Shock recognition and management

Shock is not "feeling shocked." It is a physiological state in which cells throughout the body are dying from oxygen deprivation because blood is not circulating adequately to deliver it. A person in early shock may look worried and slightly pale — they can still talk to you. A person in late shock looks grey, answers slowly, and their skin has the waxy mottled appearance of a body withdrawing circulation from the periphery to protect the heart and brain. The window between those two states is measured in minutes to hours. Acting in the early window is the difference between a recoverable situation and one that is not.

Educational use only

This page provides general educational information for emergency preparedness scenarios when professional medical care is unavailable. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider. Use this information at your own risk.

The four types of shock

Every type of shock involves the same final pathway — inadequate tissue perfusion — but the mechanism differs. Identifying the type determines the treatment. Treating the wrong type can kill the patient faster than the underlying condition.

Hypovolemic shock

Mechanism: The heart has insufficient volume to pump. Caused by blood loss (hemorrhage), plasma loss (burns, severe burns weep fluid), or dehydration (diarrhea, vomiting, excessive sweating).

Appearance: Cold, clammy, pale skin. Rapid weak pulse. Anxiety. This is the classic "trauma shock" presentation.

Field treatment: Stop the loss (control bleeding), replace the volume (fluids), prevent hypothermia.

Distributive shock (septic, anaphylactic, neurogenic)

Mechanism: Blood volume is relatively normal, but the blood vessels have dilated so widely that the same volume can no longer fill the system — the heart is pumping into an expanded container. Blood pressure drops even though there is no fluid loss.

Septic shock: Driven by severe infection. Signs include fever or hypothermia, rapid heart rate, confusion, and a source of infection. The vessels dilate in response to inflammatory mediators.

Anaphylactic shock: Driven by an allergic reaction. Signs include hives, flushing, airway edema, wheezing, hypotension within minutes of allergen exposure.

Neurogenic shock: Driven by spinal cord injury that disrupts sympathetic tone. Paradoxically presents with warm, dry skin and a slow heart rate (bradycardia) — the opposite of most shock types.

Field treatment: Address the trigger. Epinephrine for anaphylaxis. Antibiotics for sepsis. Careful positioning for neurogenic.

Obstructive shock

Mechanism: A physical barrier prevents the heart from pumping effectively despite adequate blood volume. The two most common causes in trauma are tension pneumothorax (air accumulates in the chest, compresses the heart and great veins) and cardiac tamponade (blood fills the sac around the heart, squeezing it until it cannot fill between beats).

Appearance: Distended neck veins (jugular venous distension), hypotension, and in tension pneumothorax — absent breath sounds on one side with tracheal deviation. In tamponade — muffled heart sounds (hard to hear in the field).

Field treatment: Remove the obstruction. Tension pneumothorax requires needle decompression. Tamponade requires pericardiocentesis. Both are covered in chest injuries. Fluids will not fix obstructive shock — the problem is mechanical, not volume.

Cardiogenic shock

Mechanism: The heart muscle itself is failing to pump. Most commonly from a massive heart attack, but also from severe arrhythmia or myocarditis.

Appearance: Signs of pulmonary edema (wet breath sounds, pink frothy sputum, respiratory distress in addition to hypotension). The patient is typically not cold and clammy but may be severely short of breath.

Field treatment: Very limited. Do not give aggressive fluid boluses — adding more volume to a failing pump worsens pulmonary edema. Position for easier breathing, provide oxygen if available, and prioritize rapid transport.

Shock type decision table

Type	Skin	Heart rate	Neck veins	Key clue
Hypovolemic	Cold, pale, clammy	Rapid, weak	Flat	Visible blood loss or fluid loss
Septic	Early: warm, flushed. Late: cold	Rapid	Flat	Fever + infection source
Anaphylactic	Flushed, hives, edema	Rapid	Flat	Allergen exposure + wheezing
Neurogenic	Warm, dry	Slow (bradycardia)	Flat	Spinal injury
Obstructive	Pale to cyanotic	Rapid	Distended	Trauma + absent breath sounds or muffled heart
Cardiogenic	Cool, clammy	Rapid, irregular	Distended	Chest pain + respiratory distress

Compensated vs. decompensated shock

The body fights back. In early (compensated) shock, compensatory mechanisms — adrenaline release, heart rate increase, peripheral vasoconstriction — maintain blood pressure and organ function despite the underlying deficit. The patient looks sick but stable. This phase is the treatment window.

In late (decompensated) shock, the compensatory mechanisms have failed. Blood pressure falls, brain perfusion drops, and the cascade becomes self-amplifying. Each deteriorating organ makes the others worse. In decompensated shock, the probability of survival without definitive hospital care drops sharply.

Compensated shock — early signs

Blood pressure may still read in the normal range. The body is maintaining it — but at a cost.

Heart rate: Elevated — consistently above 100 beats per minute
Blood pressure: May be normal or slightly low (SBP 90–100 mmHg)
Mental status: Anxious, restless, perhaps agitated — early sign of cerebral under-perfusion
Skin: Pale, cool, or slightly clammy as circulation is withdrawn from periphery
Capillary refill: Greater than 2 seconds (squeeze a fingernail, release — it should pink up in under 2 seconds)
Respiratory rate: Elevated (above 20 breaths per minute) as the body attempts to improve gas exchange

Decompensated shock — late signs

Compensatory mechanisms have failed. This is the state most people visualize when they think of "shock."

Heart rate: Tachycardia above 120 in adults; or paradoxically a dropping heart rate as the heart runs out of reserve
Blood pressure: Systolic below 90 mmHg in adults; absent radial pulse is a field estimate of SBP below 80 mmHg
Mental status: Confusion, disorientation, or unresponsiveness
Skin: Grey, mottled, or cyanotic (blue-tinged); cold and clammy throughout the body, not just the periphery
Capillary refill: Greater than 4 seconds or does not refill at all
Urine output: Absent (the kidneys shut down to preserve central circulation)

The deceptively stable patient

Children and fit young adults can maintain near-normal blood pressure until they have lost 30–40% of their blood volume, then collapse abruptly. Never be reassured by a normal blood pressure alone in a trauma patient who has other signs of compensation (tachycardia, pale skin, anxiety). The blood pressure in these patients crashes when compensation fails — and it fails quickly.

The shock index

Shock index = Heart rate ÷ Systolic blood pressure

This is a fast calculation that integrates two vital signs into a single number that is more sensitive than either alone for detecting early shock:

Below 0.7: Generally normal; not in shock
0.7–1.0: Borderline; watch closely, especially in trauma
Above 1.0: Significant concern; treat for shock even if BP is technically "normal"
Above 1.4: Severe; urgent intervention required

Example: A patient with HR 110 and SBP 100 has a shock index of 1.1 — concerning even though the systolic BP is technically normal. This patient needs intervention now, not observation.

Field assessment sequence

Run this sequence in order. Do not jump to treatment before completing the assessment — knowing the type of shock determines whether your treatment helps or kills.

Identify and control any obvious bleeding. Hemorrhagic shock is the most common in trauma and the most immediately treatable. Apply a tourniquet or pack the wound before continuing assessment (see bleeding control for the full procedure).
Assess mental status using AVPU:
A — Alert and oriented: knows who they are, where they are, what happened
V — Responds to Voice: confused or drowsy but responds when spoken to
P — Responds to Pain: only responds to a painful stimulus (sternal rub, nail bed press)
U — Unresponsive: no response to any stimulus
Check the radial pulse: Place two fingers over the radial artery at the wrist. A present, strong, regular radial pulse generally indicates systolic BP above 80 mmHg. A weak, thready, or absent radial pulse at the wrist indicates systolic BP at or below 80 mmHg — deep into decompensated territory.
Check capillary refill: Squeeze the patient's fingernail or thumbnail for 2 seconds, then release. Count the seconds until the nail bed returns to pink. Under 2 seconds is normal. 2–4 seconds is impaired perfusion. Over 4 seconds is critical.
Skin assessment: Look at the hands, face, and inner lip color. Pale, grey, or mottled (blotchy red-and-white pattern) indicates poor perfusion. Diaphoresis (cold sweat) indicates sympathetic activation from shock. Warm, dry, pink skin is reassuring.
Respiratory rate: Count breaths for 15 seconds, multiply by four. Rate above 20 indicates the patient is compensating. Rate above 30 indicates critical compromise of either respiratory mechanics or metabolic acidosis from shock.
Calculate the shock index: HR ÷ SBP. If above 1.0, treat for shock regardless of whether individual vital signs look reassuring.

Hypovolemic shock management

This is the most common type of shock in trauma and the most manageable in the field. The goal is to stop the loss and support the volume until definitive care is available.

Stop the bleeding. Every other intervention is temporary scaffolding around an ongoing drain. A patient bleeding 200 mL/min cannot be resuscitated with fluids in the field. Apply tourniquet, pack wounds, maintain pressure before advancing to the next steps. See bleeding control.
Position the patient: Supine (lying flat) with legs elevated 8–12 inches (20–30 cm). Elevating the legs returns approximately 500 mL (17 oz) of venous blood to the central circulation — a meaningful auto-transfusion in the field. Exceptions: Do not elevate the legs in suspected head injury (raises intracranial pressure), suspected tension pneumothorax (worsens), or if the patient has respiratory distress (let them assume whatever position makes breathing easiest).
Prevent hypothermia. Hypothermia in shock causes coagulopathy — blood stops clotting effectively, turning a manageable bleed into an unstoppable one. Wrap the patient in blankets, sleeping bags, or emergency foil blankets. Place an insulating layer under the patient — the ground pulls heat faster than cold air. In cold environments, this step saves lives as directly as bleeding control.
Oral fluids if the patient is conscious and has no abdominal injury: Do not give plain water — it dilutes sodium and can worsen hyponatremia. Give oral rehydration solution (ORS), a commercial electrolyte drink diluted to half-strength, or a homemade solution (1 liter water + 6 teaspoons sugar + 1/2 teaspoon salt). Do not force fluids on an unconscious patient or a patient who may need surgery — aspiration and a full stomach in the OR are both dangerous.
Do not give fluids if you suspect obstructive shock (absent breath sounds, distended neck veins) — fluid will not help tension pneumothorax or cardiac tamponade and may accelerate deterioration.
Monitor continuously: Reassess mental status, pulse strength, skin color, and capillary refill every 5 minutes. Document trends. Is the patient improving, stable, or worsening? Trends are more meaningful than single readings.

Field note

The question "are you thirsty?" is one of the most useful early shock indicators. The thirst mechanism activates at approximately 1–2% blood volume loss, before most vital sign changes are detectable. A trauma patient who says they are extremely thirsty — especially if they were not thirsty before the injury — should be presumed to be in early compensated shock and treated accordingly.

Anaphylactic shock management

Anaphylaxis is distributive shock caused by a massive allergic reaction. Airways swell, blood vessels dilate massively, and blood pressure crashes. The treatment window is short and epinephrine is the definitive field treatment. Nothing else fixes this.

Recognition

Exposure to an allergen (bee sting, food, medication) within seconds to 30 minutes
Hives (urticaria), flushing, or diffuse skin redness
Throat tightening, difficulty swallowing, or audible stridor
Wheezing or difficulty breathing
Rapid drop in blood pressure with tachycardia
Nausea, vomiting, abdominal cramping

All signs are not required. Anaphylaxis can present primarily as cardiovascular collapse without prominent skin signs.

Epinephrine administration

Retrieve an epinephrine auto-injector (EpiPen, Auvi-Q) or a pre-drawn 1 mg/mL epinephrine syringe if trained.
For adults (and children 66 lbs / 30 kg or over): dose is 0.3 mg intramuscularly. Auto-injectors deliver this dose in a standard adult EpiPen.
For children under 66 lbs (30 kg): dose is 0.15 mg IM. Use a junior-dose auto-injector.
Inject into the outer mid-thigh (vastus lateralis muscle) through clothing if necessary. Do not inject into the buttock (unreliable absorption) or the hand or foot (risk of tissue necrosis).
Hold the injector in place for 10 seconds after firing.
Repeat the dose after 5–15 minutes if there is no response or if symptoms return. A second dose is needed in approximately 16–35% of anaphylactic cases.

Positioning and airway

Position supine with legs elevated unless the patient has significant respiratory distress — if they cannot breathe lying flat, let them sit up or stand.
If unconscious and breathing, place in recovery position (on side) to protect the airway.
Have the patient use their prescribed bronchodilator inhaler for bronchospasm if available.
If airway is compromised and you are trained, prepare for airway management.

After epinephrine

Epinephrine's effect is temporary — lasting 15–20 minutes. The patient must be transported even if they appear to have recovered fully, because biphasic reactions (a second anaphylactic wave after an apparently recovered period) occur in 1–20% of cases, typically 1–8 hours after the initial reaction.

Neurogenic shock management

Neurogenic shock follows spinal cord injury, particularly to the cervical (neck) or high thoracic spine. The injury disrupts the sympathetic nervous system that normally maintains vascular tone and heart rate. The result is a paradoxical presentation that confuses providers accustomed to hypovolemic shock.

Distinguishing features

Feature	Hypovolemic	Neurogenic
Skin	Cold, clammy, pale	Warm, dry, flushed below injury
Heart rate	Rapid (tachycardia)	Slow (bradycardia) or normal
Mechanism	Volume loss	Sympathetic disruption
Leg elevation	Helpful	Helpful but cautious — spinal precautions

Management

Maintain spinal precautions throughout — do not aggressively twist or flex the spine in any direction.
Leg elevation is still appropriate and beneficial but must be done carefully with the spine maintained in neutral alignment.
Keep the patient warm — they have lost the ability to vasoconstrict peripherally and will lose body heat rapidly.
Do not over-resuscitate with fluids. The hypotension is from vasodilation, not from volume loss. Excessive fluid can cause pulmonary edema.
Transport priority — neurogenic shock requires hospital-level vasopressor management (norepinephrine, dopamine) not available in field settings.

Septic shock management

Septic shock is the most lethal form of distributive shock. It occurs when an infection — bacterial, fungal, or viral — triggers a systemic inflammatory response that causes widespread vasodilation, endothelial injury, and organ failure.

Recognizing sepsis before it becomes septic shock

Sepsis (before the shock state): - Known or suspected infection source - Fever above 100.4°F (38°C) or hypothermia below 96.8°F (36°C) - Heart rate above 90 - Respiratory rate above 20 - Confusion or altered mental status

Septic shock = sepsis + hypotension that does not respond to initial fluid resuscitation + signs of organ dysfunction.

Field management

Identify the infection source: A wound with spreading cellulitis, a urinary infection in a catheterized patient, pneumonia, an untreated abdominal infection. Knowing the source guides antibiotic selection.
Begin antibiotics if available: Start broad-spectrum oral antibiotics while arranging transport. For unknown source, amoxicillin-clavulanate 875/125 mg twice daily covers a wide range of common organisms. If the source is clearly pneumonia, doxycycline 100 mg twice daily is appropriate. Note: Antibiotics without drainage of the infection source will not resolve septic shock — transport remains essential.
Aggressive oral hydration: Unlike cardiogenic shock, septic shock genuinely responds to fluid volume. Push 1–2 liters (34–68 oz) of electrolyte solution orally in the first hour if the patient can drink. Signs of response: improving mental status, decreasing heart rate, warming skin.
Fever management: Control fever aggressively with acetaminophen 1,000 mg every 6 hours and ibuprofen 600 mg every 8 hours (if not contraindicated). High fever increases metabolic demand in a patient whose circulation is already compromised.
Monitor blood glucose: Sepsis frequently drives blood sugar dysregulation. Severe hypoglycemia (confusion without other obvious cause in a septic patient) requires sugar administration — a tablespoon of honey under the tongue if the patient can protect their airway.
Escalation: Septic shock is beyond field management capacity. The patient needs IV antibiotics, IV fluid resuscitation titrated to central monitoring, and vasopressors. Any patient in septic shock who cannot be transported immediately is in a deteriorating situation — do everything possible to expedite transport.

Monitoring during treatment

Reassess every 5–10 minutes in active shock. Use the same sequence each time for consistency.

Improvement signs

Heart rate trending down from the peak toward 80–90 bpm
Skin warming and color improving from pale/grey to pink
Capillary refill decreasing (from 4+ seconds toward under 2 seconds)
Patient becoming more alert and oriented
Patient reporting feeling less cold and anxious

Deterioration signs — escalate urgently

Heart rate increasing or crossing 120 bpm
Blood pressure falling (absent radial pulse is a field estimate of SBP < 80 mmHg)
Skin becoming mottled or cyanotic
Confusion deepening toward unresponsiveness
Respiratory rate above 30

Transient improvement is not recovery

A patient who improves after tourniquet application, positioning, and fluids is compensating with help — not recovered. The underlying injury (hemorrhage, infection, anaphylaxis, tension pneumothorax) is still present and still lethal. Temporary improvement is the window to load the patient for transport, not to stand down the urgency.

Shock management checklist

The shock state is the body communicating that something has overwhelmed its compensatory capacity. The job in the field is to identify which something and address it directly — because time is the one variable that cannot be replaced. For the bleeding that most commonly triggers hypovolemic shock, the full tourniquet and wound-packing procedures are covered in bleeding control.