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.
What is pulse oximetry? Pulse oximetry is a noninvasive method that enables the measurement of a personâs blood oxygen saturation, which is often referred to as SpO2 or âThe Fifth Vital Signâ (the first 4 being your pulse, temperature, blood pressure and respiratory rate).he ratio of red to infrared light that goes through the Pulse Ox âs photo diode indicates the percentage of oxygenated versus deoxygenated hemoglobin that your blood contains. This blood oxygen saturation is also called SpO2.