Grade 1 Diastolic Dysfunction on Your Echo Report: What It Means in Simple Words

Medically Reviewed: 23 September 2026  •  Last Updated: 23 September 2026  •  8 minute read

Worried about this line on your echo report? Here is what it means, how serious it usually is, and what to do next.

You open your 2D echo report and one line stands out: Grade 1 LV diastolic dysfunction. The word dysfunction sounds alarming, and the report rarely explains it. Feeling worried is completely understandable.

Grade 1 is the least severe category of diastolic dysfunction. It becomes more common with age and often occurs along with conditions such as high blood pressure or diabetes.

What Does Grade 1 Diastolic Dysfunction Mean?

Filling vs Pumping, in Simple Words

Every heartbeat has two phases. In systole, the heart squeezes blood out. In diastole, it relaxes and refills. Think of a rubber ball: a soft one springs back at once, while an older, stiffer one takes a moment longer.

Grade 1 diastolic dysfunction, also called impaired relaxation, means the left ventricle relaxes more slowly than usual. The filling pressure inside the heart is usually still normal at rest.^{1, 2}

How It Appears on Your Echo Report

Your report may say Grade I LV diastolic dysfunction, Grade 1 LVDD (left ventricular diastolic dysfunction), or impaired LV relaxation. These terms describe the same finding. Your doctor looks at several echo measurements, such as the E/A ratio and e′ velocity, to assess how well the heart relaxes and fills.

Is Grade 1 Diastolic Dysfunction Dangerous?

On its own, grade 1 diastolic dysfunction is usually not an emergency, and many people feel perfectly well. Cleveland Clinic describes it as slightly impaired relaxation and a common finding in people over 60.³

It is still worth taking seriously. In a Mayo Clinic study from Minnesota, USA, heart failure developed over about six years in 7.8% of people whose readings stayed at, or moved to, the mild stage, compared with 2.6% of those whose relaxation stayed or became normal.⁴ So more than 9 in 10 people in the mild group did not develop heart failure in that time.

This older US study may not match Indian patients exactly, so treat it as a reason to act early, not to panic.

How Common Is It as You Get Older?

Very common. In a Mayo Clinic survey of 2,042 adults aged 45 or older, published in JAMA in 2003, about 1 in 5 had mild diastolic dysfunction on echo.⁵ Moderate and severe forms were far rarer.

Age alone does not explain every case of grade 1 diastolic dysfunction, so your doctor will also look for treatable causes.

What Causes Grade 1 Diastolic Dysfunction?

Often there is more than one reason. Cleveland Clinic lists these common causes and risk factors:³

• High Blood Pressure: Cleveland Clinic names uncontrolled blood pressure as the most common cause. Compare your readings with the normal blood pressure range for your age.
• Age: The risk rises with age, especially after 70.
• Diabetes and Excess Weight: Including a body mass index (BMI) of 30 or above.
• Heart Conditions: Coronary artery disease, a past heart attack or cardiomyopathy (heart muscle disease).
• Other Factors: Sleep apnoea, smoking and low physical activity.

Will You Feel Any Symptoms?

Most people with grade 1 diastolic dysfunction feel nothing unusual. Some notice breathlessness during effort, such as climbing stairs.

With more advanced diastolic dysfunction or heart failure, fluid can build up in the lungs and legs, causing breathlessness, tiredness and ankle swelling. Cleveland Clinic also notes a link with atrial fibrillation, an irregular heart rhythm.³

Grade 1 vs Grade 2 vs Grade 3: What Is the Difference?

Doctors combine several echo measurements to judge how well the heart relaxes and whether filling pressure has risen. Higher grades are more serious.^{1, 3}

Grade 2 or higher may need closer review with your doctor.

Can Grade 1 Get Worse or Better?

It can change in either direction. In a 2011 JAMA study, Mayo Clinic researchers rechecked 1,402 adults after about four years. These results cover the whole group, not only those who started at grade 1.⁴

Worsening was more likely at age 65 or older, and results varied between individuals.

What Tests Might Your Doctor Suggest Next?

A scan finding like grade 1 diastolic dysfunction is not a full diagnosis. To find out why it is there, your doctor may suggest:

• Blood Pressure Checks: At the clinic and at home.
• Blood Sugar Tests: Such as HbA1c (glycated haemoglobin), to look for diabetes.
• ECG (Electrocardiogram): To check your heart rhythm. See our guide to ECG normal range values.
• Sleep Study: If you snore loudly or feel sleepy by day.
• Repeat Echo: Later on, to check for change. See typical costs in our echo test price guide.

When Should You See a Cardiologist?

A family physician can often manage a grade 1 finding. Your doctor may refer you to a cardiologist, a heart specialist, if you have symptoms such as breathlessness or ankle swelling, an irregular heartbeat, or other findings on the same echo, for example a low EF, thickened heart walls or a valve problem. If unsure, ask whether a cardiologist review would help.

How Is Grade 1 Diastolic Dysfunction Treated?

Treatment for grade 1 diastolic dysfunction does not target the slow relaxation directly. It focuses on the conditions behind it, usually with medicines for high blood pressure or diabetes if needed, plus lifestyle changes. If fluid builds up, doctors may prescribe water tablets (diuretics).³

Whether tight control of these conditions slows the change itself is still being studied.⁶ Controlling them still benefits your overall health.

Not everyone with grade 1 diastolic dysfunction needs a heart medicine. The plan depends on your blood pressure, blood sugar, symptoms and the rest of your echo report. Always follow your doctor’s advice, and never start or stop a medicine on your own.

Daily Habits That Support Your Heart

Cleveland Clinic suggests these heart-healthy habits:³

• Stay Active: Regular walking or other moderate exercise can support heart health. If you have symptoms, ask your doctor what level of exercise is right for you.
• Limit Salt: Cut back on salty foods such as pickles, papad and packaged snacks.
• Avoid Tobacco: Avoid cigarettes, bidis and chewing tobacco.
• Maintain a Healthy Weight: If you are overweight, gradual weight loss can support overall heart health. Aim for regular, good quality sleep as well.

Is This the Same as a Low EF?

No. EF, or ejection fraction, measures how strongly the heart pumps. Diastolic dysfunction is about how well it relaxes and fills. So a report can show a normal EF, such as 60%, alongside grade 1 diastolic dysfunction. Our guide to EF 60% in a 2D echo report explains that number.

Frequently Asked Questions

References

1. Nagueh SF, et al. Recommendations for the Evaluation of Left Ventricular Diastolic Function by Echocardiography and for Heart Failure With Preserved Ejection Fraction Diagnosis: An Update From the American Society of Echocardiography. J Am Soc Echocardiogr. 2025. onlinejase.com
2. British Society of Echocardiography. The Assessment of Left Ventricular Diastolic Function: Guidance and Recommendations. Echo Res Pract. 2024. pmc.ncbi.nlm.nih.gov
3. Cleveland Clinic. Diastolic Dysfunction: Causes, Symptoms and Treatment. Last updated 2022. my.clevelandclinic.org
4. Kane GC, et al. Progression of Left Ventricular Diastolic Dysfunction and Risk of Heart Failure. JAMA. 2011. pubmed.ncbi.nlm.nih.gov
5. Redfield MM, et al. Burden of Systolic and Diastolic Ventricular Dysfunction in the Community. JAMA. 2003. pubmed.ncbi.nlm.nih.gov
6. American College of Cardiology. Journal Scan: Progression of Left Ventricular Diastolic Dysfunction and Risk of Heart Failure. 2011. acc.org