Intrapleural Alteplase-Tyloxapol vs Intrapleural Alteplase-DNase in Pleural Infection

Inclusion Criteria: Inclusion Criteria 1. Adult patient aged ≥ 18 years old 2. Patients with pleural infection (complex parapneumonic effusion or empyema) with poor pleural fluid drainage of ≤ 150 ml after 24 hours of chest drain insertion received either t-PA-DNAse or t-PA/Tyloxapol. 3. Clinical features consistent with pleural infection; fulfilling ≥ 2 of the following characteristics: i) Clinical evidence of infection, such as fever and or elevated C-reactive protein (CRP) or total white blood count (TWBC) ii) Complex pleural effusion proven by thoracic ultrasound is defined as the presence of fibrin strands or septations within the pleural cavity iii) Pleural fluid that fulfils at least one of the characteristics: * Frank Pus, * Exudative type of pleural effusion (according to light's criteria) * Gram stain or culture positive * Lactate dehydrogenase (LDH) \> 900U/L * Acidic with pH \< 7.2 * Glucose level \< 3.3 mmol/L Exclusion Criteria: 1. Incomplete data. 2. Medical records that cannot be retrieved.