Cor pulmonale: causes, symptoms and treatment

The  human heart has four different chambers; the lower right chamber takes the name of right ventricle and is responsible for pumping the blood contained directly to the lungs, where the release of carbon dioxide and the withdrawal of oxygen will take place.

Cor pulmonale, or right ventricular failure, is a disease characterized by the enlargement of the right ventricle of the heart, which occurs when the heart is forced to work excessively hard to counter lung lesions which are the most common cause of resistance to the action of pump.

If in the first instance the increase in size compensates for the necessary increase in force required, over time the effort tends to weaken the walls of the ventricle, which therefore loses the ability to exert adequate pressure on the blood.

Pivotal symptoms include difficulty breathing , chest pain , easy fatigue, and a bluish skin tone .

The diagnosis is clinical (ie formulated during the medical examination) and confirmed by instrumental tests ( echocardiogram and right cardiac catheterization ).

Unfortunately, the prognosis is highly negative and life expectancy depends on the timeliness of diagnosis and the severity of the disease itself. The treatments involve stabilizing the patient with drug therapy (anticoagulants and antihypertensive drugs), oxygen therapy , or even heart or heart and lung transplantation in the most severe cases.

Causes

The work normally done by the right ventricle consists in pumping the oxygen-free blood from the body through the pulmonary artery to reach the lungs, where it will be oxygenated and then transported, through the pulmonary veins, to the left atrium, right atrium, and then again spread to the whole body.

Cor pulmonale is heart failure of the right ventricle, which is the progressive loss of its ability to effectively pump blood to the lungs.

It is usually a consequence of the increase in pulmonary arterial pressure (pulmonary hypertension ), a condition characterized by changes in the small blood vessels within the lungs which become responsible for an increase in resistance to the incoming blood.

This makes it more difficult for the heart to pump blood into the lungs, so what is observed is a reaction aimed at compensating for resistance through an increase in the necessary force, which causes  the ventricle to enlarge and, over time, its weakening. (like a worker exhausted by the overtime to which he is compulsorily subjected).

  • Pulmonary hypertension, a condition underlying the origin of cor pulmonale, can be caused by:
  • Pulmonary disorders, eg  pulmonary embolism , emphysema , copd
  • Neuromuscular disorders, eg als , poliomyelitis , myasthenia gravis
  • Circulatory disorders, e.g. pulmonary thromboembolism , sickle cell anemia , hereditary idiopathic pulmonary hypertension
  • Deformity of the rib cage, with generalized alveolar hypoventilation
  • Alterations in ventilation control, both centrally and peripherally

Depending on the presentation of the symptoms and the causes that originate the pulmonary heart is divided into acute and chronic.

Acute pulmonary heart

It is caused by a sudden increase in the necessary force, which leads to a dilation of the right ventricular chamber, physiologically poor in muscle component compared to the left chamber as it is normally subjected to much lower pressures. It is the least common form of cor pulmonale and is usually caused by a thromboembolic event (for example, pulmonary embolism). Once the cause is corrected, remission is possible.

Chronic pulmonary heart

It is caused by a progressive increase in pulmonary pressure. So that the heart has time to compensate by developing (hypertrophying) the muscle walls of the right ventricle. This form represents the most common heart disease in the elderly and is usually secondary to chronic lung disease (COPD in primis). Since irreversible cardiac structural changes have occurred, in this case it is not possible to remission of the pathology.

Symptoms

The chronic pulmonary heart initially occurs in itself completely asymptomatic, although the symptoms characterizing the responsible lung disease are present. Over time, the signs and symptoms of right ventricular failure will become evident, including:

  • Swelling of the legs and ankles (edema of the lower limbs and water retention )
  • Accumulation of fluid in the abdomen ( ascites )
  • Increase in the size of the liver ( hepatomegaly )
  • Air hunger (dyspnoea)
  • Bluish discoloration of the fingers and lips (cyanosis)
  • Drumstick fingers (digital hippocratism)
  • Fatigability
  • Chest pain
  • Increased heart rate ( tachycardia )
  • Sudden and temporary loss of consciousness ( syncope )

Diagnosis

The referral specialist is the cardiologist, who will visit the patient

  • Collecting the anamnesis, or investigating the clinical history and risk factors
  • And carrying out an accurate physical examination, evaluating the presence of gondiore in the lower limbs. The turgor of the neck veins and auscultating the heart (presence of accentuation of the pulmonary component of the second heart sound s2 and of murmurs from tricuspid or pulmonary insufficiency).

To confirm the diagnosis, further laboratory and instrumental tests may be required such as:

  • Blood tests with bnp , an important marker of heart damage
  • Chest x -ray: there is a dilation of the right ventricle and of the proximal part of the pulmonary artery
  • Electrocardiography : characteristic signs are right axial deviation, qr wave in v1 and dominant r wave in leads v1-v3
  • Echocardiography: first level examination that allows to evaluate the structural alterations of the heart
  • Mri of the heart: second level examination much more sensitive than echocardiography which highlights in great detail the structural alterations of the heart
  • Right heart catheterization (gold standard for the diagnosis and quantification of pulmonary hypertension)

Treatment

Treatment of cor pulmonale includes supportive measures and approaches to correct the underlying cause of the development of pulmonary hypertension.

It is a complex condition, which requires prompt identification and correction of the cause of pulmonary hypertension; in case of delay and development of irreversible structural changes of the heart it would no longer respond to treatment.

Among the measures to support vital functions, the following can be used:

  • Oxygen therapy: to improve or reduce hypoxia  (lack of oxygen in the body)
  • Pharmacological treatment, which may include diuretics (to be used in the treatment of edema with great care as even slight reductions in preload severely worsen the cor pulmonale), cortisone , anticoagulants and vasodilators
  • Cardiac or cardiopulmonary transplant if necessary: ​​it represents the only truly decisive intervention, however with all the future risks and complications related to the transplant itself (for example the risk of rejection, immunosuppression , …).

In any case, it is essential to adopt a healthy lifestyle, both in terms of prevention and treatment, which includes:

  • Not smoking
  • Consume alcohol in moderation and abolish spirits
  • Follow a low-salt (low salt) diet
  • Drink at least two liters of fluids a day
  • Achieve and maintain a healthy weight
  • Take regular physical activity
  • Avoid stressful situations

In women diagnosed with cor pulmonale, it is also highly not recommended to become pregnant. As it is a destabilizing event for the organism that could expose the risk of a fatal outcome for both the mother and the fetus.

Leave a Reply

Your email address will not be published.