Feeling constantly tired is often blamed on stress, lack of sleep, or a busy lifestyle. However, in some cases, persistent fatigue may be linked to a slow heart rate. While physically fit individuals can
naturally have a lower resting heart rate without any concern, ongoing exhaustion that does not improve with rest may indicate that the heart is not pumping enough blood to meet the body’s needs.
“Fatigue is one of the most commonly overlooked symptoms of a slow heart rate. When the heart does not pump efficiently, the body may not receive enough oxygen-rich blood, which can lead to persistent tiredness,” explains Dr Sajan Ahmad, Senior Interventional Cardiologist and Director – Clinical Affairs and Academics at Tiruvalla Medical Mission Hospital, Kerala.
The heart’s rhythm is regulated by the sinoatrial (SA) node, the body’s natural pacemaker, which sends steady electrical signals to maintain a normal heart rate between 60 and 100 beats per minute (BPM). When the heart rate falls below 60 BPM, a condition known as bradycardia, these signals may become delayed or weakened, causing the heart to beat more slowly. As a result, blood circulation slows, and vital organs may not receive adequate oxygen.
The challenge lies in distinguishing between harmless and concerning slow heart rates. Trained athletes often have efficient hearts that beat more slowly even below 40 BPM without causing harm. This is known as physiological bradycardia. However, when a slow heart rate is accompanied by symptoms such as persistent fatigue, unexplained breathlessness during routine activities, dizziness, or episodes of fainting, it warrants prompt medical attention.
Recognising the Body’s Signals
When the heart beats too slowly, the brain and other organs may not receive sufficient oxygen-rich blood. This can lead to fatigue, light-headedness, confusion, shortness of breath, or even fainting. While a low resting heart rate can be normal in certain individuals, persistent or worsening symptoms should never be ignored.
“Symptoms such as unexplained fatigue, dizziness, or fainting should not be dismissed as routine tiredness. They may indicate that the heart’s electrical system is not functioning properly,” says Dr. Ahmad.
Several factors can contribute to bradycardia, including advancing age, underlying heart disease, and disturbances in the heart’s electrical pathways. Certain medications, such as beta-blockers and calcium channel blockers, may also slow the heart rate. Chronic conditions like diabetes and high blood pressure, as well as electrolyte imbalances, can further increase the risk.
Diagnosis and Management
Bradycardia is typically diagnosed using an electrocardiogram (ECG). In some cases, a Holter monitor may be used to record heart activity continuously over 24 to 48 hours. Occasionally, an electrophysiological study may be required to assess the heart’s electrical function in greater detail.
Treatment depends on the severity of the condition and its underlying cause. Mild cases may only require medication adjustments or lifestyle modifications.
The Role of Pacemakers and Leadless Innovation
A pacemaker is a small medical device that delivers electrical impulses to maintain a steady heartbeat. It is recommended for patients with symptomatic bradycardia, particularly when the heart’s natural pacing system fails.
Traditional pacemakers use leads (wires) that connect the device to the heart and are placed under the skin in the chest. Although effective, these systems carry a small risk of lead-related complications such as fracture, displacement, or infection.
A significant advancement in recent years is the development of leadless pacemakers. These miniature, self-contained devices are implanted directly into the heart, eliminating the need for leads and a surgical pocket.
“Leadless pacemakers represent an important advancement in cardiac care. They reduce the risk of lead-related complications and offer a minimally invasive option for suitable patients,” explains Dr. Ahmad.
This approach can reduce the risk of infection, shorten recovery time, and improve patient comfort. It is particularly beneficial for individuals with difficult venous access or a history of device-related infections.
Today, most individuals with a pacemaker can lead normal, active lives. Modern devices are reliable and can adapt to the body’s needs, allowing patients to return to work, travel, and moderate exercise.
“Early recognition of symptoms is crucial. If persistent fatigue, dizziness, or fainting occurs, consulting a cardiologist promptly can help ensure timely diagnosis and appropriate treatment,” advises Dr. Ahmad.
Disclaimer
Any and all information provided in this article reflects the independent views expressed by Dr. Sajan Ahmad, Senior Interventional Cardiologist and Director – Clinical Affairs and Academics, Tiruvalla Medical Mission Hospital, Kerala, and is intended for general awareness and educational purposes only. It should not be considered medical advice. Readers are advised to consult a registered medical practitioner for any medical concerns or clarification related to this information.
