Study guide
10.3 Severe Sepsis, Septic Shock, and Infective Endocarditis
ABIM Neurocritical Care Subspecialty Certification Exam
Track your progress as you read
Finished sections get a check mark.
1 Introduction & Exam Overview
1.1 Current Exam Facts 1.2 Eligibility, Practice Pathway, and the IM Training Route 1.3 Format, Scoring, Pearson VUE, and Score Reports 1.4 How to Use This Independent Study Guide
2 ICU Neurologic Exam, Cerebral Physiology, and CSF
2.1 Neurological Examination in the ICU 2.2 Cerebral Physiology, ICP, CBF, and Autoregulation 2.3 CSF Physiology
3 Core Neuropharmacology
3.1 Osmotic Agents 3.2 Anti-Seizure Drugs 3.3 Anesthetics, Sedatives, Analgesia, and Paralytics 3.4 Antihypertensives, Vasopressors, and Inotropes
4 Reperfusion Drugs, Airway, and Ventilation
4.1 Thrombolytics, Anticoagulants, and Antiplatelets 4.2 Reversal of Anticoagulation After Acute Hemorrhage 4.3 Airway Management and Tracheostomy 4.4 Mechanical Ventilation
5 Hemodynamics and Shock
5.1 Hemodynamic Monitoring 5.2 IABP, Temporary VADs, LVAD, and ECMO 5.3 Diagnosis and Management of Shock
6 Nutrition, Temperature, and ICU Prophylaxis
6.1 Nutrition (01.J) 6.2 Temperature Control (01.K) 6.3 ICU Prophylaxis, Delirium, and Early Mobility (01.L)
7 General Trauma
7.1 Emergency Evaluation of Polytrauma, Chest, and Abdominal Trauma 7.2 Long-Bone Fractures and Fat Embolism 7.3 Burns, Electrical Injury, and Hanging/Strangulation
8 Pulmonary Critical Care
8.1 Pulmonary Physiology and ARDS (01.N.1–2) 8.2 PE, Pneumonia, and Pulmonary Edema (01.N.3, 7–8) 8.3 COPD, Asthma, PAH, and Bronchoscopy Basics (01.N.4–6, 9)
9 Cardiovascular Critical Care
9.1 Cardiovascular Physiology, Stress Cardiomyopathy, ACS, and Valves 9.2 Arrhythmias and Pacing 9.3 Acute Aortic Dissection and Cardiac Ultrasound
10 Renal and Infectious Disease
10.1 AKI, RRT, and Renal Drug Dosing 10.2 Acid-Base and Electrolyte Disorders 10.3 Severe Sepsis, Septic Shock, and Infective Endocarditis 10.4 Antimicrobial Use and Infection in the Immunosuppressed
11 Endocrine and Salt-Water Disorders
11.1 Pituitary Apoplexy, DI, and Panhypopituitarism (01.R.1–4) 11.2 SIADH and Cerebral Salt Wasting (01.R.5–6) 11.3 Thyrotoxicosis, Myxedema, Adrenal Crisis, and Dysglycemia (01.R.7–9)
12 Gastrointestinal Critical Care
12.1 GI Physiology, Acute Abdomen, Bleed, Ileus, and Perforation (01.S.1–5) 12.2 Mesenteric Ischemia and Abdominal Compartment Syndrome (01.S.6–7) 12.3 Fulminant Liver Failure, Cirrhosis Decompensation, and Hepatic Dosing (01.S.8–10)
13 Hematologic Disorders
13.1 Anemia, Transfusion, Thrombocytopenia, Coagulopathy, and DIC (01.T.1–4) 13.2 VTE in the Neuro ICU (01.T.5) 13.3 Chemo/Immune, SCT, CAR-T, Sickle Cell, and TMA (01.T.6–10)
14 Neuroimaging
14.1 CT of Brain and Spine 14.2 MRI and CT/MR Perfusion 14.3 Noninvasive Angiography and Catheter Angiography
15 EEG, EMG, and CSF Analysis
15.1 EEG, Standard and Processed (02.B) 15.2 Basic EMG Interpretation (02.G) 15.3 CSF Analysis (02.H)
16 ICP, TCD, and Multimodality Monitoring
16.1 ICP Monitoring (02.C) 16.2 Transcranial Doppler (02.D) 16.3 Brain-Tissue Oxygen and Multimodality Monitoring (02.E–F)
17 Brain Death and Bedside Procedures
17.1 Brain Death Prerequisites and Clinical Exam (02.I) 17.2 Apnea Testing and Ancillary Studies (02.I) 17.3 Vascular Access, Thoracic Echo, and Lung Ultrasound (02.J–L)
18 Coma, Anoxia, and Intracranial Hypertension
18.1 Coma and Other States of Altered Consciousness (03.A) 18.2 Global Anoxia-Ischemia and Post-Resuscitation Encephalopathy (03.A.1) 18.3 Toxidromes, ICU Delirium, and Hypertensive Encephalopathy (03.A.2–4) 18.4 Intracranial Hypertension as a Disease State (03.B)
19 Acute Ischemic Stroke
19.1 IV Reperfusion Therapy (03.C.3) 19.2 Mechanical Thrombectomy Windows and Imaging Selection (03.C.3) 19.3 Malignant Hemispheric Infarction and Basilar Artery Occlusion (03.C.1–2)
20 Intraparenchymal Hemorrhage
20.1 Intracerebral Hematoma (03.D.1) 20.2 Cerebellar Hematoma (03.D.2) 20.3 Intraventricular Hemorrhage (03.D.3)
21 SAH, CVST, and Spinal Cord Infarction
21.1 Aneurysmal Subarachnoid Hemorrhage (03.E.1) 21.2 Non-Aneurysmal SAH (03.E.2) 21.3 Cerebral Venous Sinus Thrombosis (03.F) 21.4 Spinal Cord Infarction (03.G)
22 Vascular Anomalies and Traumatic Brain Injury
22.1 Unruptured Aneurysm, Cavernoma, AVM, and Dural AVF (03.H) 22.2 Diffuse Axonal Injury and Cerebral Contusions (03.I.1–2) 22.3 Epidural Hematoma, Subdural Hematoma, and Penetrating Injury (03.I.3–4, 7) 22.4 Arterial Dissection and Carotid-Cavernous Fistula (03.I.5–6)
23 Spine, Hydrocephalus, and CNS Infection
23.1 Spinal Cord Injury, Central Cord, and Neurogenic Shock (03.J) 23.2 Unstable Spine Fractures (03.K) 23.3 Hydrocephalus and CSF Diversion (03.L) 23.4 Acute CNS Infections (03.M)
24 Seizures and Neuromuscular Emergencies
24.1 Status Epilepticus and Seizures (03.N) 24.2 Guillain-Barré Syndrome (03.O.1) 24.3 Myasthenic Crisis (03.O.2) 24.4 Motor Neuron Disease, Acute Myopathies, Rhabdomyolysis, and CINM (03.O.3–6)
25 Inflammatory Disease, Neuro-Oncology, and Special Populations
25.1 Fulminant Demyelinating Diseases (03.P) 25.2 Autoimmune Encephalitis and Acute Autonomic Hyperactivity (03.Q–R) 25.3 Neuro-Oncology and Treatment Complications (03.S) 25.4 Pregnancy/Post-Partum, Post-Transplant, and Pediatric Patients (03.T–U)
26 Neurosurgical and Perioperative Complications
26.1 Postoperative Seizures, Hemorrhage, Ischemia, and Hyperperfusion (04.A, C, D, H) 26.2 Infection, CSF Leak, and Pneumocephalus (04.B, E, F) 26.3 Complications of EVD and Lumbar Drain (04.G, I)
27 Ethics, Prognostication, and Organ Donation
27.1 Communication, Decision-Makers, Advance Directives, and DNR (05.A, B, G) 27.2 Uncertainties of Prognostication and the Self-Fulfilling Prophecy (05.C) 27.3 Palliative Care, Withdrawal, Withholding, and Futility (05.D–F) 27.4 Donation After Cardiac Death and Care of the Organ Donor (05.H–I)
10.3 Severe Sepsis, Septic Shock, and Infective Endocarditis
Key Takeaways Explain This Topic AI
Surviving Sepsis Campaign Hour-1 care is lactate, blood cultures before antibiotics when that does not substantially delay drugs (under about 45 minutes), immediate antimicrobials, 30 mL/kg crystalloid for hypotension or lactate ≥4 mmol/L, and vasopressors for MAP ≥65 mmHg.
Norepinephrine is the first-line septic-shock vasopressor; add vasopressin rather than endlessly climbing norepinephrine, and do not wait for a central line if a suitable peripheral vein can start the drug.
Meningitis, ventriculitis, and infected CSF hardware are neuro ICU sources that need drainage or device removal, not only a broader spectrum sticker.
Infective endocarditis can throw septic emboli and mycotic aneurysms; endocarditis itself is not an anticoagulation indication, and anticoagulation is held or stopped after stroke or intracranial hemorrhage.
Conceptual surgical indications are heart failure from valve destruction, uncontrolled infection including abscess, and recurrent emboli with remaining vegetation; image the brain and consider lumbar puncture before anticoagulation if hemorrhage is a concern.
Last updated: September 2026
Sepsis kills brain-injured patients by stealing MAP, raising temperature, and seeding the CSF or heart valves. This independent ExamFinch section covers Sepsis-3 language, Surviving Sepsis Campaign (SSC) Hour-1 actions from the 2021 adult guidelines, why norepinephrine is first-line, how meningitis and ventriculitis function as source-control problems, and the neurologic complications of infective endocarditis (IE) —embolic stroke, mycotic aneurysm , anticoagulation decisions, and conceptual operative indications. SSC is a named source, not a claim that ExamFinch rewrites that campaign.
Sepsis and septic shock, stripped for the exam
Sepsis is life-threatening organ dysfunction from a dysregulated response to infection, operationalized as an acute SOFA rise of 2 or more. Septic shock is a subset with underlying circulatory and cellular abnormalities: vasopressors are required to keep MAP ≥65 mmHg and lactate is >2 mmol/L despite adequate volume. You do not need a perfect SOFA worksheet to start treatment. Fever plus hypotension plus a likely source is enough to move.
Neuro ICU modifiers: fever raises cerebral metabolic demand. Hypotension drops CPP. Hypercapnia from respiratory failure raises ICP. A “soft” MAP of 60 mmHg that a medical ICU might tolerate can infarct a recently recanalized hemisphere. You still use the SSC MAP floor of 65 mmHg as the septic-shock target unless a monitored ICP or an autoregulation discussion has set a different CPP goal—and even then you do not leave the patient at MAP 50 mmHg because “the brain likes it low.”
Hour-1 concepts (SSC 2021)
SSC groups initial resuscitation as a Hour-1 bundle . Not every checkbox will finish at minute 60, but you start them on recognition:
Measure lactate ; repeat if the first value is >2 mmol/L .
Obtain blood cultures before antibiotics if that causes no substantial delay (SSC language: under about 45 minutes ).
Give broad-spectrum antimicrobials immediately , ideally within 1 hour when septic shock or a high likelihood of sepsis is present.
Begin 30 mL/kg crystalloid for hypotension or lactate ≥4 mmol/L .
Start vasopressors during or after fluids to keep MAP ≥65 mmHg .
The culture rule is the one people fail. If the patient is crashing, do not wander looking for a second set of cultures for 20 minutes . Draw what you can on the way to the drug. If the patient is stable enough that two blood-culture sets and an EVD CSF sample will take 10 minutes, take them. CSF, urine, and sputum are source cultures, not a reason to park antibiotics at the nursing station.
Volume is the other trap. 30 mL/kg is the SSC starting crystalloid dose for hypotension or a lactate ≥4 mmol/L, using balanced crystalloid preferentially over 0.9% saline in the 2021 document. In a patient with malignant edema, hydrocephalus, or an open belly, you still give what perfusion needs, but you reassess after the first liters with lactate, capillary refill, ultrasound, and ICP. You do not infuse 3 L blindly into a tight brain because a bundle poster said so. Balanced fluid does not cancel the need for source control.
Norepinephrine and the rest of the pressor stack
SSC recommends norepinephrine as first-line over dopamine, epinephrine, or vasopressin as monotherapy. Dopamine is more arrhythmogenic. If norepinephrine is unavailable, epinephrine or dopamine are stopgaps. When MAP remains low on norepinephrine, add vasopressin (often considered around norepinephrine 0.25–0.5 µg/kg/min ) rather than doubling norepinephrine indefinitely. Epinephrine is a later add. Angiotensin II appears in refractory vasodilatory shock in selected centers; it is not the opening move.
Do not delay norepinephrine for a triple-lumen insertion if a proximal peripheral or intraosseous line can start the infusion. SSC allows peripheral norepinephrine for a limited time through an appropriate vein. In a patient with ICP 30 mmHg, every minute at MAP 55 mmHg is a CPP emergency.
Steroids: for septic shock with ongoing vasopressor need, hydrocortisone is a SSC suggestion, not a substitute for source control. It is a different decision from dexamethasone for pneumococcal meningitis.
Neurologic sources: meningitis and ventriculitis
Community meningitis, postoperative meningitis, and external ventricular drain (EVD) or shunt ventriculitis are sepsis sources sitting in your unit. Hour-1 still applies, but source control means CSF sampling , imaging for abscess or empyema , and device removal or exchange when the hardware is infected. Broad abdominal coverage with piperacillin-tazobactam does not treat meningitis (see the next section on blood–brain barrier penetration). If the patient has an EVD and new fever, cloudy CSF, or unexplained lactate, culture the CSF and start meningitis-dose agents the same hour you start norepinephrine.
Other neuro sources: sinusitis in intubated patients, hospital pneumonia, urinary catheters, surgical wounds, and infected scalp incisions. A “culture-negative” septic shock after clipping may still be a missed abdominal catastrophe or line infection; look below the neck.
Infective endocarditis: embolic stroke and mycotic aneurysm
Left-sided vegetations throw to brain, spleen, and kidney. Staphylococcus aureus , streptococci, and enterococci dominate native-valve disease; staphylococci dominate prosthetic valves and injection-drug right-sided disease (which more often embolizes to lung). Neurologic presentations include ischemic stroke, hemorrhagic transformation, meningitis, and mycotic (infectious) aneurysms from septic embolization into vasa vasorum or vessel wall.
Any IE patient with headache, a new deficit, meningismus, or unexplained coma needs brain imaging . MRI finds silent emboli often; CT is faster when you need to exclude hemorrhage before anticoagulation or surgery. Mycotic aneurysms may be small and distal; CTA, MRA, or catheter angiography is required when the story fits (delayed hemorrhage, SAH, or IE plus headache). Ruptured or enlarging mycotic aneurysms need endovascular or surgical treatment, often before valve surgery and before restarting anticoagulation, when the heart can wait.
When not to anticoagulate
IE is not itself an indication for anticoagulation. Vegetations are infected fibrin; blood thinners do not reliably prevent emboli and they do increase intracranial hemorrhage. American Heart Association adult IE guidance: for mechanical-valve IE with embolic stroke , it is reasonable to hold anticoagulation for at least 2 weeks of antibiotics to reduce hemorrhagic conversion. Intracranial hemorrhage: stop anticoagulation. Native-valve IE with ischemic stroke should not get new warfarin “for the vegetation.” If a mechanical valve absolutely requires coverage, teams often use short-acting unfractionated heparin after imaging shows a stable, small infarct—and they accept that this is a multidisciplinary, high-risk call, not an automatic restart.
Antiplatelet drugs are not a stroke-prevention strategy for IE either, unless there is a separate coronary or stent indication.
Lumbar puncture before anticoagulation if hemorrhage or meningitis is in play
If the deficit could be meningitis, SAH, or a hemorrhagic infarct, do not start heparin on the way to CT . Image first. If imaging is negative for mass effect and you still need CSF (meningitis overlap, or mycotic aneurysm not yet excluded as a sentinel leak), a lumbar puncture (LP) before therapeutic anticoagulation is the safer sequence: an LP into an occult hematoma or a fully anticoagulated patient with an undiagnosed mycotic leak is a disaster. After a traumatic LP, delay therapeutic anticoagulation until you know the fluid and the imaging. This is the same logic as “CT before LP” in possible bacterial meningitis with mass-effect risk, now applied to the IE patient you were about to heparinize for a mechanical valve.
Conceptual surgical indications
You are not being asked to quote millimeter vegetation cutoffs from memory. Know the three buckets that send IE to the operating room:
Bucket What you are seeing Why surgery
Heart failure Acute regurgitation, pulmonary edema, cardiogenic shock Antibiotics will not rebuild a destroyed leaflet
Uncontrolled infection Abscess, fistula, prosthetic dehiscence, fungus, persistent bacteremia Drugs cannot sterilize an abscessed annulus
Embolization risk Recurrent emboli, large remaining mobile vegetation Each additional brain hit may be the last
Timing versus the brain: silent infarcts and TIAs usually should not delay urgently indicated valve surgery. A large ischemic stroke often leads teams to wait on the order of days to ~4 weeks if the heart can wait, because cardiopulmonary bypass and heparinization can convert the infarct. ICH commonly delays surgery ~4 weeks when the valve is stable. If the patient is in refractory heart-failure shock from a flail leaflet, the heart wins and you operate with eyes open. That nuance is the exam, not a single universal day count.
Putting sepsis and IE together on one shift
A febrile patient with a new hemiparesis is not “just a stroke” until you have thought about IE and meningitis. Listen for a regurgitant murmur, look at nail beds and fundi, get blood cultures before antibiotics if you can do it immediately, and echo once the airway and CPP are stable. A transesophageal echocardiogram is more sensitive for vegetations and abscess than transthoracic imaging, but it does not precede Hour-1 drugs in shock.
Source control in IE is the surgeon and the duration of antibiotics, not a PICC and a prayer. Source control in ventriculitis is the drain. Source control in bowel perforation is the abdomen. SSC language without source control is incomplete care.
Exam traps
Waiting an hour for cultures in frank septic shock. Giving 30 mL/kg into an already overloaded, high-ICP brain without reassessment. Starting dopamine because “renal dose” folklore. Covering EVD infection with piperacillin-tazobactam. Anticoagulating native-valve IE to “stabilize the vegetation.” Restarting warfarin the night of an embolic stroke because the INR is 1.6. Skipping vascular imaging in IE plus delayed intracranial hemorrhage. Delaying a clearly indicated valve operation for a tiny silent MRI lesion when the patient is drowning in pulmonary edema.