Diastolic dysfunction classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
There are four basic echocardiographic patterns of diastolic heart failure, which are graded I to IV.
Grade I
The mildest form is called an "abnormal relaxation pattern", or grade I diastolic dysfunction. On the mitral inflow Doppler echocardiogram, there is reversal of the normal E/A ratio. This pattern may develop normally with age in some patients, and many grade I patients will not have any clinical signs or symptoms of heart failure.
Ggrade II
Grade II diastolic dysfunction is called "pseudonormal filling dynamics". This is considered moderate diastolic dysfunction and is associated with elevated left atrial filling pressures. These patients more commonly have symptoms of heart failure, and many have left atrial enlargement due to the elevated pressures in the left heart.
Grade III
Grade III diastolic dysfunction is associated with "restrictive filling dynamics". This is a severe forms of diastolic dysfunction, and patients tend to have advanced heart failure symptoms.
Class III diastolic dysfunction patients will demonstrate reversal of their diastolic abnormalities on echocardiogram when they perform the Valsalva maneuver. This is referred to as "reversible restrictive diastolic dysfunction".
Grade IV
Grade III diastolic dysfunction is associated with "restrictive filling dynamics". This is a severe forms of diastolic dysfunction, and patients tend to have advanced heart failure symptoms.
Class IV diastolic dysfunction patients will not demonstrate reversibility of their echocardiogram abnormalities, and are therefore said to suffer from "fixed restrictive diastolic dysfunction".