Dose Optimization by Pharmacokinetic/Pharmacodynamic of Antibiotics to Improve Clinical Outcome of Carbapenem Resistant Klebsiella Pneumoniae Bloodstream Infections in Critically Ill Patients at Phramongkutklao Hospital

Inclusion Criteria: 1. 20 years and older who admitted at Phramongkutklao Hospital 2. Patients who was diagnosed blood stream infection with CRKP between April 10th, 2023 to March 31st, 2024 (Prospective study) and January 1st, 2012 to March 31st, 2023 (Retrospective study); Historical group 3. Patients who had signs and symptoms at least 1 criteria following: 3.1. Patients who had signs and symptoms of Systemic Inflammatory Response Syndrome (SIRS) at least 2 criteria: * Temperature above 38 oC or below 36 oC * Heart rate more than 90 beats/min * Respiratory rate more than 20 /min or PaCO2 less than 32 mmHg (4.3 kPa) * White blood cell more than 12,000 cell/mm3 or less than 4,000 cell/mm3 3.2. Patients who was diagnosed sepsis or SOFA score or qSOFA score at least 2 score 3.3. Patients who was diagnosed septic shock or who had hypotension with adequate fluid and need for vasopressor to maintain mean arterial pressure over 65 mmHg and serum lactate above 2 mmol/L 4. Patients who received antibiotics at least 48 hours which are as follow: * Ceftazidime-Avibactam or * Combination antibiotics (eg. Meropenem-Colistin, Imipenem-Colistin, Tigecycline-Amikacin, Tigecycline- Gentamicin, Tigecycline-Meropenem or Tigecycline-Colistin) Exclusion Criteria: 1. Patients who were pregnancy or breastfeeding 2. Patients who had drug allergy (eg. Ceftazidime-Avibactam, Tigecycline, Amikacin, Gentamicin, Imipenem, Meropenem or Colistin) 3. Patients who not to received resuscitation. 4. Patients who were end stage cancer.