Hepatic encephalopathy is caused by the liver's inability to remove which substance from the body?
Albumin.
Aldosterone.
Ammonia.
Bilirubin.
The Correct Answer is C
Choice A rationale
Albumin is the primary protein produced by the liver, responsible for maintaining oncotic pressure and transporting various substances in the bloodstream. In liver failure, albumin levels typically decrease, leading to edema and ascites. However, albumin is not a toxin, and its presence or absence does not cause the neurological symptoms associated with encephalopathy. The normal range for serum albumin is 3.5 to 5.0 g/dL, and its deficit is a marker of synthetic dysfunction rather than toxemia.
Choice B rationale
Aldosterone is a mineralocorticoid hormone produced by the adrenal glands that regulates sodium and potassium balance. While the liver is responsible for the metabolism and inactivation of aldosterone, and its buildup in liver disease contributes to fluid retention and ascites, it is not the primary neurotoxin responsible for hepatic encephalopathy. The neurological decline in liver disease is specifically tied to nitrogenous waste products that cross the blood-brain barrier, which is not a characteristic effect of elevated aldosterone.
Choice C rationale
Ammonia is a byproduct of protein metabolism produced by bacteria in the gut and by peripheral tissues. A healthy liver converts ammonia into urea for excretion by the kidneys. In hepatic failure, this conversion fails, leading to elevated blood ammonia levels, typically above the normal range of 15 to 45 micrograms/dL. Ammonia crosses the blood-brain barrier and causes astrocyte swelling and cerebral edema, which are the scientific hallmarks of the cognitive and motor deficits seen in encephalopathy.
Choice D rationale
Bilirubin is a yellow pigment formed during the normal breakdown of red blood cells. The liver processes bilirubin so it can be excreted. While impaired liver function leads to hyperbilirubinemia and jaundice, elevated bilirubin levels in adults do not typically cause the neurological changes seen in hepatic encephalopathy. The normal total bilirubin range is 0.1 to 1.2 mg/dL. While very high levels are toxic in neonates, ammonia remains the primary driver of encephalopathy in adult liver failure.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice D rationale
Dysrhythmias are the most common and immediate complication after a myocardial infarction. When heart muscle cells are damaged or die due to lack of oxygen, the electrical conduction system of the heart is disrupted. The ischemic tissue can become irritable, leading to abnormal electrical impulses. These can range from relatively harmless premature contractions to life-threatening rhythms like ventricular tachycardia or ventricular fibrillation, which are the leading causes of death in the early post-infarction period.
Choice A rationale
Endocarditis is an infection of the inner lining of the heart chambers and valves, usually caused by bacteria entering the bloodstream. While a myocardial infarction causes structural damage, it does not inherently introduce pathogens into the heart to cause an infection. Endocarditis is more commonly associated with intravenous drug use, dental procedures, or prosthetic heart valves. Myocardial infarction affects the muscular layer (myocardium) rather than the endocardial lining through an infectious process.
Choice B rationale
Hyperthyroidism is an endocrine disorder characterized by the overproduction of thyroid hormone by the thyroid gland. It is not a complication of a myocardial infarction. While hyperthyroidism can cause cardiac issues like tachycardia or atrial fibrillation which might strain the heart, the reverse is not true. A heart attack is a localized vascular and muscular event in the heart and has no pathophysiological mechanism that would cause the thyroid gland to increase its hormone production.
Choice C rationale
Rheumatic fever is an inflammatory disease that can develop as a complication of an untreated or inadequately treated strep throat infection caused by group A Streptococcus bacteria. It can lead to permanent damage to the heart valves, known as rheumatic heart disease. This process is entirely distinct from a myocardial infarction, which is caused by coronary artery occlusion and ischemia. There is no link between the necrosis of heart muscle and the autoimmune response triggered by a streptococcal infection.
Correct Answer is C
Explanation
Choice C rationale
Severe vomiting is a hallmark manifestation of a small intestine obstruction. When the flow of intestinal contents is blocked, fluid and gas accumulate proximal to the obstruction, leading to significant distention. This buildup triggers the vomiting reflex as the body attempts to decompress the gastrointestinal tract. If the obstruction is high in the small intestine, vomiting occurs early and is often profuse, leading to rapid electrolyte imbalances and dehydration due to the loss of gastric and intestinal secretions.
Choice A rationale
Increased hunger is not expected with a small intestine obstruction. In fact, most patients experience profound anorexia and nausea. As the bowel becomes distended and peristalsis struggles against the physical blockage, the feeling of fullness and abdominal pain completely suppresses the appetite. The presence of undigested material and the back-pressure within the digestive system make the thought of food repulsive to the patient, rather than stimulating a hunger response or an increase in caloric demand.
Choice B rationale
A decreased temperature is not a standard finding in bowel obstruction. Instead, patients may develop a fever if the obstruction leads to bowel ischemia, necrosis, or perforation resulting in peritonitis. An elevated temperature indicates an inflammatory or infectious process. A decreased temperature might only be seen in the very late stages of septic shock, but it is not a diagnostic or expected manifestation of the mechanical obstruction process itself during its initial clinical presentation.
Choice D rationale
Bradycardia, or a slow heart rate, is not typically associated with bowel obstruction. Instead, patients are much more likely to exhibit tachycardia, or a rapid heart rate. Tachycardia occurs as a compensatory response to the pain, stress, and fluid volume deficit caused by vomiting and the sequestration of fluid within the lumen of the obstructed bowel (third-spacing). The sympathetic nervous system is activated, increasing the heart rate to maintain cardiac output in the face of diminishing intravascular volume.
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