Related Experiment Videos
[Concealed infective endocarditis]
1Research Laboratory for Cardiovascular Pathology, Juntendo University School of Medicine, Tokyo.
Abstract:
The occurrence of concealed infection or "natural remission" in infective endocarditis was investigated microscopically in 35 consecutive patients (36 valves) with infective endocarditis (between April 1987 and May 1995). Four patients were considered as having concealed or silent infective endocarditis. Preoperative diagnosis of these patients was mitral valve prolapse, rheumatic aortic valve stenosis with insufficiency, aortic valve prolapse and hypertrophic cardiomyopathy, respectively. These patients did not present with any clinical signs of infective endocarditis such as cardiac murmur and ventricular dysfunction. Histological examination of the excised valves revealed valvular perforation, small round cell infiltration, neovascularization, remnants of vascular smooth muscle cells, and organizing vegetations. These findings are consistent with the histological findings of infective endocarditis. Latent infective endocarditis may be present without inflammatory manifestation.
Insights
Microscopic investigation revealed that infective endocarditis can occur silently, without typical clinical signs. Histological findings confirmed latent infective endocarditis in patients without apparent symptoms.
Area of Science:
- Cardiology
- Pathology
- Infectious Diseases
Background:
- Infective endocarditis (IE) is a serious infection of the heart valves.
- Clinical diagnosis often relies on characteristic signs like cardiac murmurs and ventricular dysfunction.
- The possibility of IE occurring without these overt manifestations is less understood.
Observation:
- A microscopic study examined 36 valves from 35 patients with infective endocarditis.
- Four patients presented with concealed or silent infective endocarditis.
- Preoperative diagnoses included mitral valve prolapse, aortic valve stenosis, and hypertrophic cardiomyopathy, with no IE symptoms.
Findings:
- Histological examination of excised valves revealed characteristic signs of infective endocarditis.
- These included valvular perforation, inflammatory cell infiltration, neovascularization, and organizing vegetations.
- These microscopic findings confirmed IE despite the absence of clinical manifestations.
Implications:
- Latent infective endocarditis can exist without detectable clinical signs or symptoms.
- This suggests a need for considering microscopic evaluation in specific patient groups.
- Understanding silent IE is crucial for timely diagnosis and management to prevent complications.