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When Two Chambers Collide: A Rare Case of an Acquired Gerbode Defect in Infective Endocarditis
Elizabeth R Rimsky1, Aysan Sattarzadeh1, Kaiyu Jia1
1Department of Medicine, Northwell at Staten Island University Hospital, Staten Island, USA.
Insights
This case report details a rare acquired Gerbode defect, a left ventricle-to-right atrium shunt, resulting from group B Streptococcus infective endocarditis. Early diagnosis via advanced imaging is crucial for managing this serious cardiac complication.
Area of Science:
- Cardiology
- Infectious Diseases
- Cardiac Surgery
Background:
- The Gerbode defect is a rare cardiac anomaly involving abnormal communication between the left ventricle and right atrium.
- While often congenital, acquired Gerbode defects can arise from myocardial infarction or infective endocarditis.
- Group B Streptococcal bacteraemia is an uncommon cause of infective endocarditis in adults, carrying significant risks.
Purpose of the Study:
- To report a unique case of an acquired Gerbode defect secondary to multivalvular infective endocarditis caused by group B Streptococcus.
- To emphasize the importance of advanced imaging in diagnosing complex cardiac complications.
- To discuss the management challenges and outcomes in such rare cases.
Main Methods:
- A 64-year-old male patient with fever and dyspnoea was diagnosed with group B Streptococcal bacteraemia.
- Transoesophageal echocardiography (TOE) and cardiac magnetic resonance imaging were utilized for comprehensive evaluation.
- Clinical, microbiological, and imaging data were integrated for diagnosis and management planning.
Main Results:
- Diagnosis of multivalvular infective endocarditis with a newly identified left ventricle-to-right atrium shunt (Gerbode defect) was confirmed.
- Cardiovascular magnetic resonance imaging corroborated the acquired nature of the defect.
- Surgical intervention was deemed high-risk, leading to conservative management and palliative care initiation.
Conclusions:
- Acquired Gerbode defects are rare but critical complications of infective endocarditis.
- Group B Streptococcus endocarditis in adults, particularly with prosthetic valves, presents a high risk of mortality and complications.
- Early transoesophageal echocardiography is vital for detecting structural complications in infective endocarditis.
Introduction:
The Gerbode defect is a rare cardiac anomaly characterised by abnormal communication between the left ventricle and right atrium. Although primarily congenital, it can also be acquired, typically as a complication of myocardial infarction or infective endocarditis. This report examines a unique case of multivalvular infective endocarditis caused by group B Streptococcal bacteraemia, which led to the development of an acquired Gerbode defect.
Case Description:
A 64-year-old male patient presented with symptoms of fever and dyspnoea and was diagnosed with group B Streptococcal bacteraemia. Transoesophageal echocardiography (TOE) and cardiac magnetic resonance were used to assess the extent of valvular involvement and detect any underlying structural abnormalities. Comprehensive clinical, microbiological and imaging evaluations were performed to confirm the diagnosis.
Discussion:
A transthoracic echocardiography revealed multivalvular vegetations and a newly detected left ventricle-to-right atrium shunt, consistent with a Gerbode defect. Cardiovascular magnetic resonance imaging confirmed the acquired defect. Surgery was considered but deemed too high a risk due to the likelihood of postoperative dialysis and a greater than 50% morality risk. After discussing these risks, the patient and family opted for conservative management, and palliative care was initiated.
Conclusion:
This case highlights the rare development of an acquired Gerbode defect in the context of multivalvular infective endocarditis due to group B Streptococcus. Early diagnosis using advanced imaging techniques is critical for proper management. Surgical intervention remains a key therapeutic option, and a multidisciplinary approach is essential for optimising patient outcomes in such complex cases.
Learning Points:
An acquired Gerbode defect (left ventricular to right atrial shunt) is a rare but critical complication of infective endocarditis.Infective endocarditis caused by group B Streptococcus in adults, though uncommon, carries a high risk of complications and mortality, especially in prosthetic valve patients.Early transoesophageal echocardiography is essential for identifying structural complications of infective endocarditis.
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