Prolonged Qt

QT interval in the electrocardiogram represents ventricular depolarization. Prolongation of QT occurs in delayed ventricular repolarization. This condition triggers tachycardia. Delayed ventricular repolarization occurs due to left ventricular hypertrophy, heart failure, hypertension, diabetes, etc. Lightheadedness, heart palpitations, etc., are the symptoms.

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What is the cause for prolonged QT interval?

Query: Hello doctor, My heart rate is 57. PR :145. QRSD : 76. QT : 398. QTc : 388. Axis: P : 6. QRS : 15. T : 14. 12 lead standard placement. Above is my ECG reading, but I have 155/95 BP and 47 bpm. Kindly advise.  Read Full »


Dr. Muhammad Zohaib Siddiq

Answer: Hello, Welcome to icliniq.com. QTc interval is prolonged. Please reply to the following questions so that I may guide you accordingly. Do you have a personal history of syncope or a family history of sudden death? What medicines are you taking for anything? Please have the following labs ...  Read Full »

Kindly interpret my ECG.

Query: Hi doctor, My ECG report showed left axis deviation, left anterior fascicular block and prolonged QT interval. Is this an abnormal ECG? What kind of health issue I am having? I am a 48 year old female. Also, I am diabetic since four years.  Read Full »


Dr. Rishu

Answer: Hi, Welcome to icliniq.com. Left ventricular hypertrophy is the most important cause of left axis deviation and left anterior fascicular block. Hypertension (high blood pressure) can very often result in left ventricular hypertrophy causing left axis deviation. QT prolongation can be because of many...  Read Full »

Can pneumonia cause prolonged QT waves?

Query: Hi doctor, I went to the emergency room with fast heartbeats. The doctor did an EKG and chest x-ray, and he said I had pneumonia. But, my QT was slightly prolonged. He repeated the EKG after a week later¬†and said it was fine. Should I be concerned about the prolonged QT? Can pneumonia have caused i...  Read Full »


Dr. Sagar Ramesh Makode

Answer: Hello, Welcome to icliniq.com. How much was your QT? Pneumonia will not cause QT prolongation. Since it has resolved, it was probably due to some reversible causes like electrolytes abnormalities like hypocalcemia, hypokalemia, etc. Many drugs also cause QT prolongation, so drugs need to be...  Read Full »

Will taking Flecainide for A-Fib cause prolonged QT?

Query: Hello doctor, I am 50 years with PAF. My first A-Fib was five years ago. I converted on my own. It went away for five years and in the year end, I started a keto diet and went into A-Fib twice and converted on my own. Started keto again and went into A-fib twice again and converted on my own. My ca...  Read Full »


Dr. Ilir Sharka

Answer: Hello, Welcome to icliniq.com. I passed carefully through your medical history and would like to explain that you are right when you worry about your current medications. Both Prozac and Flecainide increase QTc interval and may predispose for arrhythmia. I would recommend stop continuing their conco...  Read Full »

Can you please help me interpret the attached EKG?

Query: Hi doctor, I am a 27 year old female. I went to the ER a few years ago, and I was diagnosed with pleurisy and anxiety. I only recently saw my records from that day. My EKG showed sinus tachycardia. My heart rate was 110, which I guess was due to anxiety or trying to breathe with pleurisy. I was also...  Read Full »


Dr. Sagar Ramesh Makode

Answer: Hello, Welcome to icliniq.com. I have seen the ECG (attachment removed to protect patient identity). There are certain minor variations, which are quite commonly seen and considered as normal. So, there is nothing in your ECG, which is worrisome. Also, considering your age, the probability of any ca...  Read Full »

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