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Oliguria or hypouresis is the low output of urine specifically more than 80 ml/day but less than 400ml/day. [1] The decreased output of urine may be a sign of dehydration, kidney failure, hypovolemic shock, hyperosmolar hyperglycemic nonketotic syndrome (HHNS), multiple organ dysfunction syndrome, urinary obstruction/urinary retention, diabetic ketoacidosis (DKA), pre-eclampsia, and urinary ...
In voluntary urination, the bladder's normally relaxed detrusor muscle contracts to squeeze urine from the bladder. One study, of 109 children diagnosed with giggle incontinence at Schneider Children's Hospital in New York, concluded that the cause of giggle incontinence is involuntary contraction of the detrusor muscle induced by laughter. [5]
Conditions involving low output of urine are oliguria (< 400 mL/day) and anuria (< 100 mL/day). The first step in urine formation is the filtration of blood in the kidneys. In a healthy human, the kidney receives between 12 and 30% of cardiac output , but it averages about 20% or about 1.25 L/min.
Among children, urinary tract infections are most common in uncircumcised males less than three months of age, followed by females less than one year. [28] Estimates of frequency among children, however, vary widely. In a group of children with a fever, ranging in age between birth and two years, 2–20% were diagnosed with a UTI. [28]
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Urinary incontinence (UI), also known as involuntary urination, is any uncontrolled leakage of urine. It is a common and distressing problem, which may have a large impact on quality of life . [ 1 ] Urinary incontinence is common in older women and has been identified as an important issue in geriatric health care.
If fluid intake/outflow is around 1.5 litres per day, this would typically be performed roughly three times per day, i.e. roughly every six to eight hours during the day, more frequently when fluid intake is higher and/or bladder capacity lower. For acute urinary retention, treatment requires urgent placement of a urinary catheter.
A 2014 meta-analysis found that, for elderly males with LUTS, sitting to urinate meant there was a decrease in post-void residual volume (PVR, ml), increased maximum urinary flow (Qmax, ml/s), which is comparable with pharmacological intervention, and decreased the voiding time (VT, s). [19]