Fearing a stroke, she sought examination at Tam Anh General Hospital TP HCM. Dr. Huynh Thanh Kieu, Head of Internal Cardiology 1, Cardiovascular Center, stated that the patient had a blood clot completely obstructing the artery in her left arm, blocking the blood supply to her hand. This obstruction was the reason for her persistent hand numbness, which had suddenly intensified.

Doctors treated her with anticoagulant medication to prevent the blood clot from spreading. Simultaneously, they conducted diagnostic tests to determine the origin of the clot. The results confirmed she had severe mitral valve stenosis accompanied by atrial fibrillation, which are two primary risk factors for blood clot formation within the heart.

Dr. Do Anh Tuan, from Internal Cardiology 1, Cardiovascular Center, Tam Anh General Hospital TP HCM, explained that when the mitral valve narrows, blood flow from the left atrium to the left ventricle is obstructed. This causes blood to stagnate in the left atrium, and this prolonged stagnation increases the risk of blood clot formation in the left atrium or left atrial appendage. Moreover, atrial fibrillation prevents the atria from contracting effectively, causing them to fibrillate chaotically. This leads to more blood pooling, forming blood clots that can then detach from the heart.

Most blood clots originating from the left side of the heart typically travel to the brain, leading to a stroke, or to other organs such as the kidneys, spleen, intestines, or limbs, causing infarction or acute ischemia. Ms. Lien's case, where the clot affected her arm, is less common. These are all dangerous conditions that can result in serious complications or be life-threatening if not managed promptly. Many patients admitted for stroke are only then diagnosed with atrial fibrillation or previously undiagnosed valvular heart disease.

After 5 days of treatment, Ms. Lien's hand numbness improved significantly, and she was discharged. Mitral valve replacement surgery is scheduled for her in a few weeks.

Dr. Tuan examining Ms. Lien before her discharge. *Photo: Tam Anh General Hospital*

Ms. Lien's heart condition was diagnosed based on her hand numbness, a symptom often mistaken for musculoskeletal or peripheral nerve conditions. Typically, cardiovascular patients discover their disease through typical signs such as chest pain, shortness of breath, or fatigue during exertion. Previously, she had undergone annual check-ups without any detected abnormalities or clear signs of cardiovascular disease.

Mitral valve stenosis is a silently progressing condition that develops over many years. In its early stages, the disease typically presents no symptoms, but over time, it can lead to pulmonary hypertension, heart failure, atrial fibrillation, and thromboembolism. Dr. Kieu noted, "It is highly likely that the patient had mitral valve stenosis for a long time but it remained undiagnosed, ultimately leading to atrial fibrillation and thrombotic complications."

Depending on the severity of mitral valve stenosis, doctors will recommend medical treatment, percutaneous balloon valvuloplasty, or surgical repair or replacement of the valve. Patients should adopt a healthy lifestyle, limit salt intake, manage their weight (BMI < 23), avoid alcohol and tobacco, and have regular dental check-ups to prevent infective endocarditis. If unusual signs such as shortness of breath, persistent chest pain, heart palpitations, or sudden numbness in the limbs appear, individuals should seek early medical attention to prevent dangerous complications.

Thu Ha

*Patient's name has been changed