A nurse is assessing a client's postoperative incision that was closed with sutures.
The wound edges are well-approximated, and healing is occurring with minimal tissue loss and little to no scarring.
Which type of wound healing does this describe?
Healing by secondary intention.
Healing by tertiary intention.
Healing by granulation.
Healing by primary intention.
The Correct Answer is D
Choice A rationale
Healing by secondary intention occurs when a wound has a great deal of tissue loss and the edges cannot be brought together, such as in a pressure ulcer or a large laceration. These wounds are left open to heal from the bottom up through the formation of granulation tissue. This process results in a much longer healing time, a higher risk of infection, and the development of significant scar tissue, which does not match the description provided.
Choice B rationale
Healing by tertiary intention, also known as delayed primary closure, occurs when a wound is intentionally left open for several days to allow edema or infection to resolve before being surgically closed with sutures or staples. This method is used for contaminated wounds to ensure they are clean before final closure. While it eventually involves sutures, the initial delay and the nature of the wound usually result in more scarring than what is seen in primary intention.
Choice C rationale
Healing by granulation is a key component of secondary intention healing. Granulation tissue is the red, moist tissue composed of new blood vessels and connective tissue that fills in the gap of an open wound. While all wounds involve some level of cellular repair, a wound that heals primarily through the accumulation of granulation tissue typically involves significant tissue gaps and will eventually result in a visible scar, unlike the well-approximated postoperative incision described here.
Choice D rationale
Healing by primary intention occurs when the edges of a clean surgical incision are well-approximated using sutures, staples, or adhesive. In this process, there is minimal tissue loss and the repair mechanisms can quickly bridge the small gap. This leads to rapid healing with a very low risk of infection and minimal to no scarring. The description of a postoperative incision with well-approximated edges that heals with little tissue loss perfectly fits the criteria for primary intention.
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Correct Answer is C
Explanation
Choice C rationale
Graves' disease is an autoimmune condition characterized by thyroid-stimulating immunoglobulins that continuously activate the TSH receptors. When this state is exacerbated by stress, infection, or trauma, it can lead to a thyroid storm. This involves a massive, sudden release of triiodothyronine (T3) and thyroxine (T4) into the circulation. These hormones significantly increase the basal metabolic rate, resulting in severe hyperthermia, tachycardia, and central nervous system agitation. This hypermetabolic state is life-threatening and requires immediate clinical intervention.
Choice B rationale
A sudden decrease in thyroid hormone production would lead to symptoms of hypothyroidism or, in extreme cases, myxedema coma. Myxedema coma is characterized by hypothermia, bradycardia, and depressed mental status, which is the exact opposite of the fever, tachycardia, and confusion seen in this patient. In Graves' disease, the pathology is driven by overactivity of the gland. Therefore, a decrease in hormone levels would not explain the acute hypermetabolic presentation described in the scenario of a thyroid storm.
Choice A rationale
Autoimmune destruction of thyroid tissue is the primary pathophysiology of Hashimoto thyroiditis, which eventually results in hypothyroidism. While Graves' disease is autoimmune, it is stimulatory rather than destructive. In Graves', antibodies mimic TSH and cause the gland to enlarge and overproduce hormones. If the tissue were being destroyed, the patient would not have the excessive levels of T3 and T4 necessary to drive the acute, high-energy symptoms of fever and tachycardia that characterize an untreated or exacerbated hyperthyroid state.
Choice D rationale
In Graves' disease, TSH secretion from the pituitary is already suppressed to near-zero levels because the high levels of circulating T3 and T4 provide constant negative feedback. While decreased TSH is a diagnostic finding (normal: 0.5 to 5.0 mU/L), it is a result of the disease rather than the cause of the acute crisis. The symptoms of tachycardia and fever are driven by the peripheral actions of the thyroid hormones themselves on the heart and thermoregulatory centers, not the pituitary's TSH levels.
Correct Answer is C
Explanation
Choice A rationale
Increased bicarbonate excretion would be an appropriate compensation for metabolic alkalosis, not metabolic acidosis. In metabolic acidosis, the body is experiencing a deficit of base or an excess of hydrogen ions. The renal system attempts to compensate by retaining bicarbonate and excreting hydrogen ions to raise the pH. Excreting more bicarbonate would worsen the acidic state by further depleting the body of its primary buffer system, leading to a dangerous drop in pH.
Choice B rationale
A decreased respiratory rate would lead to the retention of carbon dioxide, which combines with water to form carbonic acid. This process increases the concentration of hydrogen ions in the blood, leading to respiratory acidosis. If a client is already in metabolic acidosis, slowing the breathing would be a maladaptive response that causes a combined acid-base disorder. Respiratory compensation for an acidic state must involve increasing the removal of volatile acids to normalize blood pH.
Choice C rationale
In metabolic acidosis, the body compensates by increasing the respiratory rate and depth, often referred to as Kussmaul respirations. This physiological response facilitates the rapid removal of carbon dioxide from the lungs. Since carbon dioxide acts as a volatile acid in the bloodstream, lowering its partial pressure helps to increase the overall pH back toward the normal range of 7.35 to 7.45. This respiratory compensation occurs quickly to offset the primary metabolic imbalance.
Choice D rationale
Oxygen saturation is a measure of the percentage of hemoglobin binding sites occupied by oxygen and is not a direct compensatory mechanism for acid-base imbalances. While severe acidosis can shift the oxyhemoglobin dissociation curve and affect how easily oxygen is released to tissues, a decrease in saturation does not serve to neutralize excess hydrogen ions. Compensation involves specific adjustments in the partial pressure of carbon dioxide or the concentration of bicarbonate to stabilize pH levels.
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