Respiratory acidosis can be acute or chronic; the chronic form is asymptomatic, but the acute, or worsening, form causes headache, confusion, and drowsiness. Signs include tremor, myoclonic jerks, and asterixis. Diagnosis is clinical and with arterial blood gas and serum electrolyte measurements.
How does respiratory acidosis occur?
Respiratory acidosis is a condition that occurs when the lungs can’t remove enough of the carbon dioxide (CO2) produced by the body. Excess CO2 causes the pH of blood and other bodily fluids to decrease, making them too acidic.
What conditions increase ETCO2?
ETCO2 should increase as their respiratory rate decreases and their symptoms should improve. A number of life-threatening conditions also cause hyperventilation with low ETCO2. These include sepsis, pulmonary embolism, and diabetic ketoacidosis.
What happens when ETCO2 is low?
Low ETCO2 with other signs of shock indicates poor systemic perfusion, which can be caused by hypovolemia, sepsis or dysrhythmias. Cardiac arrest is the ultimate shock state; there is no circulation or metabolism and no CO2 production unless effective chest compressions are performed.
How is respiratory acidosis diagnosed?
Tests that may be done include:
- Arterial blood gas, which measures oxygen and carbon dioxide levels in the blood.
- Basic metabolic panel.
- Chest x-ray.
- CT scan of the chest.
- Pulmonary function test to measure breathing and how well the lungs are functioning.
What is respiratory acidosis and respiratory alkalosis?
Normally, the respiratory system keeps these two gases in balance. Respiratory alkalosis occurs when you breathe too fast or too deep and carbon dioxide levels drop too low. This causes the pH of the blood to rise and become too alkaline. When the blood becomes too acidic, respiratory acidosis occurs.
What causes increased CO2 production?
Illnesses, infections, and severe trauma can cause an alteration in the body’s metabolism, resulting in excess CO2 production. If your breathing can’t catch up with your need to exhale CO2 from your body, you can develop an elevated blood CO2 level.
What conditions increase EtCO2 what conditions decrease EtCO2?
Hypoventilation (reduced minute ventilation) causes an increase in etCO2. Hyperventilation (excess minute ventilation) causes a decrease in etCO2. Thus: if etCO2 and minute ventilation change in opposite directions, this suggests hypoventilation or hyperventilation.
Why does respiratory alkalosis occur?
Your body releases carbon dioxide when you exhale. When you breathe faster, the lower carbon dioxide level in your blood can lead to respiratory alkalosis. Respiratory alkalosis is usually caused by over-breathing (called hyperventilation) that occurs when you breathe very deeply or rapidly.
