Urosepsis: Definition, Diagnosis and Treatment
Urosepsis: Definition, Diagnosis and Treatment
Urosepsis: Definition, Diagnosis and Treatment
Treatment
Review literature: (Hotchkiss and Karl, 2003) (Tauchnitz, 1991).
Definition of Urosepsis
Urosepsis is a systemic reaction of the body (SIRS) to a bacterial infection of the urogenital
organs with the risk of life-threatening symptoms including shock.
Tachycardia
Tachypnea
Fever or hypothermia
Signs of organ hypoperfusion (oliguria, hypoxemia, increased LDH)
Leukopenia or leukocytosis
Definition of sepsis
Sepsis is the presence of SIRS with clinical signs of a bacterial infection. Urosepsis is the
presence of SIRS with clinical signs of a bacterial infection involving the urogenital organs.
Septic shock
Epidemiology of Sepsis
Cardial infections:
Respiratory infections:
Tonsillitis, oral cavity floor phlegmone. Bacterial spectrum: Streptococcus pyogenes, Staph.
aureus ...
Dermal infections:
Nosocomial infections:
Catheter associated infections (central venous catheters, bladder catheter), implants, wound
infection, pneumonia. Diverse bacterial spectrum.
Pathogenesis of Urosepsis
Patients with sepsis suffer initially from an excessive immune response, which leads later in the
course of sepsis to a status of immunosuppression. One reason for the transition from
hyperinflammation to immunosuppression is the exhaustion of proinflammatory cytokines,
apoptosis of lymphocytes and the formation of an anergy.
The presence of bacteria induces an excessive immune reaction that damages the patients
organism. Although the responsible cytokines in the immune response are known in part (TNF-α,
interleukin 1 and 2, interferon-γ), clinical studies with a blocking of these cytokines did not
improve the prognosis.
Anergy is a state of the immune system not responding to immunogenic stimuli. Anergy is
triggered by e.g. apoptosis of lymphocytes.
A series of genetic changes (mutations, polymorphisms ...) were identified in the context of
increased mortality due to infectious diseases and sepsis.
Cellular mechanisms of organ dysfunction with sepsis:
Autopsy studies were not able to identify significant changes in kidney cells, heart muscle cells
or liver cells, which could explain the severe organ dysfunction responsible for mortality. This
phenomenon of decreased cell function ("cell stunning or cell hibernating") is caused by
cytokines and metabolites of sepsis. Organ function may recover to a large extent after survival
of sepsis.
Local symptoms depend on the underlying cause of infection: flank pain, abdominal tenderness,
scrotal pain, ....
Fever, chills, hyperventilation, tachycardia and hypotension are the classic symptoms.
Hypothermia indicates a poor prognosis. Further symptoms are impairment of consciousness,
confusion, oliguria or anuria.
Diagnosis of Urosepsis
Vital signs:
Heart rate, blood pressure, respiratory rate, urine output, and vigilance are important parameters
for assessing the prognosis and for the initiation of intensive care measures.
Blood cultures:
Blood cultures should be done before antibiotic treatment is started. Ideally, several aerobic and
anaerobic blood cultures are taken when fever is rising.
Depending on the suspected site of infection: urine culture, pus from abscess, sputum, faeces,
wound secretions, cerebrospinal fluid .... Ideally before antibiotic treatment is started.
Laboratory tests:
Blood count, clotting tests with AT III and fibrinogen, CRP, liver tests, creatinine, blood gas
analysis. Possibly procalcitonin as a marker for sepsis.
Imaging in Urosepsis:
Ultrasound of the urogenital organs, abdominal CT and chest x-ray. Depending on the clinical
situation further imaging such as CCT or echocardiography might be necessary.
Treatment of Urosepsis
Causal Treatment of Urosepsis
If possible, specific treatment of the diagnosed infection should be started as soon as possible:
After obtaining blood cultures and local cultures (see above), a calculated parenteral antibiotic
therapy is begun: e.g. Amoxicillin/clavulanic acid in combination with gentamicin,
cephalosporins of the 3rd generation or reserve antibiotics such as imipenem or meropenem if a
difficult resistance situation is suspected. Anaerobic infections are possible in peritonitis, wound
infection or Fournier's gangrene and may require the use of e.g. metronidazole.
Aggressive volume therapy, control for sufficient oxygen carriers and vasopressor therapy at the
beginning of urosepsis improve the prognosis. The aim is to achieve a balance between oxygen
consumption and oxygen transport within six hours; this is controlled via the normalization of
the central venous oxygen saturation, lactate concentration, base excess (BE) and pH. Important
is a liberal volume therapy and the transfusion of packed red blood cells in anemia.
Catecholamins:
If the substitution of volume, oxygen and hemoglobin is not effective enough to reach a balance
between oxygen consumption and oxygen transport, the administration of vasoactive and
positive inotropic agents such as noradrenaline and adrenaline is necessary.
Mechanical ventilation and renal replacement therapy (hemofiltration) are often necessary.
References