45 year old lady with abdominal pain , fever for 3 days , BP 70/90 , RR 32 , SpO2 94% , given O2 40% venturi mask. Most appropriate next step? A. Broad spectrum antibiotics B. administration of 20% albumin 100 ml C. administer 30ml/kg of N/saline D. noradrenaline infusion 0.05microgram/kg/hr E. vasopressin 0.3/kg/hr
Reading File
Finding Sources
Finding Sources
Reading File
Reading File
The answer is C. Administer 30 mL/kg of Normal Saline.
Clinical Reasoning
Step 1 — Identify the diagnosis
This patient has septic shock:
- Source: intra-abdominal (abdominal pain + fever 3 days → likely peritonitis, cholangitis, or visceral perforation)
- Hemodynamic compromise: BP 70/90 mmHg (hypotension)
- Respiratory distress: RR 32, SpO₂ 94% on 40% O₂
- This meets Sepsis-3 criteria for septic shock: infection + vasopressor-level hypotension + likely tissue hypoperfusion
Step 2 — What is the correct first step?
Per the Surviving Sepsis Campaign (now widely accepted as standard of care), the immediate priority in septic shock is:
"Administration of a balanced crystalloid fluid in the first three hours of recognition — 30 mL/kg — is recommended in all infected patients who demonstrate clinical or laboratory signs suggestive of impaired tissue perfusion (i.e., hypotension or lactate elevation >2 mmol/L)." — Miller's Anesthesia, 10e
"Fluids (30 mL/kg of intravenous crystalloid, either 0.9% saline or a balanced solution such as lactated Ringer solution) should be given over the first 3 hours." — Goldman-Cecil Medicine
This is the most appropriate NEXT step because the patient is not yet confirmed to have failed fluid resuscitation. Vasopressors are only indicated after fluids have been tried and MAP cannot be maintained.
Why the other options are wrong
| Option | Problem |
|---|---|
| A. Broad-spectrum antibiotics | Correct and important — but antibiotics treat the source, not the hemodynamic emergency. Fluids must be given simultaneously/first for the shock. In reality both happen together, but the single most appropriate next step for the shock physiology is fluid. |
| B. 20% albumin 100 mL | Albumin is not first-line. "There are no convincing data indicating that albumin is better than crystalloid solutions" in septic shock (Goldman-Cecil). Colloids are not the initial fluid of choice. |
| D. Noradrenaline 0.05 mcg/kg/min | Vasopressors are the correct first-line vasopressor, but only after adequate fluid resuscitation fails to restore MAP >65 mmHg. Starting vasopressors before fluids is premature. |
| E. Vasopressin 0.3 U/kg/hr | Vasopressin is a second-line vasopressor added to norepinephrine in refractory septic shock. It has no role as an initial agent. The dose given (0.3/kg/hr) also appears incorrect — standard dose is a fixed 0.03–0.04 U/min infusion, not weight-based. |
Key Teaching Point
In septic shock, the 1-hour bundle (Surviving Sepsis Campaign) requires:
- Measure lactate
- Blood cultures → then broad-spectrum antibiotics
- 30 mL/kg IV crystalloid for hypotension or lactate ≥4 mmol/L
- Vasopressors if hypotension persists after fluids
The question asks for the most appropriate NEXT step in isolation — and the correct answer is C, because fluid resuscitation at 30 mL/kg crystalloid is the mandatory first hemodynamic intervention before escalating to vasopressors.
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