Diastolic Dysfunction

L.V Dysfunction

Diastolic Dysfunction Grades(Pulse Wave Doppler)

Diastolic Dysfunction Grades(Tissue Doppler)

If using septal E/e′ only:

• <8 → Normal
• 8–15 → Gray zone
• >15 → Elevated filling pressure

If using lateral E/e′ only:

• <8 → Normal
• 8–12 → Gray zone
• >12 → Elevated filling pressure

Limitations

E/e′ may be inaccurate in:

• Significant mitral regurgitation
• Mitral annular calcification
• Prosthetic mitral valve
• Hypertrophic cardiomyopathy
• Constrictive pericarditis
• Left bundle branch block or ventricular pacing
• Cardiac resynchronization therapy
• Regional wall-motion abnormalities (post-MI)
• Tachycardia with E–A fusion
• Atrial fibrillation (interpret cautiously)

Here the confusion comes

You have read that –Do not diagnose or grade diastolic dysfunction using E/e′ alone. According to the 2016 ASE/EACVI guidelines, E/e′ is one of four key parameters (along with e′ velocity, LAVI, and TR velocity) used to determine whether diastolic dysfunction is present and whether LV filling pressures are elevated. The grade (I, II, III) is assigned primarily using the mitral inflow pattern (E/A ratio and E velocity) together with these supportive parameters.

But The ASE/EACVI 2016 algorithm was developed for stable outpatients and ambulatory echocardiography, not for critically ill ICU patients. In the ICU, many variables in the algorithm become unreliable, so intensivists often use a simplified, physiology-based approach rather than strictly applying the guideline.

The main reasons are:

• Mechanical ventilation alters preload and afterload.
• PEEP changes transmitral flow and pulmonary venous flow.
• Vasopressors/inotropes affect relaxation and filling.
• Tachycardia and atrial fibrillation make E/A difficult to interpret.
• Positive-pressure ventilation changes TR velocity.
• Critically ill patients often have rapidly changing loading conditions.

Therefore, E/e′ assumes a much greater role in critical care echocardiography, although it is still interpreted in context.

Why This Matters in the ICU

Estimating LV filling pressure helps clinicians answer key bedside questions:

• Can I safely give more fluid? High filling pressures argue for caution, but dynamic tests are still needed to assess fluid responsiveness.(Diastolic function does not measure preload responsiveness. A patient with high LV filling pressure can still occasionally be fluid responsive, and a patient with low filling pressure may not be. Dynamic tests (PLR, stroke-volume variation, VTI change) remain the preferred methods for predicting fluid responsiveness.)

Example –A hypotensive patient with:IVC collapsible,Hyperdynamic LV,Low E/e’—may benefit from fluids.but

A hypotensive patient with B-lines,E/e’ 18Grade III diastolic dysfunction probably needs vasopressors/inotropes rather than more fluid.

• Is pulmonary edema due to heart failure or ARDS? Elevated LV filling pressures support cardiogenic edema; normal filling pressures make ARDS more likely (in the appropriate clinical context).
• Should I intensify diuresis? Persistently elevated filling pressures in a congested patient support further decongestion if clinically tolerated.
• Why is the patient hypoxemic? Determining whether elevated pulmonary venous pressure is contributing to lung edema guides therapy toward decongestion versus primarily respiratory management.