When are heart arrhythmias dangerous?

Heart arrhythmias are dangerous when people pass out or trigger cardiac arrest.

Dr. Douglas E. Severance, MD
Family Practitioner

Heart arrhythmias are dangerous when they prevent the heart from pumping blood to your body. Some arrhythmias are more dangerous than others. Dangerous arrhythmias can cause chest pain, dizziness, stroke and death.

Arrhythmias, such as abnormal fast rhythms coming from the bottom chambers ( ventricular tachycardia or ventricular fibrillation), can be life threatening and can cause sudden cardiac arrest. Any suspected arrhythmia requires prompt medical evaluation, as it is hard to distinguish benign versus lethal abnormal rhythms from subjective symptoms alone.

Dr. Andrea C. Bryan, MD
Cardiologist (Heart Specialist)

Arrhythmias can produce a broad range of symptoms, from barely perceptible to very serious. A heart arrhythmia has become dangerous if symptoms develop, such as fatigue, dizziness, lightheadedness, fainting or near-fainting spells, rapid heartbeat or pounding, shortness of breath or chest pain. In extreme cases, a severe arrhythmia can cause collapse or sudden cardiac death.

The contents of this website are for informational purposes only and are not intended to be a substitute for professional medical advice, diagnosis, or treatment. Nor does the contents of this website constitute the establishment of a physician patient or therapeutic relationship. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Continue Learning about Arrhythmia

Concerned about Afib? Get Aggressive about Losing Weight
Concerned about Afib? Get Aggressive about Losing Weight
Some people describe a surge of romantic passion as your heart “skipping a beat,” but if your doctor tells you this, it may mean you have (or are head...
Read More
What is cardiac arrhythmia?
Univ. of Nev. School of Medicine, Family MedicineUniv. of Nev. School of Medicine, Family Medicine
Cardiac arrhythmia means that the regular speed and timing of the heartbeat is now abnormal. There a...
More Answers
When should I call my doctor after an electrophysiology (EP) study?
Intermountain Registered DietitiansIntermountain Registered Dietitians
Call the doctor if you experience any of these: A fever over 101° F Redness, swelling, drainag...
More Answers
What Are Some Common Issues with Heart Rhythms?
What Are Some Common Issues with Heart Rhythms?

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.