Categories of shock

August 8, 2011 | By | Reply More

Categories of shock :

Hypovolaemic shock

Usually secondary to rapid blood loss

Cardiogenic shock

Usually due to acute myocardial infarction (MI) with at least 40% damage or death of left ventricle
Majority of patients have had previous MI with associated stenosis of all main coronary vessels

Septic shock

Divided into hyperdynamic (warm) and hypodynamic (cold) septic shock

Hyperdynamic shock is early; main physiological problem is impaired cell metabolism, preventing efficient oxygen utilisation to form adenosine triphosphate (ATP)

Hypodynamic shock occurs when sepsis persists without adequate fluid resuscitation

Increased capillary permeability occurs very early in septic shock

Fluid moves from intravascular to interstitial space, causing profound hypotension requiring aggressive fluid resuscitation

Anaphylactic shock

Usually history of initiating event

Penicillin is most common iatrogenic cause; bee and wasp stings and shellfish are other frequent causes Stridor, wheeze and swelling of mouth, tongue or around bite sites may be evident Due to immunoglobulin E (IgE) production, with subsequent release of histamine and slow-reacting substances of anaphylaxis

Neurogenic shock

Typically caused by blockade of sympathetic nervous system by trauma or
pharmacological agents

Produces vasodilation of arterioles in affected area and increased vascular capacity, with subsequent relative hypovolaemia and hypotension

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Category: Medical, Pathology, Surgery

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