake barrier

Thrush, mucositis, nausea, constipation, depression, delirium or inadequate assistance can reduce intake despite preserved desire and potential benefit.

Unsafe swallowing

Coughing, wet voice, prolonged meals, pocketing, choking and recurrent aspiration indicate impaired airway protection and require route and risk discussion.

Dehydration-related distress

Thirst, postural symptoms, concentrated low-volume urine, medicine accumulation or delirium may improve with oral support or a monitored fluid trial.

Fluid-burden pattern

Crackles, increasing oxygen need, oedema, ascites and louder secretions suggest assisted fluid may be causing more harm than relief.

Inflammatory cachexia

Progressive muscle loss and weakness continue despite calories because tumour and systemic inflammation alter metabolism and cannot be reversed by feeding alone.

Refeeding syndromeRed flag

New oedema, tachycardia, weakness, confusion, arrhythmia or respiratory failure after restarting nutrition may reflect dangerous phosphate and electrolyte shifts.

Red flags requiring action

Cough, desaturation, wet voice or respiratory distress during feeding suggests aspiration and requires immediate cessation and assessment.
A displaced nasogastric tube must never be used until position is confirmed by the approved safety method.
Rapid breathlessness, crackles, oedema or rising oxygen need during hydration suggests fluid overload.
Fever, rigors, hypotension or inflamed central access during parenteral nutrition raises line sepsis.
Low phosphate, potassium or magnesium, arrhythmia, oedema or weakness after feeding starts suggests refeeding syndrome.
Physical restraint solely to maintain a feeding tube can create disproportionate harm and requires urgent best-interests review.
Serious family-team disagreement about starting or stopping life-sustaining nutrition needs senior mediation, second opinion and sometimes legal advice.

03Assessment before treatmentTests and checks that guide safe selection.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
First-line goal and intake assessmentFirst stepFirst line
Why
Clarify desired outcome, appetite, actual intake, assistance, symptoms, cultural meaning, prognosis and burdens acceptable to the person.
Interpretation and limitations
A defined achievable outcome is required before choosing a route; calories alone are not a treatment goal.
02
Mouth and swallowing assessment
Why
Inspect oral disease and observe voice, cough, bolus handling and fatigue, adding specialist swallowing assessment when useful.
Interpretation and limitations
Findings guide texture, risk-feeding, enteral route and mouth treatment; no test eliminates aspiration risk completely.
03
Clinical fluid assessment
Why
Review thirst, losses, urine, perfusion, weight, oedema, ascites, lungs, secretions and medicines that affect hydration.
Interpretation and limitations
Dry mouth alone does not prove systemic dehydration; benefit and overload risk determine whether fluid trial is reasonable.
04
Targeted biochemical profile
Why
Check renal function, sodium, potassium, magnesium, phosphate, glucose and liver tests when results can guide active fluid or nutrition treatment.
Interpretation and limitations
Abnormality guides correction and monitoring but routine bloods add burden when assisted treatment is not being pursued.
05
Refeeding-risk assessment
Why
Use BMI, recent weight loss, days of minimal intake, alcohol, medicines and baseline phosphate, potassium and magnesium under NICE CG32.
Interpretation and limitations
High risk mandates thiamine, lower initial energy and close biochemical and fluid monitoring before advancement.
06
Time-limited outcome review
Why
Measure the prespecified target such as thirst, alertness, treatment tolerance, wound healing, strength or time at home against complications.
Interpretation and limitations
This repeated goal review is the practical gold standard for continuing or stopping assisted hydration and nutrition.

04Treatment approachPreparation, options, escalation and aftercare.

01Supported oral careMaximise safe enjoyment and comfortFirst stepThe person wants oral intake and can swallow some food, fluid or tastes with acceptable risk.

1PreferredTreat mouth pain, candidiasis, nausea and constipation, provide upright assistance and offer small preferred textures and fluids without pressure.
2Discuss aspiration and enjoyment openly, including a documented risk-feeding plan when the person chooses oral intake despite known risk.
3Review comfort, coughing, fatigue, family anxiety and intake and adapt the plan as alertness and swallowing change.

02Hydration trialTest a symptom-focused fluid hypothesisOral intake is inadequate and thirst, delirium, medicine toxicity or another symptom may improve with additional fluid.

1Discuss uncertainty, route and overload risk and name the target, trial duration, individual fluid volume and stop criteria before cannulation.
2Use oral, subcutaneous or intravenous fluid at a rate matched to circulation, heart and kidney function and the care setting.
3Review at least daily for target benefit, lungs, oedema, ascites, secretions, urine and cannula burden and continue, reduce or stop accordingly.

03Nutrition supportMatch route to gut function and prognosisInadequate intake threatens an achievable recovery, treatment or functional goal and the person wants active nutrition support.

1Assess swallowing, gastrointestinal function, obstruction, aspiration, refeeding risk, disease options, prognosis, capacity and home-service feasibility with the nutrition MDT.
2Prefer enteral feeding when the gut is functional and accessible; reserve parenteral nutrition for selected non-functional or inaccessible gut with sufficient time to benefit.
3Start under a refeeding-safe protocol and review the target, infection, thrombosis, aspiration, glucose, liver, fluid and quality-of-life burden at agreed intervals.

04Withholding or stoppingMake a lawful treatment decision without abandonmentThe person refuses assisted treatment or it no longer achieves its goal, causes harm or becomes disproportionate.

1Assess and support capacity, check advance decisions and attorney authority and explain options, uncertainty and continued oral and mouth comfort care.
2If capacity is absent, use the applicable best-interests or benefit framework, consult those close to the person and document the least burdensome decision.
3Stop or reduce treatment with a symptom plan, communicate across services and seek second opinion, ethics or legal review if serious disagreement cannot be resolved.

05Regimens, contraindications and interactionsTreatment details and the circumstances that modify them.

Prevents thiamine-deficiency cardiac and neurological injury when carbohydrate metabolism accelerates after prolonged depletion.

Thiamine for high refeeding risk

Give oral thiamine 200 to 300 mg daily immediately before and during the first 10 days of feeding, with the multivitamin and electrolyte plan specified by NICE CG32; use parenteral replacement when oral absorption is unreliable.

Thiamine does not replace controlled energy introduction or phosphate, potassium, magnesium, glucose and fluid monitoring; treat established deficiency or Wernicke risk under the relevant protocol.

Prevents and treats the intracellular electrolyte depletion that drives arrhythmia, respiratory weakness, oedema and neurological injury during refeeding.

Electrolyte replacement during refeeding

Replace potassium, phosphate and magnesium using the NICE CG32 risk ranges and the local intravenous or oral protocol, adjusted to measured values, renal function, ECG and fluid status.

Renal failure increases accumulation risk and intravenous phosphate or potassium can be dangerous; use frequent biochemical review and monitored administration when severe.

May relieve selected dehydration-related symptoms or restore circulation when oral intake is inadequate and treatment matches the person's goal.

Individualised clinically assisted fluid

Prescribe a defined daily volume and rate of oral, subcutaneous or intravenous fluid from current losses, weight, renal and cardiac reserve and the therapeutic trial target; reassess at least daily rather than using a default litre regimen.

Monitor pulmonary oedema, ascites, peripheral swelling, secretions, cannula discomfort and urine; reduce or stop promptly when no target benefit or harm appears.

06Complications, monitoring and follow-upAdverse effects, response and longer-term review.

During oral support review enjoyment, cough, wet voice, fatigue, aspiration signs, mouth pain and whether assistance remains welcome.
During hydration track the agreed symptom, lungs, oxygen need, oedema, ascites, secretions, urine, weight and access-site burden at least daily.
During refeeding monitor pulse, fluid balance, oedema, glucose, phosphate, potassium and magnesium at the protocol-defined frequency.
During enteral feeding check tube position by approved policy, stoma or nasal injury, aspiration, diarrhoea, blockage and delivery tolerance.
During parenteral nutrition monitor line infection, thrombosis, glucose, electrolytes, liver tests, fluid state and time or care burden.
Ask patient and family whether the original outcome is occurring and whether the explanation of cachexia and reduced intake remains clear.
Repeat capacity, preferences and best-interests review when consciousness, prognosis, complications or disagreement changes.

07Special situationsVariants, exceptions and circumstances that change the usual approach.

Dry mouth is not a fluid chart

Medicine and mouth breathing often cause dryness that local care relieves better than systemic fluid.

Calories cannot reverse cachexia alone

Inflammatory metabolic muscle loss differs from starvation, so more feed may add burden without restoring strength.

Route follows function

A working gut generally favours enteral treatment, while parenteral nutrition is reserved for selected gastrointestinal failure.

A trial needs stop criteria

Without a named outcome and review time, assisted hydration or nutrition tends to continue by inertia despite harm.

Capacity is decision specific

A person may lack capacity for a complex feeding decision while retaining capacity for preferred tastes and daily mouth care choices.

Stopping treatment preserves care

Withdrawal of a non-beneficial tube or infusion should increase attention to mouth, symptoms, relationships and family support, not reduce it.

08Common pitfallsFrequent interpretation and management errors.

01
Equating dry mouth with a need for intravenous fluid without oral assessment.
02
Pressuring food as proof of care and increasing nausea, aspiration or family conflict.
03
Promising that clinically assisted hydration will prolong life or, conversely, hasten death when evidence is uncertain.
04
Starting a fluid trial without a symptom target, review date and overload stop criteria.
05
Using parenteral nutrition when a functional gut and suitable enteral route are available.
06
Starting full calories after prolonged minimal intake without refeeding precautions.
07
Using a displaced nasogastric tube before approved position confirmation.
08
Assuming family can consent to treatment simply because the patient lacks capacity.
09
Continuing feeding through aspiration, line sepsis or restraint without best-interests reassessment.
10
Describing treatment withdrawal as withdrawal of food, water, comfort or care.