Heart Failure’s Quiet Companion: The Risk of Blood Clots

Heart failure (HF) is a serious condition that affects millions of people worldwide and is becoming more common as the population ages. Most people know that it causes fatigue, swelling, and shortness of breath. Few realize that the condition also increases the risk of blood clots.

Raising awareness about this connection is one step forward in improving outcomes for those living with heart failure.

HF occurs when the heart has trouble pumping properly. The walls of the heart might be stiff or damaged, or the heart muscle might not pump as strongly as it should. These problems can raise pressure in the heart or reduce its ability to circulate enough blood to support the body, whether at rest or during activity.

HF can affect different parts of the heart, resulting in:

As part of the body’s natural healing process, blood clots form when a blood vessel has become damaged. Platelets and proteins in the blood work together to create a clot that stops bleeding and protects the injured area. Sometimes, clots can form inside blood vessels even when there’s no clear injury, or they may not break down as they should, leading to serious health risks.

HF raises the risk of blood clots in several ways, including slowing blood flow and damaging blood vessels. These changes create conditions where dangerous clots, like deep vein thrombosis (DVT) or pulmonary embolism (PE), are more likely to form.

Heart failure can damage the walls of blood vessels, leading to endothelial dysfunction, a condition where the vessel lining loses its ability to work properly. Increased pressure in the vessels, abnormal blood flow, and oxidative stress—an imbalance of harmful molecules that damages the vessel lining—are key contributors. Over time, this damage weakens the vessels’ ability to relax and regulate blood flow.

Inflammation in HF raises levels of clot-promoting molecules like fibrinogen. It also activates platelets, making them stickier and more likely to form clots. Oxidative stress disrupts the blood’s natural balance between clotting and anti-clotting factors. Medications used to reduce fluid buildup in HF can increase blood concentration and further promote clot formation.

When HF reduces the heart’s pumping ability, it can lead to low cardiac output, where less blood is pumped out than normal. Over time, the heart’s chambers may stretch and enlarge, further weakening its function. This slower blood flow increases the risk of blood clots.

Atrial fibrillation (Afib), a common condition in people with HF, can further disrupt blood flow. In Afib, the heart’s irregular rhythm causes blood to pool in the atria, the two chambers of the heart that receive blood and pump it into the ventricles. This pooling creates an environment where clots are more likely to form. These clots can travel to the brain, leading to a stroke.

Take your medications as prescribed and follow your clinician’s advice for managing other conditions that can make HF worse. Follow these tips to help manage HF and reduce your risk of blood clots:

• Manage stress: Use healthy coping methods like deep breathing, yoga, or joining a support group.
• Stay physically active: Regular movement improves heart health and prevents blood from pooling.
• Stop smoking: Smoking increases your heart rate and blood pressure and reduces your ability to stay physically active.
• Eat heart-healthy foods: Focus on fruits, vegetables, whole grains, lean proteins, and healthy fats. Limit processed foods, sugar, salt, and red meat.
• Get enough rest: Take breaks to reduce strain on your heart. Napping, putting your feet up, or sitting during tasks can prevent overexertion. For better sleep, avoid caffeine, alcohol, and heavy meals before bed.

HF can lead to blood clots, but understanding the connection can help you take control. Small, consistent steps—like following your care plan and addressing risk factors—can make a big difference in protecting your health.