Which warning signs are associated with a myocardial infarction?
Dizziness.
Crushing chest pain.
Shortness of breath.
Feeling of dread.
Constipation.
Correct Answer : A,B,C,D
Choice A rationale
Dizziness is a frequent warning sign of myocardial infarction, occurring because the damaged heart muscle cannot pump blood efficiently. This leads to decreased cardiac output and reduced cerebral perfusion. When the brain receives insufficient oxygenated blood, the individual experiences lightheadedness or vertigo. This symptom is particularly common in women and older adults, who may present with atypical signs rather than the classic chest pressure associated with a heart attack.
Choice B rationale
Crushing chest pain, often described as a heavy pressure or a feeling of an elephant sitting on the chest, is the hallmark sign of a myocardial infarction. It results from severe myocardial ischemia where the lack of blood flow leads to cell death. This pain typically lasts more than 15 minutes and may radiate to the left arm, neck, or jaw. It is caused by the stimulation of nociceptors in the heart due to the buildup of metabolic waste.
Choice C rationale
Shortness of breath, or dyspnea, occurs during a myocardial infarction because the heart's pumping ability is compromised, leading to back-pressure in the pulmonary circulation. This causes fluid to shift into the alveoli, interfering with gas exchange. Additionally, the body attempts to compensate for reduced cardiac output by increasing the respiratory rate. Patients often feel they cannot catch their breath even while resting, reflecting the acute stress on both the cardiovascular and respiratory systems.
Choice D rationale
A feeling of impending dread or intense anxiety is a recognized psychological manifestation of a myocardial infarction. This is thought to be triggered by the massive release of sympathetic nervous system hormones, like adrenaline, as the body responds to the physiological crisis. This autonomic surge alerts the brain that something is critically wrong. This subjective symptom often precedes more objective clinical signs and should be taken seriously as a significant clinical indicator of cardiac distress.
Choice E rationale
Constipation is not a warning sign of an acute myocardial infarction. Constipation is a gastrointestinal issue related to bowel motility, fiber intake, or hydration status. In contrast, the systemic signs of a heart attack involve the cardiovascular, respiratory, and neurological systems. While some patients might experience nausea or epigastric distress that mimics indigestion, the slowing of bowel movements is not an acute indicator of the myocardial ischemia that characterizes a heart attack event.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice B rationale
Herniation refers to the displacement of brain tissue from its normal compartment into an adjacent space due to severely increased intracranial pressure. When the pressure within the cranium becomes excessive, the brain is forced toward the opening at the base of the skull, the foramen magnum. This specific type, tonsillar herniation, compresses the brain stem, which contains vital centers for respiratory and cardiac function, making it a critical and life-threatening medical emergency.
Choice A rationale
Cushing's triad is a clinical sign of significantly increased intracranial pressure rather than the physical displacement of brain tissue itself. It consists of three specific physiological changes: bradycardia, irregular respirations, and a widening pulse pressure with hypertension. While Cushing's triad often precedes or accompanies brain herniation, it describes the vital sign pattern caused by the pressure on the brain stem rather than the anatomical movement of the tissue through the foramen magnum.
Choice C rationale
Hydrocephalus is a condition characterized by an abnormal accumulation of cerebrospinal fluid within the ventricles of the brain. This buildup can increase intracranial pressure and potentially lead to herniation if left untreated, but it is the cause of the pressure rather than the term for the brain stem being pushed through the foramen magnum. Hydrocephalus describes the fluid dynamics issue, whereas herniation describes the resulting dangerous shifting of brain structures.
Choice D rationale
A stroke, or cerebrovascular accident, occurs when blood flow to a portion of the brain is interrupted by a clot or a rupture of a vessel. While a large stroke can cause significant cerebral edema and subsequent increased intracranial pressure that might lead to herniation, the term stroke specifically refers to the ischemic or hemorrhagic vascular event. It does not describe the mechanical process of brain tissue being forced through the openings of the skull.
Correct Answer is ["C","D","E"]
Explanation
Choice A rationale
Hypokalemia, where serum potassium is less than 3.5 mEq/L, is typically associated with metabolic alkalosis rather than acidosis. When potassium levels are low, the kidneys may exchange hydrogen ions for potassium to maintain electrical neutrality, or hydrogen ions may shift into the cells. This shift decreases the concentration of hydrogen ions in the extracellular fluid, raising the pH. Therefore, hypokalemia is a consequence or a companion of alkalosis, not a primary cause of metabolic acidosis.
Choice B rationale
Nasogastric suctioning removes highly acidic gastric secretions, which contain high amounts of hydrochloric acid. The loss of these hydrogen ions from the stomach leads to a relative increase in bicarbonate levels in the blood, resulting in metabolic alkalosis. Metabolic acidosis involves an excess of acid or a loss of base, which is the opposite of what occurs during gastric decompression. This procedure is a classic clinical cause for an elevated systemic pH and bicarbonate.
Choice C rationale
Starvation leads to metabolic acidosis through the production of ketones. When the body lacks sufficient glucose for energy, it begins to break down stored fats for fuel. This process, known as ketogenesis, produces acidic byproducts called ketoacids. As these acids accumulate in the bloodstream, they consume bicarbonate buffers, leading to a drop in blood pH below 7.35. This state is specifically referred to as starvation ketoacidosis, a form of high anion gap metabolic acidosis.
Choice D rationale
Diarrhea is a frequent cause of metabolic acidosis because lower intestinal secretions are rich in bicarbonate. When a person has significant diarrhea, they lose large amounts of base through the stool. The loss of bicarbonate shifts the acid-base balance toward the acidic side, as there is less buffer available to neutralize metabolic acids. This results in a normal anion gap metabolic acidosis, characterized by a decrease in serum bicarbonate levels below 22 mEq/L.
Choice E rationale
Renal failure causes metabolic acidosis because the kidneys are unable to excrete fixed metabolic acids or regenerate bicarbonate. Normally, the kidneys eliminate hydrogen ions and conserve base to maintain a pH between 7.35 and 7.45. In chronic or acute renal failure, acids like phosphates and sulfates accumulate in the blood. Additionally, the reduced ability to secrete ammonium ions impairs the total acid excretion capacity, leading to a systemic accumulation of acid and bicarbonate depletion.
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