Pulmonary hypertension (PH) puts a heavy load on the right ventricle. Over time, that chamber struggles to keep up. The heart muscle thickens, the chamber dilates, and eventually it fails. Catching these changes early with echocardiography is one of the most important skills a clinician can have. In 2026, the tools are better than ever, but the core principles remain the same. You need to know what to look for and how to interpret what you see.

Why the Right Ventricle Matters So Much in PH

The left side of the heart works against low resistance. The right side does not. In pulmonary hypertension, the pulmonary vascular resistance climbs. The right ventricle has to push blood through stiff, narrow vessels. It adapts at first by thickening its walls. This is called hypertrophy. Eventually, the muscle tires. The chamber stretches and loses its squeeze.

This progression from adaptive hypertrophy to maladaptive dilation is the key story. Echocardiography tells that story better than any other bedside tool. You can see the wall thickness. You can measure the chamber size. You can watch the muscle move. In 2026, we also have automated software that tracks speckles in the muscle to give us strain values. But the story starts with the basics.

Step by Step: How to Assess Right Ventricular Function

Here is a practical sequence to follow during every echo study for a patient with known or suspected PH.

1. Start with the parasternal long axis view. Look at the right ventricular outflow tract. Measure the proximal diameter. Anything above 35 mm raises a flag. Then check the right atrial size from the apical four chamber view. A dilated right atrium suggests elevated filling pressures.

2. Move to the apical four chamber view. This is your workhorse window. Measure the right ventricular basal diameter. Normal is less than 42 mm. Then look at the shape of the septum. A D shaped left ventricle in systole means the right ventricle is under pressure overload.

3. Assess systolic function with TAPSE. Place the M mode cursor at the lateral tricuspid annulus. Measure the distance the annulus moves from end diastole to end systole. A TAPSE below 17 mm indicates reduced systolic function. This measurement is simple, reproducible, and strongly linked to outcomes.

4. Get the S’ wave by pulsed wave Doppler. Place the sample volume at the lateral tricuspid annulus. The S’ wave velocity should be above 9.5 cm/s. Slower than that means the longitudinal fibers are not contracting well.

5. Measure the fractional area change (FAC). Trace the right ventricular endocardial border in systole and diastole from the apical four chamber view. FAC = (end diastolic area minus end systolic area) divided by end diastolic area. Normal is above 35 percent. This accounts for both longitudinal and radial contraction.

6. Apply speckle tracking for right ventricular free wall strain. In 2026, most machines have automated strain software. The normal value for right ventricular free wall strain is around negative 20 percent. Less negative values (like negative 15 or negative 12) signal early dysfunction before TAPSE drops.

Key Measurements at a Glance

Parameter	Normal Value	Warning Sign in PH	What It Tells You
TAPSE	> 17 mm	< 17 mm	Longitudinal systolic function
S’ wave	> 9.5 cm/s	< 9.5 cm/s	Longitudinal fiber velocity
FAC	> 35%	< 35%	Global systolic function
RV basal diameter	< 42 mm	> 42 mm	Chamber dilation
Free wall strain	-20%	Less negative than -18%	Early systolic impairment
RA pressure (by IVC)	< 8 mmHg	> 15 mmHg	Filling pressures

Common Mistakes That Skew Your Results

Even experienced sonographers make errors. Here are the ones to watch for.

• Using the wrong view for TAPSE. The M mode cursor must be aligned parallel to the motion of the annulus. If you are off axis, the measurement is falsely low.
• Forgetting to adjust gain. When tracing the endocardium for FAC, too much gain makes the cavity look smaller. Too little gain makes it look larger. Keep the gain low and adjust until the blood tissue interface is clear.
• Ignoring the septum. The septum belongs to both ventricles. In PH, the septum flattens and moves leftward. This reduces left ventricular filling and can cause low cardiac output even if the right ventricle looks okay.
• Relying on a single measurement. TAPSE can be normal even when the right ventricle is failing if the radial function is preserved. Always combine TAPSE with FAC and strain.

“A single echo parameter is never enough. You need to build a picture from multiple views and measurements. The right ventricle is geometrically complex, and each measurement captures a different aspect of its function.” Dr. Maria Chen, Director of Echocardiography at Johns Hopkins Pulmonary Hypertension Program.

What Changes in 2026

Echocardiography has not changed radically from 2025. But three trends are worth noting.

First, automated strain analysis is now standard on nearly all mid range and high end ultrasound systems. You do not need to manually trace the endocardium for strain anymore. The software tracks the speckles in real time. This reduces inter observer variability.

Second, three dimensional echocardiography is more practical. The matrix array transducers are smaller and faster. You can acquire a full volume of the right ventricle in a single beat. This allows direct measurement of right ventricular ejection fraction without geometric assumptions. Normal 3D RVEF is above 45 percent.

Third, artificial intelligence tools are helping with image acquisition. Some systems now guide the sonographer to the correct window and suggest optimal gain settings. This is especially helpful for less experienced operators.

Putting It All Together in Clinical Practice

When you sit down to interpret an echo in a patient with PH, ask yourself three questions.

1. Is the right ventricle dilated?
2. Is the right ventricle contracting normally?
3. Are the filling pressures elevated?

If the answer to any of these is yes, the patient is at higher risk. You need to correlate these findings with the patient’s functional class, six minute walk distance, and biomarkers like NT proBNP. The echo is not a standalone test. It is part of a larger picture.

For patients with systemic sclerosis or other connective tissue diseases, the risk of PH is especially high. You can learn more about the latest treatment options in our article on emerging therapies in pulmonary fibrosis. And if you are managing critically ill patients on ventilators, check out our guide on optimizing mechanical ventilation strategies for critical care patients.

A Practical Way to Track Changes Over Time

Serial echocardiography is the standard of care for PH patients. You need to compare studies side by side. Here is a simple checklist to use during follow up.

• Compare TAPSE values. A drop of more than 3 mm is clinically significant.
• Compare right atrial area. An increase of more than 5 cm squared suggests worsening right heart failure.
• Look at the pericardial effusion. New or increasing effusion is a bad sign.
• Check the septal shape. A more D shaped left ventricle means the right ventricular pressure is rising.

These changes often happen before symptoms worsen. Catching them early gives you a chance to adjust therapy.

The Bottom Line for Clinicians

You do not need to be a cardiologist to assess right ventricular function in pulmonary hypertension. You need a systematic approach and a willingness to look at multiple parameters. Start with TAPSE and S’. Add FAC and strain when you can. Use the IVC to estimate right atrial pressure. And always compare with prior studies.

In 2026, the technology helps. But the clinical judgment is still yours. The right ventricle tells a story. Learn to read it.