The study will identify the epidemiological and treatment profiles of acute peritonitis in Italy

The primary objectives of the study are: (1) the identification of specific risk factors for in-hospital mortality, in order to perfect the clinical management of patients with complicated intra-abdominal infections (cIAIs); (2) the identification of specific risk factors for multi-drug resistant organisms (MDROs) isolation in patients with cIAIs, in order to improve the adequacy of empirical antimicrobial therapy.

The secondary objectives are: (1) the description of the clinical, diagnostic and treatment profiles of patients with cIAIs in Italian surgical departments; (2) the analysis of epidemiology and patterns of antimicrobial susceptibility of the microorganisms isolated in samples in intra-operative samples of peritoneal fluid or purulent exudate/discrete abscesses in patients with cIAIs; (3) the identification of specific risk factors for post-operative complications in patients with cIAIs.

Inclusion Criteria:

All consecutively hospitalized adult patients (older than 18 years of age) undergoing surgery, interventional drainage or conservative treatment, with diagnosis of cIAIs (defined as abdominal infections originating in an organ cavity, extending into the peritoneal space, and forming an abscess or peritonitis)

Exclusion Criteria:

Patients younger than 16 years-old, patients with pancreatitis or primary peritonitis

All patients with complicated intra-abdominal infections