Urinary retention is the inability to empty the bladder. Dysuria means difficult urination. The absence of urinary output is called anuria. The inability to form urine is term â¦ ed anuria.
Some experts recommend changing your air filter as often as every 3,000 miles (4,828 kilometers), along with changing the oil [source: 2CarPros.com ].Others say that's a little too excessive and that you should simply use your judgment in visually spot-checking the air filter and change it out when it looks dirty.ome experts recommend changing your air filter as often as every 3,000 miles (4,828 kilometers), along with changing the oil [source: 2CarPros.com ].
Report Abuse. 1  Change filters regularly. Nasal Cannula should be replaced monthly. 2  No longer than 24 hours before changing. My dad had a rare form of asthma for 15 years and was on oxygen. 3  we told patients to change them every week and rinse them daily. Tubing should be changed every month OR when cinks develop. humidiifier bottle, if you have one should be filled twice daily and washed every few days.