**5. Diagnosis**

In addition to the above mentioned clinical features and positive blood cultures, transthoracic echocardiography (TTE) greatly aids in establishing a diagnosis of IE,

#### **Figure 3.**

*Modified apical four-chamber view showing multiple vegetations on the tricuspid valve (arrow) with a dilated right atrium and right ventricle.* 

**Figure 4.**  *Colour Doppler ultrasound showing severe tricuspid regurgitation.* 

#### *Right-Sided Infective Endocarditis Secondary to Intravenous Drug Abuse DOI: http://dx.doi.org/10.5772/intechopen.84319*

especially in cases with equivocal clinical presentation. TTE allows easy visualisation of vegetations on the anteriorly located tricuspid valve and associated tricuspid regurgitation (**Figures 3** and **4**) [20, 21].

 A transesophageal echocardiography may be required in detection of vegetations on the pulmonary valve and for exclusion of left-sided valve involvement [22]. The Eustachian valve must be screened for presence of vegetations.
