Atypical Presentation of Infective Endocarditis: A Case Report

The American Heart Association defines Infective Endocarditis (IE) or bacterial endocarditis as an infection caused by bac - teria that enter the bloodstream and settle in the heart lining, heart valve, or blood vessel [1]. IE is considered the fourth most common life-threatening infection syndrome after sepsis, pneumonia


Introduction
The objectives of this case report are to increase awareness of the atypical presentations of IE, to emphasize the complications of IE, to avoid unnecessary invasive treatment for patients with septic emboli secondary to IE, and to promote timely diagnosis and treatment of patients with similar clinical presentations.

Case Presentation
We present a 68-year-old Caucasian male who reported left leg weakness during his intake interview at a local hospital.The patient had been experiencing leg weakness for one week.He was admitted to the hospital due to his complaint of leg weakness and fever.
After three days, he was discharged from the hospital with the impression of a viral infection.Subsequently, the patient's symptoms worsened.He returned to the hospital one week later and was readmitted due to his inability to walk and left side and left arm weakness.
The patient is married and living with his wife.He is a former ETOH abuser and former tobacco user (20 packs/year), and stated that he is currently a nondrinker and nonsmoker.The patient has worked for several years as a tugboat operator.The patient did not report any family medical history or known drug allergies.

Medical History
The patient reported a history of Hepatitis C, diabetes mellitus type 2, gastroesophageal reflux, aortic stenosis, and primary liver cancer metastasized to the right suprarenal gland.The patient had an aortic valve replacement one year ago, adrenalectomy (right), and chemoembolization about two years ago.

Physical Examination Findings
General Appearance: The patient was alert, awake, and oriented times 3 to person, place, and time.The patient did not display signs of acute distress.

MRA:
Technique throughout the carotid arterial system bilaterally showed calcified plaque at the carotid bulbs with no flow-limiting stenosis.(Note.Image of mitral valve vegetation as shown on TEE from najms.org.)

Assessment and Diagnosis
The initial findings led to an impression of metastatic disease.After further evaluation and testing (including blood and urine cultures), the patient was given a definitive diagnosis of infective endocarditis.
It is important to note that the subsequent testing revealed two significant findings that suggested infective endocarditis by Duke criteria.(Major Duke criteria: positive blood culture tested two times, Gram-positive cocci in pairs as Streptococcus, and vegetation on the mitral valve noted on the 2D echo 10 mm; Minor Duke criteria: Murmur, systolic murmur on the apex MR, and hemorrhagic stroke [4].)The patient suffered acute hemorrhagic CVA secondary to septic cardioembolism.
Picc line for long-term IV ABX, 6 weeks.

Case Discussion
Preliminary impression for the patient was a large intraparenchymal hemorrhage likely secondary to metastatic disease since the patient had a history of hepatic cancer versus coagulopathy thrombocytopenia.
During day 1 and 2 of treatment, the patient's MRI showed sizeable dominant hemorrhage in the right posterior parietal lobe demonstrating peripheral enhancement-which can be seen in metastatic disease but can also be due to the subacute phase of hemorrhage/ischemia.The findings showed large intraparenchymal hemorrhage, likely secondary to septic emboli.These findings contributed to the impression of metastatic disease, but other conditions were considered possible.
The care providers discussed differential diagnoses for amyloidosis (less likely because the bleeding area), an aneurysm, AV malformation, and Traumatic Brain Injury (TBI); however, the patient did not report any trauma.Approximately day 4, the care providers suspected IE.
On day 4 of treatment, an echocardiogram was ordered.An annular calcification in the mitral valve was observed as was mild thickening and normal leaflet separation and possible, mobile vegetation measuring 10 mm x 26 mm.The transmitral velocity was within normal range.There was moderate regurgitation and no evidence of stenosis.
After reviewing the additional findings, an Infectious Disease (ID) inter-consult was completed.Blood and urine cultures were taken.The blood culture was positive for Gram-positive cocci (Enterococcus faecalis).TTE and TEE confirmed mitral valve vegetation.The definitive diagnosis was determined as bacterial endocarditis (2 major Duke criteria) with septic embolic and hemorrhagic bleeding.
The management of the condition was focused on continuing patient treatment with vancomycin, ceftriaxone, and ampicillin/ sulbactam (Unasyn); IV for 6 weeks.
The patient was discharged from the facility with close followup by the ID internist (infection disease specialist), a cardiologist, and a cardiothoracic surgeon.Mitral valve replacement was not needed.However, it was recommended to continue monitoring the bacteremia to assess the need for possible heart surgery and removal of the prosthetic valve.

Considerations Regarding IE
Complications of IE include cardiac, neurologic, renal, musculoskeletal; and complications related to systemic infection, such as embolization, metastatic infection, and mycotic aneurysm.These complications can co-occur and can be considered based on pathogenesis; such as cerebral infarct (embolic), heart valve destruction (the local spread of infection), vertebral osteomyelitis (metastatic infection), and glomerulonephritis (immune-mediated damage).
It has been researched and described that IE should be considered a possible etiology if the patient displays symptoms of systemic arterial embolization.The likelihood of IE is increased in patients with cerebral and systemic arterial embolization [6,7].
Echocardiography is central to the diagnosis and management of patients with IE.Evidence of an oscillating intracardiac mass or vegetation, an annular abscess, prosthetic valve partial dehiscence, and new valvular regurgitation are significant criteria in the diagnosis of IE [1].Definitive diagnosis of IE can be made based on clinical manifestations, blood cultures, and echocardiography.Additional evaluations for patients with suspected IE include electrocardiography, chest radiography, and other radiographic imaging targeting clinical manifestations [8].

Suggested Guidelines for the Timely Assessment and Treatment of IE
During an intake interview, it is essential to assess a patient with a prosthetic heart device, a history of surgeries, or recent dental procedures.It is imperative to highlight cerebral and systemic arterial embolization as related complications of IE.The risk of embolization in the setting of native valve endocarditis is 13 to 44 percent, and in many cases embolization occurs before a diagnosis of IE has been established.Among patients with IE, risk factors for embolization include vegetation size >10 mm; vegetation mobility; vegetation location on the anterior mitral leaflet; prior embolization; and infection with Staphylococcus aureus, Streptococcus bovis, or fungus.
In a multicenter study of 384 patients with definitive IE (75 percent with native valve endocarditis), S. aureus and S. bovis were predictors of total embolic events, while vegetation length >10 mm and severe vegetation mobility were significant predictors of embolic events after initiation of antibiotic therapy.It is clear that the incidence of septic emboli in the setting of infected endocarditis depends on the size of the vegetation and the type of infective microorganism [9].In patients with major ischemic stroke or intracranial hemorrhage, it is recommended to delay valve surgery for at least four weeks (Class IIa; Level of Evidence B) [1].

Conclusion
Many complications are commonly observed in patients with infective endocarditis.Even though cardiac complications are the most common, neurologic and septic complications are the leading cause of death in patients with infective endocarditis [5].The advantages of timely diagnosis and treatment for this patient-and patients with similar histories and presentations-include avoiding unnecessary and invasive interventions, and possible death.By presenting this case report, it is proposed that care providers can more readily recognize infective endocarditis and its atypical presentation in similar settings and circumstances.
): Mildly echogenic liver (possibly secondary to fatty infiltration); prominent portal vein.(This raised the consideration of early portal hypertension.It was suggested to correlate further with clinical findings.)TEE: Transesophageal echocardiography (below).
Echocardiography should be performed directly in patients suspected of IE (Class I; Level of Evidence A) [1].At least three sets of blood cultures obtained from different venipuncture sites should be obtained, with the first and last samples drawn at least one hour apart.(Class I; Level of Evidence A) [1].TEE should be performed if initial TTE images are negative, or inadequate in patients for whom there is an ongoing suspicion for IE, or when there is a concern for intracardiac complications in patients with an initial positive TTE (Class I; Level of Evidence B) [1].If there is high suspicion of IE despite initial negative TEE, then repeat TEE is recommended in 3 to 5 days, or sooner if clinical findings change (Class I; Level of Evidence B) [1].Repeat TEE after initial positive TEE if clinical features suggest a new development of intracardiac complications (Class I; Level of Evidence B) [1].It is fundamental to obtain at least two sets of blood cultures every 24 to 48 hours until the bloodstream infection has cleared (Class IIa; Level of Evidence C) [1].If operative tissue cultures are positive, then an entire antimicrobial course is indicated after valve surgery (Class IIa; Level of Evidence B) [1].
Early valve surgery in left-sided NVE (during initial hospitalization and before completion of a full course of antibiotics) is indicated in patients with IE who present with valve dysfunction resulting in symptoms or signs of heart failure (Class I; Level of Evidence B) [1].Valve surgery may be considered without delay in IE patients with stroke or subclinical cerebral emboli and residual vegetation if imaging studies have excluded intracranial hemorrhage and if neurological damage is not severe (Class IIb; Level of Evidence B) [1].