In other acute situations patients may need a higher concentration of oxygen and a non-rebreathe mask or simple oxygen mask is often used. Flow rates of 1-4 litres per minute are used with nasal cannulas, equating to a concentration of approximately 24-40% oxygen.Flow rates of up to 6 litres can be given but this will often cause nasal dryness and can be uncomfortable for patients (British Thoracic Society, 2008).hey deliver oxygen in a variable manner; this means the amount of oxygen inspired depends on the patientâs breathing rate and pattern. For this reason they are not suitable for use in the acute phase of illness with patients who need controlled oxygen therapy.
If you paper file, it will take three to four weeks for the IRS to process the return and acknowledge your refund. If you e-file, you will get a notice of arrival within 24 hours and confirmation of refund within 72 hours.
How Long does it Take. 1  If you e-Filed your tax return your refund will generally be processed in about 1 week. 2  If you filed your tax return on paper your refund could take up to 7 weeks to process. You will need to enter your SSN, the tax year of the return you filed and the amount of the refund you are expecting. 2  Phone Lookup-Call (804) 367-2486 to check the status of your refund 24 hours a day, 7 days a week.