The E to A Ratio: Diastolic dysfunction on TTE

Diastolic Dysfunction

One specific echocardiographic indicator of diastolic function is the Doppler inflow velocity across the mitral valve. The normal mitral inflow pattern consists of early (E) and late (A) filling. With worsening diastolic function comes differences in the E to A ratio.

Grade I: With mild (grade I) diastolic dysfunction, the velocity of early (E) filling goes down, leading to an E/A ratio less than 1.

Grade II: If diastolic dysfunction continues to worsen, the LA pressure will increase, and late (A) filling velocity will go down as well. This causes the E/A ratio to again be >1, in a proportion that looks pretty normal. This is “pseudonormalization” and grade II dysfunction.

Grades III/IV: A further rise in LA pressure causes the E/A ratio to rise even higher. Grade III diastolic dysfunction is usually associated with a E/A ratio of > 2. If the dysfunction is irreversible (i.e. not improved with medical therapy), the diastolic dysfunction is grade IV and associated with higher morbidity & morality.

 

Redfield et al. Burden of systolic and diastolic ventricular dysfunction in the community. JAMA 2003;289:194-202.

Nagueh SF. Echocardiographic evaluation of left ventricular diastolic dysfunction. UptoDate. 2015.

Evernote Link

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s