Constrictive Pericarditis: When Heart Failure Is Not the Heart — CT, Echocardiography, MRI, and AI-Assisted Diagnosis
A Case Where the Heart Appears to Fail, but the Myocardium Is Not the Problem
Heart failure is usually approached as a problem of the heart muscle.
Reduced contractility, myocardial ischemia, cardiomyopathy, valvular
disease, rhythm disturbance, and other cardiac disorders are common
explanations for progressive dyspnea, peripheral edema, elevated jugular venous
pressure, and exercise intolerance.
But there is another possibility.
The myocardium may be relatively preserved while the heart is mechanically
trapped by an abnormal pericardium.
This is the central diagnostic challenge of constrictive pericarditis.
In this condition, chronic inflammation and fibrosis can transform the
pericardium into a rigid structure that restricts normal diastolic filling. The
resulting physiology can resemble congestive heart failure even though the
fundamental problem is not primary myocardial failure.
This distinction matters because constrictive pericarditis can be
potentially treatable, and the diagnostic pathway is fundamentally different
from routine management of myocardial heart failure.
The case considered here illustrates an important principle in modern
medical imaging:
When the clinical syndrome says “heart failure,” imaging must still ask
whether the heart muscle is actually failing.
The Clinical Presentation: Heart Failure Without an
Obvious Myocardial Explanation
A man in his late 60s presented with progressive cardiopulmonary symptoms
characterized by:
- Progressive dyspnea
- Severe lower-extremity edema
- Jugular venous distention
- Kussmaul sign
- Persistent symptoms
despite repeated heart failure treatment
These findings strongly suggest elevated systemic venous pressure and
impaired cardiac filling.
The difficulty is that the clinical phenotype does not immediately
identify the mechanism.
The patient can appear to have conventional congestive heart failure while
the underlying physiology is actually constrictive pericardial disease.
This is one of the reasons constrictive pericarditis may remain diagnostically
challenging.
The differential diagnosis may include:
- Heart failure with
preserved ejection fraction
- Restrictive
cardiomyopathy
- Severe tricuspid
regurgitation
- Right ventricular
dysfunction
- Pulmonary hypertension
- Hepatic disease with
volume overload
- Chronic pericardial
disease
- Constrictive pericarditis
The critical question is therefore not simply:
“Does this patient have heart failure?”
The more important question is:
“Why is the heart failing to fill normally?”
That change in diagnostic thinking is where medical imaging becomes
decisive.
What Is Constrictive Pericarditis?
The pericardium is normally a thin, compliant structure surrounding the
heart.
In constrictive pericarditis, chronic inflammation may lead to:
- Pericardial fibrosis
- Pericardial thickening
- Adhesion between
pericardial layers
- Calcification
- Loss of normal pericardial
compliance
- Restriction of
ventricular filling
The result is a mechanical limitation on cardiac expansion during
diastole.
The myocardium may initially maintain relatively preserved systolic
function, but the ventricles cannot expand normally because the surrounding
pericardial envelope has become rigid.
This creates an important physiological phenomenon:
ventricular interdependence.
Because the total volume available inside the rigid pericardial
compartment is constrained, increased filling of one ventricle can occur at the
expense of filling of the other.
This interaction becomes particularly important during respiration.
Consequently, constrictive pericarditis is not simply a disease that can
be diagnosed by looking for a thickened pericardium.
It is a disease of pericardial anatomy plus cardiac physiology.
Chest X-Ray: The First Clue May Be Calcification
Chest radiography remains relevant even in an era dominated by CT and MRI.
In the appropriate clinical context, extensive pericardial calcification
can be an important clue to chronic pericardial disease.
The radiographic finding itself, however, should not be interpreted in
isolation.
Pericardial calcification supports the possibility of chronic constrictive
disease, but the absence of calcification does not exclude constriction.
This is a critical point for radiology interpretation.
A normal or non-calcified pericardium on chest radiography should not
prematurely terminate the diagnostic process when the clinical and
physiological findings remain suspicious.
The role of the chest radiograph is therefore best understood as:
a clue-generating examination rather than a definitive test.
CT: The Anatomical Map of the Pericardium
Computed tomography provides a major advantage because it depicts the
pericardium with high spatial resolution.
In the present case, CT demonstrated:
- Pericardial thickening of
approximately 6 mm
- Extensive pericardial
calcification
- Pleural effusion
These findings substantially strengthen the suspicion for chronic
constrictive pericardial disease.
CT can answer several important anatomical questions:
1. Is the pericardium thickened?
Pericardial thickening supports chronic pericardial disease, although
thickness alone does not prove physiological constriction.
2. Is there pericardial calcification?
Calcification can indicate chronicity and is particularly useful when it
is extensive.
3. Is the abnormality diffuse or focal?
Localized constriction may be overlooked if the radiologist evaluates only
a limited portion of the pericardium.
4. Is there associated pleural or pulmonary disease?
Pleural effusion and other thoracic findings may provide additional
evidence of chronic hemodynamic consequences.
5. Is there an alternative explanation?
CT can simultaneously evaluate the lungs, mediastinum, great vessels, and
other thoracic structures.
This makes cardiac CT particularly valuable when the clinical question
involves both anatomy and differential diagnosis.
However, one important principle must be emphasized:
A thick pericardium is not synonymous with constrictive physiology.
Conversely, constriction can occasionally occur without dramatic
pericardial thickening.
Therefore, CT should be integrated with echocardiographic and clinical
findings rather than interpreted as a stand-alone diagnostic endpoint.
Echocardiography: Seeing the Physiology
If CT shows the structural envelope, echocardiography helps reveal what
that envelope is doing to the heart.
This distinction is fundamental.
Constrictive pericarditis is a physiological disorder, and
echocardiography can directly evaluate the consequences of the abnormal
pericardium on ventricular filling.
Important echocardiographic findings include:
- Respiration-related
ventricular septal shift
- Ventricular
interdependence
- Abnormal mitral inflow
respiratory variation
- Preserved or increased
medial mitral annular e′ velocity
- Hepatic vein expiratory
diastolic flow reversal
The septal bounce described in this case is therefore more than a
visually interesting sign.
It reflects abnormal ventricular interaction produced by the constraining
pericardium.
The Mayo Clinic echocardiographic criteria emphasize the importance of
respiration-related septal shift, medial mitral annular e′ velocity, and
hepatic vein expiratory diastolic flow reversal in distinguishing constrictive
pericarditis from restrictive myocardial disease and other mimics.
This is why echocardiography should not be reduced to a simple measurement
of ejection fraction.
A patient can have a relatively preserved ejection fraction and still have
severe cardiac dysfunction caused by abnormal diastolic mechanics.
Cardiac MRI: Anatomy, Physiology, and Tissue
Characterization
Cardiac MRI provides another layer of diagnostic information.
The value of cardiac MRI in constrictive pericarditis lies not merely in
measuring pericardial thickness.
It can provide:
- High-resolution
pericardial anatomy
- Assessment of ventricular
motion
- Evaluation of ventricular
interdependence
- Tissue characterization
- Detection of pericardial
inflammation
- Assessment of myocardial
involvement
- Better differentiation of
active inflammation from chronic fibrotic disease
This becomes particularly important when clinicians need to determine
whether constriction is associated with active inflammation.
The distinction has therapeutic implications.
A patient with potentially reversible inflammatory constriction may have a
different management pathway from a patient with established chronic fibrotic
constriction.
MRI therefore becomes more than another imaging examination.
It can help answer a clinically meaningful question:
Is the abnormal pericardium merely thickened, or is there active
inflammatory disease that may still be biologically modifiable?
Modern guidelines emphasize multimodality imaging for suspected
constrictive pericarditis, with CT and cardiovascular MRI providing
complementary structural and tissue information.
Why CT and MRI Should Not Be Viewed as Competing Tests
One common mistake is to ask:
“Should we perform CT or MRI?”
The better question is:
“What clinical question does each modality answer?”
Table 1. Multimodality Imaging Roles in Constrictive Pericarditis
| Modality | Key Finding | Diagnostic Role |
|---|---|---|
| Chest X-ray | Pericardial calcification | Initial clue |
| CT | Pericardial thickening/calcification | Anatomical assessment |
| Echocardiography | Septal bounce, ventricular interdependence | Physiological assessment |
| Cardiac MRI | Inflammation, fibrosis, ventricular interaction | Tissue characterization |
This complementary strategy is the foundation of modern cardiac imaging.
The modalities are not redundant.
They interrogate different dimensions of the disease.
X-ray sees the clue.
CT defines the structure.
Echocardiography demonstrates the physiology.
MRI adds tissue characterization and functional context.
That is the essence of multimodality imaging.
The Most Important Differential Diagnosis:
Constriction vs Restriction
One of the most important diagnostic challenges is differentiating
constrictive pericarditis from restrictive cardiomyopathy.
Both conditions can produce:
- Elevated venous pressure
- Peripheral edema
- Dyspnea
- Diastolic dysfunction
- Exercise intolerance
- Preserved or relatively
preserved systolic function
But their anatomical origins are different.
Table 2. Constrictive Pericarditis vs. Restrictive Cardiomyopathy
| Feature | Constrictive Pericarditis | Restrictive Cardiomyopathy |
|---|---|---|
| Primary site | Pericardium | Myocardium |
| Pericardial thickening | May be present | Usually absent |
| Calcification | May be prominent | Not typical |
| Ventricular interdependence | Prominent | Less characteristic |
| Septal bounce | Common | Not typical |
| MRI role | Pericardial/tissue assessment | Myocardial characterization |
Constrictive Pericarditis
The primary abnormality is the pericardium.
The rigid pericardial envelope limits cardiac expansion.
Restrictive Cardiomyopathy
The primary abnormality is the myocardium.
Myocardial infiltration, fibrosis, or other structural abnormalities
impair ventricular relaxation and filling.
This distinction has major therapeutic implications.
A patient with constrictive pericarditis may be evaluated for
pericardiectomy when permanent constriction is established and clinically
significant.
A patient with restrictive cardiomyopathy requires an entirely different
diagnostic and therapeutic strategy.
Therefore:
The distinction between constriction and restriction is not academic. It
can change the entire clinical pathway.
Where Artificial Intelligence Can Help
Artificial intelligence is increasingly being integrated into medical
imaging workflows.
However, the most clinically responsible way to discuss AI in constrictive
pericarditis is not to claim that an algorithm independently diagnoses the
disease.
The more realistic model is AI-assisted multimodality decision support.
Potential applications include:
Table 3. Potential Roles of AI in Constrictive Pericarditis Imaging
| AI Function | Potential Application | Human Role |
|---|---|---|
| Detection | Pericardial calcification/thickening | Radiologist verification |
| Quantification | Pericardial and cardiac measurements | Clinical interpretation |
| Workflow | Prioritization and triage | Final responsibility |
| Decision Support | Multimodality pattern integration | Multidisciplinary decision |
Automated Pericardial Abnormality Detection
Computer vision algorithms could identify:
- Pericardial calcification
- Pericardial thickening
- Pericardial effusion
- Abnormal cardiac contours
on CT examinations.
Quantitative Imaging
AI may assist in measuring:
- Pericardial thickness
- Calcification burden
- Cardiac chamber
dimensions
- Ventricular volumes
- Temporal changes between
examinations
Quantitative analysis may improve reproducibility compared with purely
qualitative assessment.
Echocardiographic Analysis
AI-assisted echocardiography may help quantify:
- Septal motion
- Respiratory variation
- Doppler parameters
- Myocardial velocities
- Chamber volumes
The challenge is that constrictive physiology is highly dependent on
acquisition quality and clinical context.
An algorithm that detects an abnormal septal movement is not automatically
proving constrictive pericarditis.
Multimodal Clinical Decision Support
The most interesting future application may be integration.
An AI platform could potentially combine:
CT + echocardiography + cardiac MRI + clinical history + laboratory data +
prior imaging
to generate a structured diagnostic alert.
For example:
Pattern Suggestive of Constrictive Pericardial Disease
Possible supporting features:
- Pericardial calcification
- Pericardial thickening
- Septal bounce
- Ventricular
interdependence
- Abnormal respiratory
Doppler findings
- MRI evidence of
pericardial inflammation or fibrosis
The final interpretation, however, should remain with the appropriately
trained clinical team.
AI Should Support Radiologists, Not Replace Them
This case also demonstrates an important principle in clinical AI.
A medical AI system may recognize patterns, but the radiologist must
determine whether those patterns make clinical sense.
For example, pericardial thickening can occur in conditions that do not
necessarily produce constrictive physiology.
Similarly, calcification does not by itself establish the diagnosis.
AI may identify the abnormality.
The radiologist must determine its significance.
The cardiologist must integrate the hemodynamics.
The cardiac surgeon must determine procedural feasibility.
The clinical team must determine the final management strategy.
This is why the future of medical imaging is unlikely to be:
AI versus physician.
It is much more likely to be:
AI + radiologist + cardiologist + surgeon + clinical data.
The Hidden Cost of Diagnostic Delay
The economic dimension of constrictive pericarditis is important, but it
should be approached carefully.
Healthcare costs vary substantially according to country, insurance
system, hospital, inpatient versus outpatient status, procedure complexity, and
local reimbursement.
Therefore, a single universal dollar value for “the cost of constrictive
pericarditis” is misleading.
The more useful concept is diagnostic pathway cost.
When the underlying diagnosis is missed, patients may experience:
- Repeated emergency visits
- Recurrent hospitalization
- Repeated imaging
- Long-term medication
without correction of the underlying mechanism
- Delayed specialist
referral
- Delayed surgical
evaluation
- Progressive functional
deterioration
The financial burden is therefore not simply the price of one MRI
examination.
It is the cumulative cost of an inefficient diagnostic pathway.
This leads to a broader healthcare principle:
The cheapest diagnostic test is not always the lowest-cost clinical
strategy.
A relatively expensive imaging examination may reduce downstream costs if
it changes the diagnosis and prevents months of ineffective treatment.
Conversely, inexpensive testing performed repeatedly without resolving the
underlying diagnostic question may become expensive over time.
Choosing the Right Hospital Can Become Part of the
Diagnosis
Constrictive pericarditis is also an example of why healthcare quality
cannot be evaluated solely by individual technologies.
A hospital may have CT.
Another may have cardiac MRI.
Another may have advanced echocardiography.
But the important question is whether the institution can connect these
capabilities into an effective clinical pathway.
For complex constrictive pericarditis, important institutional
capabilities may include:
- Advanced echocardiography
- Cardiac CT
- Cardiac MRI
- Experienced
cardiovascular radiologists
- Cardiologists familiar
with pericardial disease
- Cardiac surgery
- Multidisciplinary case
conferences
- Appropriate hemodynamic
assessment
- Postoperative management
capabilities
In other words:
Having the technology is not the same as having the diagnostic system.
A hospital can own an MRI scanner and still lack an effective pathway for
recognizing constrictive physiology.
The value of technology emerges only when it is connected to clinical
expertise and workflow.
The Modern Diagnostic Workflow
A practical multimodality pathway can be conceptualized as follows:
Step 1 — Recognize the Clinical Pattern
Consider constrictive pericarditis when there is unexplained systemic
venous congestion, edema, dyspnea, elevated jugular venous pressure, or
Kussmaul sign.
Step 2 — Perform Echocardiography
Evaluate ventricular interaction, septal motion, respiratory variation,
tissue Doppler findings, and hepatic venous flow.
Step 3 — Perform CT When Anatomical Definition Is
Required
Assess pericardial thickening, calcification, distribution, associated
effusion, and other thoracic abnormalities.
Step 4 — Use Cardiac MRI When Tissue Characterization or
Functional Clarification Is Needed
Evaluate inflammation, fibrosis, myocardial involvement, ventricular
interaction, and other relevant findings.
Step 5 — Resolve Discordant Findings
If clinical findings and noninvasive imaging remain discordant or
inconclusive, invasive hemodynamic assessment may become appropriate.
Step 6 — Determine Reversibility and Treatment Pathway
Active inflammatory constriction and established permanent constriction
should not automatically be treated as the same biological condition.
Step 7 — Refer to an Experienced Multidisciplinary Center
When surgery or advanced cardiac management is being considered,
institutional experience becomes clinically relevant.
What the Radiologist Should Look For
For practical radiology interpretation, a structured approach is useful.
When reviewing CT in a patient with suspected constrictive pericarditis,
ask:
Pericardium
- Is the pericardium
thickened?
- Is the thickening diffuse
or focal?
- Is there calcification?
- Is the calcification
extensive?
- Is there enhancement suggesting
inflammatory activity?
- Is there an associated
pericardial effusion?
Heart
- Is there abnormal
ventricular morphology?
- Is there evidence of
right-sided pressure elevation?
- Is there abnormal chamber
interaction?
Pleura and Lungs
- Is there pleural
effusion?
- Is there pulmonary edema?
- Are there alternative
pulmonary causes of dyspnea?
Clinical Correlation
- Does echocardiography
demonstrate constrictive physiology?
- Is there evidence of
restrictive cardiomyopathy?
- Does MRI suggest active
inflammation?
- Is there a history of
previous pericardial disease, surgery, radiation, infection, or other
relevant causes?
This systematic approach prevents the interpretation from becoming overly
dependent on a single imaging sign.
Clinical Pearls
Pearl 1
Not every patient with heart failure symptoms has primary myocardial
failure.
Pearl 2
Pericardial calcification is an important clue but does not establish
constrictive physiology by itself.
Pearl 3
Pericardial thickening supports the diagnosis but is not sufficient on its
own.
Pearl 4
Echocardiography is essential because constrictive pericarditis is
fundamentally a physiological disorder.
Pearl 5
Cardiac MRI can provide important information about tissue
characteristics, inflammation, and ventricular interaction.
Pearl 6
Constrictive pericarditis and restrictive cardiomyopathy can look
clinically similar but require fundamentally different diagnostic strategies.
Pearl 7
AI should be used to augment detection, quantification, workflow, and
decision support—not to replace expert clinical interpretation.
Pearl 8
The value of advanced imaging is determined by whether it changes the
diagnostic pathway.
The Larger Lesson: Imaging Is Not Just About Finding
Abnormalities
The most important lesson from this case extends beyond constrictive
pericarditis.
Modern medical imaging is moving from a model of:
“Find the abnormality.”
toward:
“Explain the physiology, quantify the disease, integrate the evidence, and
change the decision.”
That evolution is particularly important in cardiovascular imaging.
CT provides anatomy.
Echocardiography provides dynamic physiology.
MRI provides tissue characterization and functional information.
Artificial intelligence can potentially connect these sources of
information.
But the final value comes from clinical reasoning.
A sophisticated algorithm cannot compensate for an incorrectly framed
clinical question.
Likewise, a high-end MRI scanner cannot help if the patient is never
referred for appropriate imaging.
The real innovation is therefore not simply the acquisition of more
images.
It is the construction of a diagnostic ecosystem in which imaging,
AI, clinical expertise, and healthcare workflow work together.
Conclusion: The Heart May Not Be Failing — It May Be
Trapped
Constrictive pericarditis is an important reminder that the appearance of
heart failure does not always mean that the myocardium is the primary problem.
A patient may have:
- Severe edema
- Elevated jugular venous
pressure
- Dyspnea
- Kussmaul sign
- Recurrent congestion
while the central pathology lies outside the myocardium.
In such cases, multimodality imaging becomes decisive.
Chest X-ray may reveal the first clue.
CT defines the pericardial anatomy.
Echocardiography demonstrates constrictive physiology.
Cardiac MRI provides tissue and functional characterization.
AI can potentially accelerate detection, quantification, and workflow
integration.
But none of these technologies should be interpreted in isolation.
The diagnosis emerges from the combination of anatomy, physiology, tissue
characterization, clinical context, and expert judgment.
That is the real lesson of constrictive pericarditis.
The heart may appear to be failing.
But sometimes the myocardium is not the problem.
The heart is simply trapped.
Key Takeaways for Medical Imaging and Clinical AI
- Constrictive pericarditis
can mimic conventional heart failure.
- Preserved myocardial
function does not exclude severe cardiac dysfunction.
- Pericardial calcification
and thickening are important CT findings.
- Echocardiography is
critical for demonstrating constrictive physiology.
- Cardiac MRI adds tissue
characterization and functional information.
- CT, echocardiography, and
MRI should be viewed as complementary rather than competing modalities.
- Restrictive
cardiomyopathy remains an important differential diagnosis.
- Multimodality imaging is
central to contemporary evaluation of suspected constrictive pericarditis.
- AI may support detection,
quantification, prioritization, and clinical decision support.
- AI should augment—not
replace—radiologists, cardiologists, and multidisciplinary clinical
judgment.
- Diagnostic delay can
create substantial clinical and healthcare-system costs.
- Advanced imaging is
valuable when it changes the diagnostic and treatment pathway.
References
[1] J. Schulz-Menger et al., “2025 ESC Guidelines for the management of
myocarditis and pericarditis,” European Heart Journal, vol. 46, no. 40,
pp. 3952–4041, 2025, doi: 10.1093/eurheartj/ehaf192.
[2] B. Cosyns et al., “European Association of Cardiovascular Imaging
(EACVI) position paper: Multimodality imaging in pericardial disease,” European
Heart Journal–Cardiovascular Imaging, vol. 16, no. 1, pp. 12–31, 2015, doi:
10.1093/ehjci/jeu128.
[3] T. D. Welch et al., “Echocardiographic diagnosis of constrictive
pericarditis: Mayo Clinic criteria,” Circulation: Cardiovascular Imaging,
vol. 7, no. 3, pp. 526–534, 2014, doi: 10.1161/CIRCIMAGING.113.001613.
[4] N. S. Anavekar et al., “Index of biventricular interdependence
calculated using cardiac MRI: A proof of concept study in patients with and
without constrictive pericarditis,” International Journal of Cardiovascular
Imaging, vol. 29, no. 2, pp. 363–369, 2013, doi: 10.1007/s10554-012-0101-x.
[5] R. R. Brandt and J. K. Oh, “Constrictive pericarditis: Role of
echocardiography and magnetic resonance imaging,” European Society of
Cardiology e-Journal of Cardiology Practice, 2018.
[6] M. J. Pennell et al., “ACCF/ACR/AHA/NASCI/SCMR 2010 expert consensus
document on cardiovascular magnetic resonance,” Circulation, vol. 121,
2010, including the section on pericardial disease and constrictive
pericarditis.
[7] European Society of Cardiology, “2025 ESC Guidelines for the
management of myocarditis and pericarditis,” ESC Clinical Practice
Guidelines, 2025.
Medical Imaging Insight
The most dangerous diagnostic error in constrictive pericarditis is not
failure to recognize a rare disease.
It is assuming that every patient who looks like heart failure has
myocardial failure.
When the clinical syndrome and myocardial function do not fit together,
look beyond the myocardium.
That is where multimodality imaging can change the diagnosis—and
potentially change the patient's entire treatment pathway.
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