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Various Cardiac Signs in Respiratory Diseases

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Chronic respiratory diseases are responsible for changes in the pulmonary circulation. This is associated with right ventricular cardiac disorders.

Written byDr. Partha Sarathi Adhya

Medically reviewed byDr. Kaushal Bhavsar

Published At September 5, 2023
Reviewed AtFebruary 8, 2024

The heart and lungs are the two most important organs of the human body. The heart acts as a pump and circulates blood in the body. Lungs receive deoxygenated blood from the heart and supply oxygenated blood to the heart. These two organs act in close collaboration and maintain circulatory equilibrium in the body. As a result, any pathological conditions affecting the heart or lungs affect the functioning of the other organ also.

What Is the Relationship between the Heart and the Lungs?

The heart is a triangular-shaped muscular organ. It consists of four chambers. Blood from different parts of the body enters the heart via the right atrium. From the right atrium, blood goes to the right ventricle. The right ventricle pumps blood to the lungs. The blood reaches the lungs through pulmonary blood vessels. After reaching the lungs the deoxygenated blood is transformed into oxygenated blood through gaseous transfusion. Oxygenated blood then comes to the left atrium. From the left atrium, the blood goes to the left ventricle. The left ventricle pumps the blood to circulate into the whole body.

Anatomically the shape and the structure of the right ventricle are similar to the left ventricle. But the right ventricle is one-sixth the mass of the left ventricle. The passage of blood from the heart to the lungs and then back to the heart takes place via pulmonary circulation. Pulmonary circulation comprises arteries, veins, and lymphatic systems. The arterial circuit for pulmonary circulation arises from the right ventricle. The pulmonary artery is divided into numerous small branches. Numerous arteries, arterioles, and capillaries arise from the pulmonary artery. The thickness of the pulmonary artery is approximately one-third of the other arteries but the diameter is more. This creates less resistance (one-tenth of the systemic circulation) to the circulatory blood.

The pulmonary veins are formed by the anastomosis of the venules. These venules receive blood from capillaries around the alveoli. The pulmonary veins are also thinner with sustainable properties. These facilitate carrying more blood to the left atrium and also reduce the resistance of blood circulation. The lymphatic drainage of the pulmonary circulation help to remove accumulated fluid around pulmonary circulation.

What Is the Effect of Chronic Lungh Disorder?

Chronic lung diseases are responsible for several changes in the systemic circulation. Several changes in the physiologic conditions lead to this. One of the main effects of chronic lung disease is a lack of oxygen supply. This leads to the activation of chemoreceptors which causes dilation of the peripheral blood vessels. But pulmonary blood vessels are constricted. This pulmonary vasoconstriction helps to maintain ventilation and perfusion in the alveoli. This causes an increase in pulmonary artery pressure. This increase in pressure is ultimately responsible for pulmonary hypertension and an increase in vascular resistance. Asa result, a rise in cardiac output is observed.

Another factor, that is associated with such changes is hypercarbia. In this condition, the concentration of carbon dioxide in the blood is also increased. This causes hyperventilation and constriction of pulmonary blood vessels. Though, peripheral blood vessels are dilated.

In long-standing cases this can lead to the following changes:

  1. Change in the morphology of the pulmonary vasculature. Muscularization and proliferation of the vascular media and intima (layers of the blood vessels) lead to the alteration in the tone of the pulmonary blood vessels.

  2. Long-standing infection and inflammation lead to the loss of pulmonary vascular surface area.

  3. Chronic lung diseases are associated with changes in the viscosity of the blood.

All these factors are responsible for increased vascular resistance in the pulmonary circulation. Chronic lung diseases associated with such changes are:

  1. Chronic obstructive pulmonary disorder (COPD).

  2. Lung fibrosis.

  3. Interstitial lung disorders.

  4. Cystic fibrosis.

  5. Pulmonary embolism.

What Are the Effects on the Heart?

Changes in the pulmonary circulation, increased resistance of the pulmonary circulation, and pulmonary hypertension lead to increased preload and afterload on the ventricles. Cardiac output is also increased. Hypercapnia (elevation in the carbon dioxide tension in the blood vessels) is responsible for alterations in renal blood flow. As a result, water and salt absorption in the kidney is hampered. Vasodilation of the peripheral blood vessels is responsible for circulatory stasis. This is associated with the accumulation of fluid in the periphery.

All these factors lead to increased stroke volume, increased heart rate, and cardiac output. Swelling of the leg and accumulation of fluid in the peripheral blood vessels are also seen.

Increased pulmonary pressure and pulmonary hypertension are associated with increased afterload. As a result, increased force is necessary for the right ventricle to pump blood into the lungs. This causes hypertrophy (increased in size) of the right ventricle. Left-sided heart disorders are uncommon but can be observed in some conditions. Increased age, smoking, and COPD are potential risk factors in the development of left-sided lung disorders.

What Are the Symptoms?

The symptoms of right ventricular failure or cor pulmonale or right-sided heart failure are:

  1. Discomfort in the chest, usually in the front left side of the chest.

  2. Breathing discomfort after heavy work or exercise.

  3. Chest pain.

  4. Swelling in the body specifically in the lower extremities like the ankle.

  5. Bluish discoloration of the fingers and lips.

  6. Presence of wheezing or cracking sound in the chest due to chest discomfort.

On the clinical examination following details can be found:

  1. The chest radiograph will show enlargement of the right ventricle and pulmonary artery.

  2. Electrocardiogram will show hypertrophy of the right ventricle.

  3. Doppler echocardiography can be used to detect pulmonary hypertension.

  4. Magnetic resonance imaging (MRI) can be used to determine the dimensions and enlargement of the right ventricle.

  5. Pulmonary function tests can be used to diagnose the presence of pulmonary disorders.

What Are the Treatment Options?

Treatment of the respiratory disorder is the primary mood of treatment in such cases. The oxygenation of the patient can be improved by oxygen therapy. Diuretics can be used to remove accumulated fluid from the body. Anticoagulants can be prescribed to reduce the chance of blood clot formation. ACE inhibitors and angiotensin II receptor blockers can be used to improve the functionality of the heart.

Conclusion:

The heart and the lungs are the two most vital organs in the human body. Pulmonary circulation plays a vital role in the gaseous exchange process. Chronic respiratory disorders are responsible for pulmonary hypertension and increased resistance to pulmonary circulation. This is responsible for right-sided heart failure.

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Frequently Asked Questions

Cardiac symptoms are more common in some respiratory disorders, such as severe asthma and chronic obstructive pulmonary disease (COPD). Cardiovascular strain can be exacerbated by the chronic nature and systemic consequences of certain disorders, raising the risk of cardiac problems.

It is important to evaluate the symptoms of illnesses such as asthma or COPD to distinguish between respiratory-related symptoms and cardiac indications. While cardiac symptoms, such as palpitations or chest discomfort, may indicate cardiovascular involvement, respiratory symptoms, such as wheezing and shortness of breath, are frequently linked to airways-related diseases. Accurate diagnosis and suitable therapy require a thorough medical evaluation, including a physical examination, clinical history, and diagnostic testing.

Chest discomfort in respiratory disorders may not always indicate a heart issue. Inflammation of the chest wall or strained respiratory muscles are other possible causes. If the chest discomfort is severe or accompanied by other serious symptoms, however, it is crucial to seek medical attention to rule out any cardiac involvement.

Chest discomfort in respiratory disorders may not always indicate a heart issue. Inflammation of the chest wall or strained respiratory muscles are other possible causes. If the chest discomfort is severe or accompanied by other serious symptoms, however, it is crucial to seek medical attention to rule out any cardiac involvement.

Increased pressure in the lungs' blood arteries linked to pulmonary hypertension in respiratory illnesses exerts strain on the right side of the heart. Cardiac indications such as peripheral edema and jugular vein distention may arise from this, indicating right-sided heart failure. In respiratory diseases, monitoring and treating pulmonary hypertension are essential to preventing cardiac consequences.

Momentary heart problems may arise from respiratory illnesses. Myocarditis and the aggravation of pre-existing cardiac problems are examples of transient disorders that can result from infections that cause inflammatory reactions and stress on the circulatory system. Monitoring heart health is crucial for prompt management and intervention during respiratory infections.

Certain preventive measures can decrease the risk of cardiac problems in respiratory disorders. These include controlling respiratory diseases with medication and lifestyle changes that decrease stress on the cardiovascular system, avoiding smoking to reduce inflammation and pressure on the heart, and engaging in regular exercise to promote cardiovascular health.

The severity of a respiratory illness can influence the probability of experiencing cardiac symptoms. When respiratory disorders deteriorate, the cardiovascular system may be under more stress, which might result in the development of cardiac symptoms. Effectively treating respiratory disorders is essential to reduce the likelihood of related heart problems.

Cardiac symptoms in respiratory infections may be more common in certain demographic groups. Several factors, including age, pre-existing cardiovascular problems, and general health, can cause variations in susceptibility. Specific treatments and close monitoring may be required for people in these demographic groups to manage possible cardiac problems during respiratory infections.

Several diagnostic techniques are used to determine if the heart is involved in respiratory disorders. These might include cardiac biomarker analyses, echocardiograms, and electrocardiograms (ECG or EKG), which together aid in evaluating heart health and identifying any potential cardiac issues linked to respiratory conditions.

Cardiac symptoms may improve if the respiratory issue is treated, and vice versa. The interdependence of these physiological systems is shown by the fact that improved respiratory health management can reduce stress on the heart while treating cardiac problems, which may have a good effect on respiratory function.

Certain drugs are useful in treating cardiac and respiratory symptoms simultaneously. For instance, angiotensin-converting enzyme (ACE) inhibitors and beta-blockers may be used to treat respiratory disorders and heart problems. However, the individual's unique medical needs and conditions will determine which drugs are best, and optimal treatment needs to be discussed with a healthcare provider.

Exercise and diet are important lifestyle factors that impact the risk of heart problems in respiratory disorders; maintaining a heart-healthy diet and engaging in regular exercise help to improve cardiovascular health by reducing the workload on the heart and the chance of cardiac issues related to respiratory disorders.

Those with respiratory conditions must be on watch for any warning indications of possible heart issues. Increased breathlessness, swollen limbs, and intensifying chest discomfort are examples of symptoms that may point to the need for immediate medical intervention to rule out and treat possible cardiac involvement.

Anxiety and stress can make cardiac symptoms worse in those with respiratory conditions. Stress may also raise blood pressure and heart rate, exacerbating the effects of preexisting cardiac problems when respiratory disorders are present.

Prolonged inflammation significantly influences how respiratory disorders affect the heart over the long run. Long-term inflammation can exacerbate cardiovascular problems by adding strain to the heart and blood vessels. This shows the need to control inflammation to avoid the negative cardiac consequences linked to respiratory illnesses.

Research projects that enhance understanding and handling of the connection between cardiac symptoms and respiratory disorders are still underway. The efforts above aim to improve diagnostic methodologies, create focused therapeutic approaches, and execute proactive measures to reduce the consequences of cardiac problems in patients with respiratory ailments.

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Dr. Kaushal Bhavsar from iCliniq
Dr. Kaushal Bhavsar

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