I77.0 Arteriovenous fistula, acquired

Name of the Condition

• Arteriovenous Fistula, Acquired
• Technical term: Acquired Arteriovenous Fistula

Summary

An arteriovenous fistula (AVF) is an abnormal connection between an artery and a vein, which can occur due to trauma, surgery, or vascular disease. Unlike congenital AVFs, acquired AVFs develop later in life.

Causes

• Penetrating injuries
• Surgical procedures, particularly ones involving blood vessels
• Vascular diseases, such as atherosclerosis and thrombosis
• Infections that affect vascular tissues

Risk Factors

• Recent surgeries involving vasculature
• History of trauma or physical injury
• Conditions requiring catheterization or dialysis access

Symptoms

• Swollen area near the site of the fistula
• Pulsatile mass and a palpable thrill or vibration over the site
• Bruit (abnormal sound) heard over the affected area
• Reduced blood flow to tissues beyond the fistula, leading to pain or fatigue

Diagnosis

• Physical examination revealing characteristic signs such as bruit or thrill
• Ultrasound to visualize blood flow
• MRI or CT angiography for detailed imaging
• Doppler study to assess the blood flow dynamics

Treatment Options

• Surgical correction to disconnect the artery and vein
• Endovascular procedures, such as stenting and coiling
• In some cases, monitoring when asymptomatic and not causing complications

Prognosis and Follow-Up

• The outcome depends on the size, location, and cause of the AVF.
• Surgical treatment generally has a good prognosis when addressed timely.
• Regular monitoring is essential to detect any recurrence or complications early.

Complications

• Heart failure due to increased cardiac workload
• Aneurysm formation and hemorrhage
• Limb ischemia if blood diversion reduces arterial supply to extremities

Lifestyle & Prevention

• Protective measures to prevent trauma, especially in high-risk occupations
• Careful management of conditions requiring frequent intravenous access
• Healthy lifestyle to minimize vascular complications

When to Seek Professional Help

• Sudden swelling, warmth, or a pulsatile mass near a recent surgical site or injury
• Symptoms of heart failure like shortness of breath or fatigue
• Changes in limb color or temperature indicative of reduced blood flow

Additional Resources

• American Heart Association: heart.org
• Vascular Disease Foundation: vascularcures.org

Tips for Medical Coders

• Ensure distinction between congenital and acquired forms of AVF.
• Verify the precise location of the fistula for accurate coding if specified.
• Avoid common errors like misclassifying AVFs as similar vascular anomalies.