![]() The signs and symptoms of ongoing infection include increasing pain, erythema, and the presence of pus. The primary outcome was a combination of sonographic resolution and clinical resolution of the signs and symptoms of ongoing infection at day 7. Patients were followed up at 48 hours (in person by a clinician) and on day 7 (telephone follow-up by research staff). Bedside ultrasonography was performed pre- and postintervention to confirm the presence or absence of an abscess cavity. Purulence obtained from the abscess was cultured to identify the causative organism. Patients with uncomplicated superficial abscesses were randomized to incision and drainage with packing or ultrasonographically guided needle aspiration. This study was a nonblinded randomized controlled trial. Our hypothesis is that ultrasonographically guided needle aspiration is equivalent to incision and drainage in treating simple skin and soft tissue abscesses. Incision and drainage is considered the primary intervention however, some clinicians prefer ultrasonographically guided needle aspiration because it represents a less invasive alternative. The incidence of skin and soft tissue infections has increased dramatically during the last decade, in part because of increased prevalence of community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA).
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