The AV node then transmits the impulse down to the bundle of His no, not the bundle of hers, sorry ladies and then to two pathways called the right and left bundle branches. It then gets transmitted to the rest of the Ventricles through what are called Purkinje fibers. The wonder of a pulse!! This electrical conduction is what doctors are looking at when they are staring at the heart monitor.
Generally speaking, this impulse creates a squeeze that actually creates your pulse. A person could have a normal looking electrical conduction on the monitor and still have no pulse. This is one of the reasons why doctors still need to check pulses, and blood pressures, even if the person is hooked up to a heart monitor.
When someone is in cardiac arrest and has no pulse, depending on how the electrical conduction system is working, they might need to be shocked. There are numerous electrical rhythms that can present themselves in cardiac arrest. I will touch on the most common, and why shocking works. The most common heart rhythm just after someone goes into cardiac arrest is known as Ventricular fibrillation. When the SA node fails to create a beat, countless other cells within the heart attempt to create the beat instead.
It basically shocks the heart to make it stop beating completely , and hoping that when it starts beating again the arrhythmia will be corrected. It is kind of like "turning it off and turning it on again" to solve a computer problem.
When you're asystole, shocking it will do nothing because the problem lies elsewhere. It would be like trying to reset a computer when you have no power.
When the heart is in "ASYSTOLE" mode and you visualize a straight horizontal line on the screen it means there is no electrical signal passing through the ventricle which is the discharging chamber contracting to pump blood from the left side to systemic circulation.
There is no activity in the ventricle to fix so no point shocking the heart when there is no power on that is in "ASYSTOLIC" mode but when you visualize an so abnormal rythm such as seen in VF or in V-Fib then you shock the heart to jumpstart it back to a normal rythm. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Why is defibrillation in asystole "flat line" useless? Ask Question. Asked 7 years, 2 months ago. Active 1 year, 7 months ago. Viewed 54k times. The signal sent through the heart by the cardiac conduction system causes the heart to contract in an organized rhythm. This causes the body to become deprived of its normal blood supply, which is why the person experiencing an arrhythmia starts to feel faint.
Arrhythmias can have many causes, including heart disease, stress, substance abuse, or scarring from prior heart attacks.
Arrhythmias are dangerous because when your blood is not pumping properly, the result can be a heart attack, a stroke or even worse, sudden cardiac arrest. During defibrillation, the heart is stopped long enough to allow the contractions to reset. The large pulses of energy released by the defibrillator come from a built-in battery. This energy is sent down the two wires attached to the device which are capped off by paddles.
One paddle should be located above and left of the heart or on the lower right of the heart. The second paddle should be placed in front of the heart, which would be on top from the perspective of the person placing the pads. These placements will ensure the electricity reaches the part of the heart causing the fibrillation. Anyone can use a defibrillator on a person who is experiencing a cardiac episode. Defibrillators require no training as they instruct the user on every step.
The only knowledge the user needs to have is to remove the defibrillator from the wall in the public area where it is kept when they suspect someone of having a cardiac emergency. A defibrillator should not be used on a person who is suffering from a heart attack. During a heart attack, a person experiences pain and should still be able to respond.
During cardiac arrest, the person is not responding and may not be breathing. Children over age 8 can be treated with a standard AED.
For children ages 1 to 8, the American Heart Association recommends the pediatric attenuated pads that are offered separately with many AED units. Festival of Social Science — Aberdeen, Aberdeenshire. Edition: Available editions United Kingdom. Become an author Sign up as a reader Sign in.
Michael Vagg , Barwon Health. Out of my way, nurse! Medical myths Hospitals Pop culture.
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