{"id":5622,"date":"2025-12-13T15:26:13","date_gmt":"2025-12-13T20:26:13","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/?post_type=chapter&#038;p=5622"},"modified":"2025-12-13T17:53:48","modified_gmt":"2025-12-13T22:53:48","slug":"congestive-heart-failure-chf","status":"web-only","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/chapter\/congestive-heart-failure-chf\/","title":{"raw":"7p23  Congestive Heart Failure (CHF)","rendered":"7p23  Congestive Heart Failure (CHF)"},"content":{"raw":"<h1><strong>CHF Definition &amp; Overview:<\/strong><\/h1>\r\n<ul>\r\n \t<li>A condition where the\u00a0<strong>heart cannot pump enough blood<\/strong>\u00a0to meet the\u00a0<strong>metabolic demands<\/strong>\u00a0of the body.<\/li>\r\n \t<li>Usually\u00a0<strong>chronic<\/strong>, but can be\u00a0<strong>acute<\/strong>\u00a0in severe cases.<\/li>\r\n \t<li>Primarily caused by\u00a0<strong>weakened heart muscle<\/strong>\u00a0or\u00a0<strong>valvular defects<\/strong>\u00a0that reduce\u00a0<strong>contractility<\/strong>.<\/li>\r\n<\/ul>\r\n<h1><strong>Causes &amp; Contributing Factors:<\/strong><\/h1>\r\n<ul>\r\n \t<li><strong>Cardiopulmonary conditions<\/strong>\u00a0such as:\r\n<ul>\r\n \t<li>Previous myocardial infarction.<\/li>\r\n \t<li>Valve diseases.<\/li>\r\n \t<li><strong>High blood pressure (hypertension):<\/strong>\u00a0often leads to\u00a0<strong>left-sided heart failure<\/strong>.<\/li>\r\n \t<li>Lung diseases (e.g., COPD) causing\u00a0<strong>cor pulmonale<\/strong>\u00a0(right-sided failure).<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Increased workload, e.g., from\u00a0<strong>hypertension<\/strong>\u00a0or\u00a0<strong>lung disease<\/strong>, strains the heart and leads to failure over time.<\/li>\r\n<\/ul>\r\n<h1><strong>Types of Congestive Heart Failure:<\/strong><\/h1>\r\n<ol>\r\n \t<li><strong> Left-Sided Heart Failure:<\/strong><\/li>\r\n<\/ol>\r\n<ul>\r\n \t<li>Most common type.<\/li>\r\n \t<li>Usually results from\u00a0<strong>damage to the left ventricle<\/strong>, often due to\u00a0<strong>myocardial infarction<\/strong>\u00a0or\u00a0<strong>chronic hypertension<\/strong>.<\/li>\r\n \t<li>Damage decreases left ventricle contractility, leading to both <strong>reduced stroke volume<\/strong>\u00a0and\u00a0<strong>cardiac output<\/strong>.<\/li>\r\n \t<li><strong>Features:<\/strong>\r\n<ul>\r\n \t<li>Blood backs up into the\u00a0<strong>lungs<\/strong>.<\/li>\r\n \t<li>Causes\u00a0<strong>pulmonary congestion<\/strong>\u00a0and\u00a0<strong>edema<\/strong>.<\/li>\r\n \t<li>Symptoms:\u00a0<strong>shortness of breath<\/strong>,\u00a0<strong>orthopnea<\/strong>,\u00a0<strong>pulmonary edema<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<ol start=\"2\">\r\n \t<li><strong> Right-Sided Heart Failure:<\/strong><\/li>\r\n<\/ol>\r\n<ul>\r\n \t<li>Often caused by\u00a0<strong>left-sided failure<\/strong>\u00a0or\u00a0<strong>pulmonary disease<\/strong>.<\/li>\r\n \t<li>Blood backs up into\u00a0<strong>systemic circulation<\/strong>, leading to\u00a0<strong>peripheral edema<\/strong>.<\/li>\r\n \t<li>Commonly involves\u00a0<strong>decreased blood flow to the lungs<\/strong>\u00a0(cor pulmonale).<\/li>\r\n \t<li>Symptoms:\u00a0<strong>jugular venous distension<\/strong>,\u00a0<strong>peripheral edema<\/strong>,\u00a0<strong>ascites<\/strong>.<\/li>\r\n<\/ul>\r\n<h1><strong>Clinical Manifestations:<\/strong><\/h1>\r\n<ul>\r\n \t<li>Patients may\u00a0<strong>manage daily activities<\/strong>\u00a0fine initially, but\u00a0<strong>exercise intolerance<\/strong>\u00a0develops.<\/li>\r\n \t<li>Struggle with\u00a0<strong>climbing stairs<\/strong>\u00a0or performing vigorous activity.<\/li>\r\n \t<li><strong>Compensation mechanisms<\/strong>\u00a0are activated to maintain\u00a0<strong>organ perfusion<\/strong>:\r\n<ul>\r\n \t<li>These include increased\u00a0<strong>heart rate<\/strong>\u00a0and\u00a0<strong>stroke volume<\/strong>.<\/li>\r\n \t<li><strong>Neurohormonal responses<\/strong>\u00a0like activating the\u00a0<strong>renin-angiotensin-aldosterone system<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>Body\u2019s Compensation<\/strong><strong> of Left-Sided CHF<\/strong><strong>:<\/strong><\/h1>\r\n<h1><strong>1.\u00a0 Neural response:<\/strong><\/h1>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li>Brain detects\u00a0<strong>low blood pressure<\/strong>\u00a0and\u00a0<strong>low oxygen<\/strong>.\r\n<ul>\r\n \t<li><strong>Baroreceptors<\/strong>\u00a0detect\u00a0<strong>low blood pressure<\/strong>, sending the information to the<\/li>\r\n \t<li><strong>Medulla oblongata<\/strong> which activates the <strong>sympathetic nervous system (SNS)<\/strong> which:\r\n<ul>\r\n \t<li>Increases <strong>heart rate<\/strong>\u00a0and\u00a0<strong>force of contraction<\/strong>.<\/li>\r\n \t<li>Causes\u00a0<strong>vasoconstriction<\/strong>\u00a0(\u2191 afterload).<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Activates\u00a0<strong>sympathetic nervous system<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Increases\u00a0<strong>heart rate<\/strong>,\u00a0<strong>force of contraction<\/strong>, and induces\u00a0<strong>vasoconstriction<\/strong>.<\/li>\r\n \t<li><strong>Outcome:<\/strong>\u00a0Maintains perfusion but increases\u00a0<strong>afterload<\/strong>, making it harder for the heart to eject blood.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>2.\u00a0 Hormonal response (RAAASE):<\/strong><\/h1>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Renin-Angiotensin II-ADH-Aldosterone Sympathetic Erythropoietin System:<\/strong><\/li>\r\n \t<li>Kidneys sense low blood flow\/pressure.<\/li>\r\n \t<li>Kidneys release\u00a0<strong><span style=\"text-decoration: underline\">R<\/span>enin<\/strong>\u00a0in response to \u2193 blood flow.<\/li>\r\n \t<li>Renin converts inactive <strong>angiotensinogen<\/strong>\u00a0into\u00a0<strong>angiotensin I<\/strong>.<\/li>\r\n \t<li><strong>ACE<\/strong> (released from lungs) converts angiotensin I into active form, <strong><span style=\"text-decoration: underline\">A<\/span>ngiotensin II<\/strong> which:\r\n<ul>\r\n \t<li>Causes\u00a0<strong>vasoconstriction<\/strong>\u00a0\u2192 \u2191 blood pressure and afterload.<\/li>\r\n \t<li>Stimulates <strong><span style=\"text-decoration: underline\">A<\/span>DH<\/strong> release from posterior pituitary gland<\/li>\r\n \t<li>Stimulates\u00a0<strong><span style=\"text-decoration: underline\">A<\/span>ldosterone<\/strong> release from adrenal glands, both ADH and aldosterone:\r\n<ul>\r\n \t<li>Increase salt and water retention.<\/li>\r\n \t<li>Elevate blood volume and BP, further increasing workload.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Angiotensin II causes\u00a0<strong>vasoconstriction<\/strong>, increasing resistance (blood pressure).<\/li>\r\n \t<li><strong>Increased blood volume<\/strong>\u00a0(preload), aiming to improve tissue perfusion.<\/li>\r\n \t<li><strong>Secretes<\/strong>\u00a0<strong>Erythropoietin<\/strong>, leading to\u00a0<strong>polycythemia<\/strong>\u00a0(more red blood cells for oxygen transport).<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>3.\u00a0 Heart Remodeling &amp; Progressive Deterioration:<\/strong><\/h1>\r\n<ul>\r\n \t<li>Increased workload causes\u00a0<strong>pathologic hypertrophy<\/strong> of the left ventricle:\r\n<ul>\r\n \t<li>Heart wall thickens, becoming\u00a0<strong>spherical<\/strong>\u00a0(<strong>cardiomegaly<\/strong>).<\/li>\r\n \t<li>Excessive hypertrophy diminishes efficiency; the heart becomes\u00a0<strong>less effective<\/strong>.<\/li>\r\n \t<li>Hypertrophied heart muscle requires\u00a0<strong>more oxygen<\/strong>, but blood supply may not keep pace.<\/li>\r\n \t<li>Insufficient blood supply causes\u00a0<strong>myocardial hypoxia<\/strong>, weakening the heart further.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Outcome:<\/strong>\u00a0The weakened heart cannot sustain a high stroke volume;\u00a0<strong>cardiac output declines<\/strong>.<\/li>\r\n<\/ul>\r\n<h1><strong>4.\u00a0 Pulmonary Consequences:<\/strong><\/h1>\r\n<ul>\r\n \t<li>Blood\u00a0<strong>backs up into pulmonary circulation<\/strong>:\r\n<ul>\r\n \t<li>Engorged pulmonary vessels.<\/li>\r\n \t<li>Causes\u00a0<strong>pulmonary congestion<\/strong>\u00a0and\u00a0<strong>edema<\/strong> (including fluid in alveoli).\r\n<ul>\r\n \t<li>Impaired gas exchange \u2192\u00a0<strong>dyspnea<\/strong>\u00a0and\u00a0<strong>hypoxia<\/strong>.<\/li>\r\n \t<li><strong>Shortness of breath (dyspnea):<\/strong>\u00a0Especially\u00a0<strong>orthopnea<\/strong>\u00a0(difficulty breathing when lying flat).\r\n<ul>\r\n \t<li><strong>Paroxysmal nocturnal dyspnea:<\/strong>\u00a0Sudden nighttime breathlessness.<\/li>\r\n \t<li><strong>Cough:<\/strong>\u00a0Often dry, irritant response; may cough up blood (<strong>hemoptysis<\/strong>).<\/li>\r\n \t<li>Physical signs: pulmonary crackles, wet sounds, cyanosis.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Reduced\u00a0<strong>cardiac output<\/strong>\u00a0leads to\u00a0<strong>organ hypoxia<\/strong>,\u00a0<strong>dizziness<\/strong>,\u00a0<strong>confusion<\/strong>.<\/li>\r\n \t<li>Cells switch to\u00a0<strong>anaerobic respiration<\/strong>, produce\u00a0<strong>lactic acid<\/strong>\u00a0\u2192\u00a0<strong>acidosis<\/strong>.<\/li>\r\n \t<li>The\u00a0<strong>brain<\/strong>\u00a0stimulates increased respiration rate to compensate.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n&nbsp;\r\n<ul>\r\n \t<li>Chronic pulmonary edema visible on chest X-ray as\u00a0<strong>white, opaque lungs<\/strong>.<\/li>\r\n<\/ul>\r\n<h1><strong>5.\u00a0 Progression to Right-Sided Failure:<\/strong><\/h1>\r\n<ul>\r\n \t<li>The\u00a0<strong>pulmonary circuit<\/strong>\u00a0becomes congested and\u00a0<strong>increased pressure (pulmonary hypertension)<\/strong>\u00a0develops.<\/li>\r\n \t<li>Elevated pressure in pulmonary vessels makes it harder for the\u00a0<strong>right ventricle<\/strong>\u00a0to eject blood.<\/li>\r\n \t<li>The\u00a0<strong>right ventricle<\/strong>\u00a0hypertrophies and weakens.<\/li>\r\n \t<li>Blood\u00a0<strong>backs up into systemic circulation<\/strong>:\r\n<ul>\r\n \t<li><strong>Engorged blood vessels<\/strong>.<\/li>\r\n \t<li><strong>Edema in feet, legs, and abdominal cavity<\/strong>.<\/li>\r\n \t<li>Impaired function of digestive organs.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Progression:<\/strong>\u00a0Left-sided failure often progresses to\u00a0<strong>right-sided failure<\/strong>.<\/li>\r\n \t<li>Progressive worsening of cardiac function and eventual\u00a0<strong>heart failure<\/strong>.<\/li>\r\n<\/ul>\r\n<strong>End-Stage &amp; Worsening:<\/strong>\r\n<ul>\r\n \t<li>Persistent volume overload and pressure lead to\u00a0<strong>worsening hypertrophy<\/strong>\u00a0and\u00a0<strong>heart deterioration<\/strong>.<\/li>\r\n \t<li>Increased\u00a0<strong>atrial stretch<\/strong>\u00a0raises\u00a0<strong>atrial natriuretic peptide (ANP)<\/strong>\u00a0secretion.<\/li>\r\n \t<li><strong>An increased ANP:<\/strong>\r\n<ul>\r\n \t<li>Opposes\u00a0<strong>aldosterone<\/strong>\u00a0and\u00a0<strong>ADH<\/strong>.<\/li>\r\n \t<li>Promotes\u00a0<strong>natriuresis<\/strong>\u00a0(salt and water excretion).<\/li>\r\n \t<li>Attempts to reduce\u00a0<strong>blood volume<\/strong>\u00a0and\u00a0<strong>pressure<\/strong>, but is a sign of advanced disease.<\/li>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Eventually decreased urine output (oliguria)<\/strong>\u00a0due to reduced kidney perfusion.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>Right-Sided Congestive Heart Failure (CHF) \u2013 Comparison to Left-Sided CHF, Pathophysiology and Causes:<\/strong><\/h1>\r\n<h1><strong>1.\u00a0 Predisposing Factors of Right-Sided CHF:<\/strong><\/h1>\r\n<ul>\r\n \t<li><strong>Primary cause:<\/strong>\u00a0Damage to the\u00a0<strong>right ventricle<\/strong>, often due to\u00a0<strong>myocardial infarction<\/strong>\u00a0or\u00a0<strong>valvular issues<\/strong>.\r\n<ul>\r\n \t<li>A weakened right ventricle can't effectively empty, leading to\u00a0<strong>decreased blood flow<\/strong>\u00a0through the\u00a0<strong>pulmonary circulation<\/strong>.<\/li>\r\n \t<li><strong>Consequence:<\/strong>\u00a0Less blood reaches the\u00a0<strong>left side of the heart<\/strong>, reducing\u00a0<strong>stroke volume<\/strong>\u00a0and\u00a0<strong>cardiac output<\/strong>\u00a0overall.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n&nbsp;\r\n<ul>\r\n \t<li><strong>Two Secondary causes (most common):<\/strong>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Left-sided failure<\/strong>\u00a0\u2192 Pulmonary congestion \u2192 Pulmonary hypertension \u2192 Right ventricle hypertrophy and failure.<\/li>\r\n \t<li><strong>Lung disease (cor pulmonale):<\/strong>\u00a0Conditions like\u00a0<strong>emphysema<\/strong>\u00a0cause\u00a0<strong>damage to alveolar capillaries<\/strong> which increases<strong> pulmonary vessel narrowing<\/strong> and<strong> pulmonary resistance (pulmonary hypertension)<\/strong>.\r\n<ul>\r\n \t<li><strong>Pulmonary Hypertension &amp; Cor Pulmonale:<\/strong><\/li>\r\n \t<li><strong>Lung damage<\/strong>\u00a0(from smoking, infection, or other lung disease) leads to:\r\n<ul>\r\n \t<li><strong>Capillary damage<\/strong>\u00a0\u2192 scars and narrowing of vessels.<\/li>\r\n \t<li>Increased\u00a0<strong>pulmonary vascular resistance<\/strong>\u00a0\u2192\u00a0<strong>pulmonary hypertension<\/strong>.<\/li>\r\n \t<li><strong>Right ventricle hypertrophies<\/strong>\u00a0in response to increased afterload.<\/li>\r\n \t<li>Over time, the\u00a0<strong>right ventricle weakens<\/strong>\u00a0and\u00a0<strong>fails<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>2.\u00a0 Hemodynamic Changes of Right-Sided CHF:<\/strong><\/h1>\r\n<ul>\r\n \t<li><strong>Blood backs up into systemic circulation<\/strong>:\r\n<ul>\r\n \t<li><strong>Vena cavae<\/strong>\u00a0(superior and inferior) become\u00a0<strong>engorged<\/strong>.<\/li>\r\n \t<li><strong>Increased pressure<\/strong>\u00a0causes\u00a0<strong>leakage<\/strong>\u00a0of exudate into tissues.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Edema formation:<\/strong>\r\n<ul>\r\n \t<li style=\"list-style-type: none\">\r\n<ul>\r\n \t<li><strong>Peripheral edema:<\/strong>\u00a0Legs, feet, ankles, and abdomen (<strong>ascites<\/strong>).<\/li>\r\n \t<li><strong>Jugular venous distension:<\/strong>\u00a0Swollen neck veins.<\/li>\r\n \t<li><strong>Hepatosplenomegaly:<\/strong> Enlarged liver and spleen due to vascular congestion (engorgement and pressure).<\/li>\r\n \t<li><strong>Digestive disturbances:<\/strong>\u00a0Loss of appetite, nausea, and abdominal discomfort.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Signs of systemic congestion:<\/strong>\u00a0Cyanosis, fatigue, and signs of hypoxia affecting organs.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1><strong>3.\u00a0 Cerebral &amp; Organ Effects of Right-Sided CHF:<\/strong><\/h1>\r\n<ul>\r\n \t<li><strong>Brain:<\/strong>\r\n<ul>\r\n \t<li>Increased\u00a0<strong>intracranial pressure<\/strong>\u00a0from edema.<\/li>\r\n \t<li>Reduced blood flow causes\u00a0<strong>hypoxia<\/strong>,\u00a0<strong>confusion<\/strong>, and potential\u00a0<strong>neurological damage<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Other tissues:<\/strong>\r\n<ul>\r\n \t<li>Impaired organ perfusion causes\u00a0<strong>fatigue<\/strong>,\u00a0<strong>weakness<\/strong>, and\u00a0<strong>tissue hypoxia<\/strong>.<\/li>\r\n \t<li>Signs include\u00a0<strong>pale skin<\/strong>,\u00a0<strong>cold extremities<\/strong>, and slow healing wounds.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<h1>4. Body's Compensation of Right-Sided CHF:<\/h1>\r\n<ul>\r\n \t<li>Exactly the same as Body's Compensation of Left-Sided CHF<\/li>\r\n<\/ul>\r\n<h1>CHF Treatment Strategies:<\/h1>\r\n<ul>\r\n \t<li><strong>Vasodilators:<\/strong>\r\n<ul>\r\n \t<li><strong>Alpha blockers<\/strong>\u00a0and\u00a0<strong>vasodilators<\/strong>\u00a0reduce systemic resistance.<\/li>\r\n \t<li><strong>Calcium channel blockers:<\/strong>\u00a0Promote vasodilation and decrease afterload.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li><strong>Beta blockers:<\/strong>\u00a0Slow heart rate and decrease force of contraction, reducing workload.<\/li>\r\n \t<li><strong>Digoxin:<\/strong>\u00a0Increases contractility, helping the heart maintain stroke volume while reducing workload.<\/li>\r\n \t<li><strong>ACE inhibitors:<\/strong>\u00a0Block the formation of angiotensin II, reducing vasoconstriction and lowering blood pressure.<\/li>\r\n \t<li><strong>Diuretics:<\/strong>\u00a0Reduce blood volume and preload, easing the load on the heart.<\/li>\r\n<\/ul>\r\nThese treatments aim to <strong>reduce workload<\/strong>, improve <strong>heart efficiency<\/strong>, and <strong>slow disease progression<\/strong>.\r\n<h1><strong>CHF Compensation &amp; Deterioration:<\/strong><\/h1>\r\n<ul>\r\n \t<li>While initially beneficial,\u00a0<strong>compensatory responses<\/strong>\u00a0<strong>increase workload<\/strong>\u00a0on the heart.<\/li>\r\n \t<li>Over time, these lead to\u00a0<strong>worsening heart failure<\/strong>\u00a0and\u00a0<strong>progressive deterioration<\/strong>.<\/li>\r\n \t<li>Long-term management involves addressing root causes, reducing workload, and preventing compound damage.<\/li>\r\n<\/ul>\r\n<h1><strong>Summary:<\/strong><\/h1>\r\nCongestive heart failure involves inadequate cardiac output, leading to fluid retention, pulmonary congestion, or systemic edema depending on the side affected. The body\u2019s compensatory mechanisms support life temporarily but can accelerate disease progression. Management aims to optimize cardiac function, reduce workload, and prevent complications.\r\n\r\nLeft-sided CHF begins with weakened left ventricle function, leading to pulmonary congestion and edema. Compensation mechanisms initially preserve perfusion but eventually worsen heart strain, promote hypertrophy, and cause systemic and pulmonary circulatory failure, often progressing to right-sided failure and widespread edema. Early detection and management are essential to interrupt this vicious cycle.\u00a0 Treatment aims to reduce preload, afterload, and myocardial workload, preventing progression and improving quality of life.\r\n\r\nRight-sided CHF results from primary right ventricular failure or secondary to left-sided failure or lung disease. It causes systemic venous congestion, peripheral edema, and organ hypoperfusion. The body compensates through neurohormonal activation, but long-term, this worsens cardiac hypertrophy and deteriorates heart function. Early detection and intervention are crucial to prevent progression to biventricular failure.\r\n\r\nCHF affects both sides of the heart, leading to pulmonary congestion or systemic edema depending on the failure side. The body\u2019s compensatory mechanisms initially support organ perfusion but ultimately contribute to worsening heart failure. Monitoring blood volume and pressures, along with managing symptoms and underlying causes, is crucial in treatment. An increase in atrial natriuretic peptide signifies severe or progressing heart failure.\r\n\r\n&nbsp;","rendered":"<h1><strong>CHF Definition &amp; Overview:<\/strong><\/h1>\n<ul>\n<li>A condition where the\u00a0<strong>heart cannot pump enough blood<\/strong>\u00a0to meet the\u00a0<strong>metabolic demands<\/strong>\u00a0of the body.<\/li>\n<li>Usually\u00a0<strong>chronic<\/strong>, but can be\u00a0<strong>acute<\/strong>\u00a0in severe cases.<\/li>\n<li>Primarily caused by\u00a0<strong>weakened heart muscle<\/strong>\u00a0or\u00a0<strong>valvular defects<\/strong>\u00a0that reduce\u00a0<strong>contractility<\/strong>.<\/li>\n<\/ul>\n<h1><strong>Causes &amp; Contributing Factors:<\/strong><\/h1>\n<ul>\n<li><strong>Cardiopulmonary conditions<\/strong>\u00a0such as:\n<ul>\n<li>Previous myocardial infarction.<\/li>\n<li>Valve diseases.<\/li>\n<li><strong>High blood pressure (hypertension):<\/strong>\u00a0often leads to\u00a0<strong>left-sided heart failure<\/strong>.<\/li>\n<li>Lung diseases (e.g., COPD) causing\u00a0<strong>cor pulmonale<\/strong>\u00a0(right-sided failure).<\/li>\n<\/ul>\n<\/li>\n<li>Increased workload, e.g., from\u00a0<strong>hypertension<\/strong>\u00a0or\u00a0<strong>lung disease<\/strong>, strains the heart and leads to failure over time.<\/li>\n<\/ul>\n<h1><strong>Types of Congestive Heart Failure:<\/strong><\/h1>\n<ol>\n<li><strong> Left-Sided Heart Failure:<\/strong><\/li>\n<\/ol>\n<ul>\n<li>Most common type.<\/li>\n<li>Usually results from\u00a0<strong>damage to the left ventricle<\/strong>, often due to\u00a0<strong>myocardial infarction<\/strong>\u00a0or\u00a0<strong>chronic hypertension<\/strong>.<\/li>\n<li>Damage decreases left ventricle contractility, leading to both <strong>reduced stroke volume<\/strong>\u00a0and\u00a0<strong>cardiac output<\/strong>.<\/li>\n<li><strong>Features:<\/strong>\n<ul>\n<li>Blood backs up into the\u00a0<strong>lungs<\/strong>.<\/li>\n<li>Causes\u00a0<strong>pulmonary congestion<\/strong>\u00a0and\u00a0<strong>edema<\/strong>.<\/li>\n<li>Symptoms:\u00a0<strong>shortness of breath<\/strong>,\u00a0<strong>orthopnea<\/strong>,\u00a0<strong>pulmonary edema<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ol start=\"2\">\n<li><strong> Right-Sided Heart Failure:<\/strong><\/li>\n<\/ol>\n<ul>\n<li>Often caused by\u00a0<strong>left-sided failure<\/strong>\u00a0or\u00a0<strong>pulmonary disease<\/strong>.<\/li>\n<li>Blood backs up into\u00a0<strong>systemic circulation<\/strong>, leading to\u00a0<strong>peripheral edema<\/strong>.<\/li>\n<li>Commonly involves\u00a0<strong>decreased blood flow to the lungs<\/strong>\u00a0(cor pulmonale).<\/li>\n<li>Symptoms:\u00a0<strong>jugular venous distension<\/strong>,\u00a0<strong>peripheral edema<\/strong>,\u00a0<strong>ascites<\/strong>.<\/li>\n<\/ul>\n<h1><strong>Clinical Manifestations:<\/strong><\/h1>\n<ul>\n<li>Patients may\u00a0<strong>manage daily activities<\/strong>\u00a0fine initially, but\u00a0<strong>exercise intolerance<\/strong>\u00a0develops.<\/li>\n<li>Struggle with\u00a0<strong>climbing stairs<\/strong>\u00a0or performing vigorous activity.<\/li>\n<li><strong>Compensation mechanisms<\/strong>\u00a0are activated to maintain\u00a0<strong>organ perfusion<\/strong>:\n<ul>\n<li>These include increased\u00a0<strong>heart rate<\/strong>\u00a0and\u00a0<strong>stroke volume<\/strong>.<\/li>\n<li><strong>Neurohormonal responses<\/strong>\u00a0like activating the\u00a0<strong>renin-angiotensin-aldosterone system<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>Body\u2019s Compensation<\/strong><strong> of Left-Sided CHF<\/strong><strong>:<\/strong><\/h1>\n<h1><strong>1.\u00a0 Neural response:<\/strong><\/h1>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li>Brain detects\u00a0<strong>low blood pressure<\/strong>\u00a0and\u00a0<strong>low oxygen<\/strong>.\n<ul>\n<li><strong>Baroreceptors<\/strong>\u00a0detect\u00a0<strong>low blood pressure<\/strong>, sending the information to the<\/li>\n<li><strong>Medulla oblongata<\/strong> which activates the <strong>sympathetic nervous system (SNS)<\/strong> which:\n<ul>\n<li>Increases <strong>heart rate<\/strong>\u00a0and\u00a0<strong>force of contraction<\/strong>.<\/li>\n<li>Causes\u00a0<strong>vasoconstriction<\/strong>\u00a0(\u2191 afterload).<\/li>\n<\/ul>\n<\/li>\n<li>Activates\u00a0<strong>sympathetic nervous system<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li>Increases\u00a0<strong>heart rate<\/strong>,\u00a0<strong>force of contraction<\/strong>, and induces\u00a0<strong>vasoconstriction<\/strong>.<\/li>\n<li><strong>Outcome:<\/strong>\u00a0Maintains perfusion but increases\u00a0<strong>afterload<\/strong>, making it harder for the heart to eject blood.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>2.\u00a0 Hormonal response (RAAASE):<\/strong><\/h1>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Renin-Angiotensin II-ADH-Aldosterone Sympathetic Erythropoietin System:<\/strong><\/li>\n<li>Kidneys sense low blood flow\/pressure.<\/li>\n<li>Kidneys release\u00a0<strong><span style=\"text-decoration: underline\">R<\/span>enin<\/strong>\u00a0in response to \u2193 blood flow.<\/li>\n<li>Renin converts inactive <strong>angiotensinogen<\/strong>\u00a0into\u00a0<strong>angiotensin I<\/strong>.<\/li>\n<li><strong>ACE<\/strong> (released from lungs) converts angiotensin I into active form, <strong><span style=\"text-decoration: underline\">A<\/span>ngiotensin II<\/strong> which:\n<ul>\n<li>Causes\u00a0<strong>vasoconstriction<\/strong>\u00a0\u2192 \u2191 blood pressure and afterload.<\/li>\n<li>Stimulates <strong><span style=\"text-decoration: underline\">A<\/span>DH<\/strong> release from posterior pituitary gland<\/li>\n<li>Stimulates\u00a0<strong><span style=\"text-decoration: underline\">A<\/span>ldosterone<\/strong> release from adrenal glands, both ADH and aldosterone:\n<ul>\n<li>Increase salt and water retention.<\/li>\n<li>Elevate blood volume and BP, further increasing workload.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Angiotensin II causes\u00a0<strong>vasoconstriction<\/strong>, increasing resistance (blood pressure).<\/li>\n<li><strong>Increased blood volume<\/strong>\u00a0(preload), aiming to improve tissue perfusion.<\/li>\n<li><strong>Secretes<\/strong>\u00a0<strong>Erythropoietin<\/strong>, leading to\u00a0<strong>polycythemia<\/strong>\u00a0(more red blood cells for oxygen transport).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>3.\u00a0 Heart Remodeling &amp; Progressive Deterioration:<\/strong><\/h1>\n<ul>\n<li>Increased workload causes\u00a0<strong>pathologic hypertrophy<\/strong> of the left ventricle:\n<ul>\n<li>Heart wall thickens, becoming\u00a0<strong>spherical<\/strong>\u00a0(<strong>cardiomegaly<\/strong>).<\/li>\n<li>Excessive hypertrophy diminishes efficiency; the heart becomes\u00a0<strong>less effective<\/strong>.<\/li>\n<li>Hypertrophied heart muscle requires\u00a0<strong>more oxygen<\/strong>, but blood supply may not keep pace.<\/li>\n<li>Insufficient blood supply causes\u00a0<strong>myocardial hypoxia<\/strong>, weakening the heart further.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Outcome:<\/strong>\u00a0The weakened heart cannot sustain a high stroke volume;\u00a0<strong>cardiac output declines<\/strong>.<\/li>\n<\/ul>\n<h1><strong>4.\u00a0 Pulmonary Consequences:<\/strong><\/h1>\n<ul>\n<li>Blood\u00a0<strong>backs up into pulmonary circulation<\/strong>:\n<ul>\n<li>Engorged pulmonary vessels.<\/li>\n<li>Causes\u00a0<strong>pulmonary congestion<\/strong>\u00a0and\u00a0<strong>edema<\/strong> (including fluid in alveoli).\n<ul>\n<li>Impaired gas exchange \u2192\u00a0<strong>dyspnea<\/strong>\u00a0and\u00a0<strong>hypoxia<\/strong>.<\/li>\n<li><strong>Shortness of breath (dyspnea):<\/strong>\u00a0Especially\u00a0<strong>orthopnea<\/strong>\u00a0(difficulty breathing when lying flat).\n<ul>\n<li><strong>Paroxysmal nocturnal dyspnea:<\/strong>\u00a0Sudden nighttime breathlessness.<\/li>\n<li><strong>Cough:<\/strong>\u00a0Often dry, irritant response; may cough up blood (<strong>hemoptysis<\/strong>).<\/li>\n<li>Physical signs: pulmonary crackles, wet sounds, cyanosis.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Reduced\u00a0<strong>cardiac output<\/strong>\u00a0leads to\u00a0<strong>organ hypoxia<\/strong>,\u00a0<strong>dizziness<\/strong>,\u00a0<strong>confusion<\/strong>.<\/li>\n<li>Cells switch to\u00a0<strong>anaerobic respiration<\/strong>, produce\u00a0<strong>lactic acid<\/strong>\u00a0\u2192\u00a0<strong>acidosis<\/strong>.<\/li>\n<li>The\u00a0<strong>brain<\/strong>\u00a0stimulates increased respiration rate to compensate.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li>Chronic pulmonary edema visible on chest X-ray as\u00a0<strong>white, opaque lungs<\/strong>.<\/li>\n<\/ul>\n<h1><strong>5.\u00a0 Progression to Right-Sided Failure:<\/strong><\/h1>\n<ul>\n<li>The\u00a0<strong>pulmonary circuit<\/strong>\u00a0becomes congested and\u00a0<strong>increased pressure (pulmonary hypertension)<\/strong>\u00a0develops.<\/li>\n<li>Elevated pressure in pulmonary vessels makes it harder for the\u00a0<strong>right ventricle<\/strong>\u00a0to eject blood.<\/li>\n<li>The\u00a0<strong>right ventricle<\/strong>\u00a0hypertrophies and weakens.<\/li>\n<li>Blood\u00a0<strong>backs up into systemic circulation<\/strong>:\n<ul>\n<li><strong>Engorged blood vessels<\/strong>.<\/li>\n<li><strong>Edema in feet, legs, and abdominal cavity<\/strong>.<\/li>\n<li>Impaired function of digestive organs.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Progression:<\/strong>\u00a0Left-sided failure often progresses to\u00a0<strong>right-sided failure<\/strong>.<\/li>\n<li>Progressive worsening of cardiac function and eventual\u00a0<strong>heart failure<\/strong>.<\/li>\n<\/ul>\n<p><strong>End-Stage &amp; Worsening:<\/strong><\/p>\n<ul>\n<li>Persistent volume overload and pressure lead to\u00a0<strong>worsening hypertrophy<\/strong>\u00a0and\u00a0<strong>heart deterioration<\/strong>.<\/li>\n<li>Increased\u00a0<strong>atrial stretch<\/strong>\u00a0raises\u00a0<strong>atrial natriuretic peptide (ANP)<\/strong>\u00a0secretion.<\/li>\n<li><strong>An increased ANP:<\/strong>\n<ul>\n<li>Opposes\u00a0<strong>aldosterone<\/strong>\u00a0and\u00a0<strong>ADH<\/strong>.<\/li>\n<li>Promotes\u00a0<strong>natriuresis<\/strong>\u00a0(salt and water excretion).<\/li>\n<li>Attempts to reduce\u00a0<strong>blood volume<\/strong>\u00a0and\u00a0<strong>pressure<\/strong>, but is a sign of advanced disease.<\/li>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Eventually decreased urine output (oliguria)<\/strong>\u00a0due to reduced kidney perfusion.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>Right-Sided Congestive Heart Failure (CHF) \u2013 Comparison to Left-Sided CHF, Pathophysiology and Causes:<\/strong><\/h1>\n<h1><strong>1.\u00a0 Predisposing Factors of Right-Sided CHF:<\/strong><\/h1>\n<ul>\n<li><strong>Primary cause:<\/strong>\u00a0Damage to the\u00a0<strong>right ventricle<\/strong>, often due to\u00a0<strong>myocardial infarction<\/strong>\u00a0or\u00a0<strong>valvular issues<\/strong>.\n<ul>\n<li>A weakened right ventricle can&#8217;t effectively empty, leading to\u00a0<strong>decreased blood flow<\/strong>\u00a0through the\u00a0<strong>pulmonary circulation<\/strong>.<\/li>\n<li><strong>Consequence:<\/strong>\u00a0Less blood reaches the\u00a0<strong>left side of the heart<\/strong>, reducing\u00a0<strong>stroke volume<\/strong>\u00a0and\u00a0<strong>cardiac output<\/strong>\u00a0overall.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Two Secondary causes (most common):<\/strong>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Left-sided failure<\/strong>\u00a0\u2192 Pulmonary congestion \u2192 Pulmonary hypertension \u2192 Right ventricle hypertrophy and failure.<\/li>\n<li><strong>Lung disease (cor pulmonale):<\/strong>\u00a0Conditions like\u00a0<strong>emphysema<\/strong>\u00a0cause\u00a0<strong>damage to alveolar capillaries<\/strong> which increases<strong> pulmonary vessel narrowing<\/strong> and<strong> pulmonary resistance (pulmonary hypertension)<\/strong>.\n<ul>\n<li><strong>Pulmonary Hypertension &amp; Cor Pulmonale:<\/strong><\/li>\n<li><strong>Lung damage<\/strong>\u00a0(from smoking, infection, or other lung disease) leads to:\n<ul>\n<li><strong>Capillary damage<\/strong>\u00a0\u2192 scars and narrowing of vessels.<\/li>\n<li>Increased\u00a0<strong>pulmonary vascular resistance<\/strong>\u00a0\u2192\u00a0<strong>pulmonary hypertension<\/strong>.<\/li>\n<li><strong>Right ventricle hypertrophies<\/strong>\u00a0in response to increased afterload.<\/li>\n<li>Over time, the\u00a0<strong>right ventricle weakens<\/strong>\u00a0and\u00a0<strong>fails<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>2.\u00a0 Hemodynamic Changes of Right-Sided CHF:<\/strong><\/h1>\n<ul>\n<li><strong>Blood backs up into systemic circulation<\/strong>:\n<ul>\n<li><strong>Vena cavae<\/strong>\u00a0(superior and inferior) become\u00a0<strong>engorged<\/strong>.<\/li>\n<li><strong>Increased pressure<\/strong>\u00a0causes\u00a0<strong>leakage<\/strong>\u00a0of exudate into tissues.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Edema formation:<\/strong>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><strong>Peripheral edema:<\/strong>\u00a0Legs, feet, ankles, and abdomen (<strong>ascites<\/strong>).<\/li>\n<li><strong>Jugular venous distension:<\/strong>\u00a0Swollen neck veins.<\/li>\n<li><strong>Hepatosplenomegaly:<\/strong> Enlarged liver and spleen due to vascular congestion (engorgement and pressure).<\/li>\n<li><strong>Digestive disturbances:<\/strong>\u00a0Loss of appetite, nausea, and abdominal discomfort.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Signs of systemic congestion:<\/strong>\u00a0Cyanosis, fatigue, and signs of hypoxia affecting organs.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1><strong>3.\u00a0 Cerebral &amp; Organ Effects of Right-Sided CHF:<\/strong><\/h1>\n<ul>\n<li><strong>Brain:<\/strong>\n<ul>\n<li>Increased\u00a0<strong>intracranial pressure<\/strong>\u00a0from edema.<\/li>\n<li>Reduced blood flow causes\u00a0<strong>hypoxia<\/strong>,\u00a0<strong>confusion<\/strong>, and potential\u00a0<strong>neurological damage<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Other tissues:<\/strong>\n<ul>\n<li>Impaired organ perfusion causes\u00a0<strong>fatigue<\/strong>,\u00a0<strong>weakness<\/strong>, and\u00a0<strong>tissue hypoxia<\/strong>.<\/li>\n<li>Signs include\u00a0<strong>pale skin<\/strong>,\u00a0<strong>cold extremities<\/strong>, and slow healing wounds.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1>4. Body&#8217;s Compensation of Right-Sided CHF:<\/h1>\n<ul>\n<li>Exactly the same as Body&#8217;s Compensation of Left-Sided CHF<\/li>\n<\/ul>\n<h1>CHF Treatment Strategies:<\/h1>\n<ul>\n<li><strong>Vasodilators:<\/strong>\n<ul>\n<li><strong>Alpha blockers<\/strong>\u00a0and\u00a0<strong>vasodilators<\/strong>\u00a0reduce systemic resistance.<\/li>\n<li><strong>Calcium channel blockers:<\/strong>\u00a0Promote vasodilation and decrease afterload.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Beta blockers:<\/strong>\u00a0Slow heart rate and decrease force of contraction, reducing workload.<\/li>\n<li><strong>Digoxin:<\/strong>\u00a0Increases contractility, helping the heart maintain stroke volume while reducing workload.<\/li>\n<li><strong>ACE inhibitors:<\/strong>\u00a0Block the formation of angiotensin II, reducing vasoconstriction and lowering blood pressure.<\/li>\n<li><strong>Diuretics:<\/strong>\u00a0Reduce blood volume and preload, easing the load on the heart.<\/li>\n<\/ul>\n<p>These treatments aim to <strong>reduce workload<\/strong>, improve <strong>heart efficiency<\/strong>, and <strong>slow disease progression<\/strong>.<\/p>\n<h1><strong>CHF Compensation &amp; Deterioration:<\/strong><\/h1>\n<ul>\n<li>While initially beneficial,\u00a0<strong>compensatory responses<\/strong>\u00a0<strong>increase workload<\/strong>\u00a0on the heart.<\/li>\n<li>Over time, these lead to\u00a0<strong>worsening heart failure<\/strong>\u00a0and\u00a0<strong>progressive deterioration<\/strong>.<\/li>\n<li>Long-term management involves addressing root causes, reducing workload, and preventing compound damage.<\/li>\n<\/ul>\n<h1><strong>Summary:<\/strong><\/h1>\n<p>Congestive heart failure involves inadequate cardiac output, leading to fluid retention, pulmonary congestion, or systemic edema depending on the side affected. The body\u2019s compensatory mechanisms support life temporarily but can accelerate disease progression. Management aims to optimize cardiac function, reduce workload, and prevent complications.<\/p>\n<p>Left-sided CHF begins with weakened left ventricle function, leading to pulmonary congestion and edema. Compensation mechanisms initially preserve perfusion but eventually worsen heart strain, promote hypertrophy, and cause systemic and pulmonary circulatory failure, often progressing to right-sided failure and widespread edema. Early detection and management are essential to interrupt this vicious cycle.\u00a0 Treatment aims to reduce preload, afterload, and myocardial workload, preventing progression and improving quality of life.<\/p>\n<p>Right-sided CHF results from primary right ventricular failure or secondary to left-sided failure or lung disease. It causes systemic venous congestion, peripheral edema, and organ hypoperfusion. The body compensates through neurohormonal activation, but long-term, this worsens cardiac hypertrophy and deteriorates heart function. Early detection and intervention are crucial to prevent progression to biventricular failure.<\/p>\n<p>CHF affects both sides of the heart, leading to pulmonary congestion or systemic edema depending on the failure side. The body\u2019s compensatory mechanisms initially support organ perfusion but ultimately contribute to worsening heart failure. Monitoring blood volume and pressures, along with managing symptoms and underlying causes, is crucial in treatment. An increase in atrial natriuretic peptide signifies severe or progressing heart failure.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"author":1370,"menu_order":29,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["zoe-soon"],"pb_section_license":"cc-by-nc-nd"},"chapter-type":[],"contributor":[60],"license":[58],"class_list":["post-5622","chapter","type-chapter","status-web-only","hentry","contributor-zoe-soon","license-cc-by-nc-nd"],"part":55,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5622","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\/5622\/revisions"}],"predecessor-version":[{"id":5633,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5622\/revisions\/5633"}],"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\/5622\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/media?parent=5622"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapter-type?post=5622"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/contributor?post=5622"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/license?post=5622"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}