What Is a Medical Coma? Why Are Patients Put to Sleep in Intensive Care?

A medically induced coma is a controlled process where a patient is put into a deep state of unconsciousness using strong medications to rest the brain and minimize damage during severe trauma or critical illness. Being put to sleep in the intensive care unit (ICU) aims to protect vital organs by reducing the body's need for oxygen and energy, making it one of the most crucial steps in challenging treatment processes.

In short:

• A medical coma is initiated under a doctor's supervision to reduce the brain's energy and oxygen consumption.
• Patients are usually connected to a ventilator to secure their respiratory functions.
• The process is managed by continuously administering anesthetics and painkillers intravenously.
• The answer to "when will an induced patient wake up?" depends on the recovery speed of the primary illness.
• The waking phase is not an instant event but a gradual process where medication doses are slowly reduced.

What Is a Medical Coma?

Although the human brain makes up only a small fraction of body weight, it consumes about twenty percent of the body's total energy and oxygen. In cases of severe head trauma, brain hemorrhage, or serious infection, it becomes difficult for the brain to meet this high energy demand. The simplest answer to what a medical coma is: a pharmacological (drug-induced) and reversible state of unconsciousness that slows down the brain's electrical activity to lower this energy demand.

The normal coma state we often hear about is an involuntary loss of consciousness resulting from structural damage to the brain. A medical coma, on the other hand, is initiated entirely under the control of physicians using specific anesthetic and sedative drugs. The goal is to buy time for damaged or swollen brain tissue to heal. Once the medications are stopped, the patient is expected to regain consciousness. This is a highly sensitive medical intervention monitored moment by moment by intensive care specialists.

Being Put to Sleep in Intensive Care: Causes and Risk Factors

The decision to induce a coma in the ICU is made in the presence of specific life-threatening conditions. Severe head traumas are among the most common reasons. Because the skull is a closed box, post-trauma edema (swelling) in the brain raises intracranial pressure to dangerous levels. The induced coma regulates brain blood flow, lowering this pressure and preventing the brain from being compressed inside the skull and suffering permanent damage.

Additionally, a medical coma is used to calm the brain's electrical storm during unstoppable and consecutive epileptic seizures (status epilepticus). Furthermore, in severe lung infections or respiratory failures, putting the patient to sleep is essential so they can adapt to the ventilator and the body doesn't lack oxygen. Factors such as advanced age, chronic kidney, or liver failure are among the risk factors that can prolong the process, as they make it harder for the patient to clear the medications used during the coma from their body.

Symptoms of the Medical Coma Process and the Patient's Condition

When your loved one is admitted to the ICU and placed in a medically induced coma, you will notice they appear to be in a completely deep sleep from the outside. At this stage, the patient does not respond to voices, touch, or painful stimuli. Their eyes are closed, and their muscles are fully relaxed. This unresponsiveness is not a side effect of the treatment; on the contrary, it is the exact intended state.

Because all of the patient's basic vital reflexes are suppressed by medications during this process, breathing is taken over by a ventilator. Nutritional needs are met by administering special feeding fluids through a thin tube passed through the nose or mouth into the stomach (nasogastric tube). Since keeping the eyes closed for a long time can cause dryness in the cornea, nurses regularly apply moisturizing drops to the patient's eyes and keep them gently taped shut. All vital signs, such as body temperature, heart rhythm, and blood pressure, are monitored second by second on screens.

Diagnosis and Monitoring: How Is the Process Managed in the Hospital?

Monitoring a patient in a medical coma is a multifaceted process requiring advanced technology. Physicians use an EEG (Electroencephalography) machine continuously or intermittently to see if the brain's electrical activity is sufficiently suppressed. In cases where intracranial pressure is high, a thin sensor placed inside the skull measures the pressure in real-time.

Arterial blood gas analysis is performed several times a day to evaluate the oxygen and carbon dioxide levels in the patient's blood. Also, to prevent bedsores (pressure ulcers) that can occur due to lying still for a long time, the patient's position is changed every two hours. The intensive care team regularly clears secretions from the airways to prevent fluid buildup in the patient's lungs. For more detailed information about these meticulous steps taken during a hospital stay, you can review our article titled How Does the Intensive Care Process Work?.

The Waking Process of an Intubated Patient: When Will They Wake Up?

The answer to the question most wondered by patients' relatives—when will the induced patient wake up?—depends on the patient's recovery speed and the time it takes to eliminate accumulated drugs from the body. Physicians initiate the waking process when they are convinced that the primary disease has regressed and intracranial pressure has returned to normal. This process does not happen like in the movies, where the patient suddenly opens their eyes and starts talking.

The waking phase begins by gradually reducing the dose of sedative and anesthetic drugs given intravenously. After the medications are stopped, it can take hours or sometimes days for the patient to regain consciousness. During this period, the patient starts breathing on their own, and trials of weaning from the ventilator (extubation) are conducted. It is quite normal for the patient to have difficulty perceiving their surroundings, experience agitation (restlessness), or see hallucinations during the waking phase. You can check our What Does Intubated Mean? guide for the details of intubation and the steps of weaning off the machine.

Possible Complications and Risk Groups

Although a medical coma is a life-saving intervention, prolonged immobility and intensive care conditions can bring some complications. One of the most common problems is ICU-acquired muscle weakness. Muscles that are not used for days waste away quickly, which is why patients need physical therapy and rehabilitation support after waking up.

In addition, being connected to a ventilator for a long time increases the risk of lung infection (ventilator-associated pneumonia). There is also a risk of blood clot formation in the leg veins (deep vein thrombosis) due to immobility; to prevent this, patients are given blood thinners and wear compression stockings. Individuals over the age of 65, diabetic patients, and those with weakened immune systems are at a higher risk for these complications. The temporary mental confusion seen after waking, known as "ICU delirium," is another process that must be managed with patience.

Emergencies: When to Call 112?

Although the decision for a medical coma is made in the hospital, the path leading to this process usually begins with sudden emergencies. When you see signs of life-threatening danger in someone around you, calling the 112 Emergency Call Center without wasting time is of critical importance to prevent brain damage.

Seek medical help immediately if you encounter any of the following symptoms:

• The person suddenly loses consciousness and does not respond to voices.
• Severe head trauma, such as falling from a height or a traffic accident.
• Epileptic seizures lasting longer than five minutes or recurring without the person regaining consciousness.
• Severe shortness of breath accompanied by bruising on the lips and fingertips.
• A sudden onset of the most severe headache the person has ever experienced in their life.

Intensive Care Process at BHT CLINIC İstanbul Tema Hastanesi

Treating critical illnesses requires an advanced technological infrastructure and an experienced healthcare team. The Intensive Care unit at BHT CLINIC İstanbul Tema Hastanesi is a tertiary (highest level) center with international quality standards. Our Adult, Coronary, and Neonatal intensive care units provide uninterrupted and safe life support 24/7.

Medical coma and intubation processes are meticulously managed by our specialist physicians using state-of-the-art ventilators and central monitoring systems. Our isolation rooms, designed to minimize the risk of infection, keep our patients' safety at the highest level. Furthermore, transparently and regularly informing patient relatives about the process is one of our hospital's primary principles.

Frequently Asked Questions

What is the difference between a medical coma and a normal coma?

A normal coma is an involuntary loss of consciousness that develops as a result of structural damage to the brain, such as trauma, bleeding, or lack of oxygen. A medical coma, on the other hand, is a controlled state of sleep induced by physicians giving anesthetic drugs to protect the patient, which is reversible once the medications are stopped.

Can a patient in an induced coma hear their surroundings?

Since patients in a medical coma are in a state of deep unconsciousness, they are not expected to clearly perceive or remember what is spoken around them. However, as they transition to the waking phase and the effect of the drugs decreases, it has been observed that familiar voices can calm the patient.

How long does a medical coma last?

This duration depends entirely on the patient's underlying disease and the brain's need for healing. While a few days may be sufficient in some cases, the process can continue for weeks in severe head traumas or severe lung failures.

Is the waking process of an intubated patient painful?

Patients continue to receive pain-relieving (analgesic) medications during the waking process, so the patient is not expected to feel severe pain. However, a slight feeling of discomfort and difficulty swallowing due to the breathing tube in the throat is normal.

Does the patient return to normal immediately after waking up?

No, the waking process and subsequent recovery take time. Muscle weakness due to prolonged bed rest and temporary mental confusion (delirium) are common. The physical therapy and rehabilitation process is highly important for the patient to regain their former functions.

To get reliable support regarding the health processes of yourself or your loved ones and to consult with our specialist physicians, you can easily book through our appointment page and reach our 24/7 call center.

This article is for informational purposes only; please be sure to consult your physician for diagnosis and treatment.