Power is the probability that a study will reject the null hypothesis. difference between the null and alternative hypotheses. level of significance, and the null vs. alternative difference. a numeric example of power and sample size estimation for the one-sample case.
During the procedure the patient is unconscious and unaware of the need to urinate. After the procedure, however, it may not be safe for the patient to walk. They may be too sick to take care of their own bathroom needs or their surgeon may feel that a catheter is best for their particular recovery.
Urine flow is blocked. The doctor will have to change the bag or the Foley catheter or both. The urethra begins to bleed. The doctor will have to monitor the bleeding. The Foley catheter may introduce an infection into the bladder. The risk of infection in the urine increases with the number of days the catheter is in place. If the balloon is opened before the Foley catheter is completely inserted into the bladder, bleeding, damage and even rupture of the urethra can occur. In some individuals, long-term permanent scarring and strictures of the urethra could occur. Bladder spasms can occur when a catheter is placed.