A vascular infection is a bacterial, fungal or viral infection that develops in an artery, a vein or a graft intended to replace one of these blood vessels. Because blood vessels are responsible for carrying oxygen and nutrients throughout the body, an infection in these areas can disrupt normal circulation and lead to serious complications if not treated promptly.
How Can a Vascular Infection Affect Heart Function?
Understanding vascular infections is important because the vascular system and the heart work together to maintain healthy blood flow. When an infection develops in a blood vessel, it can cause inflammation, blockage or weakening of the vessel walls. These issues can make it harder for the heart to pump blood efficiently.
In some cases, a vascular infection can spread through the bloodstream and place additional strain on the heart. This may increase the risk of complications such as reduced oxygen delivery, tissue damage or even infection of the heart itself.
The Importance of the Timely Diagnosis of Vascular Infections
Early diagnosis is critical for treating vascular infection. Because these infections develop within the blood vessels, they can spread quickly through the bloodstream and affect multiple areas of the body. Identifying the condition in its initial stages allows for prompt treatment, which can help control the infection before it causes more acute damage.
Delays in diagnosis may allow the infection to worsen, increasing the risk of complications that are more difficult to treat. Advanced imaging, laboratory testing and expert evaluation can be used to confirm a vascular infection and help determine the most effective treatment approach.
Potential Complications of Untreated Vascular Infections
If a vascular infection is left untreated, it can lead to serious and potentially life-threatening complications, including:
• Blood vessel damage – Infection can weaken vessel walls, increasing the risk of rupture or aneurysm formation.
• Blood clots – Inflammation may lead to clot formation, which can restrict or block blood flow.
• Sepsis – The infection can spread into the bloodstream, causing a severe systemic response.
• Organ damage – Reduced blood flow can damage vital organs, including the heart, brain and kidneys.
• Graft failure – Infections involving vascular grafts can lead to device failure and require additional surgery.
Timely diagnosis and treatment can help prevent these complications and protect overall cardiovascular health.
What Are the Types of Vascular Infections?
Vascular infections can occur because of a bacterial, viral or fungal invasion of blood vessels or prosthetic vascular materials. Some of the primary types of vascular infections include:
• Vascular graft infections – These can occur following the surgical placement of an artificial graft.
• Infected (mycotic) aneurysms – These infections can weaken an artery wall and cause it to balloon, which can potentially lead to a rupture.
• Septic thrombophlebitis – This is the inflammation of a vein associated with a blood clot and infection.
• Native blood vessel infection – This is the direct infection of a blood vessel, which can lead to narrowing (stenosis) or damage to the vessel wall.
• Endovascular device infection – These infections are related to catheters or other devices placed within a vessel.
What Are the Causes and Risk Factors of Vascular Infections?
Vascular infections most commonly develop due to contamination during or after vascular surgery, particularly when the procedure involves the bypass, repair or replacement of a blood vessel. For example, Staphylococcus bacteria located on a patient’s skin could transfer to the graft being inserted and lead to a staph infection. Because vascular infections can appear months or even years after surgery, it’s important to remain vigilant and seek treatment as needed.
Vascular infections can also develop when an infection from another part of the body enters the bloodstream. Some examples of these infections include:
• Heart valve infections (endocarditis)
• Urinary tract infections (UTIs)
• Infection spreading from an abscess or lymph node
• Severe food poisoning
Risk Factors for Vascular Infections
Certain conditions and lifestyle factors can increase the likelihood of developing a vascular infection. Understanding these risk factors can help support early detection and prevention.
Common risk factors include:
• Previous vascular surgery – Patients who have undergone vascular procedures, including the placement of a graft or stent-graft, face a higher risk due to the presence of foreign material in the body.
• Underlying health conditions – Conditions such as diabetes, high cholesterol and atherosclerosis can damage blood vessels and make them more vulnerable to infection.
• Compromised immune system – Individuals with weakened immune systems, including those with HIV or cancer, may have a reduced ability to fight off infections.
• Lifestyle habits – Smoking can damage blood vessels, reduce circulation and impair the body’s natural healing processes, increasing infection risk.
• Injury to blood vessels – Trauma or physical injury to blood vessels can create an entry point for infectious organisms.
• Chronic infections – Long-term infections such as HIV or hepatitis B or C may weaken the body’s defenses and increase susceptibility to vascular infections.
• Viral infections – Illnesses such as COVID-19 or influenza can contribute to systemic inflammation and may increase the risk of vascular complications.
Some individuals might also have a genetic predisposition that affects immune response or vascular integrity, potentially increasing susceptibility to infection.
What Are the Symptoms and Warning Signs of Vascular Infections?
A vascular infection may not develop immediately after an illness or procedure and, in some cases, can occur months or even years after surgery. The symptoms of a vascular infection can vary widely depending on the severity of the condition and the area affected. In some early or mild cases, symptoms may be subtle or even go unnoticed. However, as the infection progresses, symptoms often become more pronounced and may lead to serious complications.
Because some patients may remain asymptomatic in the initial stages, especially those with underlying conditions, regular monitoring and medical evaluation are important when risk factors are present.
Common symptoms and warning signs of a vascular infection may include:
• Systemic infection symptoms – Patients may experience persistent or recurrent fever, severe chills or rigors, intense sweating and unexplained weight loss, especially as the infection becomes more advanced.
• Localized pain – Pain may develop in specific areas such as the abdomen, back or limbs, often near the site of a previous vascular graft or stent, and can range from mild discomfort to severe, persistent pain.
• Incision site issues – After vascular surgery, signs such as discharge, redness, warmth or a wound that fails to heal properly may indicate a developing infection at the surgical site.
• Vascular-specific complications – More serious cases may present with a pulsating mass or noticeable discoloration in the toes or feet, which can signal reduced blood flow or severely infected vessels.
Recognizing these symptoms early, even when they appear mild, can reduce the risk of complications.
When Should You Seek Medical Advice?
You should seek immediate medical attention if you’re experiencing:
• High fever combined with severe pain in an area of a past vascular procedure.
• A newly discovered pulsating, painful lump.
• Rapidly developing coldness, numbness, or black/blue discoloration of a limb.
If you suspect a vascular infection, prompt diagnosis via blood tests and imaging is crucial, as treatment often involves intensive antibiotic therapy and surgery to remove infected vessels or grafts.
Diagnosis & Tests for Vascular Infections
To diagnose a vascular infection, physicians usually start with a blood test to identify inflammatory markers, like an elevated white blood cell count. If a blood test confirms the presence of an infection, the physician may order one or more of the following imaging tests to more precisely identify where the infection is located:
• Angiogram – A catheter is inserted into the vessels to guide dye injection so an X-ray can be performed on the arteries or veins.
• Computed tomography (CT) scan – CT scans detect vascular infections by using intravenous contrast dye to highlight blood vessels so doctors can identify signs of infection.
• Magnetic resonance imaging (MRI) scan – Detailed images of blood vessels are created.
• Pulse volume recording (PVR) study – This noninvasive test uses blood pressure cuffs to measure blood flow, calculate arterial pressure, and record volume changes in limbs.
• Positron emission tomography (PET) scan – Used to spot areas of infection or inflammation.
• Ultrasound – Noninvasive ultrasound imaging can evaluate blood flow and detect narrowing of blood vessels.
Other methods used for detecting vascular infections can include a white blood cell scan or a tissue biopsy to help identify inflammation, infection or vessel damage.
When diagnosing a vascular infection, several inflammatory, cardiovascular and structural conditions can present similar symptoms and need to be ruled out.
These include:
• Deep vein thrombosis (DVT)
• Atherosclerosis and Peripheral Artery Disease (PAD)
• Aortic dissection
• Arterial embolism
How Do You Treat Vascular Infections?
Treatment for vascular infections will vary from one patient to another based on several factors, including the type, severity and location of the infection, and the specialists at Tampa General Hospital's Heart & Vascular Institute will consider all of these variables when developing an individualized treatment plan.
In many cases, physicians are often able to treat vascular infections using antibiotics that target the organisms causing infection in blood vessels or grafts. Broad-spectrum antibiotics are often used initially, followed by culture-specific therapy. Antibiotics can be used to reduce infection risks before surgery, treat active infections, or provide long-term suppression.
Certain lifestyle changes can help prevent vascular diseases and related infections by improving circulation and reducing inflammation. Key actions can include quitting smoking, eating a heart-healthy diet, exercising regularly, and managing blood pressure.
In some instances, however, surgery may be necessary for a vascular infection. The specific procedure recommended will depend on the severity of the infection, the affected area and the patient’s overall health.
Common surgical procedures used to treat vascular infections include:
• Graft removal and replacement
• Artery reconstruction
• Vein bypass surgery
• Debridement
• Endovascular repair
When Surgery Is Recommended
Surgical treatment is typically recommended when the infection does not respond to medication alone, when a graft is involved or when there is a risk of serious complications such as vessel rupture, abscess formation or loss of blood flow. Patients with severe symptoms or evidence of spreading infection often require more urgent intervention.
Success Rates and Outcomes
Surgical outcomes for vascular infections depend on early diagnosis, the extent of the infection and the patient’s overall condition. When treated promptly and appropriately, many patients experience good outcomes with restored blood flow and infection control.
Ongoing Care After Vascular Infection Treatment
Continued care and monitoring are essential after treatment for a vascular infection, whether managed surgically or with medication. Even after the initial infection is controlled, there is a risk of recurrence or complications that can impact blood vessels and overall heart health.
Follow-up appointments allow specialists to monitor healing, evaluate blood flow and ensure that any grafts or repaired vessels are functioning properly. Imaging studies and lab testing may be used to detect early signs of reinfection or other concerns before they become more serious.
Long-term management may also include medication, lifestyle adjustments and control of underlying conditions such as diabetes or high cholesterol.
What Are the Complications and Long-Term Effects of Vascular Infections?
Yes, there can be significant complications and long-term effects if a vascular infection goes untreated for any length of time or if treatment is delayed.
These can include:
• Rupture and hemorrhage - Infected vessels or grafts can weaken, decay and burst, causing massive bleeding.
• Pseudoaneurysms - The formation of a "false" aneurysm at an infected site, which is prone to rupture.
• Amputation - Severe infections, especially in the limbs, may necessitate amputation to stop the spread of infection.
• Sepsis - Because the infection is within the bloodstream, it can cause system-wide infection (sepsis).
• Embolization - Infected blood clots (septic emboli) can break off and travel to other parts of the body, such as the lungs (causing pulmonary embolism) or brain (causing stroke).
• Fistula formation - Infections can create abnormal connections (fistulae) between a vessel and surrounding structures, such as the intestine.
Long-Term Effects
Long-term outcomes can vary depending on the severity of the infection, the patient’s overall health and how quickly treatment is started. Long-term effects include:
• Elevated risk of mortality
• Chronic recurrence
• Persistent vascular dysfunction
• Reduced quality of life
How Do You Prevent and Reduce Your Risk of Vascular Infections?
Preventing and reducing the risk of vascular infections and diseases involves adopting a heart-healthy lifestyle. Steps can include quitting smoking, engaging in at least 150 minutes of moderate weekly exercise, managing blood pressure and cholesterol, controlling diabetes and eating a diet rich in fruits, vegetables and fiber while limiting saturated fats.
Certain vaccines may also help reduce the risk of infection-related cardiovascular complications. These can include the annual influenza, COVID-19, pneumococcal, RSV and shingles vaccines, as they reduce infection-induced inflammation. Annual flu shots are particularly effective in reducing cardiovascular mortality.
In certain high-risk patients, physicians may recommend preventive antibiotics before specific dental procedures to reduce the risk of infection.
The TGH Difference for Vascular Infections
Vascular infections occur when bacteria, fungi or viruses affect blood vessels or grafts, disrupting circulation and increasing strain on the heart. Symptoms can range from mild or absent to severe pain, fever and other serious complications. Early diagnosis is essential to guide treatment, which may include antibiotics and surgery. Patients should consult a healthcare provider for personalized evaluation and treatment guidance.
The Heart & Vascular Institute at Tampa General Hospital offers advanced surgical and minimally invasive treatment options for vascular infections. Our team focuses on restoring circulation, eliminating infection and helping patients return to better cardiovascular health.