A patient is experiencing low blood pressure (hypotension). The nurse understands that factors that may contribute to hypotension include which of the following? (Select All That Apply)
High fiber diet.
Dehydration.
High sodium intake.
Decreased cardiac output.
Blood loss.
Correct Answer : B,D,E
Choice A rationale
A high fiber diet is associated with improved digestive health and a lower risk of chronic diseases like cardiovascular disease and type 2 diabetes. While it can help lower blood pressure in hypertensive patients over the long term, it does not cause acute hypotension. Fiber primarily affects glucose absorption and cholesterol levels. It does not significantly alter the immediate hemodynamic variables such as blood volume or cardiac contractility that are necessary to cause a clinical state of low blood pressure.
Choice B rationale
Dehydration leads to a decrease in total circulating blood volume, known as hypovolemia. When the intravascular volume drops, there is less blood filling the heart, which decreases stroke volume and subsequently reduces blood pressure. The body may attempt to compensate with tachycardia, but if the fluid loss is significant, hypotension ensues. Normal fluid intake varies, but clinical signs of dehydration include dry mucous membranes and poor skin turgor. Maintaining adequate hydration is critical for maintaining a stable, normal blood pressure.
Choice C rationale
High sodium intake is a well-known risk factor for hypertension, not hypotension. Sodium causes the body to retain water, which increases the total blood volume and places more pressure on the arterial walls. Excessive sodium intake can lead to edema and strain on the cardiovascular system. Reducing sodium intake is a standard recommendation for managing high blood pressure. In contrast, hypotension is sometimes treated with increased salt intake in specific conditions like orthostatic hypotension or certain dysautonomias.
Choice D rationale
Cardiac output is the product of heart rate and stroke volume. If the heart cannot pump effectively due to heart failure, myocardial infarction, or arrhythmias, the cardiac output falls. Since blood pressure is equal to cardiac output multiplied by systemic vascular resistance, a decrease in cardiac output directly leads to a decrease in blood pressure if the resistance does not increase enough to compensate. Normal cardiac output for an adult is typically between 4 to 8 liters per minute.
Choice E rationale
Blood loss, or hemorrhage, causes a rapid decrease in the volume of blood within the circulatory system. This acute hypovolemia reduces the amount of blood returning to the heart, which lowers the preload and the resulting stroke volume. If the loss is substantial, the body can no longer maintain adequate perfusion pressure, resulting in hypotension and potentially hypovolemic shock. Hemoglobin levels normally range from 12 to 16 g/dL in women and 14 to 18 g/dL in men; significant drops indicate blood loss.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Valvular prolapse, most commonly seen in the mitral valve, occurs when the valve leaflets become enlarged or floppy. During ventricular contraction, these leaflets do not close evenly and instead bulge or sink backward into the atrium. This can sometimes allow a small amount of blood to leak backward, known as regurgitation. The condition is often due to myxomatous degeneration of the connective tissue within the valve structures, leading to their abnormal shape.
Choice B rationale
A heart valve that becomes stiff and cannot open properly is the definition of valvular stenosis. In stenosis, the valve leaflets may become calcified or scarred, narrowing the opening and forcing the heart to work harder to pump blood through the restricted orifice. This is a different mechanical failure than prolapse, where the issue is the failure of the valve to stay closed and supported during the high-pressure phase of the cardiac cycle.
Choice C rationale
The chordae tendineae are the "heart strings" that normally prevent the valve leaflets from prolapsing. In the case of prolapse, these structures may actually be elongated or weakened, failing to provide the necessary tension to hold the leaflets in place. If they were to pull the valve tightly closed, it would represent normal function. Prolapse represents a failure of these supporting structures to maintain the proper position of the valve under pressure.
Choice D rationale
While a blood clot can interfere with heart function, it is not the mechanism for valvular prolapse. A clot on a valve, known as a vegetation in the context of infection or a thrombus, can cause an embolism or obstruction, but it does not cause the structural "floppiness" associated with prolapse. Prolapse is a structural and mechanical deformity of the valve tissue itself rather than a complication caused by an external obstructive mass.
Correct Answer is B
Explanation
Choice A rationale
Afterload represents the resistance or pressure against which the ventricles must pump to eject blood during systole. It is determined largely by systemic vascular resistance and aortic pressure. While afterload influences the volume of blood ejected, it does not define the total volume pumped over a sixty second interval. High afterload can decrease stroke volume and eventually lead to cardiac hypertrophy or failure if the compensatory mechanisms of the myocardium are overwhelmed by chronic stress.
Choice B rationale
Cardiac output is the total volume of blood pumped by a ventricle into the circulation over a period of one minute. It is calculated by multiplying the stroke volume by the heart rate. Normal resting cardiac output for an adult is approximately 4 to 8 liters per minute. This parameter is a critical indicator of how well the heart functions as a pump to meet the metabolic demands and oxygen requirements of the body tissues and organs.
Choice C rationale
Stroke volume refers to the amount of blood ejected from the left ventricle with each individual contraction or heartbeat. It is the difference between end-diastolic volume and end-systolic volume. While it is a major component used to calculate cardiac output, it only measures the volume per single beat rather than the cumulative volume over a full minute. Normal stroke volume ranges from 60 to 100 milliliters per beat in a healthy adult at rest.
Choice D rationale
Systole is the phase of the cardiac cycle during which the heart muscle contracts and pumps blood from the chambers into the arteries. It is a temporal phase rather than a volumetric measurement. During ventricular systole, the mitral and tricuspid valves close while the aortic and pulmonic valves open. This phase is essential for circulation, but the term itself does not quantify the specific volume of blood moved during a specific one minute timeframe.
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