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Peripheral Vascular Bypass Surgery :

Peripheral Vascular Bypass Surgery India offers information on Peripheral Vascular Bypass Surgery in India, Peripheral Vascular Bypass Surgery cost India, Peripheral Vascular Bypass Surgery hospital in India, Delhi, Mumbai, Chennai, Hyderabad & Bangalore, Peripheral Vascular Bypass Surgeon in India

What is Peripheral Vascular Bypass Surgery?

Purpose of Peripheral Vascular Bypass Surgery

Peripheral Vascular Disease

Diagnosis

Preparation

How is Peripheral Artery Bypass Surgery done?

Aftercare

Risks

Normal Results

Morbidity and Mortality Rates

What is Peripheral Vascular Bypass Surgery?

A peripheral vascular bypass, also called a lower extremity bypass, is the surgical rerouting of blood flow around an obstructed artery that supplies blood to the legs and feet. This surgery is performed when the buildup of fatty deposits (plaque) in an artery has blocked the normal flow of blood that carries oxygen and nutrients to the lower extremities. Bypass surgery reroutes blood from above the obstructed portion of an artery to another vessel below the obstruction.

A bypass surgery is named for the artery that will be bypassed and the arteries that will receive the rerouted blood. The three common peripheral vascular bypass surgeries are:

Aortobifemoral bypass surgery, which reroutes blood from the abdominal aorta to the two femoral arteries in the groin.

Femoropopliteal bypass (fem-pop bypass) surgery, which reroutes blood from the femoral artery to the popliteal arteries above or below the knee.

Femorotibial bypass surgery, which reroutes blood between the femoral artery and the tibial artery.

A substitute vessel or graft must be used in bypass surgeries to reroute the blood. The graft may be a healthy segment of the patient's own saphenous vein (autogenous graft), a vein that runs the entire length of the thigh. A synthetic graft may be used if the patient's saphenous vein is not healthy or long enough, or if the vessel to be bypassed is a larger artery that cannot be replaced by a smaller vein.

Purpose of Peripheral Vascular Bypass Surgery

Peripheral vascular bypass surgery is performed to restore blood flow (revascularization) in the veins and arteries of people who have peripheral arterial disease (PAD), a form of peripheral vascular disease (PVD). People with PAD develop widespread hardening and narrowing of the arteries (atherosclerosis) from the gradual build-up of plaque. In advanced PAD, plaque accumulations (atheromas) obstruct arteries in the lower abdomen, groin, and legs, blocking the flow of blood, oxygen, and nutrients to the lower extremities (legs and feet). Rerouting blood flow around the blockage is one way to restore circulation. It relieves symptoms in the legs and feet, and helps avoid serious consequences such as heart attack, stroke, limb amputation, or death.

Demographics

Approximately 8–10 million people in the United States have PAD caused by atherosclerosis. These people are at high risk of arterial occlusion, and are candidates for peripheral vascular bypass surgery. Occlusive arterial disease is found in 15–20% of men and women older

India Surgery Peripheral Bypass Surgery, India Cost Peripheral Bypass, Peripheral Bypass Surgery

In this femoropopliteal bypass, a portion of the saphenous vein can be removed and used to bypass a portion of a diseased artery. To accomplish this, an incision is made down the inside of the leg (A). The saphenous vein is tied off from its tributaries and removed (B). An incision is made in the recipient artery (C), and the vein is stitched to it at the top and bottom of the leg (D). (Illustration by GGS Inc.)

than age 70. In people younger than age 70, it occurs more often in men than women, particularly in those who have ever smoked or who have diabetes. Women with PAD live longer than men with the same condition, accounting for the equal incidence in older Americans. African-Americans are at greater risk for arterial occlusion than other racial groups in the United States.

Peripheral Vascular Disease

The circulatory system delivers blood, oxygen, and vital nutrients to the limbs, organs, and tissues throughout the body. This is accomplished via arteries that deliver oxygen-rich blood from the heart to the tissues and veins that return oxygen-poor blood from organs and tissues back to the heart and lungs for re-oxygenation. In PAD, the gradual accumulation of plaque in the inner lining (endothelium) of the artery walls results in widespread atherosclerosis that can occlude the arteries and reduce or cut off the supply of blood, oxygen, and nutrients to organ systems or limbs.

Peripheral vascular bypass surgery is a treatment option when PAD affects the legs and feet. PAD is similar to coronary artery disease (CAD), which leads to heart attacks and carotid artery disease (CAD), which causes stroke. Atherosclerosis causes each of these diseases. Most often, atherosclerotic blockage or narrowing (stenosis) occurs in the femoral arteries that supply the thighs with blood or in the common iliac arteries, which are branches of the lower abdominal aorta that also supplies the legs. The popliteal arteries (a portion of the femoral arteries near the surface of the legs) or the posterior tibial and peroneal arteries below the knee (portions of the popliteal artery) can be affected.

Just as coronary artery disease can cause a heart attack when plaque blocks the arteries of the heart, or blockage in the carotid artery leading to the brain can cause a stroke, occlusion of the peripheral arteries can create life-threatening conditions. Plaque accumulation in the peripheral arteries blocks the flow of oxygen-carrying blood, causing cells and tissue in the legs and feet to die from lack of oxygen (ischemia) and nutrition. Normal growth and cell repair cannot take place, which can lead to gangrene in the limbs and subsequent amputation. If pieces of the plaque break off, they can travel from the legs to the heart or brain, causing heart attack, stroke, or death.

The development of atherosclerosis and PAD is influenced by heredity and also by lifestyle factors, such as dietary habits and levels of exercise. The risk factors for atherosclerosis include:

High levels of blood cholesterol and triglycerides.

High blood pressure (hypertension)

Cigarette smoking or exposure to tobacco smoke

Diabetes, types 1 and 2

Obesity

Inactivity, lack of exercise

Family history of early cardiovascular disease

Sometimes the body will attempt to change the flow of blood when a portion of an artery is narrowed by plaque. Smaller arteries around the blockage begin to take over some of the blood flow. This adaptation of the body (collateral circulation) is one reason for the absence of symptoms in some people who have PAD. Another reason is that plaque develops gradually as people age. Symptoms usually don't occur until a blockage is over 70%, or when a piece of plaque breaks off and blocks an artery completely. Blockage in the legs reduces or cuts off circulation, causing painful cramping during walking, which is relieved on rest (intermittent claudication). The feet may ache even when lying down at night.

Diagnosis

After obtaining a detailed history and reviewing symptoms, the physician examines the legs and feet, and orders appropriate tests or procedures to evaluate the vascular system. Diagnostic tests and procedures may include:

Blood pressure and pulses : pressure measurements are taken in the arms and legs. Pulses are measured in the arms, armpits, wrists, groin, ankles, and behind the knees to determine where blockages may exist, since no pulse is usually felt below a blockage.

Doppler ultrasonography : direct measurement of blood flow and rates of flow, sometimes performed in conjunction with stress testing (tests that incorporate an exercise component).

Angiography : an x ray procedure that provides clear images of the affected arteries before surgery is performed.

Blood tests : routine tests such as cholesterol and glucose, as well as tests to help identify other causes of narrowed arteries, such as inflammation, thoracic outlet syndrome, high homocycteine levels, or arteritis.

Spiral computed tomography (CT angiography) or magnetic resonance angiography (MRA) : less invasive forms of angiography.

Preparation

If not done earlier in the diagnostic process, ultrasonography or angiography procedures may be performed when the patient is admitted to the hospital. These tests help the physician evaluate the amount of plaque and exact location of the narrowing or obstruction. Any underlying medical condition, such as high blood pressure, heart disease, or diabetes is treated prior to bypass surgery to help obtain the best surgical result. Regular medications, such as blood pressure drugs or diuretics, may be discontinued in some patients. Routine pre-operative blood and urine tests are performed when the patient is admitted to the hospital.

How is Peripheral Artery Bypass Surgery done?

Surgery to bypass a blocked leg artery can relieve your symptoms. The bypass is done with a graft, a special tube that reroutes blood around a blockage. India Surgery Peripheral Bypass Surgery, Peripheral Bypass Surgery, Peripheral Bypass Surgery, India Surgery Tour

India Surgery Peripheral Bypass Surgery, Peripheral Bypass Surgery, Peripheral Bypass Surgery, India Surgery Tour

Types of Grafts

Blood vessel grafts often come from your own leg. They are removed and prepared at the time of the bypass. In some cases, a leg vein is left in place and connected to the artery (an in situ procedure).

Manmade (synthetic) grafts are materials easily accepted by the body. These grafts work best on arteries at or above the knee.

Bypass surgery is an open procedure that requires general anesthesia. In femoropopliteal bypass or femorotibial bypass, the surgeon makes an incision in the groin and thigh to expose the affected artery above the blockage, and another incision (behind the knee for the popliteal artery, for example) to expose the artery below the blockage. The arteries are blocked off with vascular clamps. If an autogenous graft is used, the surgeon passes a dissected (cut and removed) segment of the saphenous vein along the artery that is being bypassed. If the saphenous vein is not long enough or is not of good quality, a tubular graft of synthetic (prosthetic) material is used. The surgeon sutures the graft into an opening in the side of one artery and then into the side of the other. In a femoropopliteal bypass, for example, the graft extends from the femoral artery to the popliteal artery. The clamps are then removed and the flow of blood is observed to make sure it bypasses the blocked portion of the affected artery.

Aortobifemoral bypass surgery is conducted in much the same way, although it requires an abdominal incision to access the lower portion of the abdominal aorta and both femoral arteries in the groin. This is generally a longer and more difficult procedure. Synthetic grafts are used because the lower abdominal aorta is a large conduit, and its blood flow cannot be handled by the smaller saphenous vein. Vascular surgeons prefer the saphenous vein graft for femoropopliteal or femorotibial bypass surgery because it has proven to stay open and provide better performance for a longer period of time than synthetic grafts. Bypass surgery patients will be given heparin, a blood thinner, immediately after the surgery to prevent clotting in the new bypass graft.

Aftercare

After bypass surgery, the patient is moved to a recovery area where blood pressure, temperature, and heart rate are monitored for an hour or more. The surgical site is checked regularly. The patient is then transferred to a concentrated care unit to be observed for any signs of complications. The total hospital stay for femoropopliteal bypass or femorotibial bypass surgery may be two to four days. Recovery is slower with aortobifemoral bypass surgery, which involves abdominal incisions, and the hospital stay may extend up to a week. Walking will begin immediately for patients who have had femoropopliteal or femorotibial bypasses, but patients who have had aortobifemoral bypass may be kept in bed for 48 hours. When bypass patients go home, walking more each day, as tolerated, is encouraged to help maintain blood flow and muscle strength. Feet and legs can be elevated on a footstool or pillow when the patient rests. Some swelling of the leg should be expected; it does not indicate a problem and will resolve within a month or two.

During recuperation, the patient may be given pain medication if needed, and clot prevention (anticoagulant) medication. Any redness of the surgical site or other signs of infection will be treated with antibiotics. Patients are advised to reduce the risk factors for atherosclerosis in order to avoid repeat narrowing or blockage of the arteries. Repeat stenosis (restenosis) has been shown to occur frequently in people who do not make the necessary lifestyle modifications, such as changes in diet, exercise, and smoking cessation. The benefits of the bypass surgery may only be temporary if underlying disease, such as atherosclerosis, high blood pressure, or diabetes, is not also treated.

Risks

The risks associated with peripheral vascular bypass surgery are related to the progressive atherosclerosis that led to arterial occlusion, including a return of pre-operative symptoms. In patients with advanced PAD, heart attack or heart failure may occur. Build up of plaque has also taken place in the patient's arteries of the heart. Restenosis, the continuing build up of plaque, can occur within months to years after surgery if risk factors are not controlled. Other complications may include:

Clot formation in a saphenous vein graft

Failed grafts or blockages in grafts

Reactions to anesthesia

Breathing difficulties

Embolism (clot from the surgical site traveling to vessels in the heart, lungs, or brain)

Changes in blood pressure

Infection of the surgical wound

Nerve injury (including sexual function impairment after aortobifemoral bypass)

Post-operative bleeding

Failure to heal properly

Normal Results

A femoropopliteal or femorotibial bypass with an autogenous graft of good quality saphenous vein has been shown to have a 60–70% chance of staying open and functioning well for five to 10 years. Aortobifemoral bypass grafts have been shown to stay open and reduce symptoms in 80% of patients for up to 10 years. Pain and walking difficulties should be relieved after bypass surgery. Success rates improve when the underlying causes of atherosclerosis are monitored and managed effectively.

Morbidity and Mortality Rates

The risk of death or heart attack is about 3–5% in all patients undergoing peripheral vascular bypass surgery. Following bypass surgery, amputation is still an outcome in about 40% of all surgeries performed, usually due to progressive atherosclerosis or complications caused by the patient's underlying disease condition.

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