Long Qt Syndrome 3 Acquired Susceptibility To C1838527
A heart rhythm condition causing prolonged recovery time between beats, increasing risk of dangerous arrhythmias. Beta blockers and lifestyle modifications are common treatments.
Key facts at a glance
- ICD-10
- I45.81
- 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
Syncope
Palpitations
Seizure-like episodes
Sudden cardiac arrest
Chest discomfort or palpitations
(cardiovascular)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
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
Beta-blocker therapy
Beta-blockers are the cornerstone of acquired Long QT syndrome management, reducing cardiac events by decreasing heart rate and preventing catecholamine-triggered arrhythmias. Common agents include propranolol or nadolol under cardiology supervision.
Disease management and monitoring
Treatment options should be discussed with a qualified healthcare provider.
QT-prolonging drug avoidance
Systematic review and discontinuation of all medications known to prolong the QT interval, including certain antibiotics, antifungals, and antiarrhythmics. Consultation with a pharmacist is recommended to identify safer alternatives.
Additional treatment options
Continuous ECG monitoring
Inpatient or outpatient cardiac monitoring to assess QTc interval changes and identify potential arrhythmia triggers. Holter monitoring or event recorders may be used for extended assessment.
monitoringElectrolyte management
Maintain optimal serum potassium and magnesium levels through diet or supplementation, as electrolyte abnormalities can exacerbate QT prolongation. Regular blood testing to monitor levels.
lifestyleStress reduction techniques
Mindfulness, relaxation training, and stress management programs to reduce emotional triggers that may precipitate arrhythmias. May include meditation, yoga, or counseling.
complementaryWhen 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 Long Qt Syndrome 3 Acquired Susceptibility To C1838527?
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.
Tracy CM, Ackerman MJ, Asirvatham SJ, et al. 2017 AHA/ACC/HRS Guideline for Management of Patients With Ventricular Arrhythmias and the Prevention of Sudden Cardiac Death. Heart Rhythm. 2017.
Schwartz PJ, Ackerman MJ, Wilde AAM. Long QT Syndrome 3: Clinical Manifestations, Pathophysiology, and Treatment. JACC Clin Electrophysiol. 2021.
Mazzanti A, Maragna R, Vacanti G, et al. Efficacy and Safety of Ranolazine for the Treatment of Long QT Syndrome Type 3: A Randomized Clinical Trial. JAMA Cardiol. 2022.
Savage Z, Kuchar D, Sy RW. Risk Stratification in Long QT Syndrome: Systematic Review and Meta-Analysis. Heart Lung Circ. 2020.
Medication Comparisons
Compare medications used to treat Long Qt Syndrome 3 Acquired Susceptibility To C1838527. 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 20, 2026. · Read our editorial policy