The most widely taught mnemonic for infective endocarditis is FROM JANE, a nine-letter acronym that captures the classic clinical findings: Fever, Roth spots, Osler nodes, Murmur, Janeway lesions, Anemia, Nail-bed (splinter) hemorrhages, and Emboli. A second essential mnemonic, HACEK, covers a group of gram-negative bacteria known for causing the disease. Together these two memory aids anchor much of what students and clinicians need to recall quickly about a condition whose diagnosis depends on recognizing a pattern of scattered, sometimes subtle signs.
What FROM JANE Stands For
Each letter in FROM JANE maps to a finding that, taken alone, could mean many things but together points strongly toward infected heart valves. Here is the breakdown:
- F — Fever: The most common symptom. Persistent low-grade or spiking fevers that do not respond to routine treatment raise suspicion, especially in someone with a known heart valve problem or a prosthetic valve.
- R — Roth spots: Pale-centered hemorrhages seen on the retina during a fundoscopic exam. They result from immune-complex damage to tiny retinal blood vessels or from septic emboli causing small areas of bleeding and tissue death in the back of the eye.
- O — Osler nodes: Tender, pea-sized red or purple nodules on the pads of the fingers or toes. The tenderness is the key distinguishing feature.
- M — Murmur: A new heart murmur, or a change in an existing one, suggests that vegetations on the valve are disrupting blood flow. A new regurgitant murmur is one of the major criteria used in diagnosis.
- J — Janeway lesions: Painless, flat, red or hemorrhagic spots on the palms or soles. They are caused by septic microemboli lodging in small dermal blood vessels.
- A — Anemia: Chronic infection gradually suppresses red blood cell production and can also cause hemolysis, leading to a normocytic anemia that worsens the longer the diagnosis is delayed.
- N — Nail-bed hemorrhages: Also called splinter hemorrhages, these are thin, dark red lines under the fingernails or toenails caused by microemboli or immune-complex deposition in nail-bed capillaries.
- E — Emboli: Fragments of vegetation can break off and travel to the brain, spleen, kidneys, or lungs, causing strokes, organ infarcts, or abscesses.
Not every patient presents with every finding. Fever and a new murmur are the most frequent; Roth spots and Osler nodes are considered classic but are actually uncommon. Still, the mnemonic is useful because it reminds you to look at the eyes, hands, feet, and nails rather than focusing only on the heart.
Osler Nodes Versus Janeway Lesions
These two findings trip up students more than almost anything else in infective endocarditis, mostly because they sound interchangeable on first pass. The critical difference is pain. Osler nodes hurt; Janeway lesions do not. A study published in Chest concluded that tenderness is the only essential diagnostic distinction between the two.
A quick way to keep them straight: “Osler” starts with O, and you can think of “Ouch” for painful. “Janeway” starts with J, and you can think of “Just macules” for the flat, painless spots on the palms and soles. The underlying mechanisms differ as well. Osler nodes are thought to involve immune-complex deposition and localized vasculitis, while Janeway lesions result from septic emboli that seed small dermal vessels. In practice, both are relatively rare, but recognizing either one during a physical exam can be the clue that pushes an uncertain case toward a definitive workup.1PubMed. A consideration of the differences between a Janeway’s lesion and an Osler’s node in infectious endocarditis
Roth Spots and What They Actually Mean
Roth spots are retinal hemorrhages with white or pale centers. They are classically associated with infective endocarditis, but they are not specific to it. Leukemia, severe anemia, and other conditions involving microvascular damage can produce similar-looking lesions. In the context of endocarditis, they are thought to result from immune-complex-mediated vasculitis that damages tiny retinal vessels, or from septic emboli causing localized ischemia and focal capillary rupture in the retina.2PubMed Central. Roth’s Spots, a clinical diagnostic clue for Infective Endocarditis
Because Roth spots require a fundoscopic exam to detect, they are easy to miss if nobody looks. In a febrile patient with unexplained anemia and a heart murmur, a quick look at the retina can add an important data point. That said, their absence means nothing; plenty of confirmed endocarditis cases never show Roth spots.
The HACEK Mnemonic
HACEK stands for a group of five gram-negative bacteria that live in the mouth and upper respiratory tract and are notorious for causing endocarditis:
- H — Haemophilus species
- A — Aggregatibacter actinomycetemcomitans
- C — Cardiobacterium hominis
- E — Eikenella corrodens
- K — Kingella kingae
These organisms are part of normal oral flora but can enter the bloodstream during dental work, gum disease, or mucosal injury. They tend to grow slowly in blood cultures, which historically made them easy to miss when labs discarded culture bottles too early. Modern automated culture systems have improved detection, but HACEK endocarditis still accounts for a small but important fraction of cases, and the mnemonic is worth knowing because a positive culture for any of these bugs should immediately raise the question of endocarditis.3PubMed Central. Infective endocarditis by HACEK: a review
Organisms Beyond HACEK That Deserve Their Own Mental Flags
While HACEK has the catchy acronym, most infective endocarditis is caused by organisms that do not fit into a neat mnemonic but still carry associations worth memorizing on their own.
Staphylococcus aureus is the single most important pathogen. In developed countries, staphylococci have overtaken streptococci as the leading cause, partly because more patients now have prosthetic valves, implanted cardiac devices, and healthcare exposure that create opportunities for staph to reach the bloodstream.4PubMed. Global trends in infective endocarditis epidemiology S. aureus is also the dominant organism in intravenous drug users with right-sided (tricuspid valve) endocarditis, where it accounts for roughly four out of five cases.5PubMed Central. Tricuspid valve endocarditis
Streptococcus gallolyticus (formerly called Streptococcus bovis) deserves a special mental flag because of its strong link to colorectal tumors. Somewhere between a quarter and the vast majority of patients with S. gallolyticus bacteremia turn out to have colorectal cancer or precancerous adenomas, and a systematic review found that patients with this organism in their blood were about 3.7 times more likely to have colorectal neoplasia than controls.6Open Forum Infectious Diseases. Association of the Streptococcus bovis/Streptococcus equinus Complex With Colorectal Neoplasia: A Systematic Review and Meta-analysis That means any time S. gallolyticus shows up in a blood culture, the patient needs a colonoscopy, even if the endocarditis itself resolves.7PubMed Central. The association of Streptococcus bovis/gallolyticus with colorectal tumors: the nature and the underlying mechanisms of its etiological role
The Duke Criteria and How the Mnemonics Fit In
Diagnosing infective endocarditis relies heavily on the modified Duke criteria, a structured checklist of major and minor criteria. The major criteria are positive blood cultures with typical organisms and echocardiographic evidence of vegetations or new valve damage. The minor criteria include predisposing heart conditions, fever, vascular phenomena (Janeway lesions, emboli, mycotic aneurysms), immunologic phenomena (Osler nodes, Roth spots, glomerulonephritis), and suggestive blood cultures that do not quite meet the major threshold.
This is where FROM JANE becomes more than a study aid. Many of its letters correspond directly to minor Duke criteria. Janeway lesions and emboli are vascular phenomena; Osler nodes and Roth spots are immunologic phenomena; fever and a new murmur both appear in the criteria. The mnemonic essentially organizes the physical exam findings you need to hunt for when building a Duke criteria case.
A systematic review and meta-analysis of the modified Duke criteria found a combined sensitivity of about 85% and specificity of about 98%, with a very high positive likelihood ratio, meaning that when the criteria point toward endocarditis, they are almost always right.8PubMed. Overall Accuracy of the Modified Duke Criteria-A Systematic Review and Meta-analysis In children, a comparison of diagnostic frameworks found that the modified Duke criteria reached a sensitivity of about 88%, outperforming earlier systems.9PubMed. Value and limitations of the von Reyn, Duke, and modified Duke criteria for the diagnosis of infective endocarditis in children
Echocardiography and the Imaging Side of Diagnosis
Blood cultures and physical exam findings get you partway there, but imaging is what confirms vegetations on the valve. Two types of echocardiography are used. A standard transthoracic echocardiogram (TTE) is noninvasive and often performed first, but it misses a substantial number of vegetations. A meta-analysis comparing the two approaches found that TTE had a pooled sensitivity of about 72% when measured against transesophageal echocardiography (TEE) as the reference standard, with moderate overall diagnostic performance.10PubMed Central. Transesophageal vs. transthoracic echocardiography for infective endocarditis: a systematic review and meta-analysis An earlier study put it more bluntly: TTE fails to demonstrate nearly half of native valve vegetations.11PubMed. Sensitivity of transthoracic versus transesophageal echocardiography for the detection of native valve vegetations in the modern era
TEE involves passing a probe into the esophagus to get much closer to the heart. It is more sensitive, but it is also more invasive, requires sedation, and is not always immediately available. The practical takeaway: a negative TTE does not rule out endocarditis when suspicion is high, and TEE should follow.
PET/CT as a Newer Diagnostic Tool
For cases that remain ambiguous after echocardiography, PET/CT scanning with a radioactive glucose tracer has emerged as a useful add-on. The scan detects areas of abnormally high metabolic activity around heart valves, prosthetic material, or implanted cardiac device leads. A cross-sectional study found that PET/CT had a sensitivity of about 82% and specificity of about 96% for suspected endocarditis and device infections combined, and it reclassified 90% of patients who had initially been categorized as “possible” endocarditis under the Duke criteria, either upgrading them to “definite” or downgrading them to “rejected.”12Journal of Nuclear Medicine. Diagnostic Accuracy of 18F-FDG PET/CT in Infective Endocarditis and Implantable Cardiac Electronic Device Infection: A Cross-Sectional Study
PET/CT performs best for prosthetic valve and device-related infections. Its sensitivity rises when native valve cases are excluded, reaching above 94% in one study.13PubMed Central. Diagnostic Utility of 18 F-FDG PET/CT in Infective Endocarditis For native valve endocarditis on its own, false negatives are more common, so PET/CT works better as a complement to echocardiography and blood cultures rather than a replacement.
Why Emboli Are the Most Feared Complication
The “E” at the end of FROM JANE deserves extra emphasis, because embolic events are what make infective endocarditis so dangerous beyond the heart itself. Stroke is the most feared consequence, occurring in roughly 20 to 40% of left-sided endocarditis episodes. When brain MRI is performed on patients who have no neurological symptoms, the incidence of silent embolic events affecting the brain climbs above 70%.14PubMed Central. Embolic Events in Infective Endocarditis: A Comprehensive Review
Emboli can also seed distant arteries and cause mycotic aneurysms, which are infected outpouchings of the arterial wall that can rupture. These are uncommon (under 2% of definite cases in one large series) but associated with delayed diagnosis, intravenous drug use, and multiple embolic events.15PubMed Central. Symptomatic peripheral mycotic aneurysms due to infective endocarditis: a contemporary profile The sheer frequency of embolic phenomena explains why clinicians push hard for early diagnosis and, increasingly, for earlier surgery.
When Surgery Becomes the Treatment
Antibiotics are the backbone of treatment, typically given intravenously for weeks. But a significant proportion of patients need valve surgery during the same hospitalization. The question of when to operate has been debated for decades. A landmark randomized trial compared early surgery (within 48 hours of diagnosis) to conventional management in patients with left-sided endocarditis and large vegetations. The composite endpoint of death from any cause, embolic events, or recurrence at six months occurred in about 3% of the early-surgery group versus 28% of the conventional group.16PubMed. Early Surgery versus Conventional Treatment for Infective Endocarditis
A meta-analysis of reconstructed survival data across multiple studies confirmed that patients with a surgical indication who actually received surgery had substantially better survival at every time point through the first year, with one-year survival around 73% for the surgery group versus roughly 33% for those managed conservatively.17PubMed Central. Conservative Versus Surgical Therapy in Patients With Infective Endocarditis and Surgical Indication-Meta-Analysis of Reconstructed Time-to-Event Data European guidelines break surgical timing into emergency (within 24 hours), urgent (within days), and elective (after one to two weeks of antibiotics), while American guidelines define early surgery more broadly as anything during the initial hospitalization before completing a full antibiotic course.18PubMed Central. A narrative review of early surgery versus conventional treatment for infective endocarditis: do we have an answer? The evidence increasingly suggests that once a surgical indication is established, there is little benefit in waiting.
The Three Conditions for Endocarditis to Develop
A useful conceptual framework, though not a letter-based mnemonic, is the triad of conditions that must be present simultaneously for endocarditis to take hold: a predisposing heart abnormality (damaged valve, prosthetic material, congenital defect), bacteria entering the bloodstream, and enough virulence in those bacteria to colonize the valve surface.19J-STAGE (The Journal of Medical Investigation). Infective endocarditis and dental procedures: evidence, pathogenesis, and prevention This triad explains why antibiotic prophylaxis before dental procedures is recommended for people at high risk. A large study demonstrated a significant association between antibiotic prophylaxis use and reduced endocarditis incidence after invasive dental procedures in high-risk individuals, supporting guidelines that recommend prophylaxis for patients with prosthetic valves, previous endocarditis, certain congenital heart defects, and cardiac transplant recipients with valve problems.20PubMed. Antibiotic Prophylaxis Against Infective Endocarditis Before Invasive Dental Procedures
Right-Sided Endocarditis in IV Drug Users
Most mnemonics and teaching frameworks are oriented around left-sided endocarditis, which involves the aortic and mitral valves and carries the highest risk of systemic emboli and stroke. Right-sided endocarditis is a different clinical picture and disproportionately affects people who inject drugs. The tricuspid valve bears the brunt, and S. aureus is the culprit in about 82% of episodes in this population.21PubMed. Right-sided endocarditis in intravenous drug users. Prognostic features in 102 episodes Rather than strokes or splenic infarcts, the embolic complications go to the lungs, producing septic pulmonary emboli that show up as multiple nodular opacities on chest imaging. A patient with fever, a new murmur, and scattered lung infiltrates who uses IV drugs should raise immediate suspicion for tricuspid valve endocarditis, even though FROM JANE’s classic peripheral findings may be less prominent.
Right-sided endocarditis generally carries a better prognosis than left-sided disease. Many cases can be treated with antibiotics alone, and surgery is reserved for patients who fail to improve, have very large vegetations, or develop recurrent pulmonary emboli despite appropriate treatment.
Where Mnemonics Fall Short
FROM JANE and HACEK are excellent starting points, but they can create a false sense of completeness. The mnemonic emphasizes classic peripheral stigmata that, in reality, show up in a minority of patients. Modern endocarditis often presents with nothing more than persistent fever, malaise, and positive blood cultures in someone with a prosthetic valve or a central line. The textbook patient with Osler nodes, Janeway lesions, and Roth spots all at once is the exception, not the rule.
The shifting epidemiology of the disease is partly responsible. As rheumatic heart disease has declined in wealthier countries, healthcare-associated infections and device-related endocarditis have risen. These patients tend to be older, sicker, and less likely to present with the dramatic immune-complex findings that populate the mnemonic.22PubMed. Global trends in infective endocarditis epidemiology FROM JANE remains a useful scaffold for organizing your thinking, but the real skill lies in suspecting endocarditis in the first place, even when the patient does not look like the mnemonic.