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Shock Pathophysiology Types and Emergency Management Guide
Learn the complete pathophysiology of shock, its major types including hypovolemic, cardiogenic, septic, obstructive and neurogenic shock, along with detailed clinical features and stepwise emergency management for medical exams and practice.
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Frequently Asked Questions
❓ What is shock in medical terms?
Shock is a life-threatening condition where tissue perfusion and oxygen delivery are inadequate, leading to cellular hypoxia, metabolic acidosis, and organ dysfunction.
❓ What is the main pathophysiology of shock?
Shock occurs due to failure of oxygen delivery to tissues, causing anaerobic metabolism, lactic acidosis, ATP depletion, inflammatory mediator release, microcirculatory dysfunction, and eventually multi-organ failure.
❓ What are the major types of shock?
The major types of shock are hypovolemic shock, cardiogenic shock, distributive shock (septic, anaphylactic, neurogenic), and obstructive shock.
❓ What causes hypovolemic shock?
Hypovolemic shock is caused by severe loss of intravascular volume due to hemorrhage, dehydration, burns, vomiting, diarrhea, or plasma loss.
❓ What is the mechanism of cardiogenic shock?
Cardiogenic shock results from pump failure of the heart, leading to reduced cardiac output despite adequate volume, commonly due to myocardial infarction, arrhythmias, myocarditis, or severe heart failure.
❓ Why does septic shock cause low blood pressure?
Septic shock causes systemic vasodilation due to cytokine and nitric oxide release, along with capillary leak and myocardial depression, resulting in reduced systemic vascular resistance and hypotension.
❓ What is the hallmark feature of neurogenic shock?
Neurogenic shock is characterized by hypotension with bradycardia and warm dry skin due to loss of sympathetic tone, usually after spinal cord injury.
❓ What are common causes of obstructive shock?
Obstructive shock is caused by mechanical obstruction to blood flow, such as pulmonary embolism, cardiac tamponade, or tension pneumothorax.
❓ What are the early clinical signs of shock?
Early signs include tachycardia, anxiety, cold extremities, delayed capillary refill, mild hypotension or normal blood pressure, and reduced urine output.
❓ What laboratory finding is most important in shock assessment?
Elevated serum lactate is a key marker of tissue hypoperfusion and anaerobic metabolism in shock.
❓ What is the first step in shock management?
The first step is immediate ABCDE resuscitation: secure airway, provide high-flow oxygen, establish IV access, start fluid resuscitation, and treat the underlying cause.
❓ Which fluid is first-line for initial shock resuscitation?
Crystalloids such as normal saline or Ringer lactate are first-line for initial fluid resuscitation in most shock types.
❓ What is the first-line vasopressor in septic shock?
Norepinephrine is the first-line vasopressor used in septic shock to maintain mean arterial pressure above 65 mmHg.
❓ What is the immediate treatment for anaphylactic shock?
Immediate intramuscular epinephrine is the life-saving first-line treatment for anaphylactic shock, followed by airway support and adjunct therapies.
❓ How is cardiogenic shock managed differently from hypovolemic shock?
Cardiogenic shock requires inotropes and revascularization, and excessive fluids are avoided due to risk of pulmonary edema, whereas hypovolemic shock requires aggressive fluid and blood replacement.
❓ What are the stages of shock progression?
Shock progresses through compensated stage (tachycardia, vasoconstriction), progressive stage (hypotension, organ dysfunction), and irreversible stage (refractory multi-organ failure).
❓ What are key endpoints to monitor during shock treatment?
Key endpoints include MAP ≥65 mmHg, urine output ≥0.5 mL/kg/hr, improving mental status, lactate clearance, and normalization of perfusion signs.
❓ What is the most dangerous complication of untreated shock?
Untreated shock can lead to multi-organ failure, disseminated intravascular coagulation, ARDS, irreversible tissue damage, and death.