A heart attack or myocardial infarction is the complete blockage of blood flow to a part of the heart, causing its muscle cells to die.
A network of blood vessels called coronary arteries continuously supply oxygenated blood to muscle cells of heart to keep them working properly.
However, due to bad lifestyle choices and stress, cholesterol and fats start building in these arteries reducing blood flow to the muscle cells. This buildup is called plaque. Plaque is the main culprit behind most heart attacks.
When plaque ruptures, a blood clot forms around it causing the artery to get completely blocked. The blood then cannot pass further to that part of the heart. Thus, due to lack of oxygen, the muscle cells in that part die. This condition is called a heart attack.
How Do Heart Rate Monitors Work?. Part of the series: Cardiology Information. Heart rate monitors work similarly to EKGs in that they measure the electrical activity produced by the heart. Find out how the leads on a heart rate monitor pick up electrical activity with information from a cardiologist in this free video on cardiology and the heart. Video Rating: / 5
Pulse oximeter: How it works and Interpretation / Pulse oximeter mechanism
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Dr. Stephen Kopecky, a cardiologist at Mayo Clinic, answers this question: Does aspirin help prevent stroke and heart attacks? This interview originally aired Sept. 15, 2018. Video Rating: / 5
Preventing heart disease is simple according to National Jewish Health Cardiologist Andrew Freeman, MD. Get his top four ways to prevent heart disease.
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TransMedics’ proprietary Organ Care System (OCS) is the first commercial and portable warm blood perfusion organ transport system. With the OCS, doctors are able to perform “living organ transplants,” where organs are kept warm and functioning in a controlled environment from the time they are recovered to the moment they are placed in the recipient’s body.
The human heart beats up to 3 billion times over an average lifespan. Learn about the anatomy of the heart and how this muscular organ provides life-giving oxygen throughout the body.
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Heart 101 | National Geographic
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The Heart Center at Nationwide Children’s Hospital is dedicated to the education of patients and families who require cardiac care. Learning how an anatomically sound or normal heart works can help families understand the more uncommon heart diagnoses children may have. Video Rating: / 5
Heartbeat and Pulse | Physiology | Biology | FuseSchool
Ever wonder what causes the thump-thump sound of your heartbeat?
It’s all to do with the valves. The sound of your heart beating can be attributed to your valves closing, and always in specific pairs.
Separating the atria from the ventricles are the tricuspid and bicuspid valves.The pulmonary valve and the aortic valve ensure that deoxygenated and oxygenated blood, respectively, leave the heart entirely without any backflow. This beautiful system sees that both the tricuspid and bicuspid valve are closed when the ventricles, both left and right, contract – this contraction forces blood out of the heart, through the pulmonary arteries and aorta.
The first thump that you can feel is the sound of the tricuspid and bicuspid valves closing simultaneously.
So during systole (the first half of your heartbeat) the tricuspid and bicuspid valves are closed, but the pulmonary and aortic valves are open. Once the ventricles relax, the pulmonary and aortic valves close, causing the second thump of a heartbeat. When the pulmonary and aortic valves are closed, the tricuspid and bicuspid valves automatically open.
During diastole, blood (both oxygenated and deoxygenated) fills into the heart.
The average heart rate for a young adult varies, depending on age, physical size, genetics, and activity. It is usually in the range of 60 – 100 heartbeats per minute. The fitter you are, the lower your resting heart rate is likely to be. An athlete may have a resting heart rate closer to 40 beats a minute.
After each heartbeat, a pressure wave passes along your arteries, which causes your arterial walls to bulge, and then contract. These pulses, as they are called, can be felt at various points throughout your body. A strong pulse can be felt at the top of your neck.
Although you cannot quantitatively measure the force of your pulse, you can do so for the overall force exerted against arterial walls by your blood – this is called blood pressure.
Usually your blood pressure is given as two numbers. These numbers represent the forces exerted during systole and diastole, known as systolic pressure and diastolic pressure. The systolic pressure is quoted before the diastolic.
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Get to know your body’s most important muscle — your heart — and learn how to take your own pulse!
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A heart attack happens when there is a sudden loss of blood flow to part of your heart muscle. It’s often believed a heart attack will cause you to collapse, but this is not always the case. The animation explains what a heart attack is, how it can be treated, and lifestyle changes that can reduce the risk of having another heart attack.
For more information visit: bhf.org.uk/heartattack
Heart rate monitors work similarly to EKGs in that they measure the electrical activity produced by the heart. Find out how the leads on a heart rate monitor pick up electrical activity with information from a cardiologist in this free video on cardiology and the heart. Video Rating: / 5
