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Peculiarities of treatment of tetralogy of Fallot in children and adults

Peculiarities of treatment of tetralogy of Fallot in children and adults

| from Booking Health GmbH | Diagnosis & treatment

Tetralogy of Fallot (ToF) is the type of congenital heart disease that is diagnosed in up to 3 of 10,000 newborns. The pathology may be detected even before the birth, by means of expert fetal echocardiography. Abnormal structure of the heart and major vessels hampers child’s physical activity and normal physical growth and... 

Tetralogy of Fallot (ToF) is the type of congenital heart disease that is diagnosed in up to 3 of 10,000 newborns. The pathology may be detected even before the birth, by means of expert fetal echocardiography. Abnormal structure of the heart and major vessels hampers child’s physical activity and normal physical growth and development. Specialized European clinics offer the reconstructive cardiac surgeries for children and adults, as well as maintenance pharmacotherapy and rehabilitation. Timely operation performed by an experienced cardiac surgeon guarantees excellent survival and good long-term results.

What happens in people with tetralogy of Fallot (why do we need to treat it)

ToF stays in the focus of clinical attention, as it is the most widespread form of the congenital heart disease with incidence of 0.34 per 1000 newborns (worldwide data). In children with the tetralogy of Fallot there are several malformations of heart and neighboring great vessels:

  1. Stenosis of the pulmonary artery that carries oxygen-poor blood from the right ventricle of the heart to lungs
  2. Hypertrophy of the right ventricle that has to force blood through the narrowed pulmonary artery
  3. Ventricular septal defect, so that oxygen-poor blood can move freely from the right ventricle of the heart to the left one (normally, the left ventricle contains only oxygen-rich blood)
  4. Dextroposition of the aorta or overriding aorta, so that it starts from the middle of heart ventricles (normally, aorta comes off the left ventricle of the heart and carries oxygen-rich blood from the heart to all tissues and organs)

Such structure of the heart, aorta and pulmonary artery leads to poor oxygenation of organs and development of disturbing symptoms, like:

  • Bluish skin color during the attack
  • Loss of consciousness during the attack
  • Shortness of breath during physical exertion or feeding
  • Rapid fatigability during play or other physical exertion
  • Poor weight gaining
  • Developmental delays, including the physical, emotional or mental ones
  • Clubbed fingers

Infants often experience "blue" or "tet" spells that are paroxysmal hypercyanotic attacks. Unlike toddlers and older children, they cannot alleviate symptoms by the squatting. An infant becomes cyanotic, gasps for air and does not respond to parent’s voices. This is a life-threatening condition.

As for the less severe symptoms, they not only influence quality of life but also affect child’s further psycho-emotional development and physical growth. Thus, timely reestablishing physiological blood flow is essential.

 

Treatment of tetralogy of Fallot in children
(c) depositphotos

 

Treatment measures in children

Treatment of tetralogy of Fallot in children includes three groups of methods:

  1. Pharmacotherapy in newborns with severe symptoms. In newborns with the severe cyanosis doctors administer infusions of prostaglandin E1. Administered in the dose of 0.05-0.1 mcg / kg / min intravenously, prostaglandin E1 stimulates ductus arteriosus opening and thereby increases the pulmonary blood flow.
  2. Symptomatic physical measures in older children. A parent or a healthcare professional presses child’s knees to his chest (or a child squats spontaneously), calms him down and provides free access to oxygen (from the air or oxygen mask).
  3. Surgical treatment is the only curative measure that eliminates the root cause of the disease. It may be performed as the single-stage procedure or include several consecutive interventions.

The single-stage intracardiac repair is typically performed between 3 and 6 months of age. It consists of repairing the septal defect between the left and right ventricles along with restoring normal blood flow through the pulmonary artery. In case a child has pulmonary atresia the intervention also includes connecting the right ventricle to the lung artery.

In certain clinical situations it is more preferable to apply a staged approach. This allows improving a child’s general condition before the intracardiac repair. The initial surgery is Blalock-Taussig shunt (BT shunt). BT shunt procedure implies creating the connection between the thoracic artery and the lung artery. This increases flow of oxygen-poor blood to the lungs and, thus, improves blood oxygenation.

Treatment measures in adults

As for the older patients that have not undergone surgery while being a child, they still have options of pharmacotherapy for symptoms alleviation and surgical correction of the defect.

Pharmacotherapy is a symptomatic treatment. It is aimed at:

  • Reducing hypertrophy of the right ventricle
  • Improving blood circulation in the lungs
  • Controlling circulating fluid volume and edema prevention

In adults, more pharmacological agents can be applied, including the following ones.

Vasodilators. Vasodilators allow blood flow more freely from the heart to the systemic vessels. This facilitates work of the heart ventricles and improves cardiac output. The most commonly used vasodilator is prostaglandin E1 (alprostadil).

Diuretics. Diuretics decrease circulating blood volume and concomitant risks of edema development by diuresis stimulation. Loop diuretics, namely furosemide, are also used for the symptomatic treatment of congestive heart failure.

Alpha-1 -agonists. Alpha-1 -agonists increase heart rate and the myocardial contractility. Resulting in better cardiac output and higher systemic blood pressure, alpha-1 -agonists improve oxygen delivery to organs and tissues. One of the most efficient drugs from this pharmacological group is phenylephrine.

Analgesics. Analgesics are used during the hypercyanotic episodes for pain control and psycho-emotional management. Severe episodes require intravenous administration of morphine sulfate. Predictable effects and good safety profile of the medication make it drug of choice.

Talking about the curative or partial surgeries, adults can undergo the same operations as the children. The main difference is adults have a smaller reserve of cardiac stem cells. Thus, the regeneration of myocardium, endocardium and major vessels in adults is worse than in children. Postoperative recovery may be longer and result in comparatively worse functional outcomes.

Benefits of cardiac surgery in German hospitals

For the objective appraisal of the success rates in the field of cardiac surgery, the German Society for Thoracic and Cardiovascular Surgery has founded the respective registry. It includes data on all heart surgeries performed in 78 German specialized centers and heart surgery departments. The summarized data for 2018 demonstrates 97.1% survival rate, which is quite impressive. Cardiosurgery in Germany is based on the following principles:

  1. High-quality preoperative medical examination that allows revealing concomitant medical conditions. This is essential in children with genetic disorders when tetralogy of Fallot may be accompanied by DiGeorge syndrome or pulmonary pathology.
  2. Safe anaesthetic. In children general anaesthetic must ensure proper sedation and analgesia along with absence of withdrawal symptoms or hemodynamic changes. The optimal medicine for the perioperative period is dexmedetomidine, other options include intravenous acetaminophen and propofol.
  3. Preference to endovascular and minimally invasive interventions. Beyond all doubt, complex heart reconstruction requires open surgical approach and wide surgical field. Often, two or three surgeons are involved in one procedure. Nevertheless, initial surgeries (like Blalock-Taussig shunt) may be performed through a minimally invasive approach.
  4. Using reliable vascular prostheses, if any are required. In most cases, patient’s own tissues are sufficient for the heart reshaping. Otherwise a surgeon uses certified synthetic prostheses.
  5. Considering the aesthetic aspect. Regardless of a patient’s age, German surgeons take care about avoiding large hypertrophic scars on the chest.
  6. Thorough post-operative monitoring. Patients spend up to 24 hours of the early postoperative period in the intensive care unit. This ensures constant monitoring vital signs and timely response to their significant changes.
  7. Detailed recommendations regarding the follow-up examinations and rehabilitation. The surgical medical treatment in Germany is always followed by the postoperative rehabilitation and the continuous maintenance pharmacotherapy. Provided by trained healthcare professionals, cardiological rehabilitation facilitates the postoperative functional recovery and proper further development of the cardiovascular system. Regular medical check-ups include laboratory (blood test, coagulogram, etc.) and instrumental (ECG, EchoCG, etc.) tests and provide doctor with objective information about state of the heart.

The updated annual registry of the German Society for Thoracic and Cardiovascular Surgery represents current success rates and serves as the independent basis for quality management, i.e. all healthcare facilities strive for reaching better indicators.

Complex cardiac surgery abroad with Booking Health

Choosing the healthcare facility and expert in cardiac surgery may be a complicated task for a person without relevant experience or clinical medical knowledge. Treatment of toddlers requires special attention, as only a limited number of hospitals has equipment for complex pediatric interventions. Most of these hospitals are located in Germany.

Experts of the certified medical tourism provider Booking Health offer all-inclusive assistance with choosing the healthcare facility and doctor, preparing for the trip, undergoing surgery and arranging follow-up procedures. The list of Booking Health services includes but not limited to:

  • Choosing proper hospital based on the annual qualification profile (cardiology, cardiac surgery, children's health)
  • Establishing the preliminary communication with your cardiologist and surgeon
  • Booking the appointment or room in the cardiologic department
  • Preparing the preliminary treatment program (without repeating previous diagnostic tests) and explaining its stages
  • Providing favorable cost for treatment and relevant services, excluding additional fees (saving up to 50%)
  • Independent external monitoring of all medical interventions
  • Insurance against the cost of program increase in case of complications (200,000 EUR, valid for 4 years)
  • Help in purchasing and forwarding medicines, if necessary
  • Communication with the hospital and doctor after treatment completion
  • Control of bills and return of unspent funds
  • Organization of rehabilitation, follow-up tests, maintenance therapy
  • Offering travel service of the highest level: booking plane tickets and hotels, transfer organization, services of interpreter

To start planning your treatment or treatment of your child, please, leave the request on the Booking Health website. A patient case manager or medical advisor will contact you ASAP, so you will discuss all the details. The main aim of Booking Health is to help you with improving and maintaining your well-being.

 

Treatment of tetralogy of Fallot in Germany
(c) depositphotos

 

Choose treatment abroad and you will for sure get the best results!

 


Author: Dr. Nadezhda Ivanisova

 

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