Cardiac Tamponade - Causes, Symptoms, Diagnosis, and Treatment

Introduction

Cardiac tamponade is a medical condition in which blood or fluid penetrates inside the pericardium, resulting in central pressure on the heart. This penetration does not allow the heart to pump blood or function appropriately. Due to less or no blood supply from the heart, vital organs fail one after the other, and the body goes into shock.

What Is Pericardium?

The pericardium is a dual-layered protective sac encompassing the heart that is fibro-elastic in nature. A physical barrier holds the heart in place and assists in its regular functioning by lubrication. Diseases of the pericardium come into play if any swelling or fluid starts filling the pericardium. Such swellings and fluid accumulation in the pericardium are dangerous and lead to heart dysfunction. The pericardial cavity is the trim area between the pericardium and the heart. When this pericardium gets filled with blood or fluid, it results in cardiac tamponade.

What Are the Causes of Cardiac Tamponade?

The primary cause of cardiac tamponade is the tear or penetration of the pericardium. The second most common cause is pericardium infection, which can be viral or bacterial.

Some of the other causes of cardiac tamponade include:

• Swelling of the pericardium after a heart attack.

• Reaction to certain medications.

• Autoimmune and metabolic diseases such as hypothyroidism and chronic kidney failure.

• Radiation therapy.

Penetration of the pericardium can occur through trauma such as open-heart surgery, stab wounds, gunshots, punctures while locating catheters, and blunt traumas such as car accidents. In rare cases, the actual cause of cardiac tamponade remains unknown.

What Is the Pathophysiology?

The pericardium, which encloses the heart, usually contains a modest amount of physiological fluid. When the fluid volume rises quickly enough, the heart's chambers are compressed, and tamponade physiology occurs soon with significantly reduced volumes. This pressure prevents the heart's chambers from relaxing, which lowers cardiac output, filling, and venous return.

Slow-growing effusions, including those brought on by neoplasms or autoimmune diseases, can stretch the pericardium. These effusions might grow to considerable sizes before they cause tamponade physiology. Reduced diastolic filling, which results in lower cardiac output, is the fundamental pathophysiology behind cardiac tamponade. Tachycardia is one of the earliest indicators of compensating for the reduction of production.

What Are the Signs and Symptoms of Cardiac Tamponade?

The majority of the symptoms of acute cardiac tamponade abruptly occur without prior warning signs. Below are a few of the signs and symptoms of cardiac tamponade.

• Anxiety.

• Restlessness.

• Chest pain that radiates to the neck and left shoulder.

• Deep inhalation becomes very strenuous.

• Shortness of breath that leads to rapid breathing.

• Striking pulse rates.

• Large, visible veins on the neck.

Fever is a sign of an infection in the pericardium. The patient also feels dizzy and eventually loses consciousness. A classical sign of cardiac tamponade is that the chest discomfort experienced by the patient is relieved by leaning forward or sometimes even sitting down. Rarely, an acute episode of cardiac tamponade may lead to the body going into shock. This happens because the blood pressure falls extremely low. The aftermath of such a shock consists of pale skin and cold extremities.

Who Is at Risk of Developing Cardiac Tamponades?

The pericardium is more likely to become filled with fluid if one has

• Congestive heart failure.

• Cardiac surgery or procedures involving catheters.

• HIV (human immunodeficiency virus).

• Renal illness is at its latter stage.

• Autoimmune disorders.

• Cancer.

• Tuberculosis.

Does Cardiac Tamponade Happen Frequently?

Although it is uncommon, anyone can develop cardiac tamponade. According to a 2018 study, there are five occurrences of cardiac tamponade in the United States for every 10,000 hospital admissions.

How Is Cardiac Tamponade Diagnosed?

• A noticeable drop in blood pressure is the first clinical sign.

• Neck veins that are visible are the second diagnostic clue.

• The third clinical manifestation is a rapid heartbeat resulting in a muffled heart sound.

The above three diagnostic features are called Beck’s triad. After evaluating Beck’s triad, further tests can be conducted to confirm the diagnosis of cardiac tamponade. A detailed medical history is recorded because it serves as ample support for both diagnosis and treatment planning. ECG, or electrocardiogram, chest X-rays, a complete blood picture, MRI (magnetic resonance imaging), fluid analysis, and many more tests can be requested to determine the exact cause of cardiac tamponade. Getting into the depths of the condition and searching for the precise reason is vital for authentic treatment modalities.

What Is the Treatment of Cardiac Tamponade?

Cardiac tamponade is a medical crisis. If individuals start to experience an episode, seek on-the-spot preventive measures. When fluid fills the heart’s cavity, it is definitely a moment of emergency and requires immediate drainage. The most commonly used method for this fluid extraction is called pericardiocentesis.

Pericardiocentesis, or pericardial tap, is an invasive procedure done under general anesthesia. A needle and a catheter are used to drain the accumulated fluid. Rarely, this fluid may leak into the peritoneal cavity, which is a cavity that accommodates the intestines, liver, and spleen. The drained fluid undergoes multiple tests for the presence of blood, infectious agents, and even cancer cells. Therapy directed to the causative agent is prescribed in case of an infection.

Regular electrocardiograms are taken to monitor the heart's functioning. Analgesics and anti-inflammatory drugs are administered or prescribed to be taken routinely. A blood transfusion may be required in case of open-heart surgery or any invasive procedure. The healthcare provider is the right person to determine the principal line of treatment since every case of cardiac tamponade is divergent on its own.

Can Cardiac Tamponade Be Prevented?

Eating a healthy diet and exercising regularly can reduce the risk of experiencing a cardiac tamponade. A balanced diet provides all the necessary nutrients to the heart, while regular exercise keeps the heart running like an engine. Depriving the heart of these two essential requisites will only call for trouble in the near or late future. A heart-healthy diet and regular consultations with the cardiologist should be prioritized if one is already suffering from other cardiovascular diseases.

What Complications Might Cardiac Tamponade Cause?

Complications from cardiac tamponade can include:

• Cardiogenic shock.

• Cardiac arrest.

• Death.

What Is the Prognosis of Cardiac Tamponade?

The prognosis for cardiac tamponade patients is dependent upon:

• How soon do they obtain care for the illness, and what are any potential side effects?

• The root cause.

Less than 15 percent of people with cardiac tamponade die from non-cancerous causes. When cancer is the culprit, however, this rate increases to 80 percent in less than a year. Sepsis, acute renal injury, and chest injuries are associated with increased mortality rates. Patient prognosis for cardiac tamponade patients is considerably improved by timely detection and early treatment. If left untreated, the illness is lethal.

Conclusion

An episode of cardiac tamponade results from fluid lodgement within the pericardium, the protective and lubricative sac surrounding the heart. Cardiac tamponade is a medical emergency that demands instantaneous relief from pain and prompt treatment measures. Drainage of the assembled fluid within the heart’s cavity is an unavoidable management modality, which is generally invasive. The outlook after treatment is satisfactorily acceptable. But this is conditional on the diagnosis made in the nick of time. Cardiac tamponade is indeed a medical crisis that puts both the patient and their family, as well as the treating doctor, in a tight spot. Nevertheless, it is a reversible condition that may result in a positive outlook.