A patient with left heart failure starts to have a cough and dyspnea. Pulmonary symptoms common to left heart failure are a result of:
Decreased cardiac output.
Bronchoconstriction.
Inflammatory pulmonary edema.
Pulmonary vascular congestion.
The Correct Answer is D
Choice A reason: This is not the cause of pulmonary symptoms in left heart failure. Decreased cardiac output is a consequence of left heart failure, which affects the perfusion of vital organs and tissues.
Choice B reason: This is not the cause of pulmonary symptoms in left heart failure. Bronchoconstriction is a feature of asthma and chronic obstructive pulmonary disease (COPD), which affect the airways and cause wheezes and shortness of breath.
Choice C reason: This is not the cause of pulmonary symptoms in left heart failure. Inflammatory pulmonary edema is a type of non-cardiogenic pulmonary edema, which occurs when the alveolar-capillary membrane is damaged by an inflammatory process, such as pneumonia or sepsis.
Choice D reason: This is the correct cause of pulmonary symptoms in left heart failure. Pulmonary vascular congestion is a result of increased pressure in the pulmonary circulation, which occurs when the left ventricle fails to pump blood effectively to the aorta and the rest of the body. This causes fluid to leak into the alveoli and interstitial spaces, leading to cough, dyspnea, crackles, and pink frothy sputum.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: The cells of the myocardium become hypertrophic in response to increased workload or pressure, not as a result of myocardial infarction. Hypertrophy is an adaptive mechanism that can lead to impaired ventricular function over time.
Choice B reason: The resulting hypoxia leads to ischemic injury and myocardial cell death. This is the main cause of impaired ventricular function after a myocardial infarction. The loss of viable myocardial tissue reduces the contractility and pumping ability of the heart.
Choice C reason: There is a temporary alteration in electrolyte balance that can be corrected. This is not the primary cause of impaired ventricular function after a myocardial infarction. Electrolyte imbalance can occur due to fluid loss, renal impairment, or medication side effects, but it can be managed with appropriate interventions.
Choice D reason: There is too much pressure on the heart and the ventricles begin to dysfunction. This is not the direct cause of impaired ventricular function after a myocardial infarction. Increased pressure on the heart can result from hypertension, valvular disease, or pulmonary embolism, but it is not related to myocardial ischemia or necrosis.
Correct Answer is B
Explanation
Choice A reason: Respiratory acidosis does not cause no change in affinity of hemoglobin with oxygen. It causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. This is known as the Bohr effect, which is a physiological response to low pH and high CO2 levels.
Choice B reason: Respiratory acidosis causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. This is the correct statement that describes the expected finding in this patient. The decrease in affinity of hemoglobin with oxygen is a compensatory mechanism that tries to restore the oxygen balance in the body.
Choice C reason: Respiratory acidosis does not cause an increase in affinity of hemoglobin with oxygen. It causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. An increase in affinity of hemoglobin with oxygen would mean that hemoglobin holds on to oxygen more tightly, which would worsen the hypoxia in the patient.
Choice D reason: Respiratory acidosis does not cause a decrease in blood CO2. It causes an increase in blood CO2, which is the primary cause of the low pH. A decrease in blood CO2 would indicate respiratory alkalosis, which is a condition of high pH and low CO2 levels.
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