Cardiomegaly: Progressive Cardiac Enlargement Associated with Hypertensive Heart Disease – A Case Report

Abstract

Cardiomegaly refers to abnormal enlargement of the heart and is often an indicator of underlying cardiovascular pathology rather than a disease itself. It commonly results from chronic hypertension, valvular heart disease, cardiomyopathy, ischemic heart disease, or congenital cardiac abnormalities. Progressive cardiac enlargement may eventually lead to heart failure, arrhythmias, thromboembolic complications, and increased mortality if left untreated.

We present the case of a 58-year-old male who presented with progressive exertional dyspnea, lower extremity edema, and fatigue. Chest radiography demonstrated an enlarged cardiac silhouette, while echocardiography revealed left ventricular hypertrophy and dilatation with reduced systolic function. Further evaluation established hypertensive heart disease as the primary etiology. The patient was managed with antihypertensive therapy, diuretics, and lifestyle modification, resulting in symptomatic improvement and stabilization of cardiac function.

This case highlights the importance of early recognition of cardiomegaly, comprehensive cardiovascular evaluation, and timely intervention to prevent progression to advanced heart failure.

Introduction

Cardiomegaly is defined as enlargement of the heart beyond normal anatomical dimensions. It may involve enlargement of one or more cardiac chambers and frequently reflects chronic structural or functional cardiac stress.

The condition is commonly identified through chest radiography, where an increased cardiothoracic ratio suggests cardiac enlargement. However, echocardiography remains the gold standard for evaluating chamber size, ventricular function, and associated structural abnormalities.

Common causes of cardiomegaly include:

• Chronic hypertension

• Coronary artery disease

• Dilated cardiomyopathy

• Valvular heart disease

• Congenital heart disorders

• Arrhythmias

• Pulmonary hypertension

Clinical manifestations vary depending on the severity and underlying cause but commonly include dyspnea, fatigue, exercise intolerance, edema, and palpitations.

Early diagnosis and management are essential to prevent irreversible myocardial damage and cardiovascular complications.

Case Report

Patient History

A 58-year-old male presented to the cardiology outpatient department with complaints of:

• Progressive shortness of breath for eight months

• Fatigue during routine activities

• Swelling of both ankles for three months

• Occasional palpitations

• Reduced exercise tolerance

The symptoms had gradually worsened over the preceding six months.

The patient denied chest pain, syncope, fever, or recent respiratory infections.

Past medical history revealed:

• Hypertension for 15 years

• Type 2 diabetes mellitus for 8 years

• Dyslipidemia

Medication adherence was irregular, and blood pressure control had been suboptimal for several years.

Family history was significant for hypertension and ischemic heart disease.

Clinical Examination

General Examination

The patient appeared mildly dyspneic at rest.

Vital signs were as follows:

• Blood pressure: 168/96 mmHg

• Pulse rate: 92 beats/minute

• Respiratory rate: 22 breaths/minute

• Temperature: Afebrile

• Oxygen saturation: 96% on room air

Physical examination revealed:

• Bilateral pitting pedal edema

• Elevated jugular venous pressure

• Mild peripheral cyanosis

Cardiovascular Examination

Cardiac examination demonstrated:

• Laterally displaced apical impulse

• Presence of S3 gallop rhythm

• Mild systolic murmur at the apex

• Regular heart rhythm

Respiratory Examination

Findings included:

• Bibasal fine crepitations

• Reduced air entry at lower lung zones

These findings suggested early congestive heart failure.

Clinical Evaluation

Differential Diagnosis

The following conditions were considered:

• Hypertensive heart disease

• Dilated cardiomyopathy

• Ischemic cardiomyopathy

• Valvular heart disease

• Pericardial effusion

• Congestive heart failure

Because of the long-standing history of uncontrolled hypertension, hypertensive cardiomyopathy was strongly suspected.

Investigations

Laboratory Evaluation

Complete blood count was normal.

Biochemical investigations revealed:

• Fasting blood glucose: 162 mg/dL

• HbA1c: 8.1%

• Total cholesterol: 242 mg/dL

• LDL cholesterol: 164 mg/dL

• Serum creatinine: 1.1 mg/dL

• Sodium: 138 mEq/L

• Potassium: 4.4 mEq/LChest Radiography

Posteroanterior chest X-ray revealed:

• Markedly enlarged cardiac silhouette

• Cardiothoracic ratio greater than 0.55

• Mild pulmonary vascular congestion

These findings were consistent with cardiomegaly.

Electrocardiography

Electrocardiogram demonstrated:

• Left ventricular hypertrophy

• Left axis deviation

• Nonspecific ST-T wave abnormalities

• Sinus rhythm

Transthoracic Echocardiography

Echocardiography demonstrated:

• Left ventricular hypertrophy

• Left ventricular dilatation

• Ejection fraction of 40%

• Mild mitral regurgitation

• Left atrial enlargement

• Grade II diastolic dysfunction

No significant pericardial effusion was noted.

Cardiac Magnetic Resonance Imaging

Cardiac MRI further confirmed:

• Enlarged left ventricular chamber

• Increased myocardial mass

• Absence of infiltrative cardiomyopathy

• No evidence of myocardial scar formation

Biomarker Assessment

Brain Natriuretic Peptide (BNP) level was elevated at 420 pg/mL, supporting the diagnosis of heart failure.

Diagnosis

Based on clinical findings, imaging studies, and cardiovascular evaluation, a diagnosis of: Cardiomegaly Secondary to Hypertensive Heart Disease with Early Congestive Heart Failure was established.

Management and Outcome

Initial Management

The patient was admitted for stabilization and optimization of medical therapy.

Treatment included:

• Intravenous loop diuretics

• Angiotensin-converting enzyme inhibitor

• Beta-blocker therapy

• Mineralocorticoid receptor antagonist

• Statin therapy

• Strict blood pressure control

Lifestyle interventions included:

• Sodium restriction

• Weight reduction

• Smoking cessation counseling

• Structured physical activity program

• Diabetic control optimization

Hospital Course

During hospitalization, the patient demonstrated:

• Improved breathing

• Reduction in lower limb edema

• Improved exercise tolerance

Blood pressure gradually improved to 132/80 mmHg.

No arrhythmias were observed during monitoring.

Follow-Up

At 1 Month

Clinical improvement included:

• Significant reduction in dyspnea

• Resolution of ankle edema

• Better exercise capacity

Blood pressure remained controlled.

At 3 Months

Repeat echocardiography demonstrated:

• Mild reduction in left ventricular dimensions

• Improved systolic function

• Ejection fraction increased to 45%

The patient reported improved quality of life and ability to perform daily activities.

At 12 Months

Long-term follow-up showed:

• Stable cardiac function

• Controlled hypertension

• No hospitalization for heart failure

• Sustained symptom improvement

The patient remained compliant with medications and lifestyle modifications.

Discussion

Pathophysiology

Cardiomegaly develops when the myocardium undergoes adaptive structural changes in response to chronic hemodynamic stress.

In hypertension, prolonged pressure overload leads to:

• Myocardial hypertrophy

• Increased ventricular wall thickness

• Progressive chamber enlargement

• Reduced ventricular compliance

Over time, compensatory mechanisms become insufficient, resulting in ventricular dysfunction and heart failure.

Neurohormonal activation involving:

• Renin-angiotensin-aldosterone system

• Sympathetic nervous system

• Inflammatory mediators

contributes significantly to disease progression.

Clinical Features

Symptoms vary depending on disease severity and underlying etiology.

Common manifestations include:

• Dyspnea on exertion

• Orthopnea

• Fatigue

• Peripheral edema

• Reduced exercise capacity

• Palpitations

• Chest discomfort

Advanced disease may lead to:

• Pulmonary edema

• Arrhythmias

• Cardiogenic shock

• Sudden cardiac death

Differential Diagnosis

Dilated Cardiomyopathy

Typically presents with marked ventricular dilation and reduced systolic function without a primary hypertensive cause.

Ischemic Cardiomyopathy

Associated with coronary artery disease and prior myocardial infarction.

Valvular Heart Disease

Valve abnormalities may cause secondary chamber enlargement and heart failure.

Pericardial Effusion

Can mimic cardiomegaly on chest radiographs but is distinguishable through echocardiography.

Congenital Heart Disease

May produce cardiac enlargement due to chronic volume overload.

Treatment Options

Management focuses on addressing the underlying cause and preventing progression.

Medical Therapy

Includes:

• ACE inhibitors or ARBs

• Beta-blockers

• Diuretics

• Mineralocorticoid receptor antagonists

• SGLT2 inhibitors when appropriate

• Lipid-lowering agents

Lifestyle Modification

Important measures include:

• Blood pressure control

• Dietary sodium restriction

• Weight management

• Regular physical activity

• Smoking cessation

Advanced Therapies

Severe cases may require:

• Cardiac resynchronization therapy

• Implantable cardioverter-defibrillator

• Ventricular assist devices

• Heart transplantation

Complications

Potential complications include:

• Chronic heart failure

• Atrial fibrillation

• Ventricular arrhythmias

• Stroke

• Thromboembolism

• Sudden cardiac death

• Progressive ventricular dysfunction

Early intervention significantly reduces the risk of these adverse outcomes.

Prognosis

The prognosis depends on:

• Underlying etiology

• Degree of ventricular dysfunction

• Timeliness of diagnosis

• Blood pressure control

• Treatment adherence

Patients diagnosed early and managed appropriately often achieve substantial symptom improvement and long-term stabilization.

Advances in cardiovascular imaging, pharmacotherapy, and heart failure management continue to improve patient outcomes.

Conclusion

Cardiomegaly is an important clinical indicator of underlying cardiovascular disease and may represent a precursor to heart failure if left untreated. This case demonstrates the impact of chronic uncontrolled hypertension on cardiac structure and function. Comprehensive diagnostic evaluation, including imaging and functional assessment, is essential for determining the underlying cause. Early initiation of evidence-based medical therapy and aggressive risk-factor modification can significantly improve symptoms, prevent disease progression, and enhance quality of life. Long-term follow-up remains critical for monitoring cardiac function and reducing cardiovascular morbidity and mortality.

References

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