Predictors of Oral Antibiotic Treatment Failure in Emergency Department Patients With Cellulitis
Predictors of Oral Antibiotic Treatment Failure in Emergency Department Patients With Cellulitis
The term cellulitis is a medical term describing a bacterial infection of the skin and
 tissues beneath the skin. Although it is usually easily treated with antibiotics given either
 orally or through a vein (intravenously), knowing which route of antibiotic treatment to
 prescribe to a person attending an Emergency Department with cellulitis is not clear.

 A Clinical Prediction rule (CPR) is a decision-making tool that comes from original research
 as opposed to the opinion of experts. We intend to create a preliminary CPR to decide which
 patients require oral and which patients require intravenous antibiotics for cellulitis from
 their first visit to an emergency department. The aim of this is to provide safer care by
 reducing the risk of a patient returning to the hospital with a worsening infection. It will
 also promote more cost-effective care by reducing hospital re-attendance rates and wasted
 antibiotics.

 Patients attending the department with cellulitis who are suitable for oral antibiotic
 treatment will be enrolled into this study. A separate doctor will re-examine at least 10% of
 study participants in order to reduce bias. A set of physical signs and symptoms will be
 recorded from each patient in order to determine which ones are associated with them
 "failing" prescribed oral treatment. A study investigator will then phone the patient after
 14 days to see whether they are better or whether they required intravenous antibiotics to
 get better.
Inclusion Criteria:

 -  Age >16 years

 -  Suitable for treatment with flucloxacillin 500mg -1gram qds monotherapy or a suitable
 alternative for penicillin allergic patients as listed in the local prescribing
 guidelines.

 -  Appearance of typical, plaque-like area of erythema over any body part excluding the
 perineum within the preceding 5 days with any 2 of the following signs:

 -  1.Increased warmth over affected area

 -  2.Swelling of affected area

 -  3.Pain over affected area

 -  4.Regional lymphadenopathy

 Exclusion Criteria:

 -  Requirement for IV antibiotics as decided by the treating clinician.

 -  Age less than 16 years.

 -  No telephone or access to a telephone.

 -  Abscess alone without co-existing signs of cellulitis

 -  Mammalian bite wounds.

 -  Infected diabetic foot ulcer

 -  Necrotising soft tissue infections.

 -  Perineal cellulitis.

 -  Suspected septic arthritis or osteomyelitis.

 -  Decubitus ulcers.

 -  Bilateral cellulitis (as this entity rarely exists).

 -  Acute lipodermatosclerosis.

 -  Acute dermatitis.

 -  Venous stasis dermatitis.

 -  Deep vein thrombosis.

 -  Pregnancy.

 -  Cognitive impairment.

 -  Any patient who through language barrier or diminished capacity is unable to
 understand the scope of the study