Nocturia-nocturia, nighttime urination, occurs in the elderly, because when the client is at rest in the supine position, the heart is able to pump blood through the kidneys more efficiently, facilitating the excretion of urine. this factor, combined with weakened bladder and urethral muscles, contributes to nocturnal micturition.
benign prostatic hypertrophy is a common cause of urinary retention and obstruction in elderly males. it may also cause the symptom of nocturia.
oliguria is decreased urinary output.
polyuria is increased urination which occurs throughout the day and is not related to aging or rest in a supine position.