Uti Case Study
Uti Case Study
Uti Case Study
• A common type of infection caused by bacteria that travel up the urethra to the bladder
• It can happen along the urinary tract: the kidney (pyelonephritis), the bladder (cystitis), urethra
(urethritis)
Complicated or Uncomplicated
Primary or Recurrent
-depends on whether the infection is occurring for the first time or is a repeated event.
Uncomplicated UTI
Cystitis
Pyelonephritis
Complicated UTI
• also caused by bacteria but they tend to be more severe, more difficult to treat, and
recurrent.
• Recurrences can occur in patients with complicated UTI if the underlying structural or
anatomical abnormalities are not corrected.
• Some anatomical or structural abnormality that impairs the ability of the urinary tract to
clear out urine and therefore bacteria
• Catheter use in the hospital setting or chronic indwelling catheter in the outpatient setting
• Bladder and kidney dysfunction, or kidney transplant (especially in the first three months
of transplant)
Recurrent UTI
• Most women who have had an uncomplicated UTI have occasional recurrences
Reinfection
• occurs several weeks after antibiotic treatment has cleared up the initial episode
Relapse
• diagnosed when a UTI recurs within 2 weeks of treatment of the first episode and is due
to treatment failure
ASYMPTOMATIC UTI
• when a person has no symptoms of infection but significant number of bacteria have
colonised the urinary tract
EPIDEMIOLOGY
Urinary tract infections are the most frequent bacterial infection in women. They occur most frequently
between the ages of 16 and 35 years, with 10% of women getting an infection yearly and more than 40–
60% having an infection at some point in their lives. Recurrences are common, with nearly half of people
getting a second infection within a year. Urinary tract infections occur four times more frequently in
females than males. Pyelonephritis occurs between 20–30 times less frequently. They are the most
common cause of hospital acquired infections accounting for approximately 40%. Rates of asymptomatic
bacteria in the urine increase with age from two to seven percent in women of child bearing age to as high
as 50% in elderly women in care homes. Rates of asymptomatic bacteria in the urine among men over 75
are between 7-10%Asymptomatic bacteria in the urine occurs in 2% to 10% of pregnancies.
Urinary tract infections may affect 10% of people during childhood. Among children urinary tract
infections are the most common in uncircumcised males less than three months of age, followed by
females less than one year. Estimates of frequency among children however vary widely. In a group of
children with a fever, ranging in age between birth and two years, two to 20% were diagnosed with a UTI.
SIGNS AND SYMPTOMS
The most common symptoms are burning with urination and having to urinate frequently (or an
urge to urinate) in the absence of vaginal discharge and significant pain. These symptoms may
vary from mild to severe and in healthy women last an average of six days. Some pain above the
pubic bone or in the lower back may be present. People experiencing an upper urinary tract
infection, or pyelonephritis, may experience flank pain, fever, or nausea and vomiting in addition
to the classic symptoms of a lower urinary tract infection. Rarely the urine may appear bloody or
contain visible pus in the urine.
Children
In young children, the only symptom of a urinary tract infection (UTI) may be a fever. Because
of the lack of more obvious symptoms, when females under the age of two or uncircumcised
males less than a year exhibit a fever, a culture of the urine is recommended by many medical
associations. Infants may feed poorly, vomit, sleep more, or show signs of jaundice. In older
children, new onset urinary incontinence (loss of bladder control) may occur.
Elderly
Urinary tract symptoms are frequently lacking in the elderly. The presentations may be vague
with incontinence, a change in mental status, or fatigue as the only symptoms, while some
present to a health care provider with sepsis, an infection of the blood, as the first symptoms.
Diagnosis can be complicated by the fact that many elderly people have preexisting incontinence
or dementia.
It is reasonable to obtain a urine culture in those with signs of systemic infection that may be
unable to report urinary symptoms, such as when advanced dementia is present. Systemic signs
of infection include a fever or increase in temperature of more than 1.1 °C (2.0 °F) from usual,
chills, and an increase white blood cell count.
CAUSE
In straightforward cases, a diagnosis may be made and treatment given based on symptoms alone
without further laboratory confirmation. In complicated or questionable cases, it may be useful to
confirm the diagnosis via urinalysis, looking for the presence of urinary nitrites, white blood
cells (leukocytes), or leukocyte esterase. Another test, urine microscopy, looks for the presence
of red blood cells, white blood cells, or bacteria. Urine culture is deemed positive if it shows a
bacterial colony count of greater than or equal to 103 colony-forming units per mL of a typical
urinary tract organism. Antibiotic sensitivity can also be tested with these cultures, making them
useful in the selection of antibiotic treatment. However, women with negative cultures may still
improve with antibiotic treatment. As symptoms can be vague and without reliable tests for
urinary tract infections, diagnosis can be difficult in the elderly.
• Urinalysis
- is a urine test to look for white blood cells and other signs associated with infection.
- A Gram stain and culture of the material from an infected site are the most commonly
performed microbiology tests used to identify the cause of a bacterial infection.
- Sensitivity analysis, also called susceptibility testing, helps find the right antibiotic to
kill an infecting microorganism.
• Intravenous pyelogram (IVP) – this injected dye allows doctors to see your entire
urinary tract
• Voiding cystourethrogram
• Urodynamics
MEDICATIONS
For those with recurrent infections, taking a short course of antibiotics when each infection
occurs is associated with the lowest antibiotic use. A prolonged course of daily antibiotics is also
effective. Medications frequently used include nitrofurantoin and
trimethoprim/sulfamethoxazole(TMP/SMX). Methenamine is another agent used for this purpose
as in the bladder where the acidity is low it produces formaldehyde to which resistance does not
develop. Some recommend against prolonged use due to concerns of antibiotic resistance.
In cases where infections are related to intercourse, taking antibiotics afterwards may be useful.
In post-menopausal women, topical vaginal estrogen has been found to reduce recurrence. As
opposed to topical creams, the use of vaginal estrogen from pessaries has not been as useful as
low dose antibiotics. Antibiotics following short term urinary catheterization decreases the
subsequent risk of a bladder infection. A number of vaccines are in development as of 2011.
NURSING INTERVENTION/MANAGEMENT
Antispasmodic agents may relieve bladder irritability and analgesics and application of heat
help relieve pain and spasm. Fluids. The nurse should encourage the patient to drink liberal
amounts of fluids to promote renal blood flow and to flush bacteria from the urinary tract.
TREATMENT
The mainstay of treatment is antibiotics. Phenazopyridine is occasionally prescribed during the
first few days in addition to antibiotics to help with the burning and urgency sometimes felt
during a bladder infection. However, it is not routinely recommended due to safety concerns with
its use, specifically an elevated risk of methemoglobinemia (higher than normal level of
methemoglobin in the blood). Acetaminophen (paracetamol) may be used for fevers. There is no
good evidence for the use of cranberry products for treating current infections. Uncomplicated
infections can be diagnosed and treated based on symptoms alone. Antibiotics taken by mouth
such as trimethoprim/sulfamethoxazole (TMP/SMX), nitrofurantoin, or fosfomycin are typically
first line. Cephalosporins, amoxicillin/clavulanic acid, or a fluoroquinolone may also be used.
However, resistance to fluoroquinolones among the bacterial that cause urinary infections has
been increasing. The FDA recommends against the use of fluoroquinolones when other options
are available due to higher risks of serious side effects. These medications substantially shorten
the time to recovery with all being equally effective. A three-day treatment with trimethoprim,
TMP/SMX, or a fluoroquinolone is usually sufficient, whereas nitrofurantoin requires 5–7 days.
Fosfomycin may be used as a single dose but has been associated with lower rates of efficacy.
Complicated UTIs are more difficult to treat and usually requires more aggressive evaluation,
treatment and follow-up. It may require identifying and addressing the underlying complication.
Increasing antibiotic resistance is causing concern about the future of treating those with
complicated and recurrent UTI.
References:
http://ajcp.oxfordjournals.org/content/137/5/778
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071654/
http://www.ncbi.nlm.nih.gov/pubmed/10890258