What Is a Heart Arrhythmia? Signs You Should Never Ignore

Your heart beats around 100,000 times a day. Most of those beats happen without a single conscious thought — steady, rhythmic, effortless. When that rhythm breaks down, the result is a heart arrhythmia: a disruption in the electrical signals that coordinate the heart’s pumping action. Some arrhythmias are brief and benign. Others are persistent, debilitating, or life-threatening. The challenge is that they do not always announce themselves clearly — and in a region like the UAE, where summer heat, high stress levels, and undetected underlying conditions create additional cardiac pressure, recognising the warning signs early is genuinely important.

The cardiologists in Dubai at German Heart Centre — a leading health centre in Dubai Healthcare City with over 20 years of cardiovascular expertise — see arrhythmia presentations across the full spectrum, from incidental findings on a routine ECG test to acute emergencies. Here is what every UAE resident should understand about this condition.

What Is a Heart Arrhythmia?

An arrhythmia occurs when the electrical system that controls the heartbeat fires too fast, too slow, or irregularly. The heart’s electrical signal normally starts in the sinoatrial node in the right atrium, travels through a structured pathway, and triggers each chamber to contract in the correct sequence. Any disruption to that pathway — whether from damaged tissue, an electrolyte imbalance, a structural defect, or an external trigger — can produce an arrhythmia.

The term covers a wide range of conditions, not a single diagnosis. What they share is disruption of the heart’s natural rhythm — and the potential, depending on type and severity, to affect the heart’s ability to pump blood effectively throughout the body.

The Main Types of Heart Arrhythmia

Atrial Fibrillation (AFib)

Atrial fibrillation is the most commonly diagnosed arrhythmia in clinical practice. Instead of one organised contraction, the heart’s upper chambers quiver chaotically, producing an irregular and often rapid heart rate. Beyond direct symptoms — palpitations, breathlessness, fatigue — AFib carries a significantly elevated risk of stroke, because the disorganised atrial movement can allow blood to pool and clot. It is a condition that demands prompt identification and structured management.

Ventricular Tachycardia (VT) and Ventricular Fibrillation (VF)

These arrhythmias originate in the heart’s lower chambers. Ventricular tachycardia produces a rapid heart rate that may or may not cause symptoms initially. Ventricular fibrillation is the most dangerous: the ventricles quiver rather than contract, effectively stopping the heart from pumping blood. VF is the leading electrical cause of sudden cardiac arrest and requires immediate emergency intervention.

Supraventricular Tachycardia (SVT)

SVT refers to a group of arrhythmias originating above the ventricles that produce episodes of sudden-onset rapid heartbeat. These episodes can begin and end abruptly, lasting seconds to hours. While not usually immediately life-threatening, SVT causes significant distress and, in patients with underlying heart disease, can carry more serious consequences.

Bradycardia and Heart Block

Not all arrhythmias involve a fast heart rate. Bradycardia — a persistently slow heart rate — causes fatigue, dizziness, fainting, and reduced exercise tolerance. Heart block occurs when the electrical signal between the atria and ventricles is delayed or interrupted, which in severe cases may require a pacemaker to maintain adequate cardiac function.

Premature Beats

Premature ventricular contractions (PVCs) and premature atrial contractions feel like a skipped beat or a brief flutter in the chest. Occasional PVCs are common and often harmless in people with structurally normal hearts. Frequent or complex PVCs — particularly in patients with existing heart disease — require evaluation and, in some cases, treatment.

Warning Signs of a Heart Arrhythmia You Should Not Ignore

Arrhythmias do not always produce symptoms. Many are found incidentally on a routine ECG in Dubai or Holter monitoring test performed for a different reason. When symptoms do occur, they range from mildly inconvenient to acutely dangerous. The following warrant evaluation — not dismissal:

• Palpitations. A noticeable awareness of the heartbeat — racing, pounding, fluttering, or a sensation of the heart “skipping” — is the most common arrhythmia symptom. Episodes lasting more than a few minutes, occurring frequently, or associated with dizziness should always be assessed by a cardiac specialist.
• Breathlessness without exertion. Unexplained shortness of breath at rest or during minimal activity, when not explained by a respiratory condition, can indicate the heart is not pumping efficiently due to a rhythm disturbance.
• Dizziness or lightheadedness. Reduced cardiac output during an arrhythmia can transiently decrease blood flow to the brain, causing dizziness, near-fainting (presyncope), or actual fainting (syncope).
• Chest discomfort. Tightness, pressure, or a dull ache during an episode of palpitations indicates the heart is working under strain. Palpitations combined with chest discomfort require urgent evaluation by a heart doctor in Dubai UAE.
• Disproportionate fatigue. Persistent, unexplained fatigue — particularly if it has worsened over weeks — can indicate a chronic arrhythmia gradually reducing the heart’s pumping efficiency.
• Fainting or collapse. Syncope during or after palpitations is a red-flag symptom requiring immediate cardiac assessment. It may indicate a ventricular arrhythmia with serious clinical implications.

What Triggers Arrhythmias — and What Makes Them Worse

Identifying triggers helps reduce episode frequency and guides clinical investigation. Common arrhythmia triggers include:

• Electrolyte imbalances. Low potassium, magnesium, or sodium — common during UAE summer through sweating — directly disrupt the heart’s electrical system and lower the threshold for arrhythmia.
• Thyroid dysfunction. Both overactive and underactive thyroid alter heart rate and rhythm. A thyroid function test is a standard component of arrhythmia workup at German Heart Centre.
• Hypertension. Elevated blood pressure over time alters the structure of the heart’s chambers, creating the substrate for arrhythmias. Our hypertension treatment team works closely with arrhythmia patients for this reason.
• Coronary artery disease and heart failure. Scarred or poorly perfused cardiac tissue disrupts normal electrical conduction pathways.
• Excessive caffeine, alcohol, or stimulants. These directly raise heart rate and can trigger episodes in predisposed individuals.
• Sleep apnoea. Nocturnal oxygen desaturation during untreated sleep apnoea is a recognised and underappreciated trigger for AFib.
• Acute psychological stress. Adrenaline released during intense stress lowers the threshold for arrhythmia in vulnerable patients.

How Arrhythmias Are Diagnosed at German Heart Centre

Because arrhythmias are frequently intermittent, the right diagnostic tool at the right time is essential. At German Heart Centre, our diagnostic pathway for suspected arrhythmia includes:

Electrocardiogram (ECG): A resting ECG test in Dubai captures the heart’s electrical activity at that moment. It identifies persistent arrhythmias, conduction abnormalities, and structural changes that elevate arrhythmia risk. It is quick, non-invasive, and provides immediate clinical information.

Holter Monitoring: A Holter monitoring test records cardiac rhythm continuously over 24 to 48 hours during normal daily activity. This is the standard investigation for arrhythmias that do not appear on a resting ECG — it captures episodes that occur during exercise, sleep, or stress, providing the data clinicians need to assess frequency, type, and clinical significance.

Cardiopulmonary Exercise Testing (CPET): For arrhythmias triggered specifically by physical exertion, a CPET evaluates the heart’s electrical and functional response under controlled exercise conditions, identifying rhythm disturbances that only appear under cardiovascular load.

Blood Tests: Electrolyte panels, thyroid function, and kidney function tests identify reversible contributing factors that, once addressed, may reduce arrhythmia burden without long-term medication.

Treatment Options for Heart Arrhythmia

Treatment is tailored to the arrhythmia type, frequency, severity, and the patient’s overall cardiac health. Options available at German Heart Centre include:

Medication: Antiarrhythmic drugs, rate-control agents, and anticoagulants — for AFib patients to reduce stroke risk — form the foundation of medical management. Medication review is essential, as some commonly prescribed drugs can contribute to or worsen arrhythmias.

Cardioversion: For persistent AFib or specific other arrhythmias, cardioversion — electrical or pharmacological — restores normal rhythm in a controlled clinical setting with appropriate monitoring and preparation.

Catheter Ablation: Through interventional cardiology, catheter ablation targets and eliminates the tissue responsible for generating the abnormal electrical signal. It is highly effective for certain arrhythmia types, including AFib and SVT, and is performed by our interventional cardiologists in Dubai.

Pacemakers and Implantable Devices: For bradycardia, heart block, or high-risk ventricular arrhythmias, implantable devices — pacemakers or implantable cardioverter-defibrillators (ICDs) — provide ongoing rhythm support. Our cardiac surgery team manages implantation for patients requiring device therapy.

Arrhythmias in Children: When Paediatric Cardiac Care Matters

Arrhythmias are not confined to adults. Children with congenital heart conditions, structural abnormalities, or inherited electrical disorders can experience rhythm disturbances requiring specialist evaluation. A child reporting palpitations, repeated dizziness during play, or unexplained fainting should be assessed by a paediatric cardiologist in Dubai promptly.

Dr. Jörg Müller-Scholtz, our paediatric cardiology specialist, evaluates children with suspected arrhythmias using age-appropriate diagnostic tools. Appointments are available through our paediatric cardiology service.

When to See a Cardiologist About a Possible Arrhythmia

Book a cardiology appointment promptly if you experience:

• Palpitations lasting more than a few minutes or recurring regularly
• Any episode of fainting or near-fainting, with or without associated palpitations
• Breathlessness or chest discomfort accompanying a fast or irregular heartbeat
• A family history of sudden cardiac death or inherited arrhythmia conditions
• A new diagnosis of hypertension, heart failure, or thyroid disease — all associated with arrhythmia development

Seek emergency cardiac care immediately if:

• Collapse or loss of consciousness occurs with or without warning
• Chest pain accompanies a racing or strongly irregular heartbeat
• Acute breathlessness develops alongside an irregular pulse

Our emergency cardiac service is equipped to manage acute arrhythmia presentations. For planned consultations, our cardiology care packages provide a structured diagnostic and management pathway. Our high-risk care packages are available for patients with elevated arrhythmia risk profiles.

Expert Arrhythmia Care at German Heart Centre Dubai

Our team of German cardiologists in UAE brings European-standard training and clinical depth to every arrhythmia case. Dr. Ashraf Hussein, Dr. Eissa Mhanna, Dr. Kashif Souri, Dr. Helge Alexy, Dr. Caspar A Boerner, Dr. Beate Wild, and Dr. Masahide Nagano are each available for consultations at our health centre in Dubai Healthcare City. For complex cases requiring surgical intervention, Prof. Dr. Sergey Leontyev and Prof. Dr. Uwe Klima provide full cardiac and thoracic surgical care within the same centre.

Check your insurance coverage, explore our annual health packages, or visit our doctors page to book your arrhythmia consultation with a heart doctor in Dubai UAE today. You can also read more cardiac health guidance across our heart health blog.