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Pyridoxine-Deficient Streptococcus: An Uncommon Virulent Cause of Subacute Destructive Aortic Valve Endocarditis

Abdullah Ahmad1, Zachary Banbury1, Enrique Baez1

  • 1Internal Medicine, Englewood Hospital and Medical Center, Englewood, USA.

Cureus
|April 12, 2022
PubMed

Insights

Nutritional variant streptococcus (NVS) causes infective endocarditis (IE), presenting diagnostic challenges and poor outcomes. Early recognition and aggressive treatment, including surgery, are crucial for managing NVS IE.

Area of Science:

  • Infectious Diseases
  • Cardiology
  • Microbiology

Background:

  • Nutritional variant streptococcus (NVS) is a rare pathogen causing infective endocarditis (IE).
  • NVS IE presents diagnostic difficulties due to challenging organism isolation.
  • This condition is associated with high rates of treatment failure, recurrence, and mortality.

Observation:

  • A 52-year-old male presented with symptoms suggestive of chronic infection: fatigue, cyclic fever, night sweats, and weight loss.
  • The patient's condition necessitated aggressive management due to disease severity and embolic risk.

Findings:

  • Diagnosis of NVS IE is often delayed due to difficulties in isolating the organism.
  • Successful management involved culture-directed antibiotics and surgical aortic valve replacement.

Implications:

  • This case underscores the clinical importance of NVS in infective endocarditis.
  • Prompt diagnosis and aggressive, potentially invasive, treatment strategies are vital for improving outcomes in NVS IE.
  • Further research into optimal diagnostic and therapeutic approaches for NVS IE is warranted.
Keywords:
abiotrophiacardiovascular systeminfective endocarditisnutritional variant streptococcuspyridoxal-dependent streptococcus

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