infective endocarditis and heart masses
TRANSCRIPT
Dr. Fuad Farooq
INFECTIVE ENDOCARDITIS AND HEART MASSES
Infective Endocarditis
IntroductionInfective endocarditis occurs primarily on cardiac
valves but can involve other endocardial surfaces or intracardiac devices
Potentially fatal with 6 month mortality rate of 25 to 30%
The incidence of IE is higher in patients who have valvular heart disease (rheumatic valve, bicuspid aortic valve, mitral valve prolapse, or prosthetic valve) or congenital heart disease and among intravenous drug users
Most commonly mitral and aortic valves are involved but involvement of right side of heart is not uncommon, especially in intravenous drug users
Hydraulic features of the blood stream are important in the pathogenesis of endocarditis
Associated with a high-pressure source (i.e., aorta, left ventricle) that drives blood at a high velocity through a narrow orifice (coarctation, PDA, VSD, AR or MR or obstructive hypertrophic cardiomyopathy) into a low-pressure chamber
Introduction
Rodbard S. Blood velocity and endocarditis. Circulation, 1963;27:18-28
Since the 1st M-Mode echo observation of valvular vegetation in 1973, the role of echo in diagnosing IE has grown in conjunction with improvement in resolution and technology including Doppler echocardiography, color flow imaging, and transesophageal echocardiography (TEE)
Indeed the echo detection of vegetation is one of the two major diagnostic criteria for IE
Introduction
American Heart Journal, 1973;86:698-704
Vegetation is an oscillating intracardiac mass on a valve or supporting structure or in the path of regurgitation get or an iatrogenic device
Can be linear, round, irregular or shaggy and frequently show high frequency flutter or oscillation
Echocardiographic Appearance
Echocardiographic Appearance
Other associated findings AbcessesNew partial dehiscence of prosthetic valveNew valvular regurgitation
Initial attachment to MV and TV is usually on atrial side
An aortic vegetation usually start from ventricular surface
Echocardiographic Appearance
The sensitivity of 2D echo for the detection of vegetation depends on the size and location of the vegetation and echocardiographic window used
The sensitivity for detection of vegetation with TTE is 65 to 80% when size of vegetation <1cm and with TEE is 95%
For prosthetic endocarditis the diagnostic yield of TTE is especially poor, but the sensitivity of TEE is 90%
Echocardiographic Appearance
Journal of the American College of Cardiology, 1989;14:631-38 Journal of the American College of Cardiology, 1991;18:391-97
The vegetation on the right side of the heart are larger (mean diameter 17mm) than those on the left side
Vegetations frequently persist after successful medical treatment, however persistent vegetation are not independently associated with the late complication
Echocardiographic Appearance
Complications arise from primarily from Vegetation embolizationDestruction of valve or intracardiac structuresAbcesses and subsequent haemodynamic
deteriorationIn the left sided valve endocarditis, the frequency of
clinical complications increased with the greater mobility and size of vegetation
When vegetations were larger than 11 mm, 50% or more of patients developed at least one complication of infective endocarditis
In patients with tricuspid valve endocarditis, PE is the most common complication 69%
Complications
StructuralCusp or leaflet rupture/flailPerforationAbscessAneurysmFistulaDehiscence of prosthetic
valvePericardial effusion (more
frequent with abscess)
EmbolizationSystemicCerebralPulmonary
Hemodynamic compromiseValvular regurgitationAcute mitral regurgitationAcute aortic regurgitationPremature mitral valve
closureRestrictive mitral inflow
patternValvular stenosisShuntCongestive heart failure
Complications
When the endocardial surface is traumatized, a series of events may lead to platelet deposition, creating a nonsterile platelet fibrin thrombus
Libmann sacks endocarditis: (Associated with APLA)This condition usually involve mitral valve and
is found most commonly on the basal portion of MV but it can extend to the cordal structure or papillary muscles
The lesions are difficult to see with TTE
Non-bacterial Thrombotic Endocarditis
Young maleIntravenous drug abuserPresented with fever, pedal edema and
shortness of breath
Case
Vegetation on Prosthesis
Vegetation on Shunts
A metastatic tumor also can involve cardiac valves and produce lesions similar to those in Libman-Sacks endocarditis. This is called marantic endocarditis and occurs most commonly with Hodgkin disease and adenocarcinoma of the lung, pancreas, stomach, and colon
Marantic Endocarditis
Several limitations and pitfallsOther lesions of the valves, such as marked
myxomatous degeneration of the mitral valve, nonbacterial thrombotic endocarditis or tumor, thrombus attached to the valve (i.e., papilloma), may simulate or mask vegetations
When a valve is sclerotic, calcified or prosthetic, it is more difficult to visualize a vegetation - TEE may be useful
Clinical presentation and lab data need to be incorporated into the interpretation of the echocardiographic findings
Clinical Caveats
TUMORS AND MASSES
Detection of a large intracardiac mass is an impressive experience for clinical echocardiographers
Some cardiac masses are suspected from the clinical presentation of the patient and other are incidental findings
Occasionally, a normal structure or a variant of a normal structure may appear as an intracardiac mass
Accurate diagnosis is crucial because misinterpretation may lead to an incorrect management strategy, including an unnecessary surgical procedure
Cardiac Masses
Cardiac masses can be classified as Cardiac tumorThrombusVegetationIatrogenic materialNormal variantExtracardiac structure
These masses usually can be differentiated by their size, shape, location, mobility and attachment site as well as by their clinical presentation
Cardiac Masses
Echo Indications in Cardiac Masses
Although primary cardiac tumors usually are benign, they can cause systemic symptoms, embolic events, malignant arrhythmias, chest pain, and heart failure
So, it is recommended that cardiac tumors be removed whenever possible
They can beBenignMalignant
Primary Secondary
Cardiac Tumor
Tumor and Masses
Tumor and Masses
Not all masses detected with echocardiography are thrombus or intracardiac tumor
The normal appearance of cardiac and extracardiac structures can be misinterpreted as an intracardiac mass
…Normal Anatomic Varients
…Normal Anatomic Varients
…Normal Anatomic Varients
Cordae
Lipomatous Interatrial Septum
Moderator Band
Moderator Band
Reverberation Artefact
Papillary Muscle
Pacemaker Lead
Chiari Network
Lamble’s
Myxoma is the most common cardiac tumor, accounting for 20 to 30% of intracardiac tumors
LA is the most common location with attachment site at the atrial septum
Typical M-mode and 2D echo appearanceOther locations and attachment sites have
been observed including RA, RV, LV and atrioventricular valve
Atypically located myxoma is usually familial - Carney Complex
Familial atrial myxomas account for 7% of all atrial myxomas
Myxoma
Atrial myxoma appear gelatinous and friable with occasional central necrosis
Embolic events are more common with a small myxoma
These tumors can obstruct AV valveYearly echo is indicated after resection of
myxoma at for 5 years
Myxoma
Fibromas usually are located in the LV free wall, ventricular septum or at the apex
It is well demarcated from surrounding myocardium by multiple calcifications
May grow in LV cavity and interfere with LV fillingPotential problems resulting from a fibroma are
congestive heart failure and malignant arrhythmias
When the tumor is located at the apex, the condition may be misinterpreted by other imaging modalities as apical hypertrophic cardiomyopathy
Cardiac Fibroma
It is the most common cardiac tumor in children, particularly those with tuberous sclerosis
Rhabdomyomas are often multiple, found in RV, RVOT and even in pulmonary artery
May be diagnosed before birth with fetal echo
Rhabdomyoma may regress spontaneously after birth
Cardiac Rhabdomyoma
It is a benign intracardiac tumor, found in the endocardium
These tumors are usually small (mean size 12 into 9 mm) and have characteristic stippled edge with shimmer or vibration at the tumor blood interface
Most frequently papillary fibroelastomas are located on the aortic valve (either aortic or ventricular surface), TV, PV, Septum, LV free wall, RVOT and LA
90% of patient have single tumor and other 10% have multiple tumors
Papillary Fibroelastoma
Primary cardiac pheochromocytomas is very rare but it has characteristic location, size and shape
Found mostly in AV grove, well circumscribed and ovoid, ranging from 1.5 to 5.1 cm
Common in female (mean age 38 years)Coronary angio shows that the tumor has
coronary neovascular blood supply
Pheochromacytoma
Malignant primary cardiac tumors include Angiosarcoma Rhabdomyosarcoma Myxosarcoma Osteosarcoma Fibrosarcoma Synovialsarcoma
Angiosarcoma occur commonly in RA in conjuction with paricardial effusion
Rhabdomyosarcoma and fibrosarcoma can occur any where in the heart
Synovial sarcoma is rare and occurs in RA
Malignant Tumors
Frequently secondary malignant tumors metastasize from lungs, breast, kidney, liver, melanoma, osteogenic sarcoma
Whenever RA mass is detected, the IVC should be scanned carefully
Secondary tumor
Secondary tumor
RA thrombus: Thrombi from lower extremity deep vein must
go through RA to pulmonary circulation They are mobile, have a characteristic popcorn
or snake like appearance Almost always are associated with pulmonary
embolism
Thrombus
RV thrombus
Thrombus
LA Thrombus: Common in mitral stenosis or atrial fibrillation Infrequently occurs as a paradoxical embolus from
an RA thrombus passing through a patent foramen ovale
TTE is limited in detecting thrombus in LAA In all patients, the LA appendage is visualized from a
transesophageal window
Thrombus
LV thrombus Easily differentiated from a tumor because the
thrombus is almost associated with akinetic to dyskinetic myocardium underlying the thrombus
Contrast echo can be very helpful in identifying and evaluating an apical mass/thrombus
Thrombus
IVC CLOT
Thrombus
caseYoung femaleWith chest pain
Another case
Take Home Message
Take Home Message
Take Home Message