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- $Unique_ID{BRK01935}
- $Pretitle{}
- $Title{Life Saving Defibrillator}
- $Subject{Defibrillator electric shock heart fibrillation attack attacks
- contract contracts impulse impulses muscle muscles sinus node blood electrode
- electrodes EMT emergency medical technician technicians rhythm rhythms}
- $Volume{}
- $Log{
- Arrhythmias: Atrial Fibrillation*0001402.scf
- Arrhythmias: Ventricular Fibrillation*0001407.scf}
-
- Copyright (c) 1993 Tribune Media Services, Inc.
-
-
- Life Saving Defibrillator
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-
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-
- QUESTION: I saw a TV show about medical emergencies, where they stick
- something on the dead person's chest, and give him a shock. It doesn't always
- work, but after two or three jolts the patients is brought back to life. Can
- you tell me what the machine is called and how it works? I am doing this
- research for my school science project, and appreciate any help you can give
- me.
-
- ------------------------------------------------------------------------------
-
- ANSWER: The name of the machine is a "defibrillator" and it delivers an
- electric shock to the heart. Now I suppose I should describe "fibrillation"
- so you can understand how this works. In many cases of heart attack, there is
- a change in the way the heart contracts. Instead of regular electrical
- impulses going to the heart muscles from special cells located inside the
- heart (the sinus node), irregular, scattered electrical impulses rush all
- through the heart. Instead of contracting in an organized fashion, the fibers
- in heart muscles all contract at different moments as they are touched by
- these disorganized electrical impulses, so that the heart just quivers. And
- that's what fibrillation is, the involuntary, irregular contraction of the
- individual heart muscle fibers. When this happens the heart no longer pushes
- the blood through the four chambers of the heart and out to the body. There
- is no blood circulating in the body and no pulse can be felt. The patient
- looks dead. But not quite, for if the heart can be made to beat regularly
- once again, in an organized fashion, the patients life can be saved. Here
- comes the "defibrillator." It has a power supply, like an electrical battery,
- two electrodes or pads that can be placed on the patient's chest, and a
- monitor (like a TV set) that can show the pattern of the heart beat on the
- screen. When the EMT (emergency medical technician) or the emergency room
- doctor sees the pattern of fibrillation on the monitor, he (or she) can place
- the two pads on the chest over the heart, and send an electrical charge
- through the heart muscle. This interrupts the irregular electrical flow, and
- permits the heart to start a normal pattern of beating. Sometimes it takes
- more than one try to get the heart beat started and back to normal, and the
- patient needs much care once the heart starts to beat normally again.
- However, when used correctly and promptly, the defibrillator can save the
- lives of many of the 600,000 Americans who die of sudden cardiac death each
- year.
-
- ----------------
-
- The material contained here is "FOR INFORMATION ONLY" and should not replace
- the counsel and advice of your personal physician. Promptly consulting your
- doctor is the best path to a quick and successful resolution of any medical
- problem.
-