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Know about Thoracic Aortic Dissection
 Dr. Ritwick Raj Bhuyan

Know about Thoracic Aortic Dissection

Causes of thoracic aortic dissection

Thoracic aortic dissection usually occurs due to structural problems in the wall of this vessel. Didactically we can separate them into two groups:

  • The first is the one in which the patient, severely hypertensive and a long-term smoker, on average 60 years of age, will present chronic damage to the inner layer of the aorta, until one day it may rupture. There are times when the patient already has a dilated aorta that precedes the dissection.
  • The second is a group of younger patients, 30 to 40 years old, who suffer from genetic diseases such as Marfan, Ehlers-Danlos, and Turner Syndrome among others, or have a structural change in the heart called the bicuspid aortic valve. Some of these genetic syndromes involve collagen problems, and patients have structural changes in the middle layer of the aorta, which may one day be dissected.

Other less frequent situations, but that can also be triggers for aortic dissection, are pregnancy, trauma, and the use of illicit drugs, especially cocaine.

Symptoms of thoracic aortic dissection

The most common symptom in the acute phase is severe chest pain. Some patients report having the distinctive sensation of something breaking or tearing within them.

The main differential diagnosis is acute myocardial infarction. Other mild chest pains, such as muscle pain or dyspeptic seizures (gastritis), can also be considered.

Pain in the neck, back, or abdomen may also be reported.

Treatment for thoracic aortic dissection

Initial treatment consists of stabilizing the patient's blood pressure, sometimes with intravenous therapy and rapid reconstructive surgery if a risk of cardiac tamponade or organ system ischemia is identified.

When the initial portion of the ascending aorta is affected, close to the outlet of the heart, it is usually necessary to perform open surgery, opening the sternum, and change the diseased portion of the aorta for a Dacron prosthesis.

Most ischemic organ correction techniques and interventions in other portions of the Aorta now receive full endovascular therapy, with less patient morbidity and faster recovery.

Types of Surgery for Aortic Dissection :

Bentalls operation :

In this surgery the diseased aorta and the valve will be replaced with a new aorta (made of special cloth called Dacron) and a valve made together into a tube called “valve conduit”. This operation gives very satisfactory long term outcome. Sometimes , the operation also removes part of the arteries that supply the brain and in rare cases , this is combined with placement of a stent to cover the rupture of aorta lying in the chest or the abdomen. In these cases , surgeon uses some hybrid graft called “Thoraflex”.

Illustrated Bentall Operation – A. Large swelling in aorta called Aneurysm
B. Diseased part of the aorta removed with the valve
C. Aorta replaced with a cloth tube called the Dacron tube and attached to the valve
D. Completed operation with attached coronary arteries

Thora flex Hybrid graft:

  1. Graft with Dacron cloth with channels to replace the neck arteries and stent connected
  2. BGraft with stent placed in the thoracic aorta

For more information on this disease and treatment options, consult Dr. Ritwick Raj Bhuyan.

Director: Department of Cardiothoracic Vascular Surgery

Fortis Escorts Heart Institute, Okhla
New Delhi, India

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