BoardVitals Microbiology Practice Test 2025 – Complete Exam Prep Resource

In patients with peripheral artery disease (PAD), dry gangrene is the most frequent type of infection encountered. This condition arises due to reduced blood flow to the extremities, which is a hallmark of PAD. The lack of sufficient blood supply means that tissues do not receive an adequate amount of oxygen and nutrients, which can lead to the death of tissue.

Dry gangrene typically develops in areas that are compromised and can result in the affected tissue turning black and becoming mummified. Unlike wet gangrene, it often does not involve the presence of bacteria and inflammation leading to pus formation. Rather, it is characterized by a more gradual process of tissue necrosis without the overt signs of infection, as seen in conditions where circulation is severely impaired.

In contrast, wet gangrene, gas gangrene, and necrotizing fasciitis often occur in the context of more acute infections, typically associated with trauma, diabetes complications, or the introduction of pathogenic bacteria, and they are less common in patients specifically suffering from the chronic, ischemic conditions associated with peripheral artery disease.