Endocarditis

Infective endocarditis is an infection of the endocardial surface of the heart, most often a valve. It is uncommon, it is frequently missed early, and untreated it is close to uniformly fatal — which is why a patient with unexplained fever and a reason to have a susceptible heart deserves active suspicion rather than reassurance. What makes it distinctive is that it is an endovascular infection. The organism is not walled off in a tissue abscess; it is sitting on a surface washed by every litre of blood the heart moves. That single fact explains almost everything else about the disease: the persistent bacteraemia, the need for prolonged intravenous therapy, the fever that does not settle, and the sudden catastrophic complications when a fragment breaks free. This lesson is written for Canadian practical-nurse (RPN) practice. It covers recognising infection and deterioration, collecting ordered blood cultures correctly, giving and monitoring prescribed antimicrobials, caring for intravenous access, and knowing exactly when a patient has stopped being predictable and needs escalation. Laboratory values follow SI units.