What is weaning?
If a patient is temporarily unable to breathe on their own, doctors use mechanical ventilation.
The reasons for this can vary widely.
- For example, mechanical ventilation is routinely used during surgery under general anesthesia.
- But the procedure is also necessary in cases of severe injuries, poisoning, or respiratory arrest. In this process, medical professionals deliver a mixture of breathing gases directly into the lungs without the patient’s body actively assisting in breathing.
After short-term ventilation lasting just a few hours—as is typical during surgery—no special weaning is necessary. Natural breathing resumes on its own once the anesthesia wears off.
If ventilation lasts longer than a week, the respiratory muscles weaken. Patients with damaged respiratory muscles or lungs are unable to breathe on their own. To enable independent breathing, patients must gradually train this ability.
This process is called weaning.
Weaning refers to the step-by-step process of transitioning from a ventilator back to independent breathing @ Jorge Ferreiro /AdobeStock
The Weaning Process
If a patient has been on mechanical ventilation for a very long time, weaning presents a major challenge. Various techniques are used in this process:
In assisted spontaneous ventilation, ventilator support is gradually reduced, and spontaneous breathing gradually resumes.
Controlled alternations between phases of mechanical ventilation and spontaneous breathing also frequently occur. During these alternations, the respiratory muscles must take over breathing for a short time but can then rest again while the ventilator takes over.
The periods of spontaneous breathing gradually become longer and longer. In this way, the patient trains their respiratory muscles. This continues until breathing is fully functional. Depending on the individual case, additional measures are used to facilitate breathing.
These include, for example:
- Body positions that make breathing easier
- A tracheal cannula, a short tube that keeps the trachea open and thus reduces breathing resistance
- Measures to reduce secretions in the airways, such as inhalations, suctioning, or assistance with coughing up secretions
- Physical therapy exercises to activate the diaphragm as well as the rest of the body
- Reduction of lung hyperinflation (in certain lung diseases)
- Tapering of sedation (in patients in an induced coma)
It is important that physicians maintain detailed records of the weaning procedures and closely monitor the patient.
When and where is weaning used?
After minor surgeries, doctors check the patient’s breathing in the recovery room. In such cases, there are usually no problems.
If ventilation has been ongoing for a longer period, doctors perform weaning in the intensive care unit. For more complicated cases, some hospitals have special weaning units.
Some cities also have dedicated weaning centers that specialize exclusively in weaning patients off ventilation.
During weaning, the patient gradually relearns to breathe independently @ Ralf Geithe /AdobeStock
Who performs weaning?
Since 2004, a new profession has existed in Germany: the respiratory therapist.
Respiratory therapists work in a variety of settings:
- In weaning units
- In the intensive care unit, or
- In preparation for home ventilation
Respiratory therapists are specialists in caring for patients with breathing difficulties. They work closely with pulmonologists. They provide care for patients in all areas related to breathing.
Respiratory therapists are well-suited for complex cases. If weaning proceeds without complications, the staff in the intensive care unit or recovery room performs the weaning.
Possible Complications During Weaning
Mechanical ventilation saves the lives of many patients, but it also carries significant risks. For example, it increases the likelihood of inflammation and infections of the respiratory organs.
Ventilation that is too aggressive can damage the lungs. That is why doctors begin the weaning process as soon as possible. Here, too, monitoring the patient is very important so that staff can react quickly if complications arise. Monitoring focuses on heart rate and blood oxygen saturation.
Psychological issues can also be problematic: The feeling of being unable to breathe triggers severe anxiety in many patients. This, in turn, leads to a deterioration in respiratory function.
In some cases, patients are given sedatives to alleviate anxiety and allow them to benefit from the training effect of breathing on their own.
Weaning is not successful for all patients. About one percent of those affected are permanently dependent on mechanical ventilation because they can no longer breathe on their own.
This is the case when the lungs or other respiratory organs have suffered permanent damage. In such cases, weaning serves to reduce mechanical ventilation to the absolute minimum necessary.
Ventilation methods that the patient can use at home are then employed. The goal is to achieve the greatest possible independence for the patient.
