Long Qt Syndrome 5 C1867904
Long QT Syndrome type 5 is an inherited heart rhythm disorder caused by genetic changes affecting the heart's electrical system. It may lead to fainting or irregular heartbeats during physical activity or emotional stress. Beta-blockers are often used to manage the condition.
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
Sudden cardiac arrest
Syncope
Palpitations
Seizure
Chest discomfort or palpitations
(cardiovascular)Significant symptoms that substantially affect daily functioning.
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 remain first-line therapy for LQT5 patients to reduce catecholamine-induced arrhythmias, though efficacy may be less pronounced compared to LQT1 and LQT2 subtypes.
Disease management and monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Sodium channel blocker therapy
Mexiletine or flecainide as adjunctive therapy to blunt late sodium current, potentially shortening the QT interval. Used particularly when beta-blockers alone provide inadequate protection.
When 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 5 C1867904?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
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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 20, 2026. · Read our editorial policy