{"id":5661,"date":"2025-12-13T17:00:33","date_gmt":"2025-12-13T22:00:33","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/?post_type=chapter&#038;p=5661"},"modified":"2025-12-13T17:53:48","modified_gmt":"2025-12-13T22:53:48","slug":"types-of-shock","status":"web-only","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/chapter\/types-of-shock\/","title":{"raw":"7p29  Types of Shock","rendered":"7p29  Types of Shock"},"content":{"raw":"<strong>Shock \u2013 Types, Causes, Signs, and Treatments<\/strong>\r\n<h1><strong> Types of Shock:<\/strong><\/h1>\r\n<h1><strong>1.\u00a0 Hypovolemic Shock:<\/strong><\/h1>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Definition:<\/strong>\u00a0Low blood volume (hypo-volemic).<\/li>\r\n \t<li><strong>Causes:<\/strong>\r\n<ul>\r\n \t<li>Blood loss due to hemorrhage.<\/li>\r\n \t<li>Fluid loss from severe burns or extensive inflammation.<\/li>\r\n \t<li>Fluid shift into interstitial spaces (edema) during inflammation, burns, or peritonitis.<\/li>\r\n \t<li>Dehydration, especially in athletes during heat exposure or lack of acclimatization.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Mechanism:<\/strong>\r\n<ul>\r\n \t<li>Reduced blood volume decreases\u00a0<strong>preload<\/strong>.<\/li>\r\n \t<li>Leads to\u00a0<strong>poor cardiac output<\/strong>.<\/li>\r\n \t<li>Heart compensates by increasing\u00a0<strong>sympathetic activity<\/strong>, causing vasoconstriction and raising blood pressure.\u00a0 Eventually not able to fully compensate and....<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Effects:<\/strong>\r\n<ul>\r\n \t<li>Organs receive insufficient oxygen and nutrients.<\/li>\r\n \t<li>If untreated, causes\u00a0<strong>organ failure<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Treatment:<\/strong>\r\n<ul>\r\n \t<li>Restoring blood volume via IV fluids or blood transfusions.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>2.\u00a0 Cardiogenic Shock:<\/strong><\/h1>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Cause:<\/strong>\u00a0Heart's\u00a0<strong>muscle dysfunction<\/strong>.<\/li>\r\n \t<li><strong>Common causes:<\/strong>\r\n<ul>\r\n \t<li><strong>Myocardial infarction<\/strong>\u00a0(heart attack).<\/li>\r\n \t<li><strong>Arrhythmias<\/strong>\u00a0that impair contraction.<\/li>\r\n \t<li><strong>Valvular damage<\/strong><\/li>\r\n \t<li><strong>Dissected aorta<\/strong><\/li>\r\n \t<li><strong>Cardiac tamponade<\/strong>\u00a0(fluid in pericardium compressing the heart).<\/li>\r\n \t<li><strong>Poor ventricular filling<\/strong>\u00a0(e.g., severe heart damage).<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Impact:<\/strong>\r\n<ul>\r\n \t<li>The weakened heart cannot pump blood effectively, leading to <strong>decreased stroke volume<\/strong>, <strong>low cardiac output<\/strong>\u00a0and\u00a0<strong>organ hypoperfusion<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Treatment:<\/strong>\r\n<ul>\r\n \t<li>Address underlying causes (e.g., revascularization, arrhythmia control).<\/li>\r\n \t<li>Supportive therapies to boost cardiac function.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>3.\u00a0 Obstructive Shock:<\/strong><\/h1>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Cause:<\/strong>\u00a0Physical obstruction in blood flow.<\/li>\r\n \t<li><strong>Examples:<\/strong>\r\n<ul>\r\n \t<li><strong>Pulmonary embolism<\/strong>\u00a0(blockage in lungs).<\/li>\r\n \t<li><strong>Cardiac tamponade<\/strong>\u00a0(fluid compresses the heart).<\/li>\r\n \t<li>Severe\u00a0<strong>aortic or pulmonary artery stenosis<\/strong> (narrowing).<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Impact:<\/strong>\r\n<ul>\r\n \t<li>Limit blood flow into or out of the heart.<\/li>\r\n \t<li>Reduce cardiac output and tissue perfusion.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Treatment:<\/strong>\r\n<ul>\r\n \t<li>Remove or bypass the obstruction (e.g., pericardiocentesis, thrombolysis).<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>4.\u00a0 Vasogenic (Distributive) Shock:<\/strong><\/h1>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Cause:<\/strong>\u00a0Excessive vasodilation causing severe hypotension.<\/li>\r\n \t<li><strong>Types:<\/strong>\r\n<ul>\r\n \t<li><strong>Anaphylactic shock:<\/strong> Allergic reaction with massive histamine release causing vasodilation.<\/li>\r\n \t<li><strong>Septic shock:<\/strong>\u00a0Infection triggers widespread inflammation and vasodilation.<\/li>\r\n \t<li><strong>Neurogenic shock:<\/strong> Neuronal impairment (e.g., spinal cord injury) reduces sympathetic tone on blood vessels, and blood vessel dilate.<\/li>\r\n \t<li><strong>Diabetic shock (hypoglycemia):<\/strong> Severe hypoglycemia causes nervous system failure, resulting in reduced sympathetic tone on blood vessels and vasodilation.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Effects:<\/strong>\r\n<ul>\r\n \t<li><strong>No pressure or flow<\/strong>\u00a0to tissues, organs become hypoxic.<\/li>\r\n \t<li><strong>Brain and neurons<\/strong>\u00a0suffer from lack of oxygen, leading to\u00a0<strong>dizziness<\/strong>,\u00a0<strong>confusion<\/strong>,\u00a0<strong>loss of consciousness<\/strong>,\u00a0<strong>brain death<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Signs:<\/strong>\r\n<ul>\r\n \t<li>Weak, rapid pulse.<\/li>\r\n \t<li>Anxiety, restlessness, tachycardia.<\/li>\r\n \t<li>Cool, clammy skin (except in sepsis, where fever may be present).<\/li>\r\n \t<li>Confusion, dizziness<\/li>\r\n \t<li><strong>Organ dysfunction<\/strong> (including kidney failure, liver damage and signs of brain hypoxia).<\/li>\r\n \t<li><strong>Signs of hypoxia:<\/strong>\u00a0headache, fatigue, decreased responsiveness, coma.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Treatment:<\/strong>\r\n<ul>\r\n \t<li>Epinephrine in anaphylactic shock.<\/li>\r\n \t<li>Antibiotics in septic shock.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>Signs and Symptoms:<\/strong><\/h1>\r\n<ul>\r\n \t<li>Early:\u00a0<strong>Anxiety, restlessness, tachycardia<\/strong>.<\/li>\r\n \t<li>Progression:\r\n<ul>\r\n \t<li><strong>Hypotension<\/strong>\u00a0(low blood pressure).<\/li>\r\n \t<li><strong>Cold, clammy skin<\/strong>\u00a0due to vasoconstriction.<\/li>\r\n \t<li><strong>Decreased urine output<\/strong>.<\/li>\r\n \t<li><strong>Weak or rapid pulse<\/strong>.<\/li>\r\n \t<li><strong>Confusion, dizziness, weakness, fatigue<\/strong>.<\/li>\r\n \t<li><strong>Organ failure<\/strong> (kidneys, liver, lungs, brain) in late stages.<\/li>\r\n \t<li><strong style=\"text-align: initial;font-size: 1em\">Signs of hypoxia<\/strong><span style=\"text-align: initial;font-size: 1em\">, acidosis, and cell death.<\/span><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>Organ Damage &amp; Fatal Outcomes:<\/strong><\/h1>\r\n<ul>\r\n \t<li>Sluggish blood flow leads to\u00a0<strong>clots<\/strong>.<\/li>\r\n \t<li>Emboli can cause\u00a0<strong>organ infarction<\/strong>\u00a0(brain, kidney, lungs).<\/li>\r\n \t<li><strong>Metabolic acidosis<\/strong>\u00a0occurs from anaerobic respiration and lactic acid buildup.<\/li>\r\n \t<li><strong>Kidney failure:<\/strong>\u00a0due to ischemia and necrosis, with accumulation of waste products (urea, creatinine).<\/li>\r\n<\/ul>\r\n<strong>All these effects<\/strong>\u00a0can lead to\u00a0<strong>multi-organ failure<\/strong>\u00a0and\u00a0<strong>death<\/strong>\u00a0if untreated.\r\n<h1>Body's Compensations Mechanisms:<\/h1>\r\n<ul>\r\n \t<li><strong>Neural (sympathetic):<\/strong>\r\n<ul>\r\n \t<li>Increased heart rate.<\/li>\r\n \t<li>Venoconstriction to maintain preload.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Endocrine:<\/strong>\r\n<ul>\r\n \t<li><strong>Renin-angiotensin-aldosterone system (RAAAS):<\/strong>\r\n<ul>\r\n \t<li>Kidneys secrete\u00a0<strong>renin<\/strong> \u2192 angiotensin II causes vasoconstriction and stimulates aldosterone and ADH secretion.<\/li>\r\n \t<li>Aldosterone and ADH retains salt and water, increasing blood volume.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Antidiuretic hormone (ADH):<\/strong>\u00a0increases water reabsorption.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<strong>Effects:<\/strong>\u00a0Maintain blood pressure initially but worsens fluid overload if prolonged.\r\n<h1><strong>Treatment Strategies and Emergency Response:<\/strong><\/h1>\r\n<ol>\r\n \t<li><strong>Hypovolemic Shock:<\/strong>\r\n<ul>\r\n \t<li>Stop bleeding if present.<\/li>\r\n \t<li>Restore blood volume with\u00a0<strong>IV fluids<\/strong>\u00a0or\u00a0<strong>blood transfusions<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Anaphylactic Shock:<\/strong>\r\n<ul>\r\n \t<li>Administer\u00a0<strong>epinephrine<\/strong>\u00a0(epi-pen).<\/li>\r\n \t<li>Give\u00a0<strong>antihistamines<\/strong>\u00a0and\u00a0<strong>anti-inflammatories<\/strong>.<\/li>\r\n \t<li>Maintain\u00a0<strong>airway<\/strong>\u00a0and provide\u00a0<strong>oxygen<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Septic Shock:<\/strong>\r\n<ul>\r\n \t<li>Treat underlying\u00a0<strong>infection<\/strong>\u00a0with antibiotics.<\/li>\r\n \t<li>Use\u00a0<strong>vasoconstrictors<\/strong>\u00a0if blood vessels are dilated excessively.<\/li>\r\n \t<li>Provide\u00a0<strong>oxygen<\/strong>\u00a0and supportive care.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Other supportive measures:<\/strong>\r\n<ul>\r\n \t<li><strong>Oxygen therapy<\/strong>\u00a0to maximize oxygen delivery.<\/li>\r\n \t<li><strong>Vasoactive drugs<\/strong> to restore blood pressure in vasodilatory shock (e.g., vasocontrictors such as epinephrine).<\/li>\r\n \t<li>Keep patient\u00a0<strong>comfortable<\/strong>\u00a0and monitor vital signs.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ol>\r\n<strong>Emergency Response:<\/strong>\r\n<ul>\r\n \t<li>Call\u00a0<strong>911<\/strong>\u00a0immediately.<\/li>\r\n \t<li>Control bleeding and hypoxia.<\/li>\r\n \t<li>Provide <strong style=\"text-align: initial;font-size: 1em\">fluids<\/strong><span style=\"text-align: initial;font-size: 1em\">,\u00a0<\/span><strong style=\"text-align: initial;font-size: 1em\">medications<\/strong><span style=\"text-align: initial;font-size: 1em\">, and\u00a0<\/span><strong style=\"text-align: initial;font-size: 1em\">airway management<\/strong><span style=\"text-align: initial;font-size: 1em\"> as needed.<\/span><\/li>\r\n \t<li>Can be fatal if not treated.<\/li>\r\n \t<li style=\"list-style-type: none\"><\/li>\r\n<\/ul>\r\n<h1><strong>Summary:<\/strong><\/h1>\r\nShock involves inadequate blood flow from various causes: volume loss (hypovolemic), heart failure (cardiogenic), obstructions (obstructive), or abnormal vessel dilation (vasogenic). Treatment centers on restoring blood volume, removing obstructions, and reversing vasodilation, depending on the type. Early recognition and intervention are crucial to prevent organ failure and death.\r\n\r\n&nbsp;\r\n\r\nShock is a life-threatening condition caused by various mechanisms disrupting blood flow and oxygen delivery. Early recognition, resuscitation, and targeted treatment of the underlying cause are critical to prevent organ failure and death. Proper supportive care, including oxygen and fluids, is essential in managing all types of shock.\r\n<h1>Summary Table:<\/h1>\r\n<table class=\"grid landscape\" style=\"height: 366px\">\r\n<tbody>\r\n<tr style=\"height: 30px\">\r\n<td style=\"height: 30px;width: 146.494px\"><strong>Type<\/strong><\/td>\r\n<td style=\"height: 30px;width: 226.2px\"><strong>Mechanism<\/strong><\/td>\r\n<td style=\"height: 30px;width: 347.306px\"><strong>Specific Cause<\/strong><\/td>\r\n<\/tr>\r\n<tr style=\"height: 61px\">\r\n<td style=\"height: 61px;width: 146.494px\">Hypovolemic<\/td>\r\n<td style=\"height: 61px;width: 226.2px\">Loss of blood or plasma<\/td>\r\n<td style=\"height: 61px;width: 347.306px\">Hemorrhage, burns (fluid shift &amp; edema), dehydration, peritonitis (fluid shift \u2192 third-spacing), pancreatitis<\/td>\r\n<\/tr>\r\n<tr style=\"height: 46px\">\r\n<td style=\"height: 46px;width: 146.494px\">Cardiogenic<\/td>\r\n<td style=\"height: 46px;width: 226.2px\">Decreased pumping capability of the heart<\/td>\r\n<td style=\"height: 46px;width: 347.306px\">Myocardial infarction of left ventricle, cardiac arrhythmia, <em>pulmonary embolus, cardiac tamponade<\/em><\/td>\r\n<\/tr>\r\n<tr style=\"height: 46px\">\r\n<td style=\"height: 46px;width: 146.494px\">Obstructive<\/td>\r\n<td style=\"height: 46px;width: 226.2px\">Interference with blood flow through the heart<\/td>\r\n<td style=\"height: 46px;width: 347.306px\">Cardiac tamponade or pulmonary embolus<\/td>\r\n<\/tr>\r\n<tr style=\"height: 61px\">\r\n<td style=\"height: 61px;width: 146.494px\">Vasogenic (neurogenic or *distributive)<\/td>\r\n<td style=\"height: 61px;width: 226.2px\">Vasodilation owing to\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 loss of sympathetic &amp; vasomotor tone<\/td>\r\n<td style=\"height: 61px;width: 347.306px\">Pain and fear, spinal cord injury (loss of SNS), hypoglycemia (insulin shock)<\/td>\r\n<\/tr>\r\n<tr style=\"height: 61px\">\r\n<td style=\"height: 61px;width: 146.494px\">Anaphylactic*<\/td>\r\n<td style=\"height: 61px;width: 226.2px\">Systemic vasodilation &amp; increased permeability owing to severe allergic reaction<\/td>\r\n<td style=\"height: 61px;width: 347.306px\">Insect stings, drugs, nuts, shellfish stimulating mast cells to release massive amounts of histamine<\/td>\r\n<\/tr>\r\n<tr style=\"height: 61px\">\r\n<td style=\"height: 61px;width: 146.494px\">Septic* (endotoxic)<\/td>\r\n<td style=\"height: 61px;width: 226.2px\">Vasodilation owing to severe infection, often with gram-negative bacteria<\/td>\r\n<td style=\"height: 61px;width: 347.306px\">Virulent microorganisms (gram-negative bacteria) or multiple infections cause APCs to release massive cytokines\u2192\u2191NO\u2192\u2191 vasodilation<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n&nbsp;","rendered":"<p><strong>Shock \u2013 Types, Causes, Signs, and Treatments<\/strong><\/p>\n<h1><strong> Types of Shock:<\/strong><\/h1>\n<h1><strong>1.\u00a0 Hypovolemic Shock:<\/strong><\/h1>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Definition:<\/strong>\u00a0Low blood volume (hypo-volemic).<\/li>\n<li><strong>Causes:<\/strong>\n<ul>\n<li>Blood loss due to hemorrhage.<\/li>\n<li>Fluid loss from severe burns or extensive inflammation.<\/li>\n<li>Fluid shift into interstitial spaces (edema) during inflammation, burns, or peritonitis.<\/li>\n<li>Dehydration, especially in athletes during heat exposure or lack of acclimatization.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Mechanism:<\/strong>\n<ul>\n<li>Reduced blood volume decreases\u00a0<strong>preload<\/strong>.<\/li>\n<li>Leads to\u00a0<strong>poor cardiac output<\/strong>.<\/li>\n<li>Heart compensates by increasing\u00a0<strong>sympathetic activity<\/strong>, causing vasoconstriction and raising blood pressure.\u00a0 Eventually not able to fully compensate and&#8230;.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Effects:<\/strong>\n<ul>\n<li>Organs receive insufficient oxygen and nutrients.<\/li>\n<li>If untreated, causes\u00a0<strong>organ failure<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Treatment:<\/strong>\n<ul>\n<li>Restoring blood volume via IV fluids or blood transfusions.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>2.\u00a0 Cardiogenic Shock:<\/strong><\/h1>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Cause:<\/strong>\u00a0Heart&#8217;s\u00a0<strong>muscle dysfunction<\/strong>.<\/li>\n<li><strong>Common causes:<\/strong>\n<ul>\n<li><strong>Myocardial infarction<\/strong>\u00a0(heart attack).<\/li>\n<li><strong>Arrhythmias<\/strong>\u00a0that impair contraction.<\/li>\n<li><strong>Valvular damage<\/strong><\/li>\n<li><strong>Dissected aorta<\/strong><\/li>\n<li><strong>Cardiac tamponade<\/strong>\u00a0(fluid in pericardium compressing the heart).<\/li>\n<li><strong>Poor ventricular filling<\/strong>\u00a0(e.g., severe heart damage).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Impact:<\/strong>\n<ul>\n<li>The weakened heart cannot pump blood effectively, leading to <strong>decreased stroke volume<\/strong>, <strong>low cardiac output<\/strong>\u00a0and\u00a0<strong>organ hypoperfusion<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Treatment:<\/strong>\n<ul>\n<li>Address underlying causes (e.g., revascularization, arrhythmia control).<\/li>\n<li>Supportive therapies to boost cardiac function.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>3.\u00a0 Obstructive Shock:<\/strong><\/h1>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Cause:<\/strong>\u00a0Physical obstruction in blood flow.<\/li>\n<li><strong>Examples:<\/strong>\n<ul>\n<li><strong>Pulmonary embolism<\/strong>\u00a0(blockage in lungs).<\/li>\n<li><strong>Cardiac tamponade<\/strong>\u00a0(fluid compresses the heart).<\/li>\n<li>Severe\u00a0<strong>aortic or pulmonary artery stenosis<\/strong> (narrowing).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Impact:<\/strong>\n<ul>\n<li>Limit blood flow into or out of the heart.<\/li>\n<li>Reduce cardiac output and tissue perfusion.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Treatment:<\/strong>\n<ul>\n<li>Remove or bypass the obstruction (e.g., pericardiocentesis, thrombolysis).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>4.\u00a0 Vasogenic (Distributive) Shock:<\/strong><\/h1>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Cause:<\/strong>\u00a0Excessive vasodilation causing severe hypotension.<\/li>\n<li><strong>Types:<\/strong>\n<ul>\n<li><strong>Anaphylactic shock:<\/strong> Allergic reaction with massive histamine release causing vasodilation.<\/li>\n<li><strong>Septic shock:<\/strong>\u00a0Infection triggers widespread inflammation and vasodilation.<\/li>\n<li><strong>Neurogenic shock:<\/strong> Neuronal impairment (e.g., spinal cord injury) reduces sympathetic tone on blood vessels, and blood vessel dilate.<\/li>\n<li><strong>Diabetic shock (hypoglycemia):<\/strong> Severe hypoglycemia causes nervous system failure, resulting in reduced sympathetic tone on blood vessels and vasodilation.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Effects:<\/strong>\n<ul>\n<li><strong>No pressure or flow<\/strong>\u00a0to tissues, organs become hypoxic.<\/li>\n<li><strong>Brain and neurons<\/strong>\u00a0suffer from lack of oxygen, leading to\u00a0<strong>dizziness<\/strong>,\u00a0<strong>confusion<\/strong>,\u00a0<strong>loss of consciousness<\/strong>,\u00a0<strong>brain death<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Signs:<\/strong>\n<ul>\n<li>Weak, rapid pulse.<\/li>\n<li>Anxiety, restlessness, tachycardia.<\/li>\n<li>Cool, clammy skin (except in sepsis, where fever may be present).<\/li>\n<li>Confusion, dizziness<\/li>\n<li><strong>Organ dysfunction<\/strong> (including kidney failure, liver damage and signs of brain hypoxia).<\/li>\n<li><strong>Signs of hypoxia:<\/strong>\u00a0headache, fatigue, decreased responsiveness, coma.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Treatment:<\/strong>\n<ul>\n<li>Epinephrine in anaphylactic shock.<\/li>\n<li>Antibiotics in septic shock.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>Signs and Symptoms:<\/strong><\/h1>\n<ul>\n<li>Early:\u00a0<strong>Anxiety, restlessness, tachycardia<\/strong>.<\/li>\n<li>Progression:\n<ul>\n<li><strong>Hypotension<\/strong>\u00a0(low blood pressure).<\/li>\n<li><strong>Cold, clammy skin<\/strong>\u00a0due to vasoconstriction.<\/li>\n<li><strong>Decreased urine output<\/strong>.<\/li>\n<li><strong>Weak or rapid pulse<\/strong>.<\/li>\n<li><strong>Confusion, dizziness, weakness, fatigue<\/strong>.<\/li>\n<li><strong>Organ failure<\/strong> (kidneys, liver, lungs, brain) in late stages.<\/li>\n<li><strong style=\"text-align: initial;font-size: 1em\">Signs of hypoxia<\/strong><span style=\"text-align: initial;font-size: 1em\">, acidosis, and cell death.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>Organ Damage &amp; Fatal Outcomes:<\/strong><\/h1>\n<ul>\n<li>Sluggish blood flow leads to\u00a0<strong>clots<\/strong>.<\/li>\n<li>Emboli can cause\u00a0<strong>organ infarction<\/strong>\u00a0(brain, kidney, lungs).<\/li>\n<li><strong>Metabolic acidosis<\/strong>\u00a0occurs from anaerobic respiration and lactic acid buildup.<\/li>\n<li><strong>Kidney failure:<\/strong>\u00a0due to ischemia and necrosis, with accumulation of waste products (urea, creatinine).<\/li>\n<\/ul>\n<p><strong>All these effects<\/strong>\u00a0can lead to\u00a0<strong>multi-organ failure<\/strong>\u00a0and\u00a0<strong>death<\/strong>\u00a0if untreated.<\/p>\n<h1>Body&#8217;s Compensations Mechanisms:<\/h1>\n<ul>\n<li><strong>Neural (sympathetic):<\/strong>\n<ul>\n<li>Increased heart rate.<\/li>\n<li>Venoconstriction to maintain preload.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Endocrine:<\/strong>\n<ul>\n<li><strong>Renin-angiotensin-aldosterone system (RAAAS):<\/strong>\n<ul>\n<li>Kidneys secrete\u00a0<strong>renin<\/strong> \u2192 angiotensin II causes vasoconstriction and stimulates aldosterone and ADH secretion.<\/li>\n<li>Aldosterone and ADH retains salt and water, increasing blood volume.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Antidiuretic hormone (ADH):<\/strong>\u00a0increases water reabsorption.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><strong>Effects:<\/strong>\u00a0Maintain blood pressure initially but worsens fluid overload if prolonged.<\/p>\n<h1><strong>Treatment Strategies and Emergency Response:<\/strong><\/h1>\n<ol>\n<li><strong>Hypovolemic Shock:<\/strong>\n<ul>\n<li>Stop bleeding if present.<\/li>\n<li>Restore blood volume with\u00a0<strong>IV fluids<\/strong>\u00a0or\u00a0<strong>blood transfusions<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Anaphylactic Shock:<\/strong>\n<ul>\n<li>Administer\u00a0<strong>epinephrine<\/strong>\u00a0(epi-pen).<\/li>\n<li>Give\u00a0<strong>antihistamines<\/strong>\u00a0and\u00a0<strong>anti-inflammatories<\/strong>.<\/li>\n<li>Maintain\u00a0<strong>airway<\/strong>\u00a0and provide\u00a0<strong>oxygen<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Septic Shock:<\/strong>\n<ul>\n<li>Treat underlying\u00a0<strong>infection<\/strong>\u00a0with antibiotics.<\/li>\n<li>Use\u00a0<strong>vasoconstrictors<\/strong>\u00a0if blood vessels are dilated excessively.<\/li>\n<li>Provide\u00a0<strong>oxygen<\/strong>\u00a0and supportive care.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Other supportive measures:<\/strong>\n<ul>\n<li><strong>Oxygen therapy<\/strong>\u00a0to maximize oxygen delivery.<\/li>\n<li><strong>Vasoactive drugs<\/strong> to restore blood pressure in vasodilatory shock (e.g., vasocontrictors such as epinephrine).<\/li>\n<li>Keep patient\u00a0<strong>comfortable<\/strong>\u00a0and monitor vital signs.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><strong>Emergency Response:<\/strong><\/p>\n<ul>\n<li>Call\u00a0<strong>911<\/strong>\u00a0immediately.<\/li>\n<li>Control bleeding and hypoxia.<\/li>\n<li>Provide <strong style=\"text-align: initial;font-size: 1em\">fluids<\/strong><span style=\"text-align: initial;font-size: 1em\">,\u00a0<\/span><strong style=\"text-align: initial;font-size: 1em\">medications<\/strong><span style=\"text-align: initial;font-size: 1em\">, and\u00a0<\/span><strong style=\"text-align: initial;font-size: 1em\">airway management<\/strong><span style=\"text-align: initial;font-size: 1em\"> as needed.<\/span><\/li>\n<li>Can be fatal if not treated.<\/li>\n<li style=\"list-style-type: none\"><\/li>\n<\/ul>\n<h1><strong>Summary:<\/strong><\/h1>\n<p>Shock involves inadequate blood flow from various causes: volume loss (hypovolemic), heart failure (cardiogenic), obstructions (obstructive), or abnormal vessel dilation (vasogenic). Treatment centers on restoring blood volume, removing obstructions, and reversing vasodilation, depending on the type. Early recognition and intervention are crucial to prevent organ failure and death.<\/p>\n<p>&nbsp;<\/p>\n<p>Shock is a life-threatening condition caused by various mechanisms disrupting blood flow and oxygen delivery. Early recognition, resuscitation, and targeted treatment of the underlying cause are critical to prevent organ failure and death. Proper supportive care, including oxygen and fluids, is essential in managing all types of shock.<\/p>\n<h1>Summary Table:<\/h1>\n<table class=\"grid landscape\" style=\"height: 366px\">\n<tbody>\n<tr style=\"height: 30px\">\n<td style=\"height: 30px;width: 146.494px\"><strong>Type<\/strong><\/td>\n<td style=\"height: 30px;width: 226.2px\"><strong>Mechanism<\/strong><\/td>\n<td style=\"height: 30px;width: 347.306px\"><strong>Specific Cause<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 61px\">\n<td style=\"height: 61px;width: 146.494px\">Hypovolemic<\/td>\n<td style=\"height: 61px;width: 226.2px\">Loss of blood or plasma<\/td>\n<td style=\"height: 61px;width: 347.306px\">Hemorrhage, burns (fluid shift &amp; edema), dehydration, peritonitis (fluid shift \u2192 third-spacing), pancreatitis<\/td>\n<\/tr>\n<tr style=\"height: 46px\">\n<td style=\"height: 46px;width: 146.494px\">Cardiogenic<\/td>\n<td style=\"height: 46px;width: 226.2px\">Decreased pumping capability of the heart<\/td>\n<td style=\"height: 46px;width: 347.306px\">Myocardial infarction of left ventricle, cardiac arrhythmia, <em>pulmonary embolus, cardiac tamponade<\/em><\/td>\n<\/tr>\n<tr style=\"height: 46px\">\n<td style=\"height: 46px;width: 146.494px\">Obstructive<\/td>\n<td style=\"height: 46px;width: 226.2px\">Interference with blood flow through the heart<\/td>\n<td style=\"height: 46px;width: 347.306px\">Cardiac tamponade or pulmonary embolus<\/td>\n<\/tr>\n<tr style=\"height: 61px\">\n<td style=\"height: 61px;width: 146.494px\">Vasogenic (neurogenic or *distributive)<\/td>\n<td style=\"height: 61px;width: 226.2px\">Vasodilation owing to\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 loss of sympathetic &amp; vasomotor tone<\/td>\n<td style=\"height: 61px;width: 347.306px\">Pain and fear, spinal cord injury (loss of SNS), hypoglycemia (insulin shock)<\/td>\n<\/tr>\n<tr style=\"height: 61px\">\n<td style=\"height: 61px;width: 146.494px\">Anaphylactic*<\/td>\n<td style=\"height: 61px;width: 226.2px\">Systemic vasodilation &amp; increased permeability owing to severe allergic reaction<\/td>\n<td style=\"height: 61px;width: 347.306px\">Insect stings, drugs, nuts, shellfish stimulating mast cells to release massive amounts of histamine<\/td>\n<\/tr>\n<tr style=\"height: 61px\">\n<td style=\"height: 61px;width: 146.494px\">Septic* (endotoxic)<\/td>\n<td style=\"height: 61px;width: 226.2px\">Vasodilation owing to severe infection, often with gram-negative bacteria<\/td>\n<td style=\"height: 61px;width: 347.306px\">Virulent microorganisms (gram-negative bacteria) or multiple infections cause APCs to release massive cytokines\u2192\u2191NO\u2192\u2191 vasodilation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n","protected":false},"author":1370,"menu_order":35,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["zoe-soon"],"pb_section_license":"cc-by-nc-sa"},"chapter-type":[],"contributor":[60],"license":[57],"class_list":["post-5661","chapter","type-chapter","status-web-only","hentry","contributor-zoe-soon","license-cc-by-nc-sa"],"part":55,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/users\/1370"}],"version-history":[{"count":11,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5661\/revisions"}],"predecessor-version":[{"id":5672,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5661\/revisions\/5672"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/parts\/55"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5661\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/media?parent=5661"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapter-type?post=5661"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/contributor?post=5661"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/license?post=5661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}