Which condition is more likely to cause muscle flap failure?

Which condition is more likely to cause muscle flap failure?

• A. Artery Compromise
• B. Venous Congestion
• C. Nerve Injury
• D. Infection

Answer: (B)

Venous drainage is the key factor that determines muscle flap viability. If outflow is blocked or impaired, blood pools in the flap (venous congestion), raising venous pressure and causing edema that compromises capillary perfusion. Even with good arterial inflow, this backup of blood reduces oxygen delivery to the tissue and quickly leads to ischemia and eventual flap failure. Arterial compromise would cause rapid ischemia and is less common as the initial problem when a flap fails. Nerve injury mainly affects function, not immediate viability, and infection can contribute to problems but is not the most likely immediate cause of flap failure. So venous congestion best explains why a muscle flap fails.

Venous drainage is the key factor that determines muscle flap viability. If outflow is blocked or impaired, blood pools in the flap (venous congestion), raising venous pressure and causing edema that compromises capillary perfusion. Even with good arterial inflow, this backup of blood reduces oxygen delivery to the tissue and quickly leads to ischemia and eventual flap failure. Arterial compromise would cause rapid ischemia and is less common as the initial problem when a flap fails. Nerve injury mainly affects function, not immediate viability, and infection can contribute to problems but is not the most likely immediate cause of flap failure. So venous congestion best explains why a muscle flap fails.