Infections unresponsive to therapy due to poor blood supply most commonly involve which structure?

Infections unresponsive to therapy due to poor blood supply most commonly involve which structure?

• A. Costal Cartilage
• B. Lung Pleura
• C. Intercostal Muscles
• D. Diaphragm

Answer: (A)

Infections that persist despite therapy are most likely to involve tissues with very poor blood supply, because limited blood flow means low antibiotic delivery and reduced immune cell access. Costal cartilage fits this description perfectly: it is avascular, lacking its own blood vessels, and relies on diffusion from surrounding tissues for nutrients and immune defense. This makes it tough for antibiotics to reach effective concentrations there, so infections in the costal cartilage are notoriously difficult to eradicate. In contrast, intercostal muscles, the lung pleura, and the diaphragm have richer blood supplies, so infections in those structures are generally more responsive to treatment.

Infections that persist despite therapy are most likely to involve tissues with very poor blood supply, because limited blood flow means low antibiotic delivery and reduced immune cell access. Costal cartilage fits this description perfectly: it is avascular, lacking its own blood vessels, and relies on diffusion from surrounding tissues for nutrients and immune defense. This makes it tough for antibiotics to reach effective concentrations there, so infections in the costal cartilage are notoriously difficult to eradicate. In contrast, intercostal muscles, the lung pleura, and the diaphragm have richer blood supplies, so infections in those structures are generally more responsive to treatment.