Sepsis and Septic Shock

A 58-year-old man with diabetes mellitus presents to the emergency department with fever (39.5°C), hypotension (BP 88/52 mmHg), tachycardia (HR 118/min), and altered mental status. He has a urinary catheter in situ for 3 days. Clinical suspicion for septic shock is high. Which investigation is most appropriate to identify the causative organism and guide antimicrobial therapy?

A 58-year-old man with diabetes mellitus presents to the emergency department with a 2-day history of fever (39.5°C), chills, and productive cough. He reports dysuria and frequency for the past 3 days. On examination, he is tachypneic (RR 28/min), tachycardic (HR 118/min), and hypotensive (BP 88/54 mmHg). Skin is warm and flushed. Laboratory investigations reveal WBC 18,500/μL, lactate 4.2 mmol/L, and creatinine 2.1 mg/dL (baseline 1.0). Urinalysis shows pyuria and bacteriuria. Blood and urine cultures are sent. What is the most appropriate immediate management?

According to the Surviving Sepsis Campaign guidelines (2021), what is the maximum time window for initiation of broad-spectrum antibiotics in a patient with septic shock?

A 38-year-old woman with a history of severe penicillin anaphylaxis presents with septic shock secondary to a urinary tract infection. Blood cultures are pending. Which is the preferred empirical antibiotic regimen in this patient?

A 42-year-old woman with community-acquired pneumonia presents with fever, hypotension, and respiratory distress. She meets criteria for sepsis. Initial investigations show WBC 18,000/μL, CRP 12 mg/dL, and lactate 3.2 mmol/L. Blood culture has been sent. Which additional investigation is most appropriate to assess the adequacy of tissue perfusion and guide fluid resuscitation?