Transthoracic and transesophageal echocardiography for the indication of suspected infective endocarditis: vegetations, blood cultures and imaging.
BACKGROUND
The aim of this study was to investigate the ability of transthoracic echocardiography (TTE) to detect vegetations and the relationship between blood cultures and transesophageal echocardiography (TEE).


METHODS
Five hundred eleven TTE and TEE pairs performed to evaluate endocarditis were retrospectively analyzed. Vegetation on TTE, prosthetic valve, change in regurgitation, and blood cultures were correlated with vegetation on TEE.


RESULTS
TTE detected 45% of vegetations seen on TEE. There was no difference for prosthetic valves. Prosthetic valves (odds ratio, 1.7; P = .03) and increased regurgitation (odds ratio, 1.7; P = .01) were associated with vegetations on TEE; staphylococcal bacteremia and fungemia were not. Negative blood cultures were associated with negative results on TEE (P < .0001), but 27% of patients with prosthetic valves had culture-negative endocarditis or nonbacterial thrombotic endocarditis, and 6% had abscesses missed by TTE.


CONCLUSIONS
This study demonstrates a limited capacity of TTE to detect vegetations. TEE may be an appropriate initial study to evaluate prosthetic valves. TEE for culture-negative endocarditis deserves further study.
Kini
Vinay
V
Hospital of the University of Pennsylvania, Department of Medicine, Cardiovascular Division, Philadelphia, Pennsylvania, USA.
Logani
Sachin
S
Ky
Bonnie
B
Chirinos
Julio A
JA
Ferrari
Victor A
VA
St John Sutton
Martin G
MG
Wiegers
Susan E
SE
Kirkpatrick
James N
JN
D001769:Blood / Q000382:microbiology; D004452:Echocardiography; D017548:Echocardiography, Transesophageal; D004696:Endocarditis / Q000000981:diagnostic imaging* / Q000382:microbiology*; D006350:Heart Valve Prosthesis / Q000382:microbiology; D006801:Humans; D012189:Retrospective Studies; D012680:Sensitivity and Specificity