Cardiogenic shock occurs when the heart's pumping ability is compromised. What can impair the pumping ability of the heart? Select all that apply.
Myocardial infarction
Cardiac tamponade
Severe bradycardia
Tension pneumothorax
Massive pulmonary embolism
Correct Answer : A,B,C,D,E
Choice A reason:
Myocardial infarction (MI) directly affects the heart muscle's ability to contract effectively. When part of the heart muscle is damaged due to a lack of oxygen, it cannot pump blood efficiently, leading to cardiogenic shock. This impaired contractility reduces cardiac output and blood pressure, causing inadequate perfusion of tissues.
Choice B reason:
Cardiac tamponade occurs when fluid accumulates in the pericardial sac surrounding the heart, compressing it and limiting its ability to fill and pump blood. This leads to decreased cardiac output and can cause cardiogenic shock. The heart cannot expand properly to accommodate blood flow, severely impairing its function.
Choice C reason:
Severe bradycardia, an abnormally slow heart rate, can reduce the heart's ability to pump sufficient blood to meet the body's needs. When the heart rate is too slow, the volume of blood ejected with each beat (cardiac output) decreases, potentially leading to cardiogenic shock if the body's demand for oxygen is not met.
Choice D reason:
Tension pneumothorax, a condition where air enters the pleural space and cannot escape, leads to increased pressure on the heart and great vessels. This pressure prevents the heart from filling properly, reducing cardiac output and impairing its pumping ability. If not promptly treated, tension pneumothorax can cause cardiogenic shock due to compromised heart function.
Choice E reason:
Massive pulmonary embolism, a blockage in the pulmonary arteries, hinders blood flow from the right side of the heart to the lungs. This obstruction increases the workload on the right ventricle, potentially leading to right ventricular failure and cardiogenic shock. The heart struggles to pump blood through the blocked pulmonary circuit, resulting in decreased cardiac output and shock.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason:
Hypotension, or low blood pressure, is a common feature in all types of shock, including hypovolemic, cardiogenic, and septic shock. It is not specific to neurogenic shock and therefore does not help in distinguishing it from other forms of shock.
Choice B reason:
A change in mental status, such as confusion or decreased consciousness, can occur in many types of shock due to decreased cerebral perfusion. This symptom is not unique to neurogenic shock and can be seen in hypovolemic, cardiogenic, and septic shock as well.
Choice C reason:
Bradycardia, or a slow heart rate, is a hallmark of neurogenic shock. This occurs due to disruption of the sympathetic nervous system, which normally maintains a higher heart rate through sympathetic stimulation. In neurogenic shock, the loss of sympathetic tone leads to unopposed parasympathetic activity, resulting in bradycardia. This is in contrast to other forms of shock, which typically present with tachycardia.
Choice D reason:
Warm, edematous skin is not typically associated with neurogenic shock. This symptom may be more relevant in septic shock, where widespread vasodilation can lead to warm skin. However, it is not specific enough to distinguish neurogenic shock from other types of shock.
Correct Answer is D
Explanation
Choice A reason:
Anorexia and nausea are common symptoms in many illnesses, including septic shock, but they are not specific late signs. These symptoms can occur early in the disease process and are not definitive indicators of the severity of the condition.
Choice B reason:
Generalized malaise, a feeling of overall discomfort and fatigue, is a nonspecific symptom that can occur in many conditions, including septic shock. It is not a specific late sign and can be present at various stages of the illness.
Choice C reason:
Slowed, shallow respirations can be a sign of respiratory failure, which can occur in severe sepsis or septic shock. However, it is not a specific late sign of septic shock itself. Respiratory patterns can vary depending on the underlying cause and progression of the shock.
Choice D reason:
Decreased temperature, or hypothermia, is a late sign of septic shock. As the body’s compensatory mechanisms fail, the ability to maintain normal body temperature is impaired. This can result in hypothermia, indicating severe and advanced septic shock. The body's metabolic processes slow down, and the overall prognosis becomes poorer as hypothermia sets in.
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