Systolic vs Diastolic Heart Failure – An Overview

Heart failure is a common and serious condition that affects how well your heart pumps blood to the rest of your body. However, “heart failure” is not a single disease; it comes in different forms. Two major forms are systolic vs diastolic heart failure, and understanding the difference between both forms is crucial for diagnosis, treatment, and long-term management.

This blog explains both conditions in clear terms, explores their causes and symptoms, and discusses how doctors diagnose and treat them today. It also highlights ongoing research, including relevant clinical trials and related complications.

What Is Heart Failure?

Heart failure is a condition where the heart cannot supply enough blood to meet the body’s demands. The left ventricle, the main pumping chamber, is usually affected. When the left ventricle fails, it is called left-sided heart failure. There are two forms of this type of heart failure:

• Systolic heart failure: The heart cannot contract forcefully, reducing the volume of blood pumped out.
• Diastolic heart failure: The heart is stiff and cannot fill properly, even if contraction appears normal.

Both forms reduce blood flow, causing fatigue, shortness of breath, and fluid retention.

Key Differences Between Systolic and Diastolic Heart Failure

The difference between systolic and diastolic heart failure lies in their definition, causes, symptoms, and treatment.

Systolic Heart Failure

Systolic heart failure is a form of heart failure where the heart muscle loses strength. When the heart contracts (squeezes), it cannot push out a normal amount of blood. This results in low cardiac output and forces the heart to work harder with each beat.

In clinical settings, this type of heart failure is usually identified by a reduced ejection fraction (EF), a measure of how much blood the left ventricle pumps out with each beat. A lower-than-normal EF suggests that the heart is not pumping efficiently.

Diastolic Heart Failure

Diastolic heart failure, also known as heart failure with preserved ejection fraction (HFpEF) or chronic diastolic heart failure happens not because the heart can’t pump blood, but because it can’t relax and fill with enough blood between beats.

In this condition, the left ventricle becomes stiff or thickened, preventing normal filling and leading to increased pressure within the heart and lungs. The ejection fraction may be normal, but the total amount of blood the heart handles is reduced.

Causes

Heart failure develops due to underlying conditions that weaken or stiffen the heart. Understanding the root causes is crucial for prevention and treatment.

Systolic Heart Failure Causes

• Coronary artery disease or past heart attacks weaken the heart muscle.
• Long-standing high blood pressure forces the heart to work harder.
• Cardiomyopathy leads to enlarged, weakened heart chambers.
• Viral infections or toxins can damage the myocardium.
• Excessive alcohol or drug use may reduce heart function.

Diastolic Heart Failure Causes

• Chronic hypertension thickens the heart muscle, reducing flexibility.
• Age-related changes naturally stiffen the heart.
• Obesity and diabetes affect heart structure and function.
• Coronary artery disease reduces blood supply, impairing relaxation.
• Infiltrative diseases like amyloidosis deposit abnormal proteins in the heart.

Symptoms

Recognizing symptoms early allows for prompt treatment and better management of heart failure.

Systolic Heart Failure Symptoms

• Shortness of breath during activity or lying down
• Fatigue and reduced exercise capacity
• Swelling in the legs, ankles, or abdomen
• Rapid or irregular heartbeat

Diastolic Heart Failure Symptoms

• Breathlessness on exertion or at night
• Fatigue and low energy
• Swelling in lower limbs
• Heart palpitations

Diagnosis

Early and accurate diagnosis helps tailor treatments and improve outcomes for patients.

Systolic Heart Failure Diagnosis

• Echocardiogram to measure ejection fraction
• ECG to detect arrhythmias or heart damage
• Blood tests to evaluate heart function and imaging studies

Diastolic Heart Failure Diagnosis

• Echocardiogram and Doppler studies assess heart filling pressures
• Medical history and symptom evaluation
• Assessment of underlying conditions, such as hypertension or diabetes

Treatment and Management

Treatment aims to improve heart function, reduce symptoms, and prevent complications.

Systolic Heart Failure Treatment

• Medications: ACE inhibitors, beta-blockers, diuretics
• Devices: Pacemakers or defibrillators in advanced cases
• Lifestyle changes: Low-sodium diet, regular exercise, weight management

Diastolic Heart Failure Treatment

• Medications: Diuretics to manage fluid, antihypertensives (ACE inhibitors, ARBs, calcium channel blockers)
• Lifestyle: Weight control, exercise, and salt restriction
• Comorbidity management: Managing diabetes, high blood pressure, and other conditions

Summary Table: Systolic vs Diastolic Heart Failure

Feature	Systolic Heart Failure	Chronic Diastolic Heart Failure
Heart function	Weak contraction, poor pumping	Stiff ventricles, poor filling
Ejection fraction	Reduced	Preserved
Common causes	Heart attack, cardiomyopathy	Hypertension, aging, and diabetes
Symptoms	Fatigue, swelling, breathlessness	Fatigue, breathlessness, swelling
Treatment	Strengthen heart, reduce workload	Manage BP, relieve congestion

Complications To Watch For

Heart failure, whether systolic or diastolic, can lead to serious complications.

One major issue is fluid buildup in the lungs, known as pulmonary congestion, which causes severe shortness of breath and increases the risk of respiratory distress.

Another serious problem is cardiorenal syndrome, where the failing heart leads to kidney dysfunction, and the damaged kidneys, in turn, worsen heart failure. Managing fluid balance and kidney function is essential in advanced cases.

Role of Clinical Research

Clinical research is essential for improving treatment and outcomes in heart failure. Studies like the clinical trial for elevated lipoprotein(a) and ASCVD explore whether lowering lipoprotein(a) can reduce cardiovascular risk, offering insights into new therapies.

Moreover, participation in cardiology clinical trials gives patients access to innovative medications and devices, while helping doctors gather data on safety and effectiveness. Clinical research advances understanding of both systolic and diastolic heart failure and helps tailor treatments to individual needs.

Living with Heart Failure

Patients with heart failure can live active lives by following medical guidance:

• Regular check-ups and early diagnosis
• Strict adherence to medications
• Heart-healthy lifestyle: Diet, exercise, weight control
• Monitoring for fluid retention or worsening symptoms
• Participation in clinical trials for access to new therapies

Conclusion

Understanding systolic vs diastolic heart failure is crucial for effective management. Systolic heart failure involves weak heart contractions, while chronic diastolic heart failure involves stiff ventricles that cannot fill properly. Both types can lead to serious complications, including pulmonary congestion and cardiorenal syndrome. Early diagnosis, proper treatment, and lifestyle management are key to improving symptoms and quality of life.

Additionally, patients seeking new treatment options can participate in clinical studies conducted by Lucida Clinical Trials and explore their clinical trials in Massachusetts to access potential new therapies, close medical monitoring, and an opportunity to contribute to research that advances heart failure care.