Mobitz I Atrioventricular Block C0264907
A type of heart rhythm disorder where electrical signals between the upper and lower chambers are intermittently delayed or blocked. It may cause dizziness or fatigue. Treatment depends on symptoms and may include monitoring or a pacemaker.
Key facts at a glance
- ICD-10
- I78.0
- ICD-11
- BA00.0
- Body system
- cardiovascular
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Syncope
Chest discomfort or palpitations
(cardiovascular)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Palpitations
(cardiovascular)Dizziness
(cardiovascular)Fatigue
(cardiovascular)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Ambulatory ECG monitoring
Extended Holter monitoring to assess block frequency, duration, and relationship to symptoms. Helps determine if the conduction abnormality is stable, progressive, or associated with pauses requiring intervention.
Disease management and monitoring
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Review and adjust offending medications
Systematic review of all cardiac and non-cardiac medications that may affect AV node conduction. Common culprits include beta-blockers, calcium channel blockers, digoxin, and certain antiarrhythmics.
Additional treatment options
Activity modification and symptom awareness
Education about recognizing symptoms such as lightheadedness or syncope, and guidance on avoiding activities where sudden symptom onset could be dangerous until the condition is fully evaluated.
lifestyleTemporary pacing evaluation
Assessment of need for temporary pacing if symptomatic bradycardia or pauses occur. Usually performed in hospital setting while underlying cause is addressed.
procedurePermanent pacemaker consideration
Reserved for patients with symptomatic Mobitz I who fail to improve, develop Mobitz II pattern, or have syncope. Requires detailed electrophysiology evaluation before implantation.
surgicalWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Mobitz I Atrioventricular Block C0264907?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Brignole M, Auricchio A, Baron-Esquivias G, et al. 2013 ESC Guidelines on cardiac pacing and cardiac resynchronization therapy. Europace. 2013;15(8):1070-1118.
Kashani A, Barold SS. Significance of QRS complex duration in patients with heart failure. Pacing Clin Electrophysiol. 2005;28(5):402-410.
Barold SS, Ilina M, Leonelli F, Spragg DD. Frequency-dependent and physiologic gating effects on AV nodal conduction in man. J Cardiovasc Electrophysiol. 2006;17(7):732-740.
Bissoon AK, Bharucha S, Cairns DK. Management of second-degree AV block: comparison of outcomes in athletes and non-athletes. Heart Rhythm. 2012;9(5):748-754.
Medication Comparisons
Compare medications used to treat Mobitz I Atrioventricular Block C0264907. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy