What factor(s) place a person at risk for inadequate perfusion? Select all that apply.
Hypertension.
Advanced age.
Tobacco use.
Hyperlipidemia.
Diabetes mellitus.
Correct Answer : A,B,C,D,E
Choice A rationale
Hypertension increases the risk for inadequate perfusion by causing structural changes in the blood vessels, such as thickening and loss of elasticity. High pressure damages the endothelial lining, leading to atherosclerosis. This narrowing of the arteries restricts the delivery of oxygenated blood to vital organs and tissues. Over time, chronic hypertension can lead to heart failure, where the pump becomes too weak or stiff to maintain adequate systemic circulation, further compromising overall tissue perfusion.
Choice B rationale
Advanced age is a significant risk factor for inadequate perfusion due to the natural physiological changes in the cardiovascular system. As people age, their arteries tend to become stiffer and less compliant, a process known as arteriosclerosis. Additionally, the heart muscle may become less efficient, and there is often a decrease in capillary density. These changes collectively reduce the body's ability to adjust blood flow in response to metabolic demands, increasing the vulnerability to ischemic events.
Choice C rationale
Tobacco use is a major contributor to poor perfusion because nicotine is a potent vasoconstrictor that immediately reduces blood flow. Furthermore, the chemicals in tobacco smoke cause chronic inflammation and oxidative stress, which accelerate the development of atherosclerotic plaques. Smoking also increases the level of carbon monoxide in the blood, which binds to hemoglobin and reduces the amount of oxygen available for tissue delivery. This combination of vessel narrowing and reduced oxygen capacity severely impairs perfusion.
Choice D rationale
Hyperlipidemia, specifically high levels of low-density lipoprotein cholesterol, leads to the formation of plaques within the arterial walls. This process, atherosclerosis, progressively narrows the lumen of the vessels, reducing the volume of blood that can pass through. If a plaque ruptures, it can cause an acute blockage, leading to a myocardial infarction or stroke. Even without rupture, the chronic narrowing ensures that tissues downstream receive insufficient blood flow, especially during periods of increased physical activity.
Choice E rationale
Diabetes mellitus impairs perfusion through both macrovascular and microvascular complications. Chronic hyperglycemia damages the basement membrane of small blood vessels and promotes systemic inflammation. This leads to peripheral vascular disease and neuropathy. The impaired circulation is often most evident in the extremities, where decreased blood flow and nerve damage increase the risk of ulcers and infection. Diabetes also accelerates atherosclerosis in larger vessels, further compromising the delivery of oxygen and nutrients to the entire body.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Infants have a much higher body surface area to volume ratio compared to adults. This physiological characteristic means that a larger proportion of their total body water is in contact with the environment, allowing for rapid fluid loss through the skin via evaporation. Because infants have more skin surface relative to their small body mass, even minor increases in environmental temperature or respiratory rate can lead to significant fluid deficits, making them scientifically more prone to rapid dehydration.
Choice B rationale
Subcutaneous fat actually serves as an insulating layer and does not increase the risk of dehydration. In fact, adipose tissue has a lower water content than muscle tissue, but its presence does not predispose an infant to fluid loss. Infants typically have a higher percentage of total body water, approximately 75 percent, compared to adults. The risk of dehydration is related to how that water is distributed and lost, not the amount of subcutaneous fat present on the infant's body.
Choice C rationale
Forgetfulness regarding fluid intake is a behavioral risk factor often associated with the elderly or older children, but it is not applicable to infants. Infants rely entirely on caregivers for fluid administration and cannot consciously choose or forget to drink. Their risk for dehydration is primarily driven by physiological and anatomical factors, such as their high metabolic rate and immature renal function, which limit their ability to concentrate urine and conserve water when fluid intake is insufficient.
Choice D rationale
The sweat mechanism in infants is actually immature and less efficient than in adults. Infants do not sweat as effectively to dissipate heat, which puts them at a higher risk for overheating rather than dehydration specifically through sweating. While they do lose fluid through the skin, the primary issue is the high surface area to volume ratio and a higher respiratory rate, which increases insensible water loss, rather than an overactive or increased sweat mechanism compared to older individuals.
Correct Answer is D
Explanation
Choice D rationale
A panic attack typically involves hyperventilation, where the person breathes rapidly and deeply. This causes them to blow off excessive amounts of carbon dioxide (CO2). According to the arterial blood gas values, a low PaCO2 (less than 35 mmHg) leads to an increase in pH (greater than 7.45), resulting in respiratory alkalosis. Choice D shows a pH of 7.49 and a PaCO2 of 28 mmHg, with a normal HCO3 of 24 mEq/L, which perfectly illustrates the acute respiratory alkalosis expected during hyperventilation.
Choice A rationale
Choice A represents a state of mild metabolic acidosis or a near-normal result, with a pH of 7.34 and a PaCO2 of 45 mmHg. In a panic attack, the primary change is a decrease in CO2 due to rapid breathing, not an increase or a drop in pH. This profile suggests the body is retaining too much acid or losing base, which is the physiological opposite of what happens when a person hyperventilates during an episode of intense acute anxiety or panic.
Choice B rationale
Choice B reflects respiratory acidosis, indicated by a low pH of 7.32 and an elevated PaCO2 of 49 mmHg. This occurs in conditions where ventilation is inadequate, such as chronic obstructive pulmonary disease or respiratory depression, leading to the retention of carbon dioxide. In a panic attack, the person is over-ventilating, not under-ventilating, so the PaCO2 should be low and the pH should be high, making this result incorrect for the described clinical scenario.
Choice C rationale
Choice C shows a pH of 7.46 and an HCO3 of 28 mEq/L with a normal PaCO2. This indicates metabolic alkalosis. While the pH is high, the cause is an excess of bicarbonate rather than a deficit of carbon dioxide. In a panic attack, the alkalosis is driven by the respiratory system (low PaCO2) rather than a metabolic gain of base. Therefore, this result does not align with the rapid breathing and CO2 loss characteristic of a panic-induced hyperventilation event. .
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