Indicators transmitral blood flow depends on many factors , and not only on tensile properties and LV relaxation . Therefore , when assessing diastolic function of the left ventricle to rely only on E / A ratio is incorrect .
On The transmitral bloodstream is affected by the following factors :
. load capacity ( preload and afterload );
. frequency of heart contractions ;
. systolic function of the LP ;
. respiratory phase .
Overload volume due to mitral or Aortic insufficiency reduces peak A , so as atrial contraction not at able to effectively push blood at already maximally stretched the desire of daughters . With tachycardia peak amplitude BUT increases at connections with shortening of diastole ( greater contribution of atrial systole ). On the contrary , if bradycardia peakBUT Decrease the creases due to the elongation phase of diastolic filling ( smaller contribution contraction of the atria ). So manner , high peak BUT It has a greater value onbackground bradycardia .
Ratio E / A incorrectly when atrial Arita mission , complete transverse blockade and lengthening the PR interval . Have elderly patients dominated by peak A. Ratios e E / A > 1 or E = A at combined with the shortening of time for slowing reflects the increase in course – diastolic pressure at LV . This type of diastolic dysfunction was the name pseudonormal .