A nurse is attending to a patient in the intensive care unit.
For each patient finding below, indicate whether the finding is consistent with fluid overload or dehydration in burn patients.
Increased Heart Rate.
Decreased Urine Output.
Elevated Blood Urea Nitrogen (BUN).
Decreased Hematocrit.
The Correct Answer is {"A":{"answers":"B"},"B":{"answers":"B"},"C":{"answers":"B"},"D":{"answers":"A"}}
Tachycardia in the burn patient frequently signals a deficit in circulating blood volume. When the vascular space loses fluid due to increased capillary permeability, the stroke volume decreases significantly. To compensate and maintain an adequate cardiac output, the sinoatrial node increases the firing rate. While pain or stress can raise the heart rate, a sustained increase in the absence of adequate fluid resuscitation is a classic indicator of systemic dehydration or hypovolemic shock.
Renal perfusion is highly sensitive to changes in mean arterial pressure and total intravascular volume. In a state of dehydration or inadequate fluid resuscitation after a burn, the kidneys conserve water by activating the renin-angiotensin-aldosterone system. This results in a marked decrease in urine output, often falling below the standard minimum of 0.5 mL per kg per hour. Low output reflects a physiological attempt to maintain blood pressure despite the massive fluid shifts and losses.
Blood Urea Nitrogen measures the concentration of nitrogenous waste in the blood. In dehydration, the kidneys reabsorb more water, which leads to a higher concentration of urea in the plasma. Normal BUN levels typically range from 7 to 20 mg/dL. When the patient is dehydrated, this value rises because there is less solvent available to dilute the solute. This elevation is a primary biochemical marker used to assess the severity of fluid volume deficits.
Hematocrit measures the percentage of red blood cells relative to total blood volume. In fluid overload, the intravascular space is expanded with excess plasma or intravenous fluids, which dilutes the cellular components of the blood. This hemodilution causes the hematocrit percentage to drop below the normal range, which is approximately 42 to 52 percent for men and 37 to 47 percent for women. This finding helps distinguish excessive fluid administration from the hemoconcentration seen in early burns.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Maintaining a urine output of 30 to 50 mL per hour is the gold standard indicator that fluid resuscitation is effectively restoring organ perfusion. This volume suggests that the kidneys are receiving enough blood to maintain a normal glomerular filtration rate. In burn patients, adequate urine production confirms that the intravascular volume has been sufficiently replaced to overcome the massive fluid shifts and capillary leak syndrome that occur immediately following a significant thermal injury.
Choice B rationale
A heart rate greater than 120 beats per minute is usually an indicator of ongoing stress, pain, or hypovolemia rather than successful resuscitation. Tachycardia suggests that the heart is still working excessively hard to maintain cardiac output in the face of low blood volume. A successful resuscitation should ideally lead to a stabilization of the heart rate towards a more normal range, typically below 110 beats per minute, as the intravascular volume is restored and sympathetic drive decreases.
Choice C rationale
While some weight gain is expected during the acute phase of burn care due to the administration of large volumes of crystalloid fluids and subsequent edema, an increase of 5 percent is not a specific indicator of successful resuscitation. Excessive weight gain can actually signal fluid overload or third-spacing rather than effective intravascular volume replacement. The goal of resuscitation is to support vital organ function with the least amount of fluid necessary, avoiding complications like pulmonary edema.
Choice D rationale
Decreased peripheral pulses are a concerning sign that may indicate inadequate systemic perfusion or localized compartment syndrome due to circumferential burns and excessive edema. Successful fluid resuscitation should result in the maintenance or improvement of peripheral pulses, indicating that blood is reaching the distal extremities. If pulses are weakening, it suggests that the circulatory status is deteriorating or that fluid is accumulating in the interstitial spaces so severely that it is compressing the arterial flow.
Correct Answer is A
Explanation
Choice A rationale
Safety during mobility is the most critical factor for discharge after a major orthopedic procedure like a hip arthroplasty. The ability to navigate stairs safely demonstrates sufficient muscle strength, balance, and adherence to weight-bearing restrictions. This functional independence is vital to prevent falls and hip dislocations in the home environment. Without this skill, the patient is at high risk for readmission and serious injury, making it the priority assessment before leaving the facility.
Choice B rationale
While pain management is important, expecting a patient to be completely independent of all pain medication shortly after a total hip replacement is unrealistic. Most patients will require a combination of around-the-clock non-opioids and as-needed medications to maintain comfort and facilitate physical therapy. The goal is controlled pain that allows for movement, not the total absence of medication. Therefore, this is not a mandatory or realistic criterion for immediate discharge.
Choice C rationale
Complete healing of a surgical wound takes weeks or months as the tissue goes through the proliferative and remodeling phases. At the time of discharge, which is often a few days post-surgery, the incision should be clean, dry, and intact with no signs of infection like purulent drainage or excessive redness. Expecting a completely healed wound site before discharge is not standard practice and would unnecessarily prolong the hospital stay beyond what is medically required.
Choice D rationale
Understanding the need for follow-up care is an important part of the discharge teaching plan, but it is not as critical as the patient's immediate physical safety and mobility. While knowing to see the surgeon in six months is helpful for long-term monitoring of the prosthetic joint, it does not address the immediate postoperative risks the patient faces in the first few days at home. Physical stability and safety always take precedence over long-term scheduling.
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