Acute Care Echo

The hyperdynamic left ventricle in shock

A hypotensive patient on the acute take, and a focused study where the left ventricle is contracting vigorously. What that does, and does not, tell you.

A hypotensive patient on the acute take. You put the probe on, and the left ventricle is squeezing vigorously. Does that settle anything?

Make your call before you reveal the answer.

A small, hyperdynamic left ventricle with a round septum. This is a pattern of low left ventricular filling, not evidence of a normal circulation.

On the parasternal short axis at mid-left-ventricular level the cavity is small with vigorous contraction, and the septum stays round through the cardiac cycle.

Hyperdynamic is a function label, not a haemodynamic diagnosis. Read contraction and cavity size together: in shock, a small hyperdynamic left ventricle points away from primary left ventricular pump failure and should make you ask why filling is low. The septum and the right ventricle are where you look next.

Pearls

Read contraction and cavity together. Normal size with normal contraction is the reference pattern. Poor inward motion and poor wall thickening throughout the circle indicate severe global impairment. A small hyperdynamic cavity asks a question rather than answering one.
Judge global function by the whole short-axis circle, inward motion and systolic wall thickening in every segment. One wall does not define global function.
A round septum supports low venous return. Septal flattening with right ventricular dilatation redirects you towards right-heart loading. Time the D-shape: systolic flattening supports pressure loading, diastolic flattening supports volume loading, and flattening in both phases suggests a combined pattern.

Pitfalls

A small left ventricle describes low filling. It does not establish the cause and it does not prove hypovolaemia.
Do not infer fluid responsiveness from the inferior vena cava. A small, fully collapsing inferior vena cava suggests low right-sided filling pressure, but it does not prove volume depletion, responsiveness or safety, and deep inspiratory effort can produce the same appearance. A plethoric inferior vena cava is equally non-specific, particularly with positive-pressure ventilation or raised right-sided pressure.
A thickened right ventricular free wall suggests chronic loading. It does not exclude an acute event on top.

A strong squeeze does not mean normal haemodynamics. In shock, a small hyperdynamic left ventricle points away from primary left ventricular pump failure, so read the cavity, septum and right ventricle to find why filling is low.

British Society of Echocardiography (BSE) Level 1 assessment is qualitative and global. This recognises a pattern; it does not grade severity, calculate ejection fraction, estimate pulmonary pressures, identify aetiology from morphology alone or predict fluid responsiveness. Image quality, respiratory effort and positive-pressure ventilation can alter interpretation. If the focused study and the patient do not fit, optimise, repeat and escalate.

This is one call from the Acute Echo Trainer. Module 04 works the small left ventricle in three steps: recognise the pattern, use the septum and the right ventricle to redirect the cause, then decide safely when the inferior vena cava is all you have been handed.

Get the Acute Echo Trainer Hands-on TTE programme

Dr Mansour

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This content is for educational purposes for healthcare professionals and does not replace supervised clinical training or local governance.