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This phrase "your heart is beating like a drum," is called a simile. It means your heart is beating very fast, excitedly. Something has excited you very much. Often used romantically.
defribrillator
You can feel their pulse through arteries in their wrist or neck. A stethoscope can be used to listen to the heart beat. Ultrasound can produce an image of the beating heart.
Once the heart muscle stops beating, it starts to decompose very quickly. A person can be clinically dead, but still have a beating heart. Sometimes hearts are kept beating after death to sae them for transplant surgeries.
Electric shocks can be given in certain types of heart-attacks. When the heart has trouble beating it gets what is called fibrillation. The electric device that stops that is called a defibrillator because it shocks the heart into beating normally.
An automated external defibrillator (AED) should be used when the patient has cardiac arrest. This is when the heart suddenly stops beating; the AED will distribute a shock to the heart to try to get it beating again.
It's in use 24 hrs a day as long as your heart is beating.
An cadaverous organ donor can either be a "heart-beating donor" (aka, brain dead) or a "non-heart beating donor". Those in the first category have suffered a severe head injury, meaning they will never regain consciousness or recover, but their heart is still pumping blood around their body. Whereas those in the other group have suffered some event which has stopped their heart - e.g a sudden cardiac arrest. Those in the "non-heart beating donor" category are never used for heart transplants, since their heart has been the cause of their death; their heart does not work. Only those in the "heart-beating donor" category are used for heart transplants; in these donors, the heart does not stop beating until it is removed from their body - the heart is not "dead" as such, but the donor is brain dead so has no use for a functioning heart. And just because the heart ceases to beat when outside of the body does not mean it is "dead". Possibly your question should be "how long do you get between harvesting a heart for transplant until it becomes unusable?", since using a "dead" heart for a transplant would be utterly pointless. However, if that was your question, you get around 4-5 hours.
Those people are brain dead and are on life support machines which keep the heart and organs working. If that machine is turned off the persons heart would stop beating. So effectively they are dead but a machine keeps the heart going. If the person has signed the donor register and the next of kin agree then that heart is used to save someone elses life. This is of great comfort to the donors next of kin that they know their death was not in vain.
The technique of catheter ablation (meaning tube-guided removal) is used to interrupt the abnormal contractions in the heart, allowing normal heart beating to resume.
Cardioversion is used to stop this abnormal beating so that the heart can begin normal rhythm and pump more efficiently.
Doppler scanning-- A procedure in which ultrasound images are used to watch a moving structure such as the flow of blood or the beating of the heart.