2 1 Atrioventricular Block C5240044
A type of heart rhythm problem where electrical signals between the upper and lower chambers are slowed. May cause fatigue or dizziness. Treatment depends on heart rate and symptoms.
Key facts at a glance
- ICD-10
- I78.0
- ICD-11
- BA00.0
- Body system
- cardiovascular
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Slow Heart Rate
Heart rate significantly slower than normal, typically below 60 beats per minute, due to disrupted electrical signaling between heart chambers.
Seek immediate care if heart rate drops below 40 beats per minute or if you experience chest pain, severe dizziness, or fainting.
Fainting
Sudden temporary loss of consciousness caused by insufficient blood flow to the brain, often triggered by the slow heart rate.
Seek emergency care immediately if fainting occurs, as it may indicate a life-threatening arrhythmia.
Fatigue
(constitutional)Persistent tiredness and lack of energy due to reduced blood flow and oxygen delivery to body tissues.
Frequency: 60-80% of patients
Dizziness
(neurologic)Feeling of lightheadedness, unsteadiness, or faintness, often occurring when standing up quickly.
Frequency: 40-60% of patients
Shortness of Breath
(respiratory)Difficulty breathing or feeling breathless, especially during physical activity or when lying flat.
Frequency: 30-50% of patients
Exercise Intolerance
(constitutional)Inability to perform normal physical activities without excessive fatigue, shortness of breath, or dizziness.
Frequency: 40-60% of patients
Chest Discomfort
(cardiovascular)Pressure, tightness, or pain in the chest that may radiate to the arm, neck, or jaw, often associated with underlying heart disease.
Frequency: 15-25% of patients
Palpitations
(cardiovascular)Awareness of irregular, skipped, or forceful heartbeats, often described as fluttering or pounding in the chest.
Frequency: 10-20% of patients
Low Blood Pressure
(cardiovascular)Blood pressure readings lower than normal, which can contribute to dizziness and fainting symptoms.
Frequency: 15-25% of patients
Confusion
(neurologic)Mental confusion, difficulty concentrating, or memory problems resulting from reduced blood flow to the brain.
Frequency: 5-10% of patients
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
Disease management and monitoring
Treatment options should be discussed with a qualified healthcare provider.
Permanent Pacemaker Implantation
Surgical placement of a permanent pacemaker to maintain adequate heart rate and restore normal cardiac conduction.
Cardiac Monitoring
Continuous ECG monitoring and Holter studies to confirm diagnosis severity and guide treatment timing.
Additional treatment options
Temporary Pacing Support
Use of temporary transvenous or external pacing while preparing for definitive permanent device placement in acute settings.
medicationElectrophysiology Study
Invasive cardiac mapping to assess conduction system function and rule out reversible causes before permanent device placement.
procedureActivity Restrictions
Temporary activity limitations until definitive treatment, including avoidance of driving and strenuous exercise that may precipitate symptoms.
lifestyleWhen 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 2 1 Atrioventricular Block C5240044?
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.
ACC/AHA/HRS Guideline for Cardiac Pacing and Cardiac Conduction Disease. Circulation. 2023;148:e153-e224.
European Society of Cardiology (ESC) Guidelines on Cardiac Pacing and Cardiac Resynchronization Therapy. European Heart Journal. 2021;42(35):3427-3520.
ACC/AHA/HRS Guideline for the Evaluation and Diagnosis of Bradycardia and Cardiac Conduction Delay. Circulation. 2019;139:e798-e950.
Kusumoto FM, Schoenfeld MH, Barrett NR, et al. 2018 ACC/AHA/HRS Guideline on the Evaluation and Diagnosis of Syncope. Journal of the American College of Cardiology. 2020;75(8):e1-e70.
Zipes DP, Libby P, Bonow RO, et al. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 11th ed. Elsevier; 2019.
American Heart Association/American College of Cardiology Foundation. Third Universal Definition of Myocardial Infarction. Circulation. 2012;126(16):2020-2035.
Epstein AE, DiMarco JP, Ellenbogen KA, et al. ACC/AHA/HRS 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities. Journal of the American College of Cardiology. 2008;51(21):e1-e62.
Barold SS, Herweg B. Second-degree atrioventricular block: a reappraisal. Journal of Interventional Cardiac Electrophysiology. 2021;60(2):161-167.
Toff WD, Camm AJ, Skehan JD. Single-chamber versus dual-chamber pacing for high-grade atrioventricular block. NEJM. 2005;353(2):145-155.
Brignole M, Auricchio A, Baron-Esquivias G, et al. 2013 ESC Guidelines on cardiac pacing and cardiac resynchronization therapy. Europace. 2013;15(8):1063-1108.
Medication Comparisons
Compare medications used to treat 2 1 Atrioventricular Block C5240044. 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.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy