Long Qt Syndrome 2 C3150943
Long QT Syndrome type 2 is a common inherited heart condition where the heart's electrical recharging takes longer than normal. It increases risk of fast heart rhythms and sudden death, often treated with beta-blockers and an ICD in high-risk cases.
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
Torsades de pointes
Palpitations
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-blocker therapy
First-line pharmacological treatment using beta-adrenergic blockers to reduce heart rate and prevent arrhythmia triggers. Particularly important in LQT2 as auditory stimuli and sudden emotions are common triggers. Beta-blockers significantly reduce the risk of cardiac events.
Disease management and monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Additional treatment options
ICD implantation
Implantable cardioverter-defibrillator placement for high-risk patients or those with prior cardiac arrest. The device continuously monitors heart rhythm and delivers shocks when dangerous arrhythmias are detected.
procedureTrigger avoidance program
Comprehensive lifestyle modifications including avoidance of QT-prolonging medications, sudden auditory stimuli like alarm clocks, emotional stress, and sleep deprivation. Patients learn to recognize and manage situations that may precipitate arrhythmias.
lifestyleLeft cardiac sympathetic denervation
Minimally invasive surgical procedure to interrupt sympathetic nerve supply to the heart, reducing arrhythmia susceptibility. Reserved for patients who are refractory to beta-blocker therapy or ICD therapy.
surgicalRegular cardiac monitoring
Ongoing surveillance with periodic ECGs, Holter monitoring, and exercise stress testing to assess QT interval changes and arrhythmia burden. Helps guide treatment adjustments over time.
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 Long Qt Syndrome 2 C3150943?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalMedication Comparisons
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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