У 26-летней пациентки разрыв мышечной перегородки в сердце вызвал одышку и боль

Six Months of Breathlessness Led Doctors to a Muscle Band Splitting Her Right Ventricle in Two She was 26 and had spent six months getting progressively more breathless. Physical activity brought on fatigue and chest pain. By the time she was assessed, her limitation was severe enough to place her in New York Heart Association class III, the category for marked restriction of ordinary activity. She reported no significant medical history and no family history of heart disease. What she had was a band of muscle inside her heart, congenital in origin, that had been quietly dividing her right ventricle into two chambers. The case was published August 26 in the World Journal of Cardiology by a team at Qassim University and Prince Sultan Cardiac Center in Saudi Arabia. A Harsh Murmur and a Thrill You Could Feel The examination findings were loud, in the literal sense. Her first and second heart sounds were normal, but there was a harsh murmur throughout systole at the left sternal border, strong enough to produce a palpable vibration on the chest wall. Her electrocardiogram showed sinus rhythm at 60 beats per minute, with the axis deviated to the right and T-wave inversion in the right-sided and inferior leads, a picture of a right ventricle under strain. Echocardiography found the cause. A prominent muscle bundle within the right ventricle had created what the authors describe as a tunnel-like obstruction, splitting the chamber into a high-pressure upstream section and a normal-pressure downstream section. One Hundred Thirty-Two Millimeters of Mercury The number that defines the severity is the pressure gradient across that narrow opening: an estimated peak of 132 mmHg. For context, the threshold above which the authors say observation is no longer appropriate is 40 mmHg. Doppler imaging showed turbulent flow tearing across the muscle bundle, and the wall between the ventricles flattened in mid-systole, the visual signature of a right chamber under high pressure. Moderate tricuspid valve leakage was present, with a gradient of 65 mmHg. Two negatives were as important as the positives. There was no pressure difference between the downstream chamber and the main pulmonary artery, and the wall between the ventricles was intact. That second finding is what makes the case unusual. Surgery Through the Right Atrium She went to the operating room for resection of the obstructing muscle bundle, approached through the right atrium. Surgeons found an abnormal fibrotic and thickened muscle at the opening of the infundibulum, the outflow region of the right ventricle. They found nothing else wrong with her heart, which confirmed on direct inspection what the echocardiogram had suggested. The condition was first described in 1867 as a constriction of the proximal infundibulum, and first treated surgically in 1962 through a partial cut into the ventricle itself. Modern practice reaches the muscle bundle through the atrium instead, and this case followed that approach. Transesophageal echocardiography during the operation showed the obstruction gradient falling to about 20 mmHg and tricuspid leakage dropping from 65 to 29 mmHg. Recovery was uncomplicated, with no surgical complications. Follow-up echocardiography at her first clinic visit and again at six months confirmed the improvement had held. She reported her symptoms had resolved and that she had no limitations in daily activity. Why Adults Slip Through the Net Double-chambered right ventricle accounts for roughly 0.5 to 2 percent of congenital heart defects. It is usually found in children and often travels with other defects. A hole between the ventricles is the most common associated defect, and the condition has also been reported alongside pulmonary valve stenosis, atrial septal defect, tetralogy of Fallot, Ebstein's anomaly, and others. The authors attribute under-recognition in adults to exactly that pattern: a varied clinical presentation combined with the absence of other congenital cardiac defects that would otherwise prompt a cardiology referral. Isolated cases in adults have been reported, including a young adult found to have no symptoms at all, but they remain rare enough that the authors treat the patient's age and the complete absence of associated defects as the distinguishing features. They classify her as type 1 under a scheme that distinguishes an anomalous muscle bundle crossing the cavity from generalized thickening of the ventricular walls. They also note that alternative causes of outflow obstruction need to be carefully excluded, including anterior deviation of the outlet septum, which can indicate more complex disease, such as tetralogy of Fallot. The prognosis argument rests on other work. A cohort followed for more than a decade after surgical correction reported no deaths and no reoperations, with no recurrence of obstruction on echocardiography. Earlier work established that the condition can first present in adulthood, and a 52-patient series documented the range of presentations. This remains a single case with six months of follow-up, which is insufficient to determine how often the isolated adult form occurs. Readers with unexplained breathlessness on exertion should raise it with a clinician rather than assume any particular cause. A carefully performed echocardiogram is generally sufficient to identify this specific problem when it is specifically sought. Key Questions Answered What is a double-chambered right ventricle? It is a congenital defect in which an abnormal muscle bundle divides the right ventricle into a high-pressure chamber and a low-pressure chamber, obstructing blood flow out of the heart. Why is this case unusual? The condition is typically diagnosed in childhood and often occurs alongside other heart defects, most commonly a hole between the ventricles. Here it was isolated and found in an adult. What symptoms did she have? Six months of progressive breathlessness on exertion, fatigue, and chest pain after physical activity, severe enough to markedly limit ordinary activity. How was it diagnosed? Transthoracic echocardiography showed the muscle bundle and a tunnel-like obstruction, with an estimated peak pressure gradient of 132 mmHg across the narrowed opening. Does everyone with this need surgery? No. The authors note that observation can be appropriate when there are no other significant lesions and the gradient stays at or below 40 mmHg without progressing. How did she do? The gradient fell to roughly 20 mmHg during surgery; recovery was uncomplicated, and improvement held at six months, with her symptoms resolved. Published by Medicaldaily.com