- Brainstem disease
- Encephalitis (inflammation of the brain)
- Hypothermia (a low body temperature, which is a medical emergency that occurs when your body loses heat faster)
- Metabolic disorders, including:
- Nervous system disorders such as congenital central alveolar hypoventilation (a disease that affects normal breathing)
- Sedative overdose
- Sleep apnea (a potentially serious sleep disorder in which breathing repeatedly stops and starts)
- Spinal cord injuries or disorders such as:
- Thoracic cage disorders such as:
- Toxins, poisonings, and drugs such as botulism and tetanus
- Upper airway disorders
- Hypoventilation: Inadequate ventilation causes hypercapnia.
- Rebreathing: Faulty breathing circuits can cause rebreathing of the exhaled air leading to increased CO2.
- Increased CO2 production: In some cases, the body can produce excessive CO2.
- Increased dead space: Dead space is the volume of breath that doesn’t participate in the gas exchange. It is negligible in a healthy, awake person.
What is hypercapnia?
Normally, when you breathe, you take in oxygen and produce carbon dioxide (CO2) as a waste product. The blood takes the oxygen from the lungs to the tissues. It also transports CO2 from the tissues to the lungs from where it is exhaled or breathed out. Hypercapnia is an elevation of CO2 in your bloodstream. It is mainly seen in people with chronic obstructive pulmonary disease (COPD). In hypercapnia, the pH of the blood changes, making it too acidic. Hypercapnia may develop slowly or suddenly. If hypercapnia occurs gradually, the body compensates by making the kidneys work harder. Your kidneys release and reabsorb bicarbonate to keep your blood’s pH balanced.
What are the symptoms of hypercapnia?
The symptoms of hypercapnia depend on the severity of the condition:
- Mild to moderate hypercapnia:
- Acute hypercapnia:
- Severe hypercapnia:
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