Secondary bacterial infections in intensive cardiac care settings necessitate a transition toward automated bedside screening systems. To understand the mechanics behind these devices, this paper reviews the foundational physics of light-guiding pathways, solid-state circuits, and nanoscale layers. Integrating these engineering frameworks enables clinical teams to clearly track sensitive patient immune responses. In practice, the platform evaluates a patient's host defense status by measuring local C-reactive protein (CRP) and procalcitonin levels. Time is critical; traditional laboratory cultures require two full days to yield results, thereby squandering the narrow therapeutic window available during sudden coronary emergencies. Rapid-onset sepsis poses a severe threat to vulnerable cardiac patients, directly increasing hospital mortality rates. While high production costs and sensor fouling from whole-blood samples remain engineering bottlenecks that slow widespread clinical deployment, their potential is significant. Ultimately, linking decentralized electronic networks with localized testing instruments simplifies hospital logistics and protects at-risk patients during acute medical crises.