ICU discharge and rehabilitation

Contents

Overview

Discharge from the ICU is a high-risk transition. Patients step down while still physiologically vulnerable, to an environment with less monitoring and fewer immediate clinical resources. Premature or inadequately planned discharge increases the risk of deterioration, unplanned readmission, and death on the ward. Equally, unnecessarily prolonged ICU admission occupies a scarce resource and exposes patients to ICU-associated harms. Getting discharge right requires structured criteria, thorough communication, and an active rehabilitation programme that begins in the ICU.

Criteria for ICU Discharge

There are no universally agreed discharge criteria, but standard principles include:

Resolution of acute organ failure: The primary reason for ICU admission should be resolved or significantly improved. The patient should not be dependent on organ support that cannot be continued on the ward (e.g., vasopressors, invasive ventilation, CRRT — unless the ward or step-down unit can maintain these).

Physiological stability: Vital signs within acceptable limits and stable on low levels of support. SpO2 maintained on supplemental oxygen at a level achievable on the ward. Haemodynamics stable off vasopressors, or on oral vasopressors that can be managed on the ward.

Clinical trend: Improving trajectory — the patient should be recovering, not in a period of active deterioration.

Nursing dependency: The patient's care needs must be manageable in the receiving environment. An HDU can manage patients with single-organ support and high dependency nursing; a general ward cannot.

Safe Discharge Practice

Timing

Discharge should ideally occur in daylight hours on a weekday. Systematic reviews and cohort studies demonstrate that out-of-hours ICU discharge — particularly between midnight and 6am — is independently associated with higher hospital mortality and ICU readmission rates, even after adjustment for illness severity. Night-time discharge often reflects external pressures (bed demand) rather than clinical readiness.

Premature discharge is associated with ICU readmission, which carries a substantially higher mortality than the original admission. Readmission rates of 5–10% are typical; mortality for readmitted patients is 30–50%.

Communication

A structured handover must occur between the ICU team and the receiving ward team — verbal and written. The handover document should include:

  • Reason for ICU admission and clinical course
  • Current active problems, treatments, and monitoring requirements
  • Drug chart reviewed and rationalised (stop ICU-specific infusions that are no longer needed; ensure oral medications are correctly resumed)
  • Outstanding investigations — who is responsible for reviewing results
  • Escalation criteria and ceiling of care — explicitly stated
  • Resuscitation status confirmed and documented
  • Family communication status

Nursing Dependency and Staffing

The patient's nursing care needs should be assessed against the staffing capability of the receiving ward. Using an acuity tool (e.g., ICNARC scoring, Nursing Activities Score) helps communicate care requirements. If the patient has nursing dependency that exceeds what the ward can safely manage, step-down to HDU should be considered.

Rehabilitation in the ICU

Rehabilitation in the ICU starts from day one — not after discharge to the ward.

Early Mobilisation

Prolonged bed rest is a major driver of ICU-acquired weakness, deconditioning, and functional dependency at discharge. Early physiotherapy-led mobilisation — even in ventilated, sedated patients — is safe and reduces the burden of PICS.

Levels of mobility achieved in the ICU:

  1. Passive range-of-motion exercises
  2. Active-assisted exercises in bed
  3. Sitting up in bed
  4. Sitting over the edge of the bed
  5. Standing and weight-bearing at the bedside
  6. Ambulation

Appropriate sedation management (light sedation targets, daily sedation holds, spontaneous breathing trials) is essential to make early mobilisation possible.

Physiotherapy

Chest physiotherapy prevents and treats atelectasis, assists secretion clearance, and supports ventilator weaning. Limb and mobility physiotherapy maintains or restores muscle strength.

Occupational Therapy

Occupational therapists assess functional capacity and cognitive function, and plan for safe return home. They advise on adaptive equipment, home modifications, and reablement strategies.

Dietetics

Nutritional support should be reviewed and transitioned from enteral to oral feeding as the patient's swallow recovers. Meeting protein and calorie targets is essential for muscle recovery.

Speech and Language Therapy

Swallow assessment and rehabilitation in post-extubation patients. Also provides communication support for patients with tracheostomies.

Psychology

Psychological input addresses anxiety, PTSD risk, and depression in prolonged ICU patients and their families. ICU diaries — written by nursing staff and family during the patient's stay — help patients reconstruct their experience and have been shown to reduce PTSD incidence.

ICU Follow-Up

FICM (Faculty of Intensive Care Medicine) guidance and NHS England recommend structured ICU follow-up for patients who have had a prolonged or complex ICU admission (typically >48 hours ventilated or ICU stay >5–7 days).

ICU follow-up clinics assess:

  • Physical recovery: functional capacity, muscle strength, respiratory function
  • Cognitive recovery: using validated tools such as MoCA or MMSE
  • Psychological recovery: PTSD screening (e.g., IES-R), PHQ-9 for depression, GAD-7 for anxiety
  • Unresolved medical problems and outstanding investigations

Patients with identified needs are referred to appropriate services: physiotherapy, psychology, neuropsychology, respiratory medicine, and so on.

Patient support groups such as ICUsteps provide peer support and information for patients and families and should be signposted at discharge.

Scoring Systems and Readmission Risk

Several scoring tools have been developed to predict ICU readmission or in-hospital deterioration after discharge:

SWIFT score: Predicts ICU readmission using variables at the time of discharge. Higher scores indicate higher readmission risk and may prompt enhanced monitoring or HDU step-down.

APACHE II / SOFA at discharge: Higher residual illness severity at discharge predicts worse outcome.

Clinical frailty scale: Pre-morbid frailty is strongly associated with post-ICU mortality and poor rehabilitation potential.

Early Warning Scores (NEWS2 in the UK) on the receiving ward provide a safety net — automated alert systems and critical care outreach programmes (CCOT) ensure that deteriorating patients are identified and reviewed promptly.

Viva Questions

What are the risks of out-of-hours ICU discharge and how do you mitigate them?

Out-of-hours discharge — particularly at night — is associated with higher ward mortality and ICU readmission rates compared with daytime discharge, independent of illness severity. The reasons are multifactorial: at night there are fewer senior clinical staff on the ward and fewer immediate resources for managing deterioration; the receiving team may not have had an opportunity to review the patient or the handover documentation before taking responsibility; and night-time discharge often reflects bed pressure rather than clinical readiness. Mitigation strategies include establishing a clear institutional policy that out-of-hours discharge requires senior authorisation based on clinical need rather than bed demand, ensuring structured written handover is completed regardless of time, ensuring critical care outreach is aware of recent step-down patients and reviews them promptly, and using escalation criteria in the discharge documentation to guide the ward team. Where out-of-hours discharge is unavoidable, direct phone communication between the ICU senior and the receiving ward team is essential.

How would you design and implement an early rehabilitation programme for a ventilated ICU patient?

Early rehabilitation begins from day one of ICU admission. The prerequisite is adequate management of pain, sedation, and delirium — it is difficult to mobilise a patient who is deeply sedated or in agitated delirium, and the ABCDEF bundle provides a framework that integrates rehabilitation into daily ICU care. Once sedation is appropriately light (RASS −1 to +1), physiotherapy begins with passive range-of-motion exercises for all limbs to prevent contracture and maintain joint mobility. As the patient becomes more alert and cooperative, active-assisted exercises in bed are introduced, progressing to sitting upright, sitting over the edge of the bed, and eventually standing at the bedside with assistance. For ventilated patients, in-bed cycling ergometers provide passive or active leg exercise without requiring the patient to stand. Safety criteria for mobilisation include: haemodynamic stability (MAP >65 mmHg, not escalating vasopressors), SpO2 >88% on current settings, RR <30, no active arrhythmia, no agitation precluding cooperation, and safe airway management during transfer of position. Daily documentation of mobility level achieved guides the physiotherapy programme and enables progress tracking.

What should a comprehensive ICU discharge summary include?

An ICU discharge summary is both a safety document and a communication tool. It should include the patient's reason for ICU admission and the clinical course in a structured but narrative form — not just a problem list. Current active problems and their ongoing management must be clearly stated, with responsibility for review assigned to a named person or team. The drug chart must be reviewed and documented: which drugs were started in the ICU and why, which were discontinued and why, and any monitoring requirements for current medications (e.g., drug levels, renal function for nephrotoxics). Outstanding investigations must be listed with a named reviewer. Physiological parameters at the time of discharge and monitoring requirements on the ward should be documented. Escalation criteria — what changes in physiology should prompt ward staff to contact the ICU or critical care outreach team — are a patient safety essential and must be explicitly stated. Ceiling of care and resuscitation status must be confirmed, documented, and communicated verbally to the receiving team. Family communication should be summarised, including what has been discussed and whether further conversations are planned.