Intensive Care

Overview

Intensive care is a special part of a hospital for people who are very seriously ill or badly hurt and need close, constant watching. You may hear it called the ICU (intensive care unit), critical care, or ITU (intensive therapy unit). The staff there are trained to support the body's vital organs - such as the heart, lungs, kidneys, and brain - when they are not working properly. Machines and special equipment often help with breathing, blood pressure, and other body jobs while the person's own body works on healing.

Only a small share of hospital patients need intensive care, so most people never see inside an ICU until someone they know is admitted. Still, hospitals use intensive care every day, and the teams there are used to helping frightened patients and families.

Anyone can need intensive care at any age - newborns, children, healthy adults, and older people. Babies sometimes need a special newborn unit called a neonatal unit, and older adults make up a large share of ICU patients because serious illness is more common with age.

Symptoms

Common symptoms

• Very fast or very slow breathing, or struggling to breathe even with extra oxygen
• Blood pressure that stays dangerously low, making the person feel faint or drowsy
• Confusion, agitation, or being unusually sleepy and hard to wake
• The body's organs starting to fail - for example, kidneys that stop making urine
• Severe bleeding, major burns, or a serious injury after an accident
• Needing close watching after a very big operation

Symptoms in children

• Breathing very fast, grunting, or the ribs pulling in with each breath
• Being floppy, unusually sleepy, or hard to wake
• Blue or grey lips, tongue, or fingertips
• A fit (seizure) that does not stop, or keeps coming back
• Not feeding, fewer wet nappies, or sunken eyes from dehydration
• A rash that does not fade when you press a glass on it

Symptoms in older adults

• Sudden confusion or a change in behaviour that is new for them
• A fall or sudden weakness, or being unable to stand
• Breathing problems that are hard to spot because they move around less
• Stopping eating and drinking, or making much less urine
• An infection that seems mild but makes them much more unwell very quickly

Causes

Main causes

• Severe infections that spread through the body (often called sepsis)
• Serious heart problems, such as a heart attack or heart failure
• Severe lung problems, including bad pneumonia or a flare-up of a long-term lung condition
• A stroke or a serious brain injury
• Major accidents, head injuries, and large burns
• Heavy bleeding, or complications during pregnancy and childbirth
• Big operations where the body needs support afterwards
• Sudden organ failure, such as kidneys or liver stopping working properly
• Severe reactions to medicines, or a dangerous rise or fall in blood sugar or salt levels

Risk factors

• Being older, or living with frailty
• Long-term conditions such as heart, lung, kidney, or liver disease, or diabetes
• A weakened immune system, for example from some illnesses or treatments
• Smoking, heavy alcohol use, or being very overweight
• Recent major surgery or a serious injury
• Pregnancy complications
• Delaying care when you feel very unwell - getting help early can sometimes stop things getting worse

When to see a doctor

See a doctor urgently if:

• Breathing that is getting harder, or feeling short of breath at rest
• A fever with confusion, shaking, or feeling much worse than a normal cold or flu
• New chest pain, or pain that spreads to the arm, neck, or jaw
• Not passing urine for a long time, or dark, very little urine
• A wound, burn, or injury that is getting worse rather than better
• Any sudden change in alertness or behaviour in an older person

Book a routine appointment if:

• You are recovering after intensive care and feel stuck, very tired, or low in mood
• You have questions about medicines, follow-up appointments, or getting back to work
• You are a family member finding it hard to cope after someone's stay in intensive care
• You want to know what to expect during recovery, or need a sick note or care plan

Diagnosis

There is no single test for needing intensive care. The decision is made by the medical team based on how ill the person is, how well their breathing, heart, and other organs are working, and how quickly things are changing. In the ICU, patients are watched all the time with monitors and regular tests, and the team keeps adjusting care as things change.

Tests that may be done

• Blood tests to check organs, oxygen levels, infection, and salt and sugar levels
• Blood gas tests to see how well the lungs are working
• An ECG (heart tracing) and continuous heart and blood pressure monitoring
• A chest X-ray, and sometimes CT or MRI scans
• An ultrasound or echocardiogram (heart scan)
• Urine tests and samples to look for infection
• Swabs and cultures to find the germ causing an infection

What to expect at your appointment

The ICU looks and sounds busy and strange: monitors beep, there are many tubes and wires, and staff talk in quick, technical terms. This is normal. Ask for a quiet word with a nurse or doctor each day so you understand what is happening, what has changed, and what the plan is. Some units keep a diary for the patient, which can help them make sense of their stay later. Write down your questions so you do not forget them.

Treatment

Intensive care is mostly about support: keeping the body safe and steady while it heals and while the team treats whatever caused the illness. That can mean help with breathing, keeping blood pressure up, supporting the kidneys, giving nutrition, and treating pain. The team also treats the underlying problem - an infection, a heart attack, an injury, or another cause.

Self-care at home

• As a patient, your job is to rest and let others help you - sleep and quiet are part of healing
• When you are able, do the small movement and breathing exercises the physiotherapy team gives you
• Tell staff about pain, thirst, fear, or bad dreams - there is almost always something that can help
• Ask questions and say what matters to you, including any wishes about your care
• If you are a family member: rest, eat, and take turns at the bedside so you can keep going
• Keep a simple notebook of updates, names, and questions
• After leaving intensive care, build activity up slowly and accept help with daily tasks at first

Medical treatments

Treatment in intensive care is supportive and is adjusted minute by minute. Breathing may be helped with extra oxygen through a mask, or with a breathing machine (ventilator) when the lungs need a rest. Fluids and medicines given into a vein can support blood pressure and circulation, and pain relief or light sedation can keep a patient comfortable. Nutrition may be given through a feeding tube. If the kidneys are not working, a machine can clean the blood (dialysis). Physiotherapists help keep joints and muscles working and clear the chest, and pharmacists check that medicines are safe together. The team also treats the cause - for example fluids and medicines for infection, treatment to reopen a blocked heart artery, or surgery after an injury. Every ICU patient is different, and the team will explain which parts apply to your relative.

When is surgery considered?

Sometimes surgery is part of intensive care, either before the ICU stay (for example after a major operation or accident) or during it, if a problem needs a hands-on fix. If surgery is being considered, the team will explain the reasons, the risks, and what it means for recovery.

Living with this condition

Leaving intensive care is a big step, but recovery is usually slow. Many people feel extremely tired, weak, and shaky at first, and everyday things like walking to the bathroom can feel hard. Some find their memory, sleep, and mood are affected for a while. This is common after critical illness and usually improves with time, rest, and gentle activity. Most people move to a normal ward before going home, and some need a period of rehabilitation in a community hospital or at home with therapy support.

Lifestyle tips

• Pace yourself: short bursts of activity with rests in between work better than pushing too hard
• Keep a simple routine for sleep - go to bed and get up at similar times, and rest in the day if you need to
• Ask for and accept practical help with shopping, cooking, and childcare for the first few weeks
• Go back to work gradually, and talk to your employer or doctor about a phased return
• Avoid smoking and keep alcohol within low-risk levels to help your body recover
• Keep up with follow-up appointments, and tell your doctor about new breathlessness, swelling, or low mood
• Join a support group - talking to people who have been through intensive care can really help

Diet and exercise

Good food helps healing. You may have lost weight or muscle during your stay, so aim for regular meals with protein at each one, and drink enough fluids. Ask your team if you need a dietitian, especially if eating is difficult or your appetite is slow to return. For exercise, start gently - short walks, sitting-to-standing practice, and the exercises your physiotherapist taught you. Build up a little each week. If you feel chest pain, severe breathlessness, or dizzy, stop and get advice.

Mental health and emotional wellbeing

Being critically ill can be frightening, and it can leave emotional marks. Many people have confusing memories, bad dreams, or hallucinations from their time in intensive care, and some feel anxious, low, or easily upset for weeks or months afterwards. Family members can feel the same. These feelings are common and treatable, so tell your doctor or nurse - they will not think you are being a nuisance. If you or someone you know is having thoughts of harming themselves or ending their life, get help straight away by calling your local emergency number or a crisis support line in your area.

Prevention

Not every stay in intensive care can be prevented - accidents and sudden illnesses happen. But getting help early when something is seriously wrong can stop an illness from becoming critical. Treat infections promptly, keep long-term conditions like heart disease, diabetes, and lung disease well controlled, and do not put off seeking care if you or someone you care about is getting worse quickly.

Vaccines

Staying up to date with recommended vaccinations helps prevent some of the infections that can lead to critical illness, including flu, COVID-19, and pneumonia vaccines where they are offered to you. Ask your doctor or pharmacist which ones are advised for your age and health.

Screening programmes

Routine health checks can pick up conditions like high blood pressure and diabetes before they cause serious problems. If you have a long-term condition, keep up with your reviews and take medicines as prescribed - this lowers the chance of a crisis.

Complications

If left untreated

• Without intensive care, severe illness can lead to organ failure, where the body cannot keep itself working
• Dangerously low oxygen or blood pressure can cause lasting damage to the brain and other organs
• Serious infections can spread quickly through the body and become life-threatening
• Being in intensive care can itself bring problems, such as infection, blood clots, pressure sores, muscle weakness, and confusion (delirium)

Long-term outlook

Most people who are admitted to intensive care survive and go home, though recovery is often slow and may take months. Some people are left with tiredness, weakness, or changes in memory and mood, and many improve steadily over the first year with rest, rehabilitation, and support. The team looking after you will be honest about what to expect. Ask them what the plan is, what progress looks like, and what help will be available afterwards.

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