Septic Shock and Multi‑Organ Dysfunction: Evidence‑Based Recommendations

Diagnostic Criteria for Septic Shock

Persistent hypotension requiring vasopressors to maintain MAP ≥ 65 mmHg and a serum lactate > 2 mmol/L after adequate fluid resuscitation defines septic shock. 1

Altered mental status is a cardinal sign of severe sepsis/septic shock, reflecting cerebral hypoperfusion and organ dysfunction. 1
Hyponatremia and hypokalemia frequently accompany sepsis due to SIADH, cerebral salt‑wasting, gastrointestinal losses, and renal dysfunction. 2

Continuous vital‑sign monitoring (blood pressure, heart rate, respiratory rate, oxygen saturation, temperature) is essential in the first 30 minutes of suspected septic shock. 1
Systematic volume‑status evaluation (skin turgor, mucous membranes, jugular venous pressure, capillary refill, urine output) guides fluid‑resuscitation decisions. 3
A focused neurologic exam—including Glasgow Coma Scale, assessment for focal deficits, and detection of asterixis—helps identify encephalopathy and differentiate hepatic from septic causes. 4
Prompt identification of infection source (e.g., pneumonia, urinary‑tract infection, intra‑abdominal, skin/soft‑tissue) directs targeted therapy. 1

A comprehensive metabolic panel should be obtained to quantify electrolyte disturbances and assess renal function. 2
Blood cultures, urinalysis, and chest radiography are indicated when infection is suspected to isolate the causative pathogen. 1
Liver function tests and coagulation studies are warranted in patients with known or suspected chronic liver disease. 4

Early empiric broad‑spectrum antibiotics should be administered as soon as infection is suspected in septic patients. 2
Vasopressor support should be initiated without delay when MAP cannot be maintained ≥ 65 mmHg despite fluid resuscitation. 1
In patients with cirrhosis, a lactulose trial is recommended when hepatic encephalopathy is considered. 2

Cardiogenic shock typically presents with pulmonary edema and specific cardiac symptoms, distinguishing it from septic shock. 5
An electrocardiogram should be performed to detect ischemic changes or arrhythmias that may arise from electrolyte abnormalities. 5

In patients with known cirrhosis, ACLF should be considered; altered mental status is the hallmark presentation. 4
Electrolyte abnormalities, particularly hyponatremia and hypokalemia, are common precipitants of hepatic encephalopathy. 2
Elevated lactate may signal hepatic dysfunction and impaired synthetic capacity in ACLF. 4
Troponin elevation can occur secondary to cirrhotic cardiomyopathy in ACLF. 4
Key distinguishing features of ACLF include a history of chronic liver disease, physical findings such as asterixis, jaundice, and ascites, and often an elevated ammonia level. 4

Brain CT or MRI is indicated for a first episode of altered mental status, focal neurologic signs, seizures, or lack of response to initial therapy. 6
Chest imaging should be obtained when pulmonary infection or pulmonary edema is suspected. 1

The Society of Critical Care Medicine defines septic shock as a subset of sepsis with profound circulatory, cellular, and metabolic abnormalities characterized by vasopressor requirement to maintain mean arterial pressure ≥65 mmHg and serum lactate level >2 mmol/L (>18 mg/dL) in the absence of hypovolemia 7, 8
Septic shock can be clinically identified by persistent hypotension requiring vasopressors to maintain mean arterial pressure ≥65 mmHg and elevated serum lactate >2 mmol/L (>18 mg/dL) despite adequate volume resuscitation 7, 8

Septic shock involves profound circulatory dysfunction characterized by vasodilation and increased vascular permeability 8
Microcirculatory dysfunction leads to tissue hypoperfusion in septic shock 8
Cellular and metabolic abnormalities include altered cellular metabolism leading to lactate accumulation 8

Early recognition of septic shock is crucial for improving outcomes, with management priorities including early initiation of vasopressors (norepinephrine as first-line) 8
Targeting a mean arterial pressure of 65-70 mmHg is recommended in the management of septic shock 8
Avoiding fluid overload is important as it may worsen outcomes in septic shock 8
Failing to recognize perfusion abnormalities despite normal blood pressure in patients receiving vasopressors is a common pitfall in identifying septic shock 8
Delaying vasopressor initiation while continuing excessive fluid administration is another common pitfall 8
Not measuring lactate levels, which are essential for the diagnosis according to current definitions, is a significant oversight 7
Confusing septic shock with other forms of distributive shock can lead to inappropriate management 9