Patent foramen ovale (PFO) is an anatomical feature associated with incomplete closure of the oval window, which normally closes after birth. This is a physiological opening between the right and left atria of the heart that exists in the fetus and closes during birth. In most people, the oval window closes in the first months of life, but in some cases it remains open, which can lead to various cardiac consequences. A patent foramen ovale can be associated with various cardiovascular pathologies, such as arterial embolism, migraine, or even stroke, especially if there are accompanying factors that contribute to an increase in pressure in the right atrium.
History of the disease and interesting historical facts
The history of the discovery and study of the patent foramen ovale has its origins in the development of anatomy and cardiology. In the 17th century, the Italian anatomist Marcello Malpighi was the first to describe the structure of the heart and its vascular system. However, it was only in the 19th century, with the development of physiology and understanding of the function of the heart, that it became obvious that the oval window plays an important role in hemodynamics. An interesting fact is that the study of the effect of the patent foramen ovale on human health became relevant only in the 20th century, when cases associated with arterial embolism and strokes in young people were documented. In the 1980s, active study of this condition began, which soon led to improved methods of diagnosis and treatment.
Epidemiology
According to modern studies, the prevalence of patent foramen ovale in the population ranged from 10% to 25%, making it one of the most common congenital heart defects. This condition is more often detected in young people, but many patients may not know about the presence of this defect throughout their lives. According to the results of the work of a large group of researchers, conducted in long-term observations, it was found that in 30%-40% patients with ischemic stroke under the age of 55, patent foramen ovale is a concomitant factor. It was also noted that 66% patients with migraine with aura had patent foramen ovale, which emphasizes its important role in medical practice.
Genetic predisposition to this disease
Research suggests that patent foramen ovale may have a genetic predisposition. Some of the genes involved are related to connective tissue development and cardiovascular development. Specifically, the following mutations and genes are being considered:
- Genes responsible for collagen synthesis (COL1A1, COL3A1), which play a key role in the formation and integrity of heart tissue.
- Genes associated with folate metabolism, such as MTHFR, may influence the risk of thrombotic events in patients with patent foramen ovale.
- Some studies have highlighted chromosomal abnormalities, such as Down syndrome, which may increase the risk of developing the condition.
These data highlight the importance of genetic predisposition to PFO and the need for further research in this area.
Risk factors for the development of this disease
There are several risk factors that may contribute to the development of a patent foramen ovale or its clinical manifestations:
- Hereditary predisposition - the presence of a family history of cardiovascular diseases in close relatives.
- Disturbances during pregnancy, including toxicosis and fetal hypoxia.
- History of blood clots, especially in young people.
- Lifestyle: smoking, alcohol abuse and low levels of physical activity.
- Other diseases - connective tissue diseases and syndromes associated with problems in the development of the vascular system.
These factors can both promote the opening of the oval window and influence its clinical course.
Diagnosis of this disease
Diagnosis of patent foramen ovale involves a number of methods and tests. The main symptoms that may indicate the presence of this condition include:
- Frequent headaches or migraines.
- Stroke-like symptoms include numbness, weakness on one side of the body, and speech impairment.
- Valid or asymptomatic euphoria.
Laboratory studies are generally non-specific but are important to exclude other conditions. Radiologic tests such as echocardiography are the mainstay of diagnosis. Transesophageal echocardiography has shown high sensitivity in detecting patent foramen ovale. In some cases, invasive procedures such as right atrial catheterization are necessary. The differential diagnosis includes exclusion of other causes of migraine, stroke, and cardiogenic embolism.
Treatment
Treatment of patent foramen ovale is individualized depending on the clinical situation and severity of symptoms. General treatment may include fluid replacement and blood pressure control. Pharmacological treatment includes the administration of antiplatelet agents and anticoagulants to prevent thrombus formation:
- Aspirin
- Clopidogrel
- Marivaroxaban
Surgical treatment involves closure of the patent foramen ovale by transcatheter closure, which is considered the method of choice for patients with a high risk of embolism. Other treatments may include rehabilitation programs and lifestyle modifications.
List of medications used to treat this disease
- Aspirin
- Clopidogrel
- Rivaroxaban
- Apixaban
- Serotonin antagonists for migraine prevention
These drugs help control symptoms and reduce the risk of blood clots.
Disease monitoring
Monitoring of the patent foramen ovale includes regular checks aimed at assessing its condition and dynamics. Control stages may include:
- Periodic echocardiographic studies to assess the size and function of the heart.
- Assessment of clinical symptoms and their dynamics.
- Monitoring platelet levels and other parameters that influence the risk of embolism.
The prognosis for a patent foramen ovale depends on age, the presence of comorbidities, and compliance with doctor recommendations. Complications may include recurrent strokes, blood clots, and heart failure.
Age-related features of the disease
The course of a patent foramen ovale may vary among age groups. In neonates and infants, it is most often undetected, while in adolescents and young adults, clinical symptoms may occur. Adults with a patent foramen ovale may have significant risks compared to healthy peers, especially during physical activity and decompression conditions, such as when flying at altitude.
Questions and Answers
- How can a patent foramen ovale affect health? It may increase the risk of blood clots, heart attacks, strokes, and may be associated with frequent migraines.
- How is patent foramen ovale diagnosed? The main diagnostic method is echocardiography; in some cases, X-ray examinations and catheterization may be required.
- What are the treatment options for patent foramen ovale? Treatment can be conservative (pharmacological) or surgical, depending on the clinical picture.
- Can a patent foramen ovale close on its own? For most people, the window closes within the first few months of life, but for some it may remain open throughout life.
- What preventive measures can be taken to avoid complications? It is important to lead a healthy lifestyle, control stress levels and have regular medical check-ups.
