Acquired Susceptibility To Long Qt Syndrome 1 C1843738
A heart rhythm problem where certain medicines or conditions cause dangerously long pauses between beats. Affected people must avoid specific drugs and be monitored.
Key facts at a glance
- ICD-10
- I45.81
- ICD-11
- BA00.0
- Body system
- cardiovascular
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Syncope
Palpitations
Chest discomfort
Chest discomfort or palpitations
(cardiovascular)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Dizziness
(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
Beta-Adrenergic Blockers
Beta-blockers are the primary pharmacological intervention for acquired long QT syndrome, reducing cardiac events by decreasing sympathetic drive and preventing stress-triggered arrhythmias.
Disease management and monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Strenuous Exercise Avoidance
Avoidance of competitive sports, intense physical exertion, and swimming alone is essential, as exercise and emotional stress are common triggers for dangerous arrhythmias in susceptible individuals.
Additional treatment options
Sodium Channel Blockers
Medications such as flecainide or mexiletine may be considered as adjunctive therapy in select patients to reduce arrhythmia burden, though their use requires careful monitoring and expertise.
medicationLeft Cardiac Sympathetic Denervation
Surgical removal of the left stellate ganglion reduces sympathetic innervation to the heart, significantly decreasing arrhythmia risk in patients who fail medical management.
surgicalImplantable Loop Recorder Monitoring
Continuous rhythm monitoring with an implantable device allows detection of asymptomatic arrhythmias and helps guide therapy adjustments in high-risk patients.
monitoringWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Acquired Susceptibility To Long Qt Syndrome 1 C1843738?
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.
Priori SG, Blomström-Lundqvist C, Mazzanti A, et al. 2015 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death. Eur Heart J. 2015;36(41):2793-2867.
Yap YG, Camm AJ. Drug induced QT prolongation and torsades de pointes. Heart. 2003;89(11):1363-1372.
Roden DM. Long QT syndrome: reduced repolarization reserve and the genetic link. J Clin Invest. 2006;116(10):2597-2600.
Moss AJ, Zareba W, Hall WJ, et al. Effectiveness and limitations of beta-blocker therapy in congenital long-QT syndrome. Circulation. 2000;101(6):616-623.
Medication Comparisons
Compare medications used to treat Acquired Susceptibility To Long Qt Syndrome 1 C1843738. 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 26, 2026. · Read our editorial policy