What is the pathophysiology of sepsis?
Sepsis usually begins with an infection (or presumed infection) that triggers the body’s immune response. The body releases chemicals that cause inflammation → blood vessel dilation → hypotension.
What must happen before sepsis develops?
The patient must first meet SIRS criteria and have a presumed or identified infection.
What is the sequence of sepsis progression?
SIRS (with presumed/identified infection) → Sepsis → MODS → Septic Shock.
How are MODS and septic shock related?
They may be used interchangeably, depending on which criteria are met.
What are common signs of infection that can lead to sepsis?
Fever, chills, gross-looking wound, UTI symptoms, pyelonephritis symptoms.
What causes hypotension in sepsis?
Inflammatory mediators cause vasodilation and increased capillary permeability → decreased vascular resistance and hypotension.
What are the clinical manifestations of sepsis?
• Meets SIRS criteria first + presumed/confirmed infection
• Fever or hypothermia
• Chills
• Tachycardia
• Tachypnea
• Hypotension
• Confusion or altered mental status
• Cool, clammy skin
• Weakness or fatigue
What is the first diagnostic step for suspected sepsis?
Complete history and physical (H&P) and thorough assessment to find the infection source.
What lab findings indicate sepsis?
• Leukocytosis – Elevated WBC
• Thrombocytopenia – Low platelets
• Elevated lactate ≥ 2.5 mmol/L (indicates poor perfusion)
• Elevated procalcitonin (infection marker)
• Abnormal PT/INR & PTT (DIC risk).
What is DIC and how is it related to sepsis?
Disseminated Intravascular Coagulation – widespread microclotting and bleeding caused by severe sepsis and inflammation.
What is the purpose of obtaining blood cultures in sepsis?
To identify the causative organism and guide antibiotic therapy.
How many sets of blood cultures should be drawn and when?
2 sets before administering any antibiotics.
What imaging studies help locate the source of infection in sepsis?
Chest X-ray, Ultrasound, CT scan — all based on H&P findings.
What is the key to successful sepsis treatment?
Early recognition and rapid intervention.
What is the Sepsis Bundle and when must it be completed?
A group of critical interventions (labs, blood cultures, fluids, antibiotics) that must be done within 3 hours of sepsis recognition.
What are the main components of the Sepsis Bundle?
• Lab levels (including lactate)
• Blood cultures (before abx)
• Fluid resuscitation
• IV antibiotics.
What are the main treatment goals in sepsis?
Control infection, restore blood flow, support failing organs (especially kidneys), and maintain perfusion and oxygenation.
What type of fluids are used in sepsis treatment?
Normal Saline (NS) or Lactated Ringer’s (LR).
What is the standard fluid bolus for sepsis patients?
30 mL/kg isotonic crystalloids for every patient, every time (unless contraindicated).
Can you change the fluid resuscitation parameters independently?
No — only under physician’s orders.
What does persistent hypotension after fluids indicate?
Septic shock. Start vasopressors (e.g., norepinephrine).
When should antibiotics be given in sepsis?
Within 1 hour of diagnosis.
Why is source control important in sepsis?
To eliminate the infection source — e.g., remove a contaminated Foley catheter in urosepsis.
What are other treatment priorities for sepsis?
• Oxygen administration
• Blood glucose control (hyperglycemia common)
• Organ support (renal, respiratory).