Clinical snapshot
70-year-old man with heart failure and diabetes.
BP 86/52, HR 110, RR 28, SpO₂ 92% on 4 L NC, T 38.8°C, lactate 6.1, urine 10 mL/hr.
POCUS: IVC full/non-collapsing, LV small & hyperdynamic, bilateral B-lines, VExUS 3, LVOT VTI 14 cm.
He looks septic (fever, flushed, warm extremities) but he’s also clearly congested and his stroke volume is low.
What’s going on?
| Category | Finding | Meaning |
|---|---|---|
| Vitals | BP 86/52, HR 110 | Hypotension + tachycardia = shock |
| Temp 38.8°C | Likely sepsis | |
| Warm, flushed skin | Low SVR (vasodilation) | |
| Labs | Lactate 6.1 | Global hypoperfusion |
| Output | Urine output 10 mL/hr | Poor organ perfusion |
So far, you might think: distributive shock (sepsis).
But Now Look at the Ultrasound
| Probe | Finding | Interpretation |
|---|---|---|
| IVC | Full, non-collapsing | High preload (congested) |
| LV | Small but hyperdynamic | Still compensating; not in systolic failure yet |
| Lungs | B-lines bilaterally | Pulmonary congestion |
| VExUS | Grade 3 | Severe venous congestion (hepatic/portal/renal backup) |
| LVOT VTI | 14 cm | ↓ Stroke volume → inadequate forward flow |
The Conflict
- Distributive signs: Fever, flushed skin, low BP → likely sepsis → needs pressor
- But also: Full IVC, B-lines, VExUS 3 → too much volume → needs decongestion
- And: Small hyperdynamic LV + low VTI → flow not yet restored
This is distributive + cardiogenic/volume-overloaded mixed shock:
- Sepsis → vasodilation → fluids given early
- Heart failure + too many fluids → venous congestion + falling stroke volume
Immediate bedside plan :
0. Safety & basics
- Keep O₂ to maintain SpO₂ ≥ 94% (optimize position; consider HFNC if dyspneic).
- Two large IVs; monitor, Foley for UO trending; broad-spectrum antibiotics now.
- Labs, blood cultures, lactate trend; start source control pathway.
1. Stop fluids.
Further fluid will worsen VExUS and gas exchange.
2. Restore vascular tone: Start norepinephrine.
- Titrate to MAP ≥ 65–70 (individualize if chronic HTN).
- Recheck LVOT VTI every few minutes; aim for rising VTI and improving mentation/urine output.
3. Decongest once pressure is safe.
- If MAP stabilized and oxygenation limited by edema: start gentle diuresis (e.g., loop diuretic) while watching VExUS, lungs, and BP.
- If diuresis fails or renal function crashes: early ultrafiltration discussion.
4. If flow remains poor (VTI stays <16–18 cm) despite MAP correction:
- Evaluate for septic cardiomyopathy (reduced EF) or dynamic LVOT obstruction (SAM).
- Consider dobutamine (if low EF) only after vasopressor support; avoid in LVOTO.
- If suspected LVOTO: reduce catecholamines, give cautious fluids only if not grossly congested, and consider beta-blockade with expert input.
Focused ultrasound re-scan checklist :
Heart
- LV: EF trend; cavity size. Look for SAM and late-peaking CW Doppler if LVOTO suspected.
- RV: size/function; D-shaped LV? If RV strain, reassess for PE or pressure overload.
- VTI: apical 5-ch (or 3-ch), PW at LVOT. Track response to norepinephrine or diuresis.
IVC & VExUS
- IVC diameter/variability.
- Hepatic, portal, intrarenal Doppler → confirm/grade congestion (VExUS 3 = severe). Expect improvement with decongestion.
Lungs
- Hydrostatic edema: diffuse B-lines, smooth/regular pleura, gravity-dependent.
- Inflammatory/ARDS/pneumonia: irregular/thick pleura, spared areas, subpleural consolidations.
This distinction matters: inflammatory B-lines don’t mandate diuresis; hydrostatic ones usually do.
How I’d sequence care :
- Antibiotics and cultures immediately.
- Stop fluids; place norepinephrine, target MAP ≥ 65.
- Re-check VTI after NE uptitration:
- If VTI rises and mentation/UO improve → continue NE, begin gentle diuresis; recheck VExUS and lungs.
- If VTI flat/low and LV looks weak → consider dobutamine (with arterial line and close echo).
- If hyperdynamic tiny LV with late-peaking LVOT jet → think LVOTO; limit inotropes, consider cautious beta-blockade; avoid aggressive diuresis until sure.
- Oxygenation: escalate to HFNC or NIV if needed; intubation only if tiring/worsening (positive pressure may worsen venous congestion—watch carefully).
- Daily loop: VExUS grade, lung profile, VTI, lactate, UO, mental status = your compass.
Pearls & pitfalls
Pearls
- VExUS + VTI together separates “wet and failing forward” from “dry and distributive.”
- A small, fast LV in septic vasodilation can trick you into giving fluids—don’t if VExUS is high.
- B-lines ≠ always fluid. Use pleural line and distribution to separate edema from ARDS/pneumonia.
- Rising VTI after starting NE is a good sign you’re restoring effective forward flow.
Pitfalls
- Continuing a fluid trial because the LV “looks empty.” The IVC/VExUS says otherwise.
- Starting inotrope before afterload is fixed → can precipitate LVOTO or worsen tachycardia.
- Over-diuresis while MAP is fragile → flow collapses; watch VTI and perfusion markers.
Suspect mixed shock if: warm, hypotensive + VExUS 3 / B-lines / low VTI.
Do:
- NE for tone → MAP ≥ 65.
- Stop fluids.
- Reassess VTI (goal trend up).
- Start gentle diuresis once MAP holds and lungs are wet.
- If low EF → consider dobutamine (after NE).
- If LVOTO → reduce catecholamines, consider beta-blocker, avoid aggressive diuresis until stable.
- Antibiotics + source control on time, every time.
Track: VExUS grade, lung profile, VTI, lactate, UO, mental status.
Take-home messages :
- This is sepsis with congestion: treat vasodilation and venous excess at the same time.
- Fluids hurt here. Raise tone with norepinephrine, then decongest while monitoring VExUS, lungs, and VTI.
- Use ultrasound to personalize resuscitation. Numbers guide us; the patient’s physiology decides.
