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.
Arterial oxygen partial pressure (P a O 2). 11 -13 kPa or 75 -100 mmHg. A low PaO 2 indicates that the patient is not oxygenating properly, and is hypoxemic. (Note that a low PaO 2 is not required for the patient to have hypoxia .) At a P a O 2 of less than 60 mm Hg, supplemental oxygen should be administered.ecent studies suggest that the Î±-stat method is superior. 1  pH-stat: The pH and other ABG results are measured at the patient's actual temperature. 2  The goal is to maintain a pH of 7.40 and the arterial carbon dioxide tension (paCO 2) at 5.3 kPa (40 mmHg) at the actual patient temperature.