Oxygen Therapy Download PDF, 3.42MB, PDFOxygen is essential for life. Medical conditions such as lung, heart and sleep-related breathing disorders may result in lower oxygen levels in the blood. This could cause symptoms such as breathlessness, tiredness and reduced attention. This booklet will highlight how oxygen therapy provides you with extra oxygen during breathing to improve the oxygen levels in your blood. [Please download the PDF file if you are unable to view the image below.]