Evidence-based recognition and management of all shock types for GCC critical care nurses. Covers clinical recognition, haemodynamic profiles, immediate interventions and GCC-specific epidemiology. For haemodynamic parameters and monitoring, see the Haemodynamic Monitoring Guide.
Shock is a life-threatening condition of inadequate tissue perfusion relative to metabolic demand, leading to cellular hypoxia, metabolic dysfunction, and — if untreated — irreversible organ failure and death.
Inadequate O₂ delivery → Cellular hypoxia → Anaerobic metabolism → Lactic acidosis → Mitochondrial failure → Cell death → Organ dysfunction → Multi-Organ Failure (MOF)
Blood pressure can be maintained until 30–40% blood/fluid loss via compensatory mechanisms. Hypotension is a LATE sign. Treat earlier clinical signs aggressively.
Shock Index = Heart Rate (bpm) ÷ Systolic Blood Pressure (mmHg). A quick bedside tool for early shock detection — use with clinical context.
| SI Value | Interpretation | Action Priority |
|---|---|---|
| <0.6 | Normal baseline (some hyperdynamic states) | Routine monitoring |
| 0.6–1.0 | Normal / physiological variation | Monitor and reassess |
| 1.0–1.4 | Mild-Moderate shock — early warning | Urgent assessment, fluid challenge, notify team |
| >1.4 | Severe shock — critical | Immediate resuscitation, activate MET/ICU, senior review |
SI may be falsely reassuring in: patients on beta-blockers (blunted HR response), elderly (baseline bradycardia), athletes. Always integrate with clinical picture. Trending SI is more valuable than a single reading.
| Stage | Clinical Features | Reversibility |
|---|---|---|
| Compensated | Tachycardia, tachypnoea, maintained BP, anxiety, cool peripheries, mild oliguria | High — rapid response to treatment |
| Decompensated | Hypotension, AMS, worsening oliguria, metabolic acidosis, worsening perfusion | Moderate — requires urgent aggressive resuscitation |
| Irreversible | Refractory hypotension despite resuscitation, multi-organ failure, disseminated intravascular coagulation (DIC) | Very low — supportive care, consider goals of care |
mmol/L — Normal. Adequate tissue perfusion.
mmol/L — Elevated. Hypoperfusion / early shock. Investigate cause.
mmol/L — Severe. Critical hypoperfusion. Immediate intervention.
Airway: Patent? Sounds? Secretions? — apply suction, airway adjunct, or call airway team if compromised. C-spine precautions if trauma.
Breathing: Rate, depth, SpO₂, auscultation. Apply high-flow O₂ via non-rebreather mask (15 L/min). Assess for tension pneumothorax, haemothorax, flail chest.
Circulation: HR, BP (both arms if aortic dissection suspected), capillary refill, skin colour and temperature, JVP, active haemorrhage control. IV access ×2 large bore (16G min). 12-lead ECG.
Disability: GCS / AVPU, pupil response, blood glucose (hypoglycaemia can mimic/worsen shock), temperature (sepsis, heat stroke), BM strip.
Exposure: Full body examination — trauma wounds, rashes (anaphylaxis, meningococcaemia), abdominal examination, limb assessment. Maintain dignity and normothermia.
FBC, U&E, LFTs, coagulation screen, ABG/VBG (lactate, pH), blood glucose, cross-match/group & save, blood cultures ×2 (if sepsis suspected), troponin (if cardiogenic), D-dimer / CT-PA (if PE), FAST ultrasound (trauma/tamponade), CXR, 12-lead ECG.
Central Venous Oxygen Saturation (ScvO₂) reflects the balance between oxygen delivery and consumption at the tissue level. Measured via central venous catheter (superior vena cava).
| ScvO₂ Value | Interpretation | Action |
|---|---|---|
| ≥70% | Target achieved — adequate tissue oxygen delivery | Maintain resuscitation, monitor trends |
| 60–70% | Borderline — increased O₂ extraction | Optimise Hb, CO, SaO₂; reassess fluid status |
| <60% | Inadequate delivery — severe mismatch | Urgent: improve CO (dobutamine), correct anaemia (transfuse if Hb <70), optimise ventilation |
ScvO₂ (from CVC in SVC) is typically ~5% higher than mixed venous SvO₂ (from PA catheter). Target ScvO₂ ≥70% in septic shock aligns with Early Goal-Directed Therapy principles. Note: normal or high ScvO₂ in sepsis may indicate impaired O₂ utilisation, not adequate delivery.
Caused by significant reduction in intravascular volume leading to reduced preload, decreased cardiac output, and compensatory vasoconstriction. Most common shock type encountered outside ICU.
| Class | Blood Loss | % Volume | HR | SBP | RR | Mental State | Fluid |
|---|---|---|---|---|---|---|---|
| Class I | <750 ml | <15% | <100 | Normal | 14–20 | Normal / mild anxiety | Crystalloid |
| Class II | 750–1500 ml | 15–30% | 100–120 | Normal | 20–30 | Anxious | Crystalloid |
| Class III | 1500–2000 ml | 30–40% | 120–140 | Decreased | 30–40 | Confused | Crystalloid + blood |
| Class IV | >2000 ml | >40% | >140 | Very low | >35 | Lethargic / obtunded | Immediate MTP |
Class III shock (30–40% volume loss) is the critical threshold where blood transfusion becomes likely. Do NOT wait for Hb result if clinical signs are present — activate Massive Transfusion Protocol (MTP) based on clinical assessment.
Before giving repeated fluid boluses, assess fluid responsiveness: Passive Leg Raise (PLR) test — raise legs 45° for 60–90 seconds. If CO/pulse pressure increases >10%, patient is fluid-responsive. Reduces unnecessary fluid overload and pulmonary oedema.
In penetrating trauma without TBI: target SBP 80–90 mmHg (not normal) until surgical haemorrhage control is achieved. Over-aggressive resuscitation can dilute clotting factors, dislodge clots, and worsen haemorrhage. Applies to stab wounds, GSW — NOT to blunt trauma or head injury.
Trigger MTP when: estimated blood loss >150 ml/min, need for >10 units RBC in 24 hours, or clinical haemorrhagic shock Class III–IV.
Hypothermia (<36°C) + Acidosis (pH <7.35) + Coagulopathy (INR >1.5) = Lethal Triad. Each component worsens the others. Use fluid warmers, warming blankets, MTP early.
Characterised by massive vasodilation causing maldistribution of blood flow despite normal or elevated cardiac output. Effective circulating volume is inadequate despite normal total blood volume. Subtypes: Septic, Anaphylactic, Neurogenic.
Infection → SIRS → vasodilation, endothelial injury, capillary leak, myocardial depression. Most common ICU shock type in GCC.
IgE-mediated mast cell/basophil degranulation → histamine + mediator release → massive vasodilation + bronchospasm + capillary leak.
Spinal cord injury → loss of sympathetic tone below lesion → hypotension + bradycardia + warm extremities (paradoxical in shock).
Sepsis + vasopressor required to maintain MAP ≥65 mmHg + serum lactate >2 mmol/L despite adequate fluid resuscitation. In-hospital mortality >40%.
Measure lactate: Obtain serum lactate. If >2 mmol/L — re-measure within 2 hours to assess clearance. If >4 mmol/L = high-risk, trigger full bundle immediately.
Blood cultures ×2 (before antibiotics): Peripheral venepuncture + central line (if present). Do NOT delay antibiotics >45 minutes to obtain cultures.
Broad-spectrum IV antibiotics: Administer within 1 hour. In GCC, consider local resistance patterns (Gram-negative — E. coli, Klebsiella — often ESBL-positive). Use PKPD principles — optimal dosing, timing.
Crystalloid 30 ml/kg IV: If lactate ≥4 mmol/L OR hypotension (MAP <65 or SBP <90). Use Hartmann's or PlasmaLyte. Reassess after each bolus (250–500 ml). Stop if signs of fluid overload appear.
Vasopressors if MAP <65 after fluids: Noradrenaline (norepinephrine) is first-line vasopressor. Start at 0.01–0.05 mcg/kg/min, titrate to MAP ≥65 mmHg. Prefer central line; peripheral use only in emergency.
| Vasopressor | Mechanism | Role in Septic Shock | GCC Availability |
|---|---|---|---|
| Noradrenaline | α₁ > β₁ | FIRST-LINE — raises SVR | Universal |
| Vasopressin | V₁ receptor | Add-on (reduces noradrenaline dose) at 0.03 U/min | Major centres |
| Adrenaline | α₁ + β₁ + β₂ | Second-line if noradrenaline refractory | Universal |
| Dobutamine | β₁ > β₂ | Add if low CO / reduced EF (not primary vasopressor) | Universal |
Identify and control source of infection early: surgical drainage of abscesses, removal of infected lines/catheters, debridement of necrotising infection. Source control within 6–12 hours of diagnosis significantly improves outcomes.
Remove trigger: Stop offending drug/infusion, remove bee sting (scrape — do not squeeze), call for help.
Adrenaline (Epinephrine) 0.5 mg IM — FIRST AND MOST IMPORTANT DRUG: Inject into anterolateral thigh (mid-outer thigh) — fastest absorption. Can repeat every 5 minutes if no response. IM preferred over IV (IV can cause fatal arrhythmias if undiluted). Dose: 0.5 mg (0.5 ml of 1:1000) adult; 0.3 mg if 25–50 kg; 0.15 mg if <25 kg.
Positioning: Lay flat with legs elevated (or recovery position if vomiting). Do NOT sit patient up — causes sudden cardiovascular collapse. Pregnant patients: left lateral tilt.
Oxygen: High-flow 15 L/min via non-rebreather mask. Prepare for intubation if upper airway compromise.
IV access + fluids: Large-bore IV ×2, start IV fluid bolus 500–1000 ml Hartmann's if hypotensive.
H1 + H2 Antihistamines (adjunct — NOT primary treatment): Chlorphenamine 10 mg IV (H1) + Ranitidine 50 mg IV (H2). Help with urticaria/itch but do NOT reverse shock.
Hydrocortisone 200 mg IV (adjunct): Prevents biphasic reaction (2nd wave 4–12 hours later). Not immediately active — takes hours to work. Biphasic reactions occur in ~5% of cases.
Refractory anaphylaxis — Adrenaline infusion: If multiple IM adrenaline doses required, start adrenaline IV infusion 0.1–0.5 mcg/kg/min, titrate to response. Requires ICU/resus setting.
Caused by spinal cord injury at T6 or above (occasionally lower). Loss of sympathetic vasomotor tone below lesion causes vasodilation and bradycardia — the classic triad distinguishes it from other shock types.
Neurogenic shock: haemodynamic instability from autonomic disruption (a vasomotor problem).
Spinal shock: transient loss of all neurological function below injury level (flaccid paralysis, areflexia) — resolves over days to weeks. Both can coexist.
Shock caused by primary cardiac pump failure — inadequate cardiac output despite adequate filling pressures. Mortality 40–50% even with optimal management.
Treat the underlying cause urgently: For STEMI → emergency PCI (percutaneous coronary intervention) / thrombolysis if PCI not available within 120 min. Arrhythmia → cardioversion/pacing. Valve emergency → cardiac surgery. Time = myocardium.
Oxygen and airway support: High-flow O₂, prepare for intubation if respiratory failure. Avoid CPAP if tension/tamponade suspected.
Careful fluid assessment: Most cardiogenic shock patients are NOT fluid-depleted — aggressive fluids worsen pulmonary oedema. Give only if truly volume-depleted (dry PCWP). Small boluses 250 ml, reassess.
Vasopressors: Noradrenaline first-line to maintain MAP ≥65 mmHg. Add Dobutamine if severely reduced EF / low CO (inotropic support at 2.5–20 mcg/kg/min). Caution: dobutamine increases O₂ demand, may worsen ischaemia.
Mechanical Circulatory Support (MCS): If refractory despite vasopressors: IABP (Intra-Aortic Balloon Pump) — reduces afterload, augments diastolic perfusion; Impella (axial flow pump) — higher CO support; ECMO (VA-ECMO) — maximal support as bridge to recovery/transplant. Available at Cleveland Clinic Abu Dhabi, SKMC, HMC Doha.
Diuresis once stabilised: Once haemodynamically stable, use IV furosemide to treat congestion and reduce pulmonary oedema. Target negative fluid balance. Monitor electrolytes.
| Agent | Primary Effect | Use in Cardiogenic Shock |
|---|---|---|
| Noradrenaline | Vasoconstrictor (α₁) | Maintain MAP — first line |
| Dobutamine | Inotrope (β₁) | Increase CO if low EF — add-on |
| Dopamine | Mixed dose-dependent | Second-line; higher arrhythmia risk |
| Milrinone | PDE3 inhibitor (inotrope + vasodilator) | Careful use if MAP already low |
Caused by mechanical obstruction to blood flow — either inflow (filling) or outflow obstruction — reducing cardiac output despite adequate pump function and volume. Rapidly reversible if cause identified and treated promptly. The three critical causes: Tension Pneumothorax, Cardiac Tamponade, Massive PE.
Needle Decompression (immediate if haemodynamically unstable):
Option A: 2nd Intercostal Space, Midclavicular Line (2nd ICS MCL) — traditional. High failure rate in obese patients.
Option B: 4th/5th ICS, Anterior Axillary Line (4th/5th ICS AAL) — preferred by ATLS/TCCC. Lower failure rate, less chest wall thickness.
Use 14G IV cannula, perpendicular to chest wall, release of air confirms diagnosis.
Definitive: Chest Drain (Intercostal Drain — ICD): Insert after needle decompression. 5th ICS, midaxillary line. Connect to underwater seal drainage. Confirm placement with CXR.
Supportive: High-flow O₂, IV access, fluids cautiously, ECG monitoring. Do NOT intubate before decompression if tension pneumothorax suspected (PPV will worsen tension).
Approach: Subxiphoid (most common). Insert needle at 45° angle toward left shoulder, aspirate fluid. Aspiration of even 50 ml can dramatically improve haemodynamics. Connect to drainage catheter. Complications: myocardial puncture, pneumothorax, arrhythmia. Requires echo guidance in most centres. Surgical pericardial window if reaccumulation or haemopericardium from trauma.
PE causing sustained hypotension (SBP <90 mmHg for ≥15 min or requiring vasopressors), cardiac arrest, or new syncope. High-risk (massive) PE has 30-day mortality >50%.
Haemodynamically UNSTABLE PE → Systemic Thrombolysis (absolute indication): Alteplase 100 mg IV over 2 hours (or 0.6 mg/kg if cardiac arrest — max 50 mg as a rapid bolus). Hold anticoagulation during and 24 hours after lysis. Monitor for haemorrhagic complications.
Anticoagulation: LMWH or UFH immediately upon diagnosis if no contraindications. UFH preferred if thrombolysis planned (reversible with protamine). Start oral anticoagulation once stable.
Vasopressors: Noradrenaline for hypotension. Avoid aggressive fluid loading (worsens RV dilation and leftward septal shift — reduces LVCO).
Surgical embolectomy / catheter-directed thrombolysis: If systemic thrombolysis contraindicated or failed. Available at major GCC centres.
GCC (Gulf Cooperation Council: Saudi Arabia, UAE, Qatar, Bahrain, Kuwait, Oman) presents a unique epidemiological and healthcare landscape for shock management, shaped by climate, demographics, trauma patterns, and rapid healthcare expansion.
Summer temperatures in GCC regularly exceed 45–50°C with high humidity (coastal cities: Dubai, Abu Dhabi, Doha, Kuwait City). Heat stroke is a medical emergency and form of distributive shock with multi-organ involvement.
Activate trauma team / massive haemorrhage protocol immediately if mechanism and vital signs suggest Class III+ shock
Large-bore IV access ×2 and send group & cross-match urgently — activate MTP if ongoing haemorrhage
Control compressible external haemorrhage — tourniquet, wound packing, direct pressure
FAST ultrasound (haemoperitoneum, haemothorax, pericardial fluid, pneumothorax)
Maintain normothermia — blankets, fluid warmers — prevent lethal triad
Ensure adrenaline auto-injectors (EpiPens) and pre-drawn IM adrenaline 1:1000 are immediately available in all clinical areas. Anaphylaxis kits should be checked monthly. All GCC nurses must be trained in IM adrenaline injection technique.
A significant proportion of shock patients in GCC arrive at tertiary ICUs following inadequate initial resuscitation at primary/community hospitals. Contributing factors:
Nursing action: During retrieval/transfer, maintain resuscitation, document vital signs every 5–15 min, ensure IV access patent, bring blood products if MTP activated, communicate SBAR handover to receiving team before arrival.
Leading GCC centres utilise advanced haemodynamic monitoring for shock management. (For detailed parameters, see the Haemodynamic Monitoring Guide.)
| Technology | Principle | GCC Availability | Use in Shock |
|---|---|---|---|
| PiCCO (Pulse index Continuous Cardiac Output) | Transpulmonary thermodilution + pulse contour analysis | Cleveland Clinic, SKMC, HMC, KFSH | CO, SVR, preload assessment, EVLW (pulmonary oedema) |
| PA Catheter (Swan-Ganz) | Right heart catheterisation — direct PCWP, CO, mixed SvO₂ | Major tertiary centres | Cardiogenic vs distributive, PCWP, SVR |
| Impella Device | Percutaneous axial flow pump | Cleveland Clinic, SKMC | Cardiogenic shock — MCS bridge |
| VA-ECMO | Veno-Arterial extracorporeal membrane oxygenation | Cleveland Clinic, HMC | Refractory cardiogenic shock, cardiac arrest |
| POCUS (bedside echo) | Point-of-care ultrasound | All tertiary centres | FAST, cardiac function, IVC, tamponade, pneumothorax |
Enter heart rate and systolic blood pressure to calculate the Shock Index (HR ÷ SBP) and receive risk classification and initial management guidance.
Select shock type and severity to receive recommended fluid type, initial volume, and vasopressor indication threshold.
10 practice questions covering shock recognition, management and GCC-specific scenarios. Click an answer option to reveal instant feedback. Score tracked below.