title: Nocturnal polyuria and natriuresis in male patients with nocturia and lower urinary tract symptoms.
abstract: OBJECTIVE
  We investigated the circadian variation in urine output, plasma angiotensin II, aldosterone, atrial natriuretic peptide, arginine vasopressin and blood pressure.
  
  
  METHODS
  We studied 17 elderly men with nocturia and lower urinary tract symptoms, and 10 age matched controls without nocturia.
  
  
  RESULTS
  Of the 17 patients studied 11 had a lack of diurnal variation in urine output and increased nocturnal urine production associated with increased nocturnal sodium excretion, and 6 had a diurnal variation in urine output comparable to controls.
  
  
  CONCLUSIONS
  Nocturia in a large proportion of elderly men with lower urinary tract symptoms is caused by nocturnal polyuria and natriuresis.
authors.affiliation: Department of Urology and Research Laboratory C, Skejby University Hospital, Aarhus N, Denmark.
authors.forename: T B
authors.initials: TB
authors.lastname: Matthiesen
authors.forename: S
authors.initials: S
authors.lastname: Rittig
authors.forename: J P
authors.initials: JP
authors.lastname: Nørgaard
authors.forename: E B
authors.initials: EB
authors.lastname: Pedersen
authors.forename: J C
authors.initials: JC
authors.lastname: Djurhuus
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure; D002940:Circadian Rhythm; D006801:Humans; D008297:Male; D008875:Middle Aged; D009318:Natriuresis; D011141:Polyuria / Q000150:complications* / Q000378:metabolism / Q000503:physiopathology; D011470:Prostatic Hyperplasia / Q000150:complications* / Q000378:metabolism; D012964:Sodium / Q000652:urine; D014555:Urination Disorders / Q000209:etiology* / Q000378:metabolism / Q000503:physiopathology
chemical_list: D012964:Sodium