Septic Shock
A life-threatening collapse in blood pressure caused by infection
Quick Facts
- Type: Medical emergency
- Cause: Severe body-wide response to infection
- Action: Call emergency services immediately
- Key signs: Confusion, fast breathing, very low blood pressure
Overview
Septic shock is a medical emergency. If you suspect it, call emergency services (911 or your local number) right away.
Sepsis is the body's overwhelming and damaging response to an infection. Instead of staying contained, the reaction spreads through the bloodstream and injures the body's own tissues and organs. Septic shock is the most severe stage of sepsis, in which blood pressure falls dangerously low and stays low despite fluids, starving organs of oxygen.
Without rapid treatment, septic shock leads to failure of the kidneys, heart, lungs, and other organs and can be fatal. Survival depends heavily on how quickly antibiotics and supportive care are started, so recognizing the early signs of sepsis and acting fast saves lives.
Symptoms
These symptoms require an immediate emergency call. Septic shock develops out of sepsis, so it helps to know the warning signs of both.
- Confusion, disorientation, or extreme sleepiness
- Very fast breathing and a racing heart
- Low blood pressure causing dizziness or fainting
- Cold, clammy, pale, or mottled skin
- Little or no urine
- Fever and chills, or a body temperature that is abnormally low
- A feeling that something is seriously wrong, sometimes described as the worst illness ever felt
In children, watch for fast breathing, a rash that does not fade under pressure, seizures, floppiness, and not waking or interacting. Any of these warrant emergency care.
Causes
Septic shock starts with an infection anywhere in the body that triggers a runaway immune response. Common sources include:
- Lung infections: Pneumonia is a frequent trigger.
- Urinary tract infections: Especially when they spread to the kidneys.
- Abdominal infections: Such as appendicitis, bowel problems, or infected gallbladder.
- Skin and soft tissue infections: Including infected wounds and cellulitis.
- Bloodstream infections: Sometimes related to catheters or other medical devices.
The infection can be bacterial, viral, or fungal. As the body's response intensifies, blood vessels leak and widen, blood pressure drops, and clotting and circulation problems deprive organs of oxygen.
Risk Factors
- Very young or older age
- A weakened immune system from illness or medication
- Chronic conditions such as diabetes, kidney, lung, or liver disease
- Recent surgery, serious wounds, or burns
- Indwelling catheters or other medical devices
- Being seriously ill or in the hospital
Diagnosis
Diagnosis is made urgently, often while treatment is already beginning:
- Vital signs: Blood pressure, heart rate, breathing rate, temperature, and oxygen level are assessed immediately.
- Blood tests: Checking for signs of infection, organ stress, lactate levels, and how organs are functioning.
- Cultures: Blood, urine, and other samples help identify the source and type of infection.
- Imaging: X-rays, ultrasound, or CT scans locate the infection.
A persistently low blood pressure that does not improve with fluids, together with signs of poor organ function, distinguishes septic shock from less severe sepsis.
Treatment
Septic shock is treated in the hospital, usually in intensive care, and speed is critical. The main steps include:
- Antibiotics: Broad-spectrum antibiotics are given as fast as possible to fight the infection.
- Intravenous fluids: Large amounts of fluid are given to support blood pressure and circulation.
- Medications to raise blood pressure: Drugs called vasopressors are used when fluids alone are not enough.
- Organ support: Oxygen, breathing machines, and dialysis may be needed if organs are failing.
- Source control: Draining an abscess or removing an infected device may be necessary.
Early recognition and prompt antibiotics make the biggest difference to survival.
Prevention
- Treat infections promptly and complete prescribed antibiotic courses
- Keep wounds clean and watch for signs of infection
- Stay up to date with recommended vaccinations
- Manage chronic conditions such as diabetes well
- Practice good hand hygiene
- Seek care early if an infection is getting worse rather than better
When to See a Doctor
Call emergency services immediately if someone with an infection becomes confused, breathes very fast, has cold clammy or mottled skin, passes little urine, faints, or feels desperately unwell. It is reasonable to ask a medical professional directly, "Could this be sepsis?" Do not wait to see if symptoms improve on their own. Acting at the first signs of sepsis, before full shock develops, gives the best chance of recovery.
Frequently Asked Questions
What is the difference between sepsis and septic shock?
Sepsis is the body's harmful, body-wide response to an infection. Septic shock is its most severe stage, in which blood pressure falls dangerously low and stays low despite fluids, depriving organs of oxygen. Septic shock carries a higher risk of organ failure and death.
What are the first warning signs to watch for?
Key warning signs include new confusion, very fast breathing, a racing heart, low blood pressure, cold or mottled skin, passing little urine, and feeling extremely unwell. If someone with an infection shows these, call emergency services and ask whether it could be sepsis.
Why is fast treatment so important in septic shock?
Each hour of delay in starting antibiotics and supporting blood pressure increases the chance of organ damage and death. Rapid antibiotics, fluids, and intensive care give the best chance of survival, which is why septic shock is treated as a time-critical emergency.
Who is most at risk of septic shock?
The very young, older adults, people with weakened immune systems, and those with chronic conditions such as diabetes or kidney, lung, or liver disease are at higher risk. Recent surgery, serious wounds, and indwelling catheters also increase the risk.
References
- Centers for Disease Control and Prevention (CDC). Sepsis.
- Mayo Clinic. Sepsis - Symptoms and causes.
- National Institute of General Medical Sciences (NIGMS). Sepsis.
- MedlinePlus, U.S. National Library of Medicine. Septic shock.