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Electrocardiography

What is Electrocardiography?

Electrocardiography (ECG or EKG from ) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.

In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).

During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node and then spreads throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.

Questions and answers on "Electrocardiography"

Hello I am a 50 yr old male that has some anxiety from time to time when this happens i take my blood pressure and it can read on the high side like 170/100 but it will come down shortly after pulse is around 100 or so when this happens recently I have started to notice pvcs went to emerg and EKG confirmed that at the time my BP was 155/88 heart rate 90 Dr said he was not concerned so I will follow up with familly Dr and have 24hr heart moniter is there any other suggestions that you might have thank you for your time. yes on the EKG PVCS did show up .
Brief Answer:
Further tests are highly suggested...

Detailed Answer:
Hi,

I have read your medical history and highly suggest to run further tests including:

- holter monitoring
- cardiac echo
- abdominal ultrasound
- complete blood profile
- bio-chemistry testing

to determine the right diagnosis....
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Sir, Good afternoon. Yesterday I received my ECG and ECO colour Doppler report where findings are Grade-1 Left Ventricular diastolic dysfunction. I am male and age is 47 . I have Blood pressure and take medicine for pressure control. How can I fully get rid of this problem.
Hello
You are having "Diastolic dysfunction " on the left ventricle .
Diastolic dysfunction is a condition characterized by abnormality in the fillin of the heart ( left ventricle ) during DIASTOLE .
It is caused by any condition or process that leads to stiffening of the left ventricle .The...
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I HAVE A LEFT BUNDLE BRANCH BLOCK ONLY FOUND IT WHEN I WAS HAVING A BABY NOW 27 YRS LATER FIND OUT I HAVE HEART MUMMER WITH A SLIGHT LEAKY VAL DOES ONE HAVE TO DO WITH THE OTHE MY EKG LOOKS CRAZY IM 52 55 YRS OLD WEIGH 130 I SAW A HEART DR I WORE A HEART MONTOR FOR 7 DAYS NOTHING ON IT HAD A STRESS TEST SAID COME BACK IN 2YRS I IM VERY FIT I DO YOGA SPINN CROSSFIT I REALLY WHAT A TUMMY TUCK CAN I OR IS IT A BIG DEAL
Brief Answer:
Looks like nothing very significant

Detailed Answer:
Left bundle branch can occur with or without the underlying cardiac problem. If it is incidently detected and work up has been fine. If your echo TMT and Holter are normal than I see no reason for concern nor will there be any...
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XRAY shows left anterior chest calcification, EkG reads sinus rhythm, low voltage in precordial leads,-Rsr(1) non diagnostic' anterior infart-age undetermined. My primary physician states no worries should I seek a doctor that specializes in what field??
Brief Answer:
Please upload the scanned EKG....

Detailed Answer:
Hi,

If you have not run any cardiac tests, then, I suggest to do:
- stress test
- holter monitoring
- cardiac echo

for further evaluation.

Can you please scan and upload the EKG (not the interpretation)? Based on that, I can give my...
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Woke up with no heartbeat
Brief Answer:
Further tests are needed...

Detailed Answer:
Hi,

If you experienced to wake up with no heartbeat, I'd suggest to go to ER immediately and to run further tests :
- EKG
- cardiac echo
- Holter monitoring
- abdominal ultrasound

to further evaluate your health status and identify any...
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On 1/21, as I sat at my computer at work, I began having pain in my left chest. I had no shortness of breath, no fever, no sweating. The pain did not radiate but steadily worsened over the next few hours (internal stabbing toward my left breast). The only pain relief was standing up/lying down. All tests were normal in the ER (EKG, cardiac enzymes), but because I am 55 and have had type 1 DM for 35 years (no complications), I was admitted for a radioactive stress test the next morning. The stress test results were normal, and I was discharged from the hospital in the afternoon of 1/23. I was told that I probably have shingles that hasn't yet erupted. It is now noon, on 1/25, there is no rash/itching/blisters on my left chest, but the discomfort continues. I'm at a loss and do not know what to do to make the cause of the pain go away. To my knowledge, I've not done anything to cause a pulled muscles(s). What do you suggest?
Brief Answer:
Intercostal pain

Detailed Answer:
Hi,

Thanks for your query.

I do not think the pain is due to heart condition, as pains due to heart do not vary on changing position . The test results also rule out the same.

Based on the description of the pain you had I suspect it to be due to...
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This afternoon I experienced numbness, tingling and weakness first in my left arm and then in my right. I was in a meeting so tried to ignore it. After a minute or so, it went away. I didn't think about it until later after my scheduled patients were done for the day. Now I am concerned. I am 59 years old. diabetic type 2. I'm thinking of contacting my doctor tomorrow. Would this be the best course of action?
Brief Answer:
ECG

Detailed Answer:
Hi,

Considering your history vascular disease risk exists. Hence an ECG would be simple and effective way to rule out myocardial infarction before any other tests to check if you had a mild heart attack. So please consider an ECG ( Also called EKG in some...
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good evening. I am male aged 35 years. I am on medication for high BP taking concor am5mg/day. Recently in the morning i experienced a light chest pain and upper back pain. Doctor ordered an ECG . It showed QRS(T) abnormality consistent with inferior infarct probably old. Immediately i took the report to doctor. He saw that and told nothing wrong in the ECG and dont worry about the result believe me. Next day i went to the cardiologist, he also told the same thing and did 2D echo which showed normal. Out of fear, i took another ECG on the next day at the same hospital which showed normal. Then can u please help me out why the initial ECG showed that result? Is it machine problem or i really got a heart attack previously? I did not experience any abnormalities previously
Brief Answer:
NO heart attack

Detailed Answer:
Dear friend,
Welcome to Health Care Magic

Obviously you did NOT have an attack…
If there was, it will be detected in ECHO, as wall motion anomaly / another ECG will not be normal...

Inferior wall ‘changes’ in ECG may at times occur from position of...
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I have been having for several months pain in the upper left muscle in my arm? Any suggestions as to what is causing my pain. The muscle is swollen and hard. I saw the heart doctor approximately 3 months ago and told him about the pain in my left arm. He send me to get at x-ray but nothing showed. I also did an ekg and eco gram for him and he said I did not have to do a stress test. I walk on a treadmill every day and do not get short of breath. Now I only walk 3 miles an hour and walk for about 35 to 40 minutes a day
Brief Answer:
Please refer below

Detailed Answer:
Hi
Thanks for your query.

As the muscle there is swollen and hard, I think that is the cause (inflammation of the muscle). It would not show up on XRay. A MRI scan may show up the problem.
As the ECG and ECHO are normal and no classic symptoms of...
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Ok, im a 40 year old female under going multiple testing with multiple specialists. I have a neurologist who is investigating over 20 brain lesions. 2 mri's4 months apart showed no change and im waiting on a lumber puncture. Mri of spine showed no lesions. Emg was normal. Ecg normal. I had a heart workup with EKG, Echo and Stress Test. Those were normal except doppler show impaired lv relaxation. I have a rheumatologist i see for grade 2 sacriolitis. I dont take anything for that. And an opthamologist i see for chronic uveitis. I take eyedrops for. Im having dizziness, lightheaded, chest pain that radiates to my jaw and arm and neck and i wake up numerous times with sleeping arms and legs. Noone has answers for me out of all my doctors. Im scared and dont know what to say or ask them, everytime i goto ER for chest pain they run bloodwork and ekg and say nothings wrong wirh my heart. What am i missing? What are doctors missing? Im scared its something serious other than ms.
Brief Answer:
spondyloarthritis

Detailed Answer:
Hi and thanks for the query

I am Dr. Alok, Rheumatologist and very pleased to be assisting you with your health questions today.

Dizziness, lightheaded, chest pain that radiates and wake up with sleeping arms and legs are very non specific, and if...
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