Your heart may not function normally if the heart valves are not working properly, as this can interfere with blood flow in the heart. Usually, when the electrical impulse moves through the heart, the heart contracts at rest, about 60 to 100 times per minute, depending on a person`s age. AV block (heart block) is one of the two main causes of low heart rate (bradycardia). There are different degrees, with third-degree heart block being the heaviest and usually requiring a pacemaker. This is the measurement of pressure in the arteries. It plays an important role in how your heart delivers fresh blood to all your blood vessels. In order for blood to flow through your body fast enough, it needs to be under pressure. This is created by the relationship between three things: the muscles of the ventricles then contract, and blood is pumped through the lungs and aortic valves into the main arteries. Your heart is in the middle of your chest, near your lungs. It has four hollow heart chambers surrounded by muscles and other heart tissue. The chambers are separated by heart valves, which ensures that blood continues to flow in the right direction. Learn more about heart valves in the bloodstream. PVC, which occurs only once in a while, is common in people of all ages, but more common in the elderly.

PVC can occur in people without heart disease, but it is more common in people with some type of heart disease. PVC rarely causes problems unless it occurs again and again over a longer period of time. In such cases, they can lead to PVC-induced cardiomyopathy or weakening of the heart muscle by too much PVC. Most of the time, this can disappear once the PVC is processed. In order for your heart to pump regularly, it needs electrical signals that are sent to the heart muscle and tell it when to contract and relax. In this way, the electrical system of the heart causes the heart muscle to contract and sends blood either to the organs of the body (via the left ventricle) or to the lungs (via the right ventricle). Most of the time, PVC that only occurs once in a while does not require processing. If you have another problem with your heart that is being treated, your PVC may decrease. For example, you can take medication to lower your blood pressure or lower your heart rate. This can reduce how often you have PVC. The body`s oxygen-poor blood enters your heart through two large veins called the upper and lower vena cava. Blood enters the right atrium of the heart and is pumped into your right ventricle, which in turn pumps blood into your lungs.

The coronary veins carry oxygen-depleted blood from the heart muscles into the right atrium so that it can be pumped into the lungs. These include: After all, your arteries can become so narrow that they can`t supply enough blood to your heart. This can cause angina pectoris – pain or discomfort in the chest, arm, neck, abdomen or jaw. Some hormones cause the kidneys to remove more water and salt from the blood. The decrease in blood volume and salt causes your blood vessels to relax and lowers your blood pressure. Atrial natriuretic peptide is a hormone produced and released by heart cells when the pressure in the atria is increased. Two different types of cells in your heart allow the electrical signal to control your heart rate: from the sinus node, the electrical signal travels through the right atrium and the left atrium (the two upper chambers of the heart), causing the atria to contract and their blood load to push into the right and left ventricles (the two lower chambers of the heart). The electrical signal then passes through the AV node to the ventricles, where it in turn causes the ventricles to contract. The thyroid gland releases thyroid hormones that increase heart rate. Problems with your thyroid gland can lead to heart problems such as an irregular heartbeat. Too much thyroid hormone can make the heart beat faster.

Too few thyroid hormones can slow your heart rate. The electrical heart signal controls the heart rate in two ways. First, since each electrical pulse generates a heartbeat, the number of electrical pulses determines the heart rate. And second, when the electrical signal “spreads” through the heart, it triggers the contraction of the heart muscle in the right order, coordinating every heartbeat and ensuring that the heart is functioning as efficiently as possible. Some conditions can damage your heart muscle, make it weak, and not be able to pump as efficiently as before: contracting the atria and ventricles causes a heartbeat to beat. When your heart beats, it emits a “lub-DUB” sound. You may have heard this if you listened with a stethoscope or with your ear on your chest. The atria and ventricles work together, taking turns contracting and relaxing to pump blood into your heart. Your heart`s electrical system is the source of energy that makes this possible.

1. The SA node determines the rate and rhythm of your heart rate. Like other muscles in the body, your heart needs blood to receive oxygen and nutrients. Your coronary arteries supply your heart with blood. These arteries branch out of the aorta, allowing oxygen-rich blood to be delivered to both your heart and the rest of your body. A network of specialized muscle cells is located in the walls of the heart. These muscle cells send signals to the rest of the heart muscle, leading to contraction. This group of muscle cells is called the cardiac conduction system. Since the pulse moves very slowly through the AV node, there is a pause in electrical activity at the ECG, which is called the PR interval. (The PR interval is illustrated on the ECG in Figure 3.) This “pause” in action allows the atria to contract completely and drain their blood into the ventricles before the ventricles contract.

At rest, a normal heart beats about 50 to 99 times per minute. Exercise, emotions, fever and certain medications can make your heart beat faster, sometimes at more than 100 beats per minute. 2. The SA node triggers a pulse. The impulse spreads through the walls of the right and left atria, causing them to contract. This forces blood into the ventricles. Figure 5: This figure shows the electrical impulse that propagates over the right and left ventricles, causing these chambers to contract. When the electrical signal passes through the ventricles, it creates the “QRS complex” on the ECG. The QRS complex is indicated by the solid red line on the ECG on the left. If your coronary arteries are narrowed or blocked, the blood supply to your heart will be affected.

This is the most common form of heart disease, known as coronary artery disease (sometimes called coronary artery disease or ischemic heart disease). Look at the second hand or set the timer on your stopwatch or phone and count the number of beats you feel in 30 seconds. Double that number to find out your heart rate or pulse for a minute. Problems anywhere on this route can lead to ECG (and heart rate) abnormalities. .