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"

A friend related to me that if she feels intensely sad or joyful she has recently experienced falls where she feels paralyzed from the neck down that lasts about 30 seconds and then the paralysis slowly dissipates. Any ideas? She is about 37 yo and recently divorced.

doctor1 MD

Brief Answer:
Cataplexy is a possible cause

Detailed Answer:
I read your question carefully and I appreciate your concern about your friend.

That description is completely compatible with the description of cataplexy, which is a transitory loss of muscle tone, often triggered by strong emotions....

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I get heart throbs and feel week from time to time.

doctor1 MD

Brief Answer:
You need thorough check-up.

Detailed Answer:
Hello Giniar4114
Thanks for writing to XXXXXXX

Heart throb may be due to problems related to heart itself,hyperthyroidism etc.
You need proper clinical examination and investigations.

Investigations include routine hemogram,RBS,LFT,RFT,Lipid profile...

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My 49 yr old son is experiencing periodic, temporary blindness, anywhere from 5 min to up to 25 min. He's not seen a Dr. In yrs. He drinks bet 24 to 42 beers daily. What could this b a sign of & what tests to do?

doctor1 MD

Brief Answer:
Thorough ocular examination required.

Detailed Answer:
Welcome to HealthcareMagic.com,

The condition you have described here regarding your son is medically termed as Amaurosis Fugax.

Though these episodes of visual loss are transient but they are not to be ignored and warrant an...

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i am 31 years old addicted to alcohol,gutka & ciggrates however i have lessen the intake of the alcohol,stopped smoking & eating lesser tobacco since last 10 months as i am suffering from high BP. My HOMOCYSTENE LEVEL TEST comes above 50. i have undergone ECG,ECHO,TMT,BLOOD TEST,NCV test,THYROID TEST,KIDNEY & LIVER TEST,BRAIN ANGIOGRAPHY ETC all are normal reports.
right now i am taking BANTOP D,LODOZ 5,LONAZEP 0.25,LINAC Z & FRANXIT in the morning & BASIKOB G XXXXXXX CR 37.5,FRANXIT & LONAZEP 0.5 in the night. But always i caught thinking negative that i will die through heart attack or stroke & feels anxiety,dizziness & tensed regarding my health pls suggest how i can overcome from these symptons as it ios affecting my married & professional life.

Is i am suffering from some big disease i am in habit to visit to my doctor twice a week but my BP comes normal & he always say that you are alright....but i think whether i will live too long or not i take now 3 pegs whisky daily or one beer the same i have told to my doctor also he suggested to quit slowly all the times i feel that my heart beats faster or there is pain but ecg always come normal i always keep thinking that i will die soon through heart attack or will caught with a paralytic stroke or some major chronic disease please help me out doctor.

doctor1 MD

Hi,

Thanks for your query.

I am medical doctor, an associate in Department of Cardiology, working with an experienced Cardiologist. I would take this opportunity to answer on his behalf. As soon as a cardiologist is available, we would be getting your query answered by a cardiologist and would...

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Hi, I'm 51 female 5"2, 145lbs. I was very active (military) until 2 month ago when a nodule was found in my thryroid. Had a hemithyroidectomy 6 weeks ago and feel like a milion dollar, not taking any hormones and doing well, however, this week i started to have heart flutters and skipped pulses, totally different to my hyperthyroid nodule events, and they only occur when I'm sitting down, especially when I lean forward. They go away as soon as I getup, and soon after I lay down. they only occur sporadically when laying down, but are non stop when sitting. I'm also feeling a little "sort of crowded" since this started. Thanks

doctor1 MD

Hi,
Thanks for posting your query.
As you have hyperthyroid nodule and you have already undergone hemithyroidectomy, still there is possibility of hyperthyroid nodule persisting in your remaining thyroid nodule.
Excessive release of thyroid hormone may cause palpitation.
Another possibility of...

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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.

doctor1 MD

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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Should I see my cardiologist? My heart has been resting rate around 101-120. I have felt sort of an extra beat, this has gone on for 3 days and I have been hoping this would just go away, but it hasn't. My BP has been all over the place - Distolic high, then down to a normal. I have the worst dull headache from this. I have been taking aspirin to help with that. I don't want to go to the doctor if this is nothing to worry about. I have had to go in before for racing heart, and ended up in the ER, but a multitude of tests showed nothing wrong. However, I don't think previously the fast heart rate had lasted this long.

doctor1 MD

Hello
Thanks for posting the query.
Tachycardia i.e fast heart rate with irregular or extra beats could be more commonly pathological than normal or just anxiety related.
In your case since this has been the same for the past three days and is associated with blood pressure changes and headaches...

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Dear sir, iam XXXXXXX 27 age with 80 kg, past 3 months iam getting chest pain some time in left / right/ back side, they have taken ecg normal kindly say whether it will affects heart , and prevention

doctor1 MD


Hi XXXXXXX

Thank you for the query.

You haven't mentioned your height, so that I can know if your weight is appropriate to your height.

Chest pain may be a symptom of underlying heart problem. But since your ECG is normal, it is less likely to be heart related pathology. Do not panic. There are...

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Hi! My name is XXXXXXX I am 35 years old, female, 5'5", 147lbs. Unsure if this matters, but I have five children, carried all of them to full term. Health history includes high cholesterol, ldl came back at 167 two weeks ago, unsure of total number, but the rest of the blood work panal (full work up) came back normal. Also was told about 4 years ago I have a "leaky" heart valve, unsure of which one. My bp is normaly low 100s / 60s. I have had palpatations for last 15 years, randomly. Recently, for about the past month and a half, the palpatations have increased and I now experience them daily, several times a day. In addition, I keep experiencing pain in my chest, again several times a day. It is not extreme, it's not sharp at all...more like just a squished feeling if that makes sense? Uncomfortable but not horrible. I have difficulty breathing when I feel the pain--not in drawing breath in but rather it feels like I can't get enough, again if that makes sense. I also have times when my heart races, for no reason--yesterday was at 132bpm for about 20 minutes; normal at rest rate is around 70. All of these things I have experienced randomly over the past few years, but they are consistent here lately, daily and several times a day. I am exhausted constantly, perhaps not sleeping well because I wake at night frequently from getting overheated--sweating, which is a new thing for me. I have been dealing with dizzyness and daily headaches for the past few weeks also, again something that is new. I saw my dr on Friday, and she said because of my age she is not concerned, just eat a low-fat diet for the cholesterol. I only thought of it all being heart related because my dentist said something last week about my poor oral health combined with the pains in my chest-saying that the two could be linked? There is a vague family history of heart trouble. My Father has high bp and irregular heartbeat. His mother had high bp and died after having a stroke. All three of his sisters died of heart attack. No known history on my mothers side, and my own sister has no problems. With our insurance I am able to see a cardiologist without referral from my doctor, but I hate to take such a drastic step if it is not really necessary. I was hoping you could help me determine if I should look further into what I'm experiencing or trust my dr in her assessment that my age and my blood work all say I'm fine? Thank you so much for your time!!!

doctor1 MD

Hello Ms XXXXXXX
Thank you for your query.

Firstly, the fact that you are getting palpitations on a daily basis but randomly would suggest that there could be some arrhythmia of the heart. An ECG recording during the palpitation, or if the duration of the symptom is too short, a Holter recording...

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I have needle prick sensation on my left upper chest. Followed by light pressure.

doctor1 MD

Hi XXXXXXX
Thanks for writing in.
Your symptoms are not suggestive of heart disease but rather suggest either gastro-esophageal reflux disease, costochondritis or anxiety. However, given our history, I would be doubly reassured if we did have a normal ECG alongside. As of now, I would suggest...

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Recent questions on  Electrocardiography

doctor1 MD

I am George Daniel , 56 year old wants to take angiogram and to consult the Dr. George Thayil. Now I am working in Dubai,what is the procedures and how many days will take for angio +consultation.some days back I am went a hospital with chest pain.taken the ECG, ECG was perfectly ok, I am having diabetes, hypertension and cholesterol but blood sugar and BP under control Ldl cholesterol is above normal Still I am taking medicines. If I am getting the telephone number of Lourdes hospital that is well to contact.

doctor1 MD

Hello, Over the past 6 weeks I have been having heart palpitations, along with rapid heart rate (90-110 resting) and hand tremors. I am an otherwise healthy 29 yr old women. I saw my dr and he did ekg and labs. My blood work came back normal, and my ekg showed incomplete rt bundle branch block. I just saw a cardiologist today, and he ordered a holter monitor and echo. He doesn't seemed concerned with my symptoms. He listened to my heart rate sitting (in the 80's) then had me stand quickly and it jumped up past 100. He says this makes him think I may be lacking sodium?? He says I should eat more salty foods. I feel like I do, however, I watch my intake and aviod salt when possible. I really don't think I am lacking salt in my diet. Do you think the lack of over salted foods could cause these symtoms suddenly? Thank you...

doctor1 MD

Hello, Yesterday I had an incident where after I lifted weights my heart rate would not drop. Well after ten minutes I panicked and had to go to the hospital in an ambulance where my pulse was 140/150 sustained and started to drop after about 15 minutes (25 minutes overall). BP 140/90. I had a yogurt in the morning and a banana to eat, and lately I have been noticing that I have begun getting panicky or had rapid heartbeat after lifting only. Typically it goes away but yesterday was different. My EKG was fine and my BP dropped to 131/75 within a half hour. I also have had some heart palpitations lately, and have not felt as strong at the gym. Havent really had shortness of breath or chest pains, although I think during one palpitation I had a slight pain in left chest. I am 33 years old 160 and physically active. Do you have any idea why only lifting would cause panic, and then this episode with my heart. I have an appointment Monday with a cardiologist but wanted to touch base firs

doctor1 MD

I am 53 and have a nagging feeling of mild uneasiness on the left side of my upper chest slightly below shoulder at about 45 degrees from the shoulder. The ECG is normal but for the past few months I have a feeling of breathlessness on climbing. I am hypertensive of two years and after medication the blood pressure on different days varies between 75-82 / 117-135. Could you tell me the possible cause and advice. Mallickarjun Joshi

doctor1 MD

Hi. I am experiencing some strange synptoms. When i stand up to walk inget exteemely dizzy and my heart rate spikes. Im concerned. I feel thunping in my chest as well. Uploaded what my heart rate looks like using an app and it looks strange...

doctor1 MD

Kindly provide ECG reporting,

doctor1 MD

Hello, I have mild Hashimoto's and undifferentiated connective tissue disease. Also, I'm in a treatment period for anxiety and obsessive compulsive disorder . My heart rate is always a bit fast (85-95 resting HR, normal blood pressure). In last...

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