Low cardiac output after septic shock resuscitation — FFICM MCQ

Correct answer: A — Bedside echocardiography to assess ventricular function and volume status

The correct answer is A, bedside echocardiography to assess ventricular function and volume status. This patient has ongoing tissue hypoperfusion despite an adequate MAP and initial fluids, shown by persistent lactataemia (5.9 mmol/L), prolonged capillary refill, mottling and a low ScvO2 (52%), all indicating inadequate oxygen delivery relative to demand. Before escalating vasopressor or inotrope therapy, current sepsis guidance recommends re-evaluating haemodynamics with a focused, repeatable, bedside tool rather than empirical drug titration. Echocardiography rapidly differentiates septic cardiomyopathy, hypovolaemia, right ventricular strain and gross valvular or pericardial pathology, directly informing whether the next step should be fluid, inotrope, or vasopressor adjustment. This aligns with Surviving Sepsis Campaign guidance that ongoing fluid and haemodynamic therapy should be guided by dynamic, repeated assessment rather than physical examination or static parameters alone. Why the other options are wrong: C. Routine CT pulmonary angiography as first test: there is no clinical suspicion of pulmonary embolism described, and moving an unstable ventilated patient to CT before optimising haemodynamics at the bedside is unsafe and does not address the immediate perfusion problem. D. Daily chest radiography as the sole assessment: a static, infrequent imaging modality gives no real-time information on cardiac function, filling status or fluid responsiveness and cannot guide acute haemodynamic decisions. B. Serum troponin as the sole haemodynamic assessment: troponin may be elevated due to critical illness or septic myocardial injury but is a biomarker of myocardial damage, not a functional or volumetric assessment, and cannot direct fluid versus inotrope decisions. E. Pulmonary artery catheter insertion before echo: this is invasive, time consuming and carries procedural risk; echocardiography is the recommended first line, noninvasive step before considering more invasive monitoring. Key point: In septic shock with persistent hypoperfusion despite adequate MAP, bedside echocardiography is the first line reassessment tool to guide further fluid, inotrope or vasopressor therapy.

Reference: Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021 (Evans et al., Critical Care Medicine 2021), section on haemodynamic monitoring and dynamic assessment; https://pmc.ncbi.nlm.nih.gov/articles/PMC8486643/