About-Cardio
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We provide our users the most up-to-date and accurate information on the treatment and prevention of cardio pathologies in accordance with current American and European clinical guidelines.
The information provided on this website is for educational purposes only and should not be considered medical advice. Always consult a licensed physician for diagnosis and treatment.
Understanding Sinus Rhythm on ECG
Introduction
Sinus rhythm is the normal electrical activity of the heart, originating from the sinoatrial (SA) node. Recognizing sinus rhythm on an electrocardiogram (ECG) is crucial as it indicates normal heart function.
Characteristics of Sinus Rhythm on ECG
To determine if an ECG shows a sinus rhythm, it must meet the following criteria:
- P wave presence: Each QRS complex is preceded by a P wave.
- Regular rhythm: The RR intervals (time between QRS complexes) are consistent.
- Heart rate: The normal resting sinus rhythm ranges from 60 to 100 beats per minute (bpm).
- P wave morphology: The P wave should be upright in leads I, II, and aVF, and inverted in aVR.
- Constant PR interval: The duration of the PR interval (usually 120–200 ms) remains stable between beats.
Clinical Significance
- Normal sinus rhythm is a sign of a healthy conduction system.
- If deviations from sinus rhythm occur, they may indicate arrhythmias such as atrial fibrillation, sinus bradycardia, or tachycardia.
- Certain medical conditions (e.g., electrolyte imbalances, ischemic heart disease) can disrupt sinus rhythm.
When to See a Doctor
If you experience symptoms such as palpitations, dizziness, fainting, or chest pain, consult a doctor to evaluate your heart rhythm further.
Conclusion
Recognizing sinus rhythm on an ECG helps in assessing heart health. Regular check-ups and ECG monitoring can detect abnormalities early, ensuring timely medical intervention.
Source recommendations
1. American Heart Association ECG Interpretation Guidelines
- https://www.heart.org/en/health-topics/heart-attack/diagnosing-a-heart-attack/electrocardiogram-ecg-or-ekg
- https://www.ahajournals.org/doi/10.1161/circulationaha.108.191095
- https://www.heart.org/-/media/files/affiliates/mwa/kansas-city/kc-cardiac-and-stroke-symposium/2020-event-documents/cardiac-presentations/2-ecg-hockstad.pdf?la=en
- https://www.ahajournals.org/doi/10.1161/circulationaha.108.191098
- https://pubmed.ncbi.nlm.nih.gov/19281931/
2. European Society of Cardiology Guidelines on Arrhythmias
- https://www.escardio.org/Guidelines/Clinical-Practice-Guidelines/Ventricular-Arrhythmias-and-the-Prevention-of-Sudden-Cardiac-Death
- https://academic.oup.com/eurheartj/article/43/40/3997/6675633
- https://www.escardio.org/Guidelines/Clinical-Practice-Guidelines/Supraventricular-Tachycardia
- https://pubmed.ncbi.nlm.nih.gov/36017572/
- https://www.ahajournals.org/doi/10.1161/01.cir.0000091380.04100.84
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If you or your loved ones experience any of these symptoms, you should consult a doctor in time. Remember that self-medication can be dangerous, and timely diagnosis will preserve the quality and life expectancy.
The heart is an organ that does not know how to "keep silent" if something goes wrong. Chest pain, shortness of breath, swelling, dizziness, and rhythm disturbances are the symptoms that require our attention. The best prevention of heart disease is careful attention to your health, regular checkups with a doctor, and a healthy lifestyle. Take care of your heart, and it will serve you for many years!
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Best practices from USA, EU and Japan
Our answers to your questions are based on the clinical recommendations of countries with the most developed healthcare systems in the field of cardiology in the USA, the EU and Japan.
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We monitor all innovations and changes in the field of cardiac disease treatment on a daily basis.
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Every 3-5 years, half of the scientific approaches to treatment in the field of cardiology are reviewed as a result of specialized scientific discoveries. With us, you don't have to wait these years to learn about the best ways to treat you and your loved ones.