Infective endocarditis complicating congenital heart disease

Area of Science:

• Cardiology
• Pathology
• Infectious Diseases

Background:

• Infective endocarditis (IE) is a serious infection that can complicate congenital heart defects (CHDs).
• Understanding the pathological alterations and clinical associations of IE in CHD patients is vital for improving diagnosis and management.
• The incidence of IE in patients with major CHDs is reported as 4.7%.

Purpose of the Study:

• To investigate the pathological alterations in patients with infective endocarditis complicating congenital heart defects.
• To identify the specific types of congenital heart defects most frequently associated with infective endocarditis.
• To analyze the clinical presentation and diagnostic challenges of infective endocarditis in this patient population.

Main Methods:

• Pathological examination of 34 patients with infective endocarditis and congenital heart defects.
• Analysis of patient demographics, underlying cardiac defects, and causative microorganisms.
• Review of clinical data, including missed diagnoses and affected valve/lesion types.

Main Results:

• The study included 34 patients, with a 4.7% incidence of IE in major CHDs. Males predominated, and most patients were under 31 years.
• Fallot's tetralogy (17%), ventricular septal defect (4%), and bicuspid aortic valve (16%) were the most common associated CHDs.
• Causative microorganisms were cultured in only 29% of cases. 'Jet' lesions were infected in 14 patients. IE was clinically missed in 34.8%, particularly in children aged 3 years or younger.

Conclusions:

• Infective endocarditis presents unique pathological and clinical challenges in patients with congenital heart defects.
• Specific CHDs like Fallot's tetralogy and bicuspid aortic valve are frequently associated with IE.
• Underdiagnosis is a significant issue, highlighting the need for increased clinical suspicion, especially in pediatric patients with CHDs.