Sepsis

Sepsis is a life-threatening condition that arises when the body’s response to infection injures its own tissues and organs. It can progress to septic shock, with profound circulatory and cellular/metabolic abnormalities that substantially increase mortality. Sepsis is a medical emergency — early recognition and rapid treatment with antibiotics, fluids, and source control save lives.

Any infection can trigger sepsis, but pneumonia, urinary tract infections, abdominal infections, and skin/soft-tissue infections are common sources. Older adults, infants, and people with chronic illness or weakened immunity are at highest risk. Hospitals use screening tools and care bundles to speed identification and treatment.

Sepsis can present with a combination of:

• Fever, shivering, or feeling very cold
• Clammy or sweaty skin
• Confusion or disorientation
• Shortness of breath
• Rapid heart rate
• Low blood pressure
• Extreme pain or discomfort
• Reduced urine output

In older adults and immunocompromised people, fever may be absent and confusion or functional decline may be the main clue. Septic shock includes sepsis with persistent low blood pressure requiring vasopressors and elevated lactate despite adequate fluid resuscitation.

Sepsis is triggered by an infection (bacterial, viral, fungal, or parasitic) that provokes a dysregulated host response. Common sources include:

• Lung (pneumonia)
• Urinary tract (including kidney infection)
• Abdomen (appendicitis, diverticulitis, gallbladder infection, perforated viscus)
• Skin and soft tissue (cellulitis, infected wounds)
• Bloodstream infections related to catheters or endocarditis
• Central nervous system infections

Sometimes the source is not immediately apparent.

Higher risk groups include:

• Adults 65 years and older
• Infants and young children, especially premature infants
• People with chronic diseases (diabetes, kidney disease, lung disease, cancer)
• Weakened immune systems (chemotherapy, transplant, HIV, corticosteroids)
• Recent hospitalization, surgery, or invasive devices (IV lines, urinary catheters, breathing tubes)
• Severe injuries or burns
• Previous sepsis

Sepsis can lead to:

• Septic shock
• Acute respiratory distress syndrome (ARDS)
• Acute kidney injury requiring dialysis
• Disseminated intravascular coagulation and bleeding or clotting
• Liver dysfunction
• Limb ischemia and amputation
• Cognitive impairment and long-term physical disability among survivors
• Death

Post-sepsis syndrome includes lasting fatigue, cognitive problems, and mood disorders in many survivors.

Prevention strategies:

• Vaccination (influenza, pneumococcal, COVID-19, meningococcal, Hib as indicated)
• Good hygiene and wound care
• Managing chronic conditions
• Judicious use of invasive devices and early removal when no longer needed
• Prompt treatment of infections
• Infection-control practices in healthcare settings

There is no single diagnostic test for sepsis. Clinicians use:

• Clinical assessment (suspected or confirmed infection plus organ dysfunction)
• SOFA or qSOFA scores and institutional screening tools
• Blood tests: lactate, complete blood count, metabolic panel, coagulation studies, blood cultures (before antibiotics when possible without delaying treatment)
• Cultures from other sites (urine, sputum, wounds)
• Imaging to locate the source

Treatment begins as soon as sepsis is suspected, without waiting for all results.

Seek emergency care immediately for infection symptoms combined with confusion, difficulty breathing, rapid heart rate, extreme pain, clammy skin, or very low urine output. Mention any recent surgery, catheters, or immune-compromising conditions. Do not wait — hours matter.

The Surviving Sepsis Campaign and similar guidelines emphasize rapid action:

• Immediate — measure lactate, obtain cultures, start broad-spectrum IV antibiotics within one hour for septic shock and as soon as possible for sepsis
• Fluids — rapid intravenous crystalloid resuscitation for hypotension or elevated lactate
• Vasopressors (norepinephrine first-line) if blood pressure remains low after fluids
• Source control — drain abscesses, remove infected devices, surgically manage perforated viscera as soon as feasible
• Oxygen and mechanical ventilation when needed
• Supportive care for organ failure (dialysis, glycemic control, VTE prophylaxis, nutrition)
• De-escalate antibiotics based on culture results and clinical response

Care is best delivered in a setting equipped for critical care monitoring.

Sepsis requires hospital treatment. After discharge:

• Complete all prescribed antibiotics and follow-up visits
• Monitor for recurrent infection symptoms
• Gradually rebuild strength with physical activity as advised
• Seek support for cognitive, emotional, and physical recovery (post-sepsis syndrome)
• Keep vaccinations current and manage chronic conditions closely

In an emergency, convey: recent infections or procedures, immune status, chronic illnesses, medicines (especially immunosuppressants), and how quickly symptoms progressed. Family members should share observed confusion or behavioral changes.