Contraindications to CPAP (Continuous Positive Airway Pressure) mainly include absolute contraindications and relative contraindications. Let’s first explain in detail the two important medical terms, absolute contraindications and relative contraindications. They are both used to describe the risks and benefits of a patient’s condition that need to be considered before a specific treatment (such as medication, surgery, examination, vaccine, etc.). In simple terms, it is to answer the question “Can or should this patient receive this treatment?”
Absolute contraindications: When a condition occurs, the known risks of treatment significantly and definitely outweigh any possible benefits. In simple terms, the risk is extremely high and may be fatal or cause serious, irreversible damage. For example, patients who are allergic to penicillin cannot use penicillin drugs.
Relative contraindications: refers to the situation when the risk of a medical intervention is relatively high and may outweigh its potential benefits. However, these risks are relative and controllable, or under certain specific conditions (such as lack of alternatives, special emergency conditions, etc.), after careful evaluation, if the benefits significantly outweigh the risks, it can still be considered. For example, for patients with mild asthma who need general anesthesia for surgery, the doctor will evaluate the asthma and anesthesia plan before deciding whether to perform the surgery, because anesthesia and tracheal insertion can cause the patient’s asthma to flare up and cause suffocation.
Absolute contraindications refer to situations that may lead to serious consequences due to the use of CPAP, such as untreated pneumothorax, severe bullous lungs, craniocerebral injury with cerebrospinal fluid leakage, etc. Relative contraindications require careful use after weighing the pros and cons, such as severe nasal obstruction, claustrophobia, hemodynamic instability, etc. The core of CPAP contraindications is to assess whether the patient is at risk of worsening of the condition due to positive pressure ventilation.
1.Absolute Contraindications
Untreated pneumothorax or tension pneumothorax
CPAP may increase intrathoracic pressure, leading to expansion of pneumothorax or mediastinal shift, causing respiratory and circulatory failure.
Severe bullae or lung cysts
Continuous positive airway pressure may cause bullae to rupture, induce pneumothorax or aggravate lung damage.
Head injury or skull defect
Positive airway pressure may enter the brain through the nasal cavity or skull base defects, leading to increased intracranial pressure or increased risk of infection.
Severe respiratory failure
When the patient is unable to trigger the CPAP machine or has apnea, invasive mechanical ventilation is required.
2.Relative Contraindications
Severe nasal obstruction
If there is a deviated nasal septum, nasal polyps, or acute sinusitis, the positive airway pressure ventilation may be ineffective or the patient may not tolerate it, so the nasal problem needs to be treated first.
Claustrophobia or inability to tolerate masks
Some patients cannot adapt to wearing masks due to psychological or physiological reasons and need to try gradual adaptation or switch to other treatment methods.
Hemodynamic instability
When patients with hypotension and heart failure use CPAP, the positive intrathoracic pressure may reduce venous return and aggravate circulatory disorders.
Frequent vomiting or flatulence
Positive pressure may cause gas to enter the gastrointestinal tract, leading to abdominal distension, reflux, and even aspiration. Pressure parameters need to be monitored and adjusted.
Acute otitis media or ear infection
Positive pressure may affect the middle ear through the Eustachian tube, potentially increasing inflammation or pain.
3.Special Circumstances
Comatose patients
If the airway is not protected, endotracheal intubation or adjustment of ventilation mode is required.
Facial trauma or surgery
The mask may compress the wound and should be used with caution after assessing the wound healing condition.
Children
Specific equipment should be selected based on age and weight, and compliance and pressure tolerance should be closely monitored.
