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Doctor insights on: How Does An Eeg Work

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How does an EEG work?

How does an EEG work?

Electrical recording: In the same way an ekg measures electrical activity from the heart, an EEG measures activity from the brain. Electrodes are placed on the scalp and the patient lies quietly while brainwaves are recorded. Sometimes, hyperventilation and/or flashing lights are used to evoke different responses. It is important to relax, as electrical activity from muscle can swamp the signals from the brain. ...Read more

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Dr. Jeffrey Cohen
404 doctors shared insights

Eeg (Definition)

An electroencephaolgram (eeg) is a test that uses wires on the scalp to measure electrical activity produced by the brain. It is used to assess cerebral activity, and can be very helpful in the diagnosis and treatment of seizures as well ...Read more


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How does an ophthalmoscope work?

How does an ophthalmoscope work?

Light: An ophthalmoscope sends a beam of light, properly focused, to the back of the eye illuminating those structures which can be viewed by your ophthalmolgist with a clever mirror arrangement. It depends upon the same light principal that causes 'red eye' in your pictures. ...Read more

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How exactly does straterra work to help a person focus?

How exactly does straterra work to help a person focus?

Strattera (atomoxetine) increases: Neurotransmitters, chemicals including norepinephrine and (somewhat) dopamine, that conduct messages from one nerve cell to the other and thus improves the function in certain parts of the brain responsible for focus of attention, holding thoughts in working memory long enough to work with them, and screening out distactions that may interfere with attention. ...Read more

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How does an inhaler work?

How does an inhaler work?

Different types: Some inhalers are designed for "rescue". They directly effect the bronchioles to dilate. Others are cortisone types which are "controllers" . They minimize your lungs reactions to whatever triggers the attack. ...Read more

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What does an XL event on an EEG mean? How does it differ from an XL spike?

What does an XL event on an EEG mean? How does it differ from an XL spike?

No physical symptoms: An XL spike on EEG is basically just a sudden brief burst of electrical activity that doesn't actually create the outward signs of a seizure. "Events" may be similar, but more of a subclinical seizure, evidence for seizure activity on the EEG but no outward physical sign of seizure. ...Read more

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How does will an endoscopy procedure work?

How does will an endoscopy procedure work?

Upper/lower?: Upper=stomach endoscopy, usually no prep except not eating/drinking x 4 hrs, then sedation via iv, and doc puts scope through mouth and throat into stomach, looks and biopsies if needed. Lower=colonoscopy, prep by flushing system with strong prep laxatives, then sedation via iv, and scope enters via anus and looks at 5 feet of colon, biopsies etc. ...Read more

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How does the EEG test work?

How does the EEG test work?

Records brain: Electrical activity occurs thruout the body, and like an electrocardiogram recording heart activity, small discs are taped to specific areas of the scalp, and pickup underlying electrical impulses from brain activity. The rhythms vary during sleep and waking, and are compared to normal expectations. Diffuse slowing may correlate with diffuse problems, and paroxysmal activity may indicate seizure. ...Read more

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How effectively does sam-e complete work for an anti-depressant?

How effectively does sam-e complete work for an anti-depressant?

Pretty decent: I have had multiple patients who really were opposed to SSRIs and other prescription medications use Sam-e with pretty good results. I would not recommend this for treatment of a major depression but for the blues that come with life, it is safe and effective. ...Read more

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How does an echocardiogram function?

How does an echocardiogram function?

Doppler effect: The echocardiogram utilizes ultrasound and a principle called the doppler effect. Doppler effect means sound waves are reflected at different velocities and this information is electronically transformed to allow visualization of structural details and provide information about blood flow velocities. ...Read more

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How does an echo function?

How does an echo function?

Bounces sound waves: An echocardiogram is simply an ultrasound. Like any other ultrasound, including those used by fishing boats, the fundamental principle is to send high-frequency sound waves into the target (heart) and measure the time it takes to return to the transducer (echo). The resulting picture is a measure of the distance traveled and the physical properties of the material it passed through. ...Read more

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How does caffeine affect an EEG scan?

How does caffeine affect an EEG scan?

Very minimal: Caffeine is a stimulant, and if you are too awake, you may have trouble relaxing, and a desired sleep tracing may be difficult to obtain, BUT otherwise little if any profound effect. ...Read more

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How much time does an EEG test take?

About an hour : A routine eeg takes half an hour, but there is additional time needed to put on and take down the electrodes. That being said, sometimes we will run studies for longer time periods (days at a time) in hopes of capturing a rare event. ...Read more

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How does a pacemaker work?

How does a pacemaker work?

Artificial pacemaker: Artificial (implantable) pacemakers are mostly regulated by a sensor that recognizes motion. It's similar to the sensor that changes your phone/ipads display from portrait to landscape, based on the direction of the device. There are other sensors, such as ones that measure the density of blood in the heart and chest motion (simulating breathing). Get your routine pacemaker maintenance checks. ...Read more

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How long does an angiogram take to perform?

How long does an angiogram take to perform?

Variiable: It all depends on which vessels and the problems detected. Some vessels can be difficult to enter. ...Read more

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How does a defibrillator work?

How does a defibrillator work?

Defibrillator : An external defibrillator can be automatic or manned either way either a computer or the operator can determine the patient is having a lethal arrhythmia and electrical energy is delivered to the chest wall and the rhythm can be terminated. ...Read more

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How does a holter monitor work? And what conditions can it detect?

How does a holter monitor work? And what conditions can it detect?

Holter monitor: Worn continuously for 24-96 hours it records heart rhythm. Used to detect arrythmia. ...Read more

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Can you tell me how is it possible for an EEG to measure brain activity?

Can you tell me how is it possible for an EEG to measure brain activity?

EEG: EEG measures voltage fluctuations resulting from ionic current flows within the brain neurons. ...Read more

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How does a biopsy work?

How does a biopsy work?

Laboratory: First you obtain a sample of the tissue or fluid . Second to send it to the pathology laboratory for identification, benign or malignant, classification if malignant, then for referral for treatment, even if not malignant. ...Read more

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How will i know what does an evaluation for bipolar disorder involve?

How will i know what does an evaluation for bipolar disorder involve?

Getting to know you: I would gather a very detailed history - way back to childhood all through time until now and even ask lots about family members. I'd ask for a description of your highs and lows - details of what they include, how long they last and how they feel & cycle. If there are calm times too. I might even witness a mood episode or two. So far, i know of no quick test. I'm concerned if a faster DX is made. ...Read more