My father was admitted in a hospital earlier due to covid,he is
diabetes and bp patient, his chest ct value was 22/25 at that time, he was constantly on the oxygen support and was maintaing oxygen 96 at approx 5 litres ...but can not remove oxygen for a while...why oxygen drops so quickly when not on oxygen support.his oxygen drops to approx 50 within few minutes.what is the reason behind this.