1. Definition and pathophysiology
2. Stages of shock
3. Types of shock
   • Hypovolemic
   • Cardiogenic
   • Distributive: septic, anaphylactic, neurogenic
   • Obstructive
4. Clinical manifestations
5. Assessment and investigations
6. Emergency management and treatment
7. Nursing management and nursing diagnoses
8. Complications, prognosis, and patient education

1. Meaning, definition, and classification
2. Normal tissue perfusion and pathophysiology
3. Stages of shock
4. Hypovolemic shock
5. Cardiogenic shock
6. Distributive shock: septic, anaphylactic, and neurogenic shock
7. Obstructive shock
8. Clinical manifestations and diagnostic investigations
9. Emergency medical management
10. Detailed nursing assessment, nursing diagnoses, interventions, and evaluation
11. Complications, prevention, prognosis, and patient education
12. Short-answer, long-answer, and viva questions for revision

1. Concept of shock: definition, normal perfusion, causes, and pathophysiology
2. Stages of shock: initial, compensatory, progressive, and irreversible stages
3. Types of shock: hypovolemic, cardiogenic, septic, anaphylactic, neurogenic, and obstructive
4. Assessment: signs and symptoms, hemodynamic parameters, diagnostic tests
5. Medical and emergency management: ABCDE approach, fluids, blood products, oxygen, vasopressors, and treatment of the cause
6. Nursing management: assessment, monitoring, nursing diagnoses, interventions, evaluation, documentation, and patient/family support
7. Complications, prevention, and prognosis
8. Exam preparation: comparison table, short notes, long-answer outline, and viva questions

1. Definition and pathophysiology
2. Stages of shock
3. Types of shock
   • Hypovolemic
   • Cardiogenic
   • Distributive: septic, anaphylactic, neurogenic
   • Obstructive
4. Clinical manifestations
5. Assessment and investigations
6. Emergency management and treatment
7. Nursing management and nursing diagnoses
8. Complications, prognosis, and patient education

1. Meaning, definition, and classification
2. Normal tissue perfusion and pathophysiology
3. Stages of shock
4. Hypovolemic shock
5. Cardiogenic shock
6. Distributive shock: septic, anaphylactic, and neurogenic shock
7. Obstructive shock
8. Clinical manifestations and diagnostic investigations
9. Emergency medical management
10. Detailed nursing assessment, nursing diagnoses, interventions, and evaluation
11. Complications, prevention, prognosis, and patient education
12. Short-answer, long-answer, and viva questions for revision

1. Concept of shock: definition, normal perfusion, causes, and pathophysiology
2. Stages of shock: initial, compensatory, progressive, and irreversible stages
3. Types of shock: hypovolemic, cardiogenic, septic, anaphylactic, neurogenic, and obstructive
4. Assessment: signs and symptoms, hemodynamic parameters, diagnostic tests
5. Medical and emergency management: ABCDE approach, fluids, blood products, oxygen, vasopressors, and treatment of the cause
6. Nursing management: assessment, monitoring, nursing diagnoses, interventions, evaluation, documentation, and patient/family support
7. Complications, prevention, and prognosis
8. Exam preparation: comparison table, short notes, long-answer outline, and viva questions

Shock: Complete BSc Nursing Notes

1. Definition

Simple definition: Shock is acute circulatory failure causing inadequate tissue perfusion and cellular hypoxia.

2. Basic Concepts

Tissue perfusion

• Adequate circulating blood volume
• Effective cardiac pumping action
• Normal vascular tone and blood vessel patency
• Adequate oxygen-carrying capacity of blood, especially hemoglobin
• Proper cellular utilization of oxygen

Important formulae

• Cardiac output (CO) = Heart rate × Stroke volume
• Blood pressure = Cardiac output × Systemic vascular resistance
• Shock index = Heart rate ÷ Systolic blood pressure

3. Pathophysiology of Shock

Flow of events

Cellular changes

1. Inadequate oxygen prevents normal aerobic energy production.
2. Cells switch to anaerobic metabolism.
3. Lactic acid accumulates, causing metabolic acidosis.
4. Sodium-potassium pump fails, causing intracellular sodium and water accumulation.
5. Cells swell and may rupture.
6. Lysosomal enzymes are released, causing tissue destruction.
7. Endothelial injury causes capillary leakage, edema, inflammation, and microcirculatory failure.
8. Untreated shock may result in kidney failure, acute respiratory distress syndrome, disseminated intravascular coagulation, liver dysfunction, and multi-organ failure.

4. Classification of Shock

1. Hypovolemic shock
2. Cardiogenic shock
3. Distributive shock
   • Septic shock
   • Anaphylactic shock
   • Neurogenic shock
4. Obstructive shock

5. Stages of Shock

A. Initial stage

What happens?

• Tissue perfusion begins to decrease.
• Cells start anaerobic metabolism.
• Lactic acid begins to increase.
• Blood pressure may still remain normal.
• Signs may be subtle.

Nursing importance

B. Compensatory stage

Compensatory mechanisms

• Sympathetic nervous system stimulation
• Release of catecholamines: epinephrine and norepinephrine
• Tachycardia
• Peripheral vasoconstriction
• Increased respiratory rate
• Activation of renin-angiotensin-aldosterone system
• Retention of sodium and water by kidneys
• Increased antidiuretic hormone secretion

Signs and symptoms

• Anxiety, restlessness, fear
• Tachycardia
• Tachypnea
• Cool, pale, clammy skin
• Delayed capillary refill
• Decreased urine output
• Mild hypotension or normal blood pressure initially
• Narrow pulse pressure
• Thirst
• Weak peripheral pulses

A normal blood pressure does not exclude early shock.

C. Progressive stage

Features

• Worsening tissue hypoxia and metabolic acidosis
• Increased capillary permeability
• Fluid movement from vessels into tissues
• Myocardial depression
• Decreased cardiac output
• Poor renal perfusion
• Decreased cerebral perfusion

Signs and symptoms

• Hypotension
• Marked tachycardia, although some patients may have bradycardia
• Cold, mottled, cyanosed extremities in low-output shock
• Altered mental status: confusion, agitation, drowsiness
• Oliguria: urine output less than 0.5 mL/kg/hour
• Weak or absent peripheral pulses
• Rapid, shallow breathing
• Metabolic acidosis and rising serum lactate
• Abnormal ECG changes may occur

D. Refractory or irreversible stage

Features

• Severe hypotension
• Extreme alteration in consciousness or coma
• Anuria or severe oliguria
• Severe acidosis
• Cardiac dysrhythmias
• Respiratory failure
• Disseminated intravascular coagulation
• Multi-organ dysfunction syndrome
• Death may occur

6. Types of Shock

A. Hypovolemic Shock

Definition

Causes

Hemorrhagic causes

• Trauma and internal bleeding
• Gastrointestinal bleeding
• Postpartum hemorrhage
• Ruptured ectopic pregnancy
• Surgery
• Splenic rupture
• Ruptured aneurysm

Non-hemorrhagic causes

• Severe vomiting and diarrhea
• Severe dehydration
• Diabetic ketoacidosis
• Burns
• Excessive sweating
• Diuretic overuse
• Third-space fluid loss, such as pancreatitis or intestinal obstruction

Clinical features

• Tachycardia
• Hypotension
• Weak, thready pulse
• Cold, pale, clammy skin
• Delayed capillary refill
• Thirst
• Restlessness and anxiety
• Reduced urine output
• Flat neck veins
• Reduced central venous pressure
• Decreased hemoglobin and hematocrit in significant hemorrhage, although these may initially be normal in acute bleeding

Management

• Maintain airway and provide oxygen.
• Control external bleeding with direct pressure, dressing, or tourniquet where indicated.
• Insert two large-bore IV cannulas.
• Send blood for grouping, cross-matching, complete blood count, coagulation profile, electrolytes, arterial blood gas, and lactate.
• Give warmed isotonic crystalloid fluid according to clinical condition and protocol.
• Administer blood and blood products when hemorrhage is significant.
• Identify and control internal bleeding urgently.
• Keep patient warm.
• Monitor vital signs, urine output, mental status, lactate, and response to treatment.

B. Cardiogenic Shock

Definition

Causes

• Acute myocardial infarction
• Severe heart failure
• Cardiomyopathy
• Severe valvular heart disease
• Acute myocarditis
• Serious cardiac dysrhythmias
• Mechanical complications after myocardial infarction, such as papillary muscle rupture or ventricular septal rupture

Clinical features

• Hypotension
• Tachycardia or dysrhythmias
• Chest pain, especially in myocardial infarction
• Dyspnea and tachypnea
• Pulmonary edema: crackles, frothy sputum, hypoxia
• Cold, clammy, mottled skin
• Cyanosis
• Raised jugular venous pressure
• Weak peripheral pulses
• Oliguria
• Altered sensorium

Hemodynamic pattern

• Cardiac output: decreased
• Systemic vascular resistance: increased
• Central venous pressure: increased
• Pulmonary capillary wedge pressure: increased, especially with left ventricular failure

Management

• Maintain airway and provide oxygen. Assist ventilation if required.
• Obtain ECG and monitor continuously.
• Establish IV access and take blood samples.
• Give fluids cautiously because excess fluid can worsen pulmonary edema.
• Administer prescribed vasopressors or inotropes.
• Treat dysrhythmias.
• Treat the cause, such as urgent reperfusion for myocardial infarction.
• Prepare for advanced procedures, such as coronary intervention or mechanical circulatory support, if ordered.
• Monitor for pulmonary edema, renal failure, and worsening perfusion.

C. Distributive Shock

Definition

1. Septic Shock

Definition

Causes

• Pneumonia
• Urinary tract infection
• Abdominal infection
• Meningitis
• Infected wounds or burns
• Catheter-related infection
• Bloodstream infection

Pathophysiology

• Vasodilatation
• Capillary leakage
• Reduced systemic vascular resistance
• Maldistribution of blood flow
• Myocardial depression
• Microthrombi and coagulation abnormalities
• Cellular dysfunction

Clinical features

• Fever or hypothermia
• Warm, flushed skin
• Bounding pulse
• Tachycardia
• Tachypnea
• Hypotension
• Confusion
• Reduced urine output

• Cool, mottled skin
• Weak pulse
• Severe hypotension
• Cyanosis
• Oliguria or anuria
• Altered consciousness
• Multi-organ dysfunction

Management

• Recognize sepsis early and inform the medical team urgently.
• Obtain cultures, if this does not delay antimicrobial treatment.
• Start prescribed broad-spectrum antimicrobials urgently.
• Administer IV crystalloid fluid as prescribed and reassess frequently.
• Monitor serum lactate and response to resuscitation.
• Start vasopressors if hypotension persists after adequate fluid administration. Norepinephrine is commonly used as the first-line vasopressor in adult septic shock.
• Maintain a target mean arterial pressure commonly around 65 mmHg, individualized to the patient.
• Control the infection source, for example drainage of abscess or removal of infected line.
• Admit or transfer to ICU/HDU if needed.

2. Anaphylactic Shock

Definition

Common causes

• Medicines, especially antibiotics and analgesics
• Food, such as peanuts, shellfish, milk, or eggs
• Insect stings
• Latex
• Blood products
• Contrast media

Clinical features

• Sudden anxiety, itching, flushing, urticaria
• Swelling of face, lips, tongue, and throat
• Hoarseness, stridor, difficulty swallowing
• Wheeze, breathlessness, bronchospasm
• Hypotension, dizziness, collapse
• Tachycardia
• Abdominal cramps, vomiting, diarrhea
• Loss of consciousness in severe cases

Emergency management

1. Call for emergency help immediately.
2. Stop exposure to allergen, such as stopping an IV medication.
3. Assess airway, breathing, circulation, disability, and exposure.
4. Lay the patient flat with legs elevated if hypotensive. Do not allow sudden standing or walking.
5. Give high-flow oxygen.
6. Administer intramuscular adrenaline (epinephrine) promptly according to the local emergency protocol.
7. Establish IV access and give rapid IV fluid resuscitation as prescribed.
8. Prepare for airway support, intubation, and advanced resuscitation if needed.
9. Give additional prescribed treatment, such as antihistamines, bronchodilators, and corticosteroids. These do not replace adrenaline.
10. Observe the patient because biphasic reactions can occur.

3. Neurogenic Shock

Definition

Causes

• Acute spinal cord injury, especially cervical or upper thoracic injury
• Spinal anesthesia
• Severe brain injury in some cases

Clinical features

• Hypotension
• Bradycardia, unlike most other forms of shock
• Warm, dry skin
• Hypothermia due to inability to regulate temperature
• Weakness or paralysis below the level of injury
• Reduced venous return and reduced cardiac output

Management

• Maintain spinal immobilization.
• Ensure airway and adequate oxygenation.
• Give cautious IV fluids as ordered.
• Administer vasopressors as prescribed to restore vascular tone.
• Treat bradycardia according to protocol.
• Maintain normal body temperature.
• Monitor neurological status, cardiovascular status, and urine output.

D. Obstructive Shock

Definition

Causes

• Cardiac tamponade
• Massive pulmonary embolism
• Tension pneumothorax
• Severe pulmonary hypertension
• Rarely, obstruction due to tumor or severe valvular obstruction

Clinical features

• Hypotension
• Tachycardia
• Dyspnea
• Chest pain
• Raised jugular venous pressure
• Reduced oxygen saturation
• Weak pulses
• Altered mental status

Specific findings

Management

• Maintain airway and administer oxygen.
• Call emergency/critical care team.
• Establish IV access and monitor ECG.
• Use bedside ultrasound where available to help identify the cause.
• Treat the obstruction urgently:
  • Tension pneumothorax: immediate needle decompression followed by chest drain.
  • Cardiac tamponade: urgent pericardiocentesis or surgical drainage.
  • Massive pulmonary embolism: anticoagulation, thrombolysis, embolectomy, or other therapy as prescribed.

7. Comparison of Major Types of Shock

8. Clinical Manifestations of Shock

General signs and symptoms

Cardiovascular

• Tachycardia
• Hypotension
• Narrow pulse pressure
• Weak, thready pulse
• Delayed capillary refill
• Cold extremities in low-output shock
• Arrhythmias

Respiratory

• Tachypnea
• Dyspnea
• Low oxygen saturation
• Cyanosis
• Respiratory failure in severe shock

Neurological

• Restlessness
• Anxiety
• Confusion
• Agitation
• Drowsiness
• Reduced level of consciousness
• Coma in severe shock

Renal

• Oliguria
• Anuria
• Rising creatinine
• Acute kidney injury

Gastrointestinal

• Thirst
• Nausea and vomiting
• Reduced bowel sounds
• Ileus
• Stress ulceration in critically ill patients

Skin

• Pale, cool, clammy skin in hypovolemic and cardiogenic shock
• Warm, flushed skin in early septic shock
• Urticaria and angioedema in anaphylaxis
• Mottling and cyanosis in late shock

9. Assessment of a Patient With Shock

Primary assessment: ABCDE approach

A: Airway

• Is the airway open?
• Is there swelling, vomiting, blood, secretion, or foreign body?
• Is there stridor or inability to speak?

B: Breathing

• Respiratory rate, pattern, and effort
• Oxygen saturation
• Breath sounds
• Cyanosis
• Chest movement
• Arterial blood gas if indicated

C: Circulation

• Pulse rate, rhythm, volume
• Blood pressure and mean arterial pressure
• Capillary refill
• Skin temperature and color
• Presence of bleeding
• Jugular venous pressure
• Urine output
• ECG monitoring
• IV access

D: Disability

• Level of consciousness using AVPU or Glasgow Coma Scale
• Pupillary response
• Blood glucose
• Pain assessment

E: Exposure

• Inspect for trauma, bleeding, rash, infection, burns, edema, surgical wounds, and pressure injuries.
• Prevent heat loss.

Important investigations

• Complete blood count
• Blood grouping and cross-match
• Blood glucose
• Serum electrolytes
• Urea and creatinine
• Liver function tests
• Coagulation profile
• Serum lactate
• Arterial blood gas
• Blood cultures and other cultures if infection is suspected
• ECG
• Chest X-ray
• Echocardiography or point-of-care ultrasound
• CT scan or other imaging when the patient is stable enough

Important monitoring parameters

• Heart rate and rhythm
• Blood pressure, including mean arterial pressure
• Respiratory rate and oxygen saturation
• Temperature
• Neurological status
• Urine output
• Peripheral perfusion and capillary refill
• Lactate trend
• Intake and output
• Central venous pressure or arterial pressure, if invasive monitoring is used

10. General Emergency Management of Shock

Immediate priorities

1. Recognize shock early.
2. Call for assistance and notify the medical/emergency team.
3. Assess and manage ABCDE.
4. Position the patient appropriately.
   • Usually supine.
   • Elevate legs if appropriate in hypovolemia.
   • Avoid leg elevation if contraindicated, such as severe pulmonary edema.
5. Maintain airway.
6. Give oxygen as prescribed or according to emergency protocol.
7. Insert two large-bore IV cannulas.
8. Collect blood samples.
9. Begin fluid resuscitation if indicated.
10. Control bleeding or treat the specific cause.
11. Monitor continuously and reassess after every intervention.
12. Keep the patient warm, but do not overheat.
13. Insert urinary catheter if ordered to monitor hourly urine output.
14. Prepare for ICU/HDU transfer if unstable.

11. Fluid and Drug Management: Nursing Points

Fluid resuscitation

Crystalloids

Blood products

Key nursing responsibilities

• Check prescription and patient identity.
• Use aseptic technique.
• Assess for fluid overload, especially in cardiac or renal disease.
• Monitor respiratory status, lung sounds, edema, and oxygen saturation.
• During transfusion, observe for fever, chills, rash, breathlessness, hypotension, back pain, and hemoglobinuria.
• Stop transfusion and follow institutional protocol if a transfusion reaction is suspected.

Vasopressors and inotropes

• Norepinephrine
• Epinephrine
• Vasopressin
• Dobutamine

Nursing responsibilities

• Administer through a controlled infusion pump.
• Prefer central venous access when available, according to institutional policy.
• Monitor blood pressure frequently or continuously.
• Observe for arrhythmias, chest pain, reduced peripheral circulation, and extravasation.
• Titrate only according to prescribed order or approved protocol.
• Never discontinue suddenly unless instructed.

12. Nursing Management of Patient With Shock

Nursing assessment

• Cause and onset of symptoms
• Vital signs and trends
• Skin color, temperature, and capillary refill
• Mental status
• Respiratory effort and oxygen saturation
• Pain
• Presence and amount of bleeding
• Urine output
• Intake and output
• IV fluids, medications, and response
• Laboratory values, especially lactate, hemoglobin, arterial blood gas, electrolytes, and renal function
• Family concerns and understanding

Common Nursing Diagnoses

1. Ineffective tissue perfusion related to decreased circulating volume, decreased cardiac output, vasodilatation, or vascular obstruction.
2. Decreased cardiac output related to impaired myocardial contractility or altered preload/afterload.
3. Impaired gas exchange related to pulmonary edema, acute lung injury, bronchospasm, or decreased oxygen delivery.
4. Deficient fluid volume related to hemorrhage, vomiting, diarrhea, burns, or third-space fluid loss.
5. Risk for impaired skin integrity related to reduced tissue perfusion and immobility.
6. Acute confusion related to cerebral hypoperfusion.
7. Anxiety related to breathlessness, pain, fear, and critical illness.
8. Risk for hypothermia related to exposure, fluid administration, blood loss, or impaired thermoregulation.

Nursing Interventions With Rationale

1. Maintain airway and oxygenation

• Keep airway patent.
• Position appropriately.
• Administer oxygen as prescribed.
• Monitor oxygen saturation and respiratory effort.
• Prepare suction, bag-mask device, and advanced airway equipment if deterioration occurs.

2. Monitor vital signs frequently

• Measure pulse, BP, respiratory rate, temperature, oxygen saturation, and level of consciousness frequently.
• Use continuous ECG monitoring in unstable patients.
• Assess trends, not only single readings.

3. Maintain adequate circulation

• Ensure IV access remains patent.
• Administer fluids, blood products, vasopressors, and other drugs as prescribed.
• Monitor for adverse effects.
• Monitor peripheral perfusion, capillary refill, skin temperature, and pulse quality.

4. Monitor urine output

• Insert urinary catheter if ordered.
• Measure hourly urine output accurately.
• Report urine output less than 0.5 mL/kg/hour or a sudden decrease.

5. Prevent hypothermia

• Cover the patient with warm blankets.
• Use fluid/blood warmers where indicated.
• Monitor body temperature.
• Avoid unnecessary exposure.

6. Control bleeding

• Apply direct pressure to visible bleeding.
• Reinforce dressing if bleeding continues and report promptly.
• Measure drainage from wounds, drains, and suction devices.
• Prepare patient for surgery, endoscopy, interventional radiology, or transfusion as ordered.

7. Reduce anxiety and provide psychological support

• Stay with the patient when possible.
• Speak calmly and explain procedures briefly.
• Reassure without giving false assurance.
• Involve family appropriately, according to policy.

8. Protect skin and prevent complications of immobility

• Reposition as tolerated by hemodynamic status.
• Inspect pressure areas.
• Keep skin clean and dry.
• Use pressure-relieving measures.

9. Maintain strict asepsis

• Perform hand hygiene.
• Use aseptic technique for IV lines, catheters, dressings, and invasive procedures.
• Assess lines and wounds for signs of infection.

10. Accurate documentation

• Time of onset and changes in patient condition
• Vital-sign trends
• Urine output
• Oxygen therapy
• IV fluid type and amount
• Blood products
• Drugs and infusion rates
• Procedures performed
• Laboratory values
• Communication with doctor/emergency team
• Patient response to treatment

13. Evaluation of Nursing Care

• Improved level of consciousness
• Stable or improving blood pressure and mean arterial pressure
• Improved pulse quality and reduced tachycardia
• Warm, pink skin with improved capillary refill
• Oxygen saturation within prescribed target
• Urine output at least 0.5 mL/kg/hour in most adults
• Falling serum lactate
• Improved arterial blood gas values
• Reduced anxiety and improved comfort
• Absence of new organ dysfunction

14. Complications of Shock

• Acute kidney injury
• Acute respiratory distress syndrome
• Respiratory failure
• Disseminated intravascular coagulation
• Myocardial ischemia and dysrhythmias
• Liver dysfunction
• Ischemic bowel
• Pressure injuries
• Peripheral ischemia and gangrene
• Multiple organ dysfunction syndrome
• Cardiac arrest
• Death

15. Prevention

• Early recognition and treatment of infection
• Timely treatment of dehydration, diarrhea, and vomiting
• Prompt control of bleeding
• Safe blood transfusion practice
• Monitoring postoperative patients for bleeding and sepsis
• Prevention of hospital-acquired infections
• Allergy history and clear documentation of known allergens
• Early treatment of myocardial infarction and heart failure
• Safe spinal injury management
• Patient education about warning symptoms requiring urgent care

16. Patient and Family Education

• Severe bleeding
• Chest pain, severe breathlessness, fainting, or palpitations
• High fever, confusion, reduced urine output, or severe weakness
• Persistent vomiting or diarrhea with dizziness
• Symptoms of severe allergy: swelling of lips/tongue, wheeze, faintness, widespread rash
• Signs of worsening infection in wounds, surgical sites, catheters, or burns

• Avoid the known allergen.
• Wear allergy identification.
• Keep prescribed adrenaline auto-injector available, if advised.
• Teach correct use of the auto-injector and the need to seek emergency care after use.

17. Short Note: Shock Management in One Line

18. Long-Answer Exam Outline

“Define shock. Explain its types and nursing management.”

1. Definition
2. Pathophysiology
3. Stages of shock
4. Classification
5. Brief explanation of each type
6. Signs and symptoms
7. Investigations
8. Emergency medical management
9. Nursing assessment
10. Nursing diagnoses
11. Nursing interventions with rationale
12. Complications and prevention
13. Conclusion: early recognition and cause-specific treatment reduce mortality.

19. Important Viva Questions

1. Define shock.
2. What is the difference between hypovolemic and cardiogenic shock?
3. Why is urine output monitored in shock?
4. What is the normal target urine output in an adult?
5. Why does lactic acidosis occur in shock?
6. Which type of shock commonly causes bradycardia?
7. Which type of shock causes warm, flushed skin in the early stage?
8. What is the first-line emergency drug in anaphylaxis?
9. What are the common causes of obstructive shock?
10. Why should fluids be given cautiously in cardiogenic shock?
11. What is the importance of serum lactate?
12. What are the signs of worsening tissue perfusion?
13. What is the role of norepinephrine in septic shock?
14. What are the common complications of prolonged shock?
15. What are the nursing priorities in a patient with shock?