Catecholamine-Sparing Strategies in Septic Shock
Catecholamine-Sparing
Strategies in Septic Shock
Source and Scope
- Primary source: Dubech A, Picod A, Pierre A, Preau S, Favory R,
Garcia B. Current and Future Strategies Aiming at Reducing Catecholamine
Exposure in Septic Shock. Critical Care. 2026;30:427.[1]
- The source is a narrative review, not a treatment guideline or a
systematic review.
- The review integrates physiology, randomized trials, observational
studies, post hoc analyses, preclinical work, and emerging
biomarker-guided strategies. These evidence types should not be treated
as equivalent.
- Current bedside recommendations in these notes are reconciled with
the 2026 Surviving Sepsis Campaign (SSC) adult guideline.[2,3]
- Disclosure context: the corresponding author reported honoraria for
presentations and meetings related to DPP3, angiotensin II, and
vasopressin outside this work. Emerging interventions should be
interpreted with the same evidentiary caution applied to all narrative
reviews.
Core Clinical Takeaway
- Norepinephrine remains the first-line vasopressor for septic shock
because it restores perfusion pressure rapidly and has a more favorable
safety profile than dopamine or epinephrine.
- Catecholamine sparing does not mean withholding norepinephrine from
a hypotensive, hypoperfused patient.
- The practical goal is to:
- Start norepinephrine early when vasoplegia persists.
- Avoid prolonged severe hypotension.
- Use the lowest dose that achieves an individualized perfusion
goal.
- Stop unnecessary fluid loading.
- Reassess cardiac function, venous congestion, fluid responsiveness,
and tissue perfusion.
- Add nonadrenergic or adjunctive treatment when supported by the
clinical phenotype and evidence.
- Higher norepinephrine doses are strongly associated with higher
mortality, but this relationship is confounded by shock severity. It
does not prove that norepinephrine itself is the cause of death.
- Many proposed catecholamine-sparing interventions shorten
vasopressor exposure without demonstrating a survival benefit. A
reduction in dose or duration is not automatically a patient-centered
benefit.
Why Norepinephrine Remains
Central
Arterial Tone and
Perfusion Pressure
- Septic shock is characterized by profound vasodilation and loss of
arterial vascular tone.
- Norepinephrine activates alpha-1 adrenergic receptors and produces
dose-dependent increases in systemic vascular resistance and mean
arterial pressure (MAP).
- Systemic vascular resistance is a derived global variable. It does
not fully describe regional or microcirculatory flow.
- The major pressure drop in the circulation occurs across small
arteries and arterioles, not uniformly across the entire vascular
system.
The Vascular Waterfall
Concept
- Critical closing pressure (Pcrit) is the arterial pressure below
which a vessel collapses and flow stops, even if a nominal pressure
gradient remains.
- Tissue perfusion pressure can be conceptualized as the gradient
between arterial pressure and Pcrit.
- Microcirculatory flow also depends on the vascular waterfall
gradient between Pcrit and mean systemic filling pressure (Pmsf).
- In septic vasoplegia:
- Pcrit may fall toward Pmsf.
- The vascular waterfall gradient narrows or disappears.
- Cardiac output may remain normal or high while tissue perfusion
remains inadequate.
- Norepinephrine can restore effective flow when it raises Pcrit above
Pmsf and raises arterial pressure above the new Pcrit.
- Venous congestion raises Pmsf and can compress the Pcrit-to-Pmsf
gradient. A normal MAP therefore does not guarantee adequate tissue
perfusion.
- Bedside implication: reassess venous congestion, cardiac function,
capillary refill, skin perfusion, urine output, mental status, and
lactate kinetics rather than treating MAP as the only target.
Venous Return and Preload
- Alpha-mediated venoconstriction increases stressed venous volume and
Pmsf.
- In preload-responsive patients, this may increase venous return and
cardiac output.
- In a physiologic study of 25 preload-responsive patients with septic
shock and diastolic arterial pressure of 40 mm Hg or lower, increasing
norepinephrine raised preload indices and reduced the cardiac index
response to a repeat passive leg raise from 19% to 13%.[1]
- Norepinephrine may therefore recruit preload reserve, but this does
not replace direct assessment of fluid responsiveness.
Inotropic Effect
- Norepinephrine also stimulates beta-1 receptors.
- In 38 patients with early septic shock and MAP below 65 mm Hg,
norepinephrine increased MAP from 56 to 80 mm Hg while left ventricular
ejection fraction and Doppler systolic velocities increased.[1]
- This supports a clinically relevant inotropic effect during early
shock despite the simultaneous increase in afterload.
- A fall in ejection fraction after restoring vascular tone may unmask
previously hidden septic myocardial dysfunction rather than prove that
norepinephrine newly injured the heart.
Macro-Microcirculatory
Uncoupling
- Septic shock reduces functional capillary density and increases
heterogeneity of microvascular flow.
- These abnormalities may persist after MAP and cardiac output
normalize.
- Raising MAP from a critically low level can recruit
pressure-dependent microvascular beds.
- Beyond that range, the microcirculatory response is heterogeneous
because norepinephrine simultaneously restores perfusion pressure and
constricts alpha-1 receptor-bearing arterioles.
- This loss of coherence between the macrocirculation and
microcirculation explains why a higher MAP does not reliably improve
lactate, mottling, or organ function.
Comparative Vasopressor
Evidence
Dopamine
- SOAP II found no significant difference in 28-day mortality between
dopamine and norepinephrine in patients with shock.
- Arrhythmias were substantially more frequent with dopamine: 24.1%
versus 12.4%.
- This safety difference is a major reason dopamine no longer has a
routine role in septic shock.
Epinephrine
- Epinephrine can achieve MAP targets but causes more tachyarrhythmia
and beta-2 mediated lactate production.
- CAT and CATS did not demonstrate superior clinical outcomes with
epinephrine-based treatment.
- An epinephrine-associated lactate increase may be pharmacologic
rather than a direct marker of worsening tissue hypoxia, but it
complicates interpretation of resuscitation.
- SSC 2026 suggests adding epinephrine when MAP remains inadequate
despite norepinephrine and vasopressin, or when vasopressin is
unavailable.[2,3]
Norepinephrine
Shortage as a Natural Experiment
- During the 2011 United States norepinephrine shortage, substitution
with other agents, mainly phenylephrine, was associated with a 3.7%
absolute increase in hospital mortality.
- This was an observational natural experiment, not a randomized
comparison, but it reinforces the clinical importance of ready access to
norepinephrine.
Start Earlier to Use Less
CENSER
- CENSER randomized patients with sepsis and MAP below 65 mm Hg to
early low-dose norepinephrine plus fluids or usual care with
vasopressors after at least 30 mL/kg of crystalloid.[4]
- Shock control at 6 hours occurred in 76% of the early norepinephrine
group and 48% of the usual-care group.
- Cardiogenic pulmonary edema occurred in 14.4% versus 27.7%.
- New-onset arrhythmia occurred in 11% versus 20%.
- Twenty-eight-day mortality did not differ significantly: 15.5%
versus 21.9%.
- Interpretation: early norepinephrine improved early shock control
and reduced complications, but CENSER did not establish a mortality
benefit.
CLOVERS
- CLOVERS randomized 1,563 patients with sepsis-induced hypotension
after at least 1 L of crystalloid to a restrictive fluid,
vasopressor-prioritized strategy or a liberal fluid strategy.[5]
- Ninety-day mortality was 14.0% versus 14.9%, with no significant
difference.
- The restrictive group received a median 2,134 mL less intravenous
fluid during the protocol period.
- CLOVERS did not directly randomize immediate versus delayed
norepinephrine. It supports the safety of a vasopressor-prioritized,
fluid-restrictive strategy after initial fluid administration.
- A post hoc subgroup with advanced chronic kidney disease had lower
90-day death before discharge home with the restrictive strategy, but
this exploratory result is not definitive and should not be generalized
to all patients with kidney disease.
Bedside Markers of
Vasoplegia
- A low diastolic arterial pressure may indicate loss of arterial
tone.
- The diastolic shock index is heart rate divided by diastolic
arterial pressure.
- A high diastolic shock index in a tachycardic patient may identify a
vasoplegic phenotype likely to need early vasopressor support.
- These markers supplement, rather than replace, assessment of
infection, preload, cardiac function, obstruction, and tissue
perfusion.
Peripheral Norepinephrine
- SSC 2026 suggests starting vasopressors through a peripheral
intravenous catheter rather than delaying therapy until central access
is secured. Certainty of evidence is very low.[2,3]
- A protocolized prospective cohort of 635 patients used peripheral
norepinephrine for a median of 5.8 hours and avoided central venous
catheter placement for vasopressor delivery in 51.6% of
patients.[1]
- The cohort used a strict protocol and a maximum norepinephrine dose
of 15 micrograms/min. Extravasation occurred, but no patient developed
tissue necrosis or required surgery.
- In a CLOVERS secondary analysis, peripheral vasopressors were
common, with 3 peripheral infusion complications among 490 patients and
no tissue necrosis. Central catheter complications occurred in 12 of 322
patients.[6]
- The 15 micrograms/min ceiling from one protocol should not be
treated as a universal safety threshold.
- The SSC states that evidence is insufficient to define an optimal
catheter size, anatomic site, dose limit, or duration.
- Safe use requires an institutional protocol that addresses:
- A well-functioning peripheral line.
- Frequent site assessment.
- A dedicated infusion line when possible.
- Prompt recognition of pain, swelling, blanching, leakage, or loss of
blood return.
- Immediate extravasation management.
- Transition to central access when dose, duration, access quality, or
the overall resuscitation plan makes it appropriate.
The Burden of
Sustained Adrenergic Exposure
Cardiac Effects
- Early norepinephrine can improve preload, contractility, and
perfusion pressure.
- Prolonged or high-dose adrenergic stimulation increases myocardial
oxygen demand and wall stress.
- Catecholamine-associated myocardial injury is biologically
plausible, with histologic, animal, biomarker, and Takotsubo-like
evidence.
- Direct human evidence that norepinephrine independently causes
clinically important myocardial injury remains limited.
- Sepsis-induced cardiomyopathy, altered loading conditions, ischemia,
inflammation, and treatment exposure often coexist.
Arrhythmias
- Beta-1 stimulation contributes to atrial and ventricular
arrhythmias.
- New-onset atrial fibrillation becomes more common as sepsis severity
increases and is associated with longer ICU stay and higher
mortality.
- A meta-analysis of vasopressin plus catecholamines versus
catecholamines alone found a lower atrial fibrillation risk with
vasopressin (relative risk 0.77) but no clear survival benefit.
- SEPSISPAM found more atrial fibrillation with a MAP target of 80 to
85 mm Hg than with 65 to 70 mm Hg: 6.7% versus 2.8%.
- Catecholamines increase glycogenolysis, gluconeogenesis, lipolysis,
insulin resistance, and substrate turnover.
- Beta-adrenergic stimulation can increase aerobic glycolysis and
lactate production without tissue hypoxia, particularly with
epinephrine.
- Severe acidosis can reduce myocardial contractility and vasopressor
responsiveness.
- Observational data associate vasopressor exposure with ICU-acquired
weakness, but residual confounding by severity, immobility,
inflammation, corticosteroids, and mechanical ventilation is
likely.
Immune Effects
- Catecholamines can suppress tumor necrosis factor-alpha,
interleukin-1 beta, and interleukin-6 while increasing interleukin-10
through beta-2 signaling.
- Experimental studies also suggest impaired neutrophil and macrophage
phagocytosis, reduced oxidative burst, altered lymphocyte function, and
enhanced bacterial growth or virulence.
- Most mechanistic immune evidence is in vitro or preclinical.
- Higher catecholamine exposure is associated with immunoparalysis,
secondary infection, and mortality, but clinical causality remains
unproven.
Strategy 1:
Do Not Chase an Unnecessarily High MAP
Standard Initial Target
- SSC 2026 recommends an initial MAP target of 65 mm Hg rather than a
higher target. This is a strong recommendation with moderate-certainty
evidence.[2,3]
- For adults 65 years or older, SSC 2026 suggests an initial MAP range
of 60 to 65 mm Hg rather than a higher range. This is a conditional
recommendation with low-certainty evidence.
- The target should be treated as a range, not an exact single
number.
- MAP should be individualized after considering tissue perfusion,
chronic hypertension, neurologic disease, renal perfusion, arterial
measurement reliability, and adverse effects of vasopressor
escalation.
Evidence Against Routine
High Targets
- SEPSISPAM found no mortality benefit from targeting 80 to 85 mm Hg
instead of 65 to 70 mm Hg.
- A chronic-hypertension subgroup required less renal replacement
therapy at the higher target, but this did not establish a universal
survival benefit.
- OPTPRESS randomized 518 patients 65 years or older with septic shock
in Japan to MAP 80 to 85 mm Hg or 65 to 70 mm Hg.[7]
- The trial stopped early for a signal of harm.
- Ninety-day mortality was 39.3% with the high target and 28.6% with
the standard target, an absolute risk difference of 10.7%.
- The standard-target group also had more catecholamine-free
days.
- The mechanism of harm remains uncertain because arrhythmias were not
significantly increased.
Lower Targets
- Lower MAP targets may reduce vasopressor exposure in selected
patients without active signs of tissue hypoperfusion.
- This does not mean that persistent MAP below 60 mm Hg is routinely
safe.
- The risk from hypotension depends on depth, duration, baseline
pressure, autoregulation, and organ-specific vulnerability.
- If a higher MAP is considered for chronic hypertension, a
time-limited MAP test with simultaneous reassessment of capillary
refill, urine output, cognition, lactate, cardiac function, and adverse
effects is more defensible than automatically maintaining a high
target.
Strategy
2: Resuscitate Perfusion, Not the Monitor Alone
ANDROMEDA-SHOCK
- ANDROMEDA-SHOCK randomized 424 patients to capillary refill time
(CRT)-guided or lactate-targeted resuscitation after initial MAP
stabilization.[8]
- Twenty-eight-day mortality was 34.9% versus 43.4%, but the
difference did not reach conventional statistical significance.
- CRT-guided treatment used 408 mL less fluid during the first 8 hours
and produced a 1-point lower Sequential Organ Failure Assessment score
at 72 hours.
- A Bayesian reanalysis suggested a high probability of benefit, but
it remained exploratory.
ANDROMEDA-SHOCK-2
- ANDROMEDA-SHOCK-2 randomized 1,501 patients with early septic shock,
with 1,467 included in the primary analysis across 86 ICUs in 19
countries.[9]
- The intervention used CRT as the perfusion target and integrated
pulse pressure, diastolic arterial pressure, fluid responsiveness, and
bedside echocardiography to guide fluids, vasopressors, and
inotropes.
- The hierarchical composite of mortality, duration of vital support,
and hospital stay favored personalized resuscitation (win ratio 1.16;
95% confidence interval 1.02 to 1.33).
- The benefit was driven mainly by shorter duration of vital support,
not mortality.
- Ninety-day mortality did not differ significantly: 32.1% versus
33.2%.
- Vasopressor support was approximately 0.95 day shorter with the
personalized strategy.
- Interpretation: CRT-centered personalized resuscitation can reduce
treatment intensity and organ-support duration, but it has not
demonstrated a survival advantage.
Practical Perfusion
Reassessment
- After achieving a minimum perfusion pressure, reassess:
- CRT and mottling.
- Mental status.
- Urine output and renal trajectory.
- Lactate trend and plausible nonhypoxic causes of
hyperlactatemia.
- Pulse pressure and diastolic arterial pressure.
- Fluid responsiveness before additional boluses.
- Left and right ventricular function.
- Venous congestion.
- SSC 2026 suggests using CRT as an adjunct to other perfusion
measures, not as a stand-alone target.
Strategy
3: Add Vasopressin to an Escalating Norepinephrine Requirement
Rationale and Evidence
- Relative vasopressin deficiency occurs in a subset of patients with
septic shock.
- Vasopressin restores vascular tone through a nonadrenergic pathway
and can reduce norepinephrine exposure.
- VASST did not improve its primary mortality outcome
overall.[10]
- A prespecified subgroup receiving less than 15 micrograms/min of
norepinephrine at randomization had a possible survival benefit, but
subgroup results do not prove that earlier vasopressin improves
survival.
- VANISH and VANCS II did not establish a mortality benefit. VANISH
suggested less renal replacement therapy.
- Vasopressin-containing strategies reduce atrial fibrillation
compared with catecholamines alone, but a mortality benefit remains
uncertain.
2026 SSC Position
- SSC 2026 conditionally suggests adding vasopressin when
norepinephrine doses are escalating, with moderate-certainty
evidence.[2,3]
- The review describes a common approach of fixed-dose vasopressin at
0.03 units/min when norepinephrine approaches 0.25
micrograms/kg/min.[1]
- The publicly listed SSC recommendation does not establish 0.25
micrograms/kg/min as a mandatory threshold. Timing should follow the
trajectory of shock, local protocols, and the patient's hemodynamic
phenotype.
- Vasopressin is usually administered at a fixed low dose rather than
titrated as the primary vasopressor.
Phenotype and Cautions
- Vasopressin may be particularly attractive in marked vasoplegia,
preserved cardiac output, escalating norepinephrine exposure, or
tachyarrhythmia.
- The hypothesis that patients with left ventricular systolic
dysfunction may respond less favorably comes from physiologic reasoning
and post hoc data. Left ventricular dysfunction is not an established
absolute contraindication.
- Monitor for excessive vasoconstriction, digital or mesenteric
ischemia, reduced cardiac output, and hyponatremia.
- A reinforcement-learning analysis associated closer agreement with
model-recommended vasopressin timing with lower mortality. This was
observational model-concordance evidence and requires prospective
validation before clinical use.
Strategy
4: Angiotensin II and the Renin-Angiotensin System
Rationale
- Some patients with vasodilatory shock have low angiotensinogen, high
renin, reduced angiotensin-converting enzyme activity, increased
angiotensin II degradation, or impaired angiotensin II receptor
signaling.
- This creates a plausible phenotype of functional angiotensin II
deficiency.
ATHOS-3
- ATHOS-3 showed that angiotensin II increased MAP at 3 hours and
reduced norepinephrine-equivalent dose in catecholamine-resistant
vasodilatory shock.[11]
- Post hoc analyses suggested possible benefit in patients with acute
kidney injury requiring renal replacement therapy and in patients with
high baseline renin.
- These analyses are hypothesis-generating and have not prospectively
validated renin-guided or kidney phenotype-guided treatment.
2026 SSC Position
- SSC 2026 suggests norepinephrine rather than angiotensin II as the
first-line vasopressor.
- Angiotensin II is not part of the standard SSC escalation sequence,
which moves from norepinephrine to vasopressin and then epinephrine when
MAP remains inadequate.
- Angiotensin II may be considered as a rescue option in selected
catecholamine-resistant vasodilatory shock according to availability,
regulatory status, thrombosis risk, local expertise, and patient
phenotype.
DPP3: Biomarker and
Experimental Target
- Circulating dipeptidyl peptidase 3 (cDPP3) is released during
cellular injury and degrades angiotensin peptides.
- In a multinational cohort of 585 patients with severe sepsis or
septic shock, higher cDPP3 was associated with acute kidney injury,
renal replacement therapy, and higher 28-day and 90-day mortality.
- Association does not establish that cDPP3 is the cause of organ
failure.
- Procizumab, also called invobenitug, is a humanized monoclonal
antibody that inhibits cDPP3.
- In a porcine septic shock model, cDPP3 inhibition reduced
catecholamine requirements and improved fluid balance.
- A small human pilot study of STC3141 in 26 critically ill patients
with sepsis provided early safety, tolerability, and pharmacokinetic
information for histone neutralization, not efficacy evidence for cDPP3
inhibition. Human efficacy data for cDPP3 inhibition remain
pending.
- SSC 2026 does not address cDPP3 inhibition.
Strategy 5: Corticosteroids
- Corticosteroids improve vascular responsiveness and generally
accelerate shock reversal.
- APROCCHSS randomized 1,241 patients with septic shock to
hydrocortisone plus fludrocortisone or placebo.[12]
- Ninety-day mortality was 43.0% versus 49.1% (relative risk
0.88).
- Vasopressor-free days through day 28 were 17 versus 15.
- Other major trials, including ADRENAL, did not demonstrate the same
mortality effect with hydrocortisone alone but did show faster
resolution of shock.
- The survival effect therefore should not be generalized across all
steroid regimens and shock severities.
- SSC 2026 conditionally suggests intravenous corticosteroids for
septic shock, with low-certainty evidence.
- Steroids should be viewed as an evidence-supported adjunct for
ongoing vasopressor-dependent shock, not as a replacement for
antibiotics, source control, fluids when indicated, or
vasopressors.
Strategy 6:
Short-Acting Beta-1 Blockade
Why It Was Studied
- Persistent adrenergic tachycardia increases myocardial oxygen demand
and may impair diastolic filling and ventricular-arterial
efficiency.
- Esmolol and landiolol can reduce heart rate quickly and can be
stopped rapidly if hemodynamics deteriorate.
Conflicting Trial Results
- A single-center trial of 154 patients found lower norepinephrine
requirements and lower 28-day mortality with esmolol, but the control
mortality of 80.5% and unusually large fluid volumes limit
generalizability.
- STRESS-L enrolled patients with established septic shock,
tachycardia, and norepinephrine of at least 0.1 micrograms/kg/min for
more than 24 hours.
- The trial stopped early for a possible harm signal. Landiolol did
not improve the mean 14-day Sequential Organ Failure Assessment score,
and 28-day mortality was numerically higher.
- LANDI-SEP improved a hemodynamic composite of heart-rate control
without increased vasopressor support, but it did not reduce 28-day
mortality.
- A post hoc analysis suggested different responses in sinus
tachycardia and atrial fibrillation. This finding is exploratory and
should not be used as proof that landiolol benefits atrial fibrillation
or harms every patient with sinus tachycardia.
- Meta-analyses remain inconsistent and have low to moderate
certainty.
Clinical Position
- SSC 2026 suggests against using beta-blockers as treatment for
septic shock. This is a conditional recommendation with
very-low-certainty evidence.[2,3]
- Routine beta-blockade for septic sinus tachycardia is not
recommended.
- Before considering heart-rate reduction, correct pain, agitation,
fever, hypovolemia, hypoxemia, anemia, withdrawal, and excessive
beta-agonist exposure, and confirm adequate cardiac output and
perfusion.
- Use outside a trial or specialized protocol requires extreme caution
and real-time hemodynamic monitoring.
Strategy 7: Methylene Blue
- Excess nitric oxide activates soluble guanylate cyclase and cyclic
guanosine monophosphate, contributing to vasoplegia.
- Earlier nonselective nitric oxide synthase inhibition with L-NMMA
increased mortality, demonstrating that broad suppression of nitric
oxide can be harmful.
- A single-center randomized trial of 91 patients tested methylene
blue 100 mg in 500 mL saline over 6 hours daily for 3 days.[13]
- Time to vasopressor discontinuation was 69 hours versus 94
hours.
- Cumulative fluid balance and ICU length of stay were lower.
- Mortality was 33% versus 46%, but the difference was not
significant.
- The trial was small and single center, and green urine could have
compromised blinding.
- SSC 2026 concludes that evidence is insufficient to recommend
intravenous methylene blue for refractory septic shock.
- Clinically important risks include serotonin toxicity with
serotonergic drugs, hemolysis in glucose-6-phosphate dehydrogenase
deficiency, pulse oximetry interference, and dose-related vascular
effects. Safety cannot be inferred from the absence of major events in
one small trial.
Emerging
Immunomodulation and Blood Purification
- Extracellular histones released during cellular injury or NETosis
can promote inflammation, endothelial injury, coagulation, and organ
dysfunction.
- The histone-neutralizing compound mCBS reduced vasopressor
requirement, lactate, interleukin-6, and kidney injury in a sheep
model.
- STC3141 was evaluated in a 26-patient human pilot study for safety,
tolerability, and pharmacokinetics.
- These findings establish feasibility, not clinical efficacy.
- SSC 2026 does not address extracellular histone neutralization.
Polymyxin B Hemoperfusion
- Unselected randomized trials of polymyxin B hemoperfusion did not
improve survival or organ failure.
- A post hoc EUPHRATES analysis restricted to endotoxin activity assay
values of 0.60 to 0.89 suggested lower mortality. Because it was post
hoc, the result is vulnerable to subgroup-selection bias.
- TIGRIS prospectively enrolled 157 patients with septic shock and
endotoxin activity assay values of 0.60 to 0.89.[14]
- Twenty-eight-day mortality was 39% with polymyxin B hemoperfusion
and 45% with control.
- The Bayesian posterior probability of benefit was 95.3%, but the 95%
credible interval for the adjusted odds ratio crossed 1.
- MAP, vasopressor dose, and vasopressor duration did not differ
significantly.
- TIGRIS therefore generated an efficacy signal in a
biomarker-selected population but did not demonstrate catecholamine
sparing.
- SSC 2026 suggests against blood purification techniques and
specifically suggests against polymyxin B hemoperfusion.
2026 SSC: Practical Summary
- Initial MAP:
- Target approximately 65 mm Hg rather than a higher MAP.
- For adults 65 years or older, consider an initial range of 60 to 65
mm Hg.
- Perfusion:
- Use serial lactate in context.
- Use CRT as an adjunct to other perfusion measures.
- Use dynamic measures to guide additional fluid.
- Vasopressor access:
- Start peripherally rather than delaying for central access when
immediate support is needed.
- Vasopressor sequence:
- Norepinephrine first.
- Add vasopressin when norepinephrine is escalating.
- Add epinephrine if MAP remains inadequate despite norepinephrine and
vasopressin.
- Adjuncts:
- Intravenous corticosteroids are conditionally suggested.
- Beta-blockers are conditionally discouraged as treatment for septic
shock.
- Evidence is insufficient for intravenous methylene blue.
- Blood purification and polymyxin B hemoperfusion are
discouraged.
- Angiotensin II is not preferred as first-line treatment and is not
in the standard escalation sequence.
- cDPP3 inhibition and extracellular histone neutralization remain
investigational.
Bedside
Catecholamine-Sparing Checklist
First Hour
- Recognize septic shock and begin infection treatment, source-control
planning, and hemodynamic resuscitation immediately.
- Evaluate whether hypotension reflects vasoplegia, hypovolemia,
myocardial dysfunction, obstruction, or a mixed state.
- Start norepinephrine promptly for persistent hypotension or severe
vasoplegia, including through a monitored peripheral line when
appropriate.
- Use fluid responsiveness rather than a fixed-volume reflex to guide
additional boluses after initial resuscitation.
- Set an initial MAP target near 65 mm Hg, or 60 to 65 mm Hg in many
adults 65 years or older, unless a clear patient-specific reason
supports another target.
During Escalation
- Confirm that the blood pressure measurement is reliable.
- Reassess CRT, skin temperature, mottling, urine output, mental
status, lactate trajectory, and acid-base status.
- Perform bedside echocardiography to assess left ventricular, right
ventricular, valvular, and pericardial causes of persistent shock.
- Check for venous congestion and fluid intolerance.
- Add vasopressin when norepinephrine is escalating rather than
waiting for extreme catecholamine doses.
- Consider corticosteroids for ongoing vasopressor-dependent septic
shock.
- Treat persistent hypoperfusion with cardiac dysfunction using an
individualized inotropic strategy rather than simply raising MAP.
Before Calling Shock
Refractory
- Reassess source control and adequacy of antimicrobial therapy.
- Exclude occult bleeding, abdominal compartment syndrome, tamponade,
tension pneumothorax, massive pulmonary embolism, adrenal crisis, and
medication error.
- Confirm adequate but not excessive preload.
- Review arterial and central access, infusion concentration, pump
function, and dose calculations.
- Reconsider whether the target MAP is unnecessarily high.
- Reserve angiotensin II, methylene blue, or other rescue therapies
for selected cases with clear rationale, awareness of uncertain outcome
evidence, and appropriate expertise.
Final Take-Home Points
- Norepinephrine is not the enemy. Untreated hypotension and
hypoperfusion are immediately dangerous.
- The correct objective is the lowest effective catecholamine exposure
that maintains individualized tissue perfusion.
- Early norepinephrine and monitored peripheral initiation can reduce
hypotension and fluid loading without waiting for central access.
- A MAP of approximately 65 mm Hg is the usual starting point. Routine
pursuit of 80 to 85 mm Hg adds catecholamine exposure and may harm older
patients.
- CRT-centered, phenotype-based resuscitation reduces fluid and
vasopressor exposure and shortens organ support, but has not shown a
mortality benefit.
- Vasopressin is the best-established nonadrenergic
catecholamine-sparing adjunct, although its survival benefit is
uncertain and no single norepinephrine threshold fits every
patient.
- Corticosteroids accelerate shock reversal. Survival effects vary by
regimen and trial.
- Angiotensin II may be useful in selected catecholamine-resistant
vasodilatory shock, but high-renin and renal-replacement subgroups
remain post hoc hypotheses.
- Beta-blockers should not be used routinely for septic shock. Sinus
tachycardia may be compensatory.
- Methylene blue shortens vasopressor duration in one small trial, but
survival and safety remain uncertain.
- cDPP3 inhibition, histone neutralization,
reinforcement-learning-guided vasopressin, and endotoxin-selected
hemoperfusion are research strategies, not routine standards.
- Every apparent catecholamine-sparing intervention should be judged
by patient-centered outcomes, not by a lower norepinephrine dose
alone.
Selected References
- Dubech A, Picod A, Pierre A, et al. Current and Future Strategies
Aiming at Reducing Catecholamine Exposure in Septic Shock. Crit Care.
2026;30:427. https://doi.org/10.1186/s13054-026-06109-3
- Prescott HC, Antonelli M, Alhazzani W, et al. Surviving Sepsis
Campaign: International Guidelines for Management of Sepsis and Septic
Shock 2026. Crit Care Med. 2026. https://doi.org/10.1097/CCM.0000000000007075
- Prescott HC, Antonelli M, Alhazzani W, et al. Surviving Sepsis
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Apply patient-specific hemodynamic assessment before clinical use.
