Gangrene

Gangrene is a serious condition where body tissue dies because it doesn’t get enough blood flow, which means it also loses oxygen and nutrients. This can happen if blood vessels are blocked by an infection, an injury, or conditions like diabetes or atherosclerosis (hardening of the arteries). Gangrene most commonly affects the toes, fingers, hands, and feet, but it can happen in other parts of the body too. It is more likely to occur in people with poor circulation, such as those with diabetes, smokers, people with severe injuries, or those with a weakened immune system. If not treated quickly, gangrene can spread and become life-threatening, so it’s important to get medical help as soon as possible.

Diagnosing Gangrene

Gangrene is diagnosed by a doctor through a combination of a physical exam, medical history, and tests. The doctor will look at the affected area to check for signs like skin discoloration (often black, blue, or green), a bad smell, or swollen tissue. They might also press on the skin to see if there’s pain or if it feels cool to the touch. To confirm the diagnosis, doctors may order imaging tests like X-rays, CT scans, or MRIs to see how much tissue is damaged. They might also take blood tests to look for signs of infection or a tissue sample (biopsy) to check for dead cells. Early diagnosis is important so treatment can start quickly to prevent the gangrene from spreading.

Imaging Studies

To diagnose gangrene, doctors may use imaging studies like X-rays, CT scans, or MRIs to get a better look at the affected area. An X-ray can show if there are gas bubbles under the skin, which can be a sign of certain types of gangrene called “gas gangrene”. A CT scan gives a more detailed view by taking multiple X-ray images from different angles, which helps doctors see how far the damage has spread in the tissues. An MRI is even more detailed and can show changes in the soft tissues and blood vessels, helping to detect areas with poor blood flow or tissue death. These imaging tests help doctors understand how severe the gangrene is and plan the best treatment.

Treating Gangrene

Gangrene is treated by removing the dead tissue and stopping the spread of the infection to save as much healthy tissue as possible. This can include surgery to cut away the dead tissue, which is called debridement, or even amputating a finger, toe, or limb if the gangrene is severe. Doctors might also use antibiotics to fight any infection, often given through an IV (a tube in your vein). In some cases, they use hyperbaric oxygen therapy, where a person breathes pure oxygen in a special chamber to help increase oxygen in the blood and improve the healing of the affected area. If poor blood flow caused the gangrene, doctors might do surgery to fix blood vessels and improve circulation. Early treatment is important to prevent gangrene from getting worse.

Edited by Stephen Pinney MD November 11th, 2024