Cardiac Imaging

What Is the ACR-Recommended Follow-Up Imaging for an Adult with Known Heart Failure?

·
What Is the ACR-Recommended Follow-Up Imaging for an Adult with Known Heart Failure?

A 72-year-old woman with a known history of heart failure with reduced ejection fraction (HFrEF) presents for her annual cardiology follow-up. She has been stable on guideline-directed medical therapy (GDMT), but over the last few months, she reports a subtle increase in dyspnea when walking up a flight of stairs. Her weight is stable and she has no peripheral edema or other signs of acute decompensation. You need to reassess her cardiac function to determine if her condition has progressed and if her therapy requires adjustment. This raises a common clinical question: what is the most appropriate imaging study for routine or surveillance follow-up in a patient with established heart failure? According to the American College of Radiology (ACR) Appropriateness Criteria, a resting transthoracic echocardiogram is rated Usually Appropriate for this exact scenario.

Which Patients Fit This Follow-Up Heart Failure Scenario?

This clinical workflow is designed for adult patients with a previously established diagnosis of heart failure, whether it is HFrEF, heart failure with preserved ejection fraction (HFpEF), or heart failure with mildly reduced ejection fraction (HFmrEF). The key element is that the diagnosis is known, and the purpose of imaging is surveillance or reassessment due to a non-acute change in clinical status. This typically occurs in an outpatient setting to monitor disease progression, assess the response to therapy, or evaluate a new, mild symptom.

This guidance is not intended for:

  • Patients with suspected but undiagnosed heart failure. An adult presenting with new signs and symptoms concerning for heart failure requires an initial diagnostic workup. This falls under the ACR variant for initial imaging in suspected heart failure.
  • Patients with an acute decompensation. A patient presenting to the emergency department with acute worsening of symptoms, volume overload, or hemodynamic instability requires a more urgent and often broader evaluation that may differ from this routine follow-up pathway.
  • Patients with known heart failure but an unknown etiology. If the underlying cause of the heart failure has not yet been determined, the imaging strategy is focused on identifying the etiology (e.g., ischemic, infiltrative, valvular). This represents a separate clinical scenario with different imaging considerations.

This article specifically addresses the stable patient in a follow-up context, where the primary goal is to quantify changes from a known baseline.

What Are You Assessing with Follow-Up Imaging in Known Heart Failure?

In the follow-up setting for known heart failure, imaging is not about making a new diagnosis but about tracking the disease and its response to treatment. The key questions you are trying to answer guide the choice of modality. The differential considerations are focused on functional and structural changes over time.

Progressive Left Ventricular (LV) Dysfunction: This is the most common and critical assessment. You are evaluating for a decline in the left ventricular ejection fraction (LVEF), which has significant prognostic and therapeutic implications. A drop in LVEF might necessitate up-titration of GDMT or consideration for advanced therapies like an implantable cardioverter-defibrillator (ICD) or cardiac resynchronization therapy (CRT). Worsening diastolic function is also a key parameter, especially in HFpEF.

Adverse Cardiac Remodeling: Chronic heart failure leads to changes in the heart’s size, shape, and mass. Follow-up imaging quantifies this remodeling process. You are looking for an increase in LV volumes (end-diastolic and end-systolic volumes) or changes in wall thickness, which indicate disease progression despite medical therapy.

Worsening Valvular Disease: Many patients with heart failure have concurrent valvular issues. A common example is functional mitral regurgitation, which can worsen as the left ventricle dilates. Follow-up imaging is crucial for grading the severity of any known valvular stenosis or regurgitation, as a significant progression may itself become a target for intervention.

Right Ventricular (RV) Dysfunction: The status of the right ventricle is a powerful prognostic marker in heart failure. Progressive RV dilation or a decline in RV systolic function often signals advanced disease and the development of pulmonary hypertension. This finding can significantly alter patient management and prognosis.

Why Is Transthoracic Echocardiography the Recommended Study for Follow-Up?

For routine follow-up of an adult with known heart failure, the ACR designates US echocardiography transthoracic resting as Usually Appropriate. This recommendation is based on the modality’s ability to comprehensively answer the key clinical questions in a safe, accessible, and cost-effective manner.

A transthoracic echocardiogram (TTE) provides a wealth of information critical to managing chronic heart failure. It allows for precise, quantifiable assessment of LVEF, regional wall motion abnormalities, LV and RV size and function, diastolic parameters, and valvular structure and function. It can directly measure changes from prior studies, providing a clear picture of disease trajectory. Furthermore, TTE is widely available, can often be performed in the clinic, and involves no ionizing radiation (0 mSv).

Other imaging modalities are rated lower for this specific surveillance scenario for clear reasons:

  • Chest Radiography is rated May be appropriate. While useful for assessing cardiomegaly and the degree of pulmonary congestion (e.g., pleural effusions, Kerley B lines), it provides no direct information on cardiac function, chamber pressures, or valvular integrity. It is a complementary tool, not a primary modality for functional reassessment.
  • CTA coronary arteries with IV contrast is rated Usually not appropriate for this indication. This study is designed to evaluate for coronary artery stenosis. While ischemic heart disease is a common cause of heart failure, this test is not the correct tool for assessing the functional consequences of the disease over time. It exposes the patient to both iodinated contrast and significant radiation (ACR RRL ☢☢☢ 1-10 mSv) without answering the primary questions about ventricular function and remodeling.

In select cases where echocardiographic windows are poor or more precise quantification of volumes or tissue characterization is needed, MRI heart function and morphology (both with and without contrast) is also rated Usually Appropriate. Cardiac MRI is the gold standard for ventricular volumes and function but is more costly, less available, and has contraindications (e.g., certain implanted devices). It is typically reserved for situations where TTE is non-diagnostic or specific questions about myocardial viability or infiltration remain.

What’s Next After Transthoracic Echocardiography? Downstream Workflow

The results of the follow-up transthoracic echocardiogram directly guide the next steps in patient management. The downstream workflow depends on whether the findings show stability, improvement, or deterioration.

If the study shows stable or improved cardiac function: This is an encouraging result, suggesting the current medical regimen is effective. The next step is typically to continue the current GDMT, reinforce lifestyle modifications, and schedule the next routine follow-up. No further immediate imaging is usually required.

If the study shows worsening cardiac function: This finding necessitates a change in management.

  • Worsening LVEF: If the LVEF has declined, the priority is to optimize GDMT. This may involve up-titrating beta-blockers, ACE inhibitors/ARBs/ARNIs, and MRA, or adding an SGLT2 inhibitor if not already prescribed. If the LVEF drops to ≤35% despite optimal medical therapy, the patient should be evaluated for primary prevention ICD and potentially CRT if a QRS duration criterion is met.
  • Significant valvular deterioration: If a condition like mitral regurgitation has become severe, the patient may need referral for consideration of surgical or transcatheter valve intervention.
  • Worsening RV function: This is a poor prognostic sign and may prompt more aggressive management of volume status and consideration for advanced heart failure therapies, including referral for transplant or LVAD evaluation.

If the study is indeterminate or technically limited: Poor acoustic windows can sometimes limit the diagnostic quality of a TTE. If the key measurements (like LVEF) are equivocal and a management decision hinges on this information, the next step is to proceed to a modality with higher accuracy and reproducibility. In this case, ordering an MRI heart function and morphology without IV contrast, which is rated Usually Appropriate, is the logical next step to obtain definitive measurements of ventricular size and function.

Pitfalls to Avoid (and When to Get Help)

Navigating follow-up imaging in heart failure requires avoiding several common pitfalls to ensure optimal patient care.

  • Imaging too frequently without clinical change: Routine annual or biennial echocardiograms are reasonable, but repeating imaging every few months in a clinically stable patient is rarely indicated and provides little value.
  • Over-relying on LVEF alone: While LVEF is a critical metric, do not ignore other important findings like worsening diastolic function, increasing LV filling pressures, progressive RV dysfunction, or worsening tricuspid regurgitation.
  • Ignoring technically limited studies: If an echocardiogram report states that the study was technically difficult or key parameters could not be assessed, do not base major clinical decisions on it. Escalate to a higher-fidelity modality like cardiac MRI.
  • Using the wrong tool for the question: Do not order a nuclear stress test or a coronary CTA when the clinical question is about ventricular remodeling or valvular function. Match the test to the clinical question.

If a patient shows rapid clinical deterioration or develops refractory symptoms despite optimization of GDMT, it is time to escalate care. This typically involves a referral to an advanced heart failure specialist for evaluation for therapies such as mechanical circulatory support or cardiac transplantation.

Related ACR Topics and Tools

For a comprehensive overview of imaging across all clinical presentations of heart failure, from initial suspicion to advanced disease, please consult our parent topic hub article. Additional GigHz tools can help you navigate adjacent scenarios, understand imaging protocols, and discuss radiation safety with your patients.

Frequently Asked Questions

How often should a follow-up echocardiogram be performed in a stable heart failure patient?

There is no rigid schedule, but for a clinically stable patient on optimal medical therapy, reassessment every 1 to 2 years is often considered reasonable. More frequent imaging may be warranted if there is a change in clinical status, after a significant medication change, or to assess eligibility for a device like an ICD or CRT.

My patient’s echocardiogram was technically limited. What is the best next step?

If a transthoracic echocardiogram (TTE) provides non-diagnostic images due to poor acoustic windows, and the clinical question remains unanswered, the ACR rates Cardiac MRI as ‘Usually Appropriate’. Cardiac MRI is the gold standard for assessing ventricular volumes, mass, and ejection fraction and is not limited by body habitus.

Should I order a stress test for a follow-up heart failure evaluation?

A stress echocardiogram is also rated ‘Usually Appropriate’ by the ACR. It may be chosen over a resting study if there is a concurrent question about ischemia or dynamic changes in valvular function with exertion. However, for the primary purpose of assessing resting cardiac function and remodeling in a stable patient, a resting TTE is sufficient.

When is a chest X-ray useful in a follow-up visit for known heart failure?

A chest X-ray is rated ‘May be appropriate’. It is most useful when you suspect pulmonary congestion or a pleural effusion as a cause for worsening dyspnea. It can quickly assess for volume overload in the lungs but does not provide the functional cardiac data that an echocardiogram does. It’s a useful adjunct, but not a replacement for echocardiography.

Does this guidance apply to patients with heart failure with preserved ejection fraction (HFpEF)?

Yes. This guidance applies to all types of known heart failure. For patients with HFpEF, the follow-up echocardiogram is crucial for assessing diastolic function parameters, left atrial size, and estimating LV filling pressures, all of which are key to managing their condition.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 30, 2026