Order: 150 mg PO. Available: 100 mg tablets.

How many tablets will the nurse administer? . . .

Choice A rationale

Synthesizing immunoglobulins is a specialized function of plasma cells, which are derived from B lymphocytes. Platelets do not possess the cellular machinery or genetic programming to produce antibodies. While platelets interact with the immune system, their role is centered on inflammatory signaling and coagulation rather than the adaptive immune response characterized by immunoglobulin production. Therefore, this choice misattributes the specific function of the humoral immune system to these small, anucleated blood fragments.

Choice B rationale

Activating cytotoxic T lymphocytes is a complex process involving antigen presentation by cells like macrophages or dendritic cells, supported by helper T cells. Platelets do not act as primary activators of the cellular immune response in this manner. Their influence on T cells is indirect, mediated through the release of cytokines and growth factors. They do not directly engage in the MHC-dependent activation pathways required to turn a naive T cell into a cytotoxic effector cell.

Choice C rationale

Platelets contain alpha granules and dense granules that store a variety of bioactive substances. Upon activation at a site of injury or infection, they release chemical mediators such as serotonin, histamine, and various cytokines. These substances increase vascular permeability and recruit leukocytes to the area, effectively amplifying the inflammatory response. This bridge between hemostasis and inflammation allows platelets to actively modulate the early stages of the innate immune response beyond just forming a clot.

Choice D rationale

While some research suggests that platelets can internalize certain bacteria, they are not classified as professional phagocytes like neutrophils or macrophages. Their primary contribution to defense is the release of antimicrobial peptides and the entrapment of pathogens within fibrin webs during the clotting process. They do not possess the extensive lysosomal systems required to efficiently digest and neutralize invading microorganisms through traditional phagocytosis. Their inflammatory role is primarily secretomotor and signaling in nature. .

Choice A rationale

Apoptosis is the process of programmed cell death used to remove damaged cells without causing an inflammatory response. In this clinical scenario, the client is exhibiting signs of an active, escalating infection and systemic inflammation rather than a controlled apoptotic process. The presence of a high white blood cell count of 16,200/mm and 10 percent bands suggests an acute shift toward necrosis and systemic activation rather than localized apoptotic pathways intended to limit damage.

Choice B rationale

Systemic inflammatory response syndrome involves the massive release of cytokines like tumor necrosis factor and interleukins into the bloodstream. These mediators cause widespread peripheral vasodilation to increase blood flow to tissues, but this results in a drop in blood pressure. The normal blood pressure varies, but a downward trend from a baseline of 120/80 mmHg toward hypotension indicates that these systemic cytokines are causing vascular relaxation and a significant decrease in systemic vascular resistance.

Choice C rationale

Inflammatory mediators increase the size of the gaps between endothelial cells in the capillaries. This allows protein-rich fluid to leak from the intravascular space into the interstitial space, known as third spacing. This process reduces the effective circulating blood volume, contributing to the client's declining blood pressure and localized edema. Normal capillary function maintains fluid balance, but during systemic inflammation, this permeability becomes global, leading to potential organ dysfunction and further hemodynamic instability in the client.

Choice D rationale

In the early stages of systemic inflammation and distributive shock, the systemic vascular resistance actually decreases due to vasodilation. The body typically attempts to compensate by increasing cardiac output via an increased heart rate to maintain perfusion. A decrease in cardiac output usually occurs later if the heart muscle becomes depressed by inflammatory toxins. The current assessment of trending down blood pressure is primarily driven by low resistance and fluid loss, not by an increase in resistance.

Choice E rationale

Neutrophils are the first responders to bacterial invasion and puncture wounds. They migrate to the injury site through chemotaxis and undergo degranulation to release antimicrobial enzymes. The client's white blood cell count of 16,200/mm is above the normal range of 5,000 to 10,000/mm, and the 10 percent bands indicate a left shift. This signifies that the bone marrow is releasing immature neutrophils to keep up with the significant demand of the escalating infection. .