Capillary refill and lactate sharpen risk in refractory septic shock

Design

Exploratory secondary analysis of a randomised trial

Population

1,363 adults with early septic shock

Primary outcome

28-day mortality

Effect

74% vs 24% mortality; adjusted HR 4.68 (3.31–6.64)

This exploratory secondary analysis of the ANDROMEDA-SHOCK-2 trial looked at 1,363 patients with early septic shock six hours after protocolised resuscitation. Investigators asked whether adding signs of persistent hypoperfusion to a high vasopressor dose (noradrenaline equivalent above 0.5 µg/kg/min) better identified patients at risk of death.

A high dose alone flagged 188 patients (13.8%) with 48% mortality. Adding both an abnormal capillary refill time above 3 seconds and a non-falling lactate identified 53 patients (3.9%) with 74% mortality, against 24% in everyone else (adjusted HR 4.68, 95% CI 3.31–6.64). Its positive likelihood ratio for death was 8.1 against 2.7 for dose alone. Requiring either sign identified 124 patients with 55% mortality.

This is hypothesis-generating and does not test any treatment. But capillary refill and serial lactate are cheap and available everywhere, including Indian emergency departments and wards without advanced monitoring. They help decide who needs escalation, senior review or a frank discussion of prognosis.

• Reassess capillary refill time and lactate after six hours of septic shock resuscitation, not only vasopressor dose.
• Treat high vasopressor dose with abnormal refill and non-falling lactate as a very high-risk state warranting senior review.
• Use this combination to prioritise escalation and family discussion, not to withhold treatment.
• Measure capillary refill in a standard way so serial values are comparable.

Why it matters

Vasopressor dose alone overcalls refractory shock; adding bedside perfusion signs narrows it to those truly in danger.

Don't overread it

An exploratory analysis of a trial; it identifies risk, not a treatment that changes it.

The statistics, in plain English

A positive likelihood ratio of 8 means meeting the criteria makes death substantially more likely than before testing; a ratio of 2.7 for dose alone shifts the odds far less.

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