HealthTap Online Primary Care Doctors Accepting New Patients
Book a video visit
HealthTap
Telehealth
A member asked:

If someone has long qt syndrome is the conditions visible all the time on an ecg? or only during an episode?

A doctor has provided 1 answer

Not always: The qt interval is usually but not always prolonged. Certain drugs and electrolyte abnormalities may cause prolongation of the qt interval.

Answered 12/20/2019

5.3k views

Thank

Related Questions

A member asked:

Healthy heart, echos and echos etc. my QTC has always been 398/405 recently it's now always 420/430 on baseline resting ECG. Electrolytes normal, no long Qt syndrome. whys it higher now?

A doctor has provided 1 answer

A member asked:

I had an ecg attached to me and my Qtc was 415ms then I started running and when my HR hit 134 did an ecg and Qtc 457ms, is this because I didnt give my Qt enough time to adapt?

A doctor has provided 1 answer

A member asked:

If an ecg tracing was at 20mm/sec paper speed and then the same ecg waves were put onto a 25mm/sec ecg paper would the qt look falsely longer?

A doctor has provided 1 answer

A member asked:

Is it possible to pick up serious conditions that might cause fatal arrhythmia (Long QT etc) in a routine ECG/holter even if an episode is not caught?

A doctor has provided 1 answer

A member asked:

Can someone please help interpret ECG result printed on the strip I had from long ago. Long qt?

A doctor has provided 1 answer

Sponsored Content
HealthTap Medical Group does not endorse products or services. Sponsored content revenues support our mission to make health information free and accessible to all.Learn more

People also searched for:

If someone had congenital long qt syndrome. Would it of shown on 10 different ecgs, 24 hour holter, stress treadmill ecg?
One ECG (out of 5) showed long qt intervals. Does this mean I have lqt syndrome? R/o hypocalcemia.
Would over 10 12-lead ecgs and 4 48 hour ecgs rule out long qt syndromes and other channelopathies?
Does midodrine cause long qt syndrome in normal people? My ECG was fine just wondered if it can cause it ever in me. Male 22.
With repeated ECG, holter monitors, ECHO, cardiac MRI and stress tests would long QT syndrome be obvious to diagnose?

Telemedicine

Primary Care
Manage Your Conditions
Women's Health
Children's Health
Men's Health
Senior Health
Wellness, Prevention & Lifestyle
Sexual Health
Mental & Behavioral Health
Travel Medicine
Urgent Care
Ask your question
Didn't find what you're looking for?

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.

Ask your question

More of what we treat

Allergies
Antibiotics
Asthma
High Blood Pressure
Prescriptions
Type 2 Diabetes
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.
HealthTap
HIPAA logo
HIPAASecure
Soc 2 Type 2 logo
SOC 2 Type 2Certified
JCAHO Accredited
JCAHOAccredited
Member App

Download HealthTap

Video visit and message your doctor

Member App QR Code
Play Store Member LinkApp Store Member Link

Questions?

+1 (888) 828-0841support@healthtap.com
LinkedInTwitter
HomeTermsPrivacyCookiesDMCAHealth TopicsDoctors DirectoryDoctor Q&A by Specialty
Copyright 2026 HealthTap, Inc.