Therefore, your PR interval may or may not be short and I wouldn't worry until you receive a full report. The PR interval is short in children and lengthens as we get older. A normal value in adults is 120 to 200 milliseconds. It is however shorter than 120ms in approximately 2 to 4% of the adult population.
It is SaO2 that measures oxygen saturation of hemoglobin, and it should be clear that it depends on the partial pressure of arterial oxygen. If PaO2 drops, there's less dissolved oxygen, and therefore less saturation of hemoglobin with oxygen.
Partial pressure of carbon dioxide (p CO 2) is a measure of the pressure exerted by that small portion (â 5 %) of total carbon dioxide in blood that is dissolved in the aqueous phase of plasma and blood cell cytoplasm. The measurement is made using a CO 2 specific pH electrode. In health, p CO 2 of arterial blood is maintained within the range of 35-45 mm Hg; p CO 2 of venous blood is a little higher, 41-51 mmHg. Most of the carbon dioxide (90%) is transported in blood as plasma bicarbonate. This parameter is calculated.