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An electrocardiogram (ECG), sometimes abbreviated EKG, is an important tool in detecting heart disease and pinpointing where difficulty lies when a problem is present. An electrocardiogram is a noninvasive test in which electrode patches are attached to your skin to measure electrical impulses given off by your heart. The electrical impulses, which cause your heart to contract and relax, are transmitted to an electrocardiograph machine. They typically are recorded in the form of waves, which can be displayed on graph paper or a monitor. Each wave represents the electrical current in a different area of your heart. A letter in the alphabet refers to each wave (deflection). the P wave represents the electrical current in the atria. The QRS waves (complexes) represent the electrical current travelling in the ventricles. the T wave represents the electrical recovery period of the ventricles. by interpreting the patterns of these waves, your doctor can diagnose several abnormal heart...

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The heart pumps about 70 times in a minute. This beating occurs at a regular interval. An irregularity in the rhythm is called Arrhythmia. The heart may beat irregularly, beat too fast or beat too slowly. Nearly everyone has felt their heart skip a beat, race or flutter inside their chest. Occasional heart palpitations are common and harmless, even though they're considered arrhythmias. They may just occur, or they may be produced by something that stimulates your heart, such as stress, tobacco, alcohol, caffeine, appetite suppressants or cold and cough medicines that contain caffeine or other stimulants. If you have an otherwise normal heart , occasional heart palpitations are rarely cause for alarm, and most don't require medical treatment. If they're bothersome, limiting or avoiding what prompted them may eliminate the problem. However many, mainly elderly experience recurrent or symptom-producing heart arrhythmias that may require treatment. With these arrhythmias ...

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Electrical impulses from your heart muscle (the myocardium) cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, known as natural pacemaker, located at the top of the right atrium. The SA node is sometimes called the heart's "natural pacemaker." When an electrical impulse is released from this natural pacemaker, it causes the atria to contract. The signal then passes through the atrioventricular (AV) node. The AV node checks the signal and sends it through the muscle fibers of the ventricles, causing them to contract. The SA node sends electrical impulses at a certain rate, but your heart rate may still change depending on physical demands, stress, or hormonal factors. ARTIFICIAL PACEMAKER When the natural pacemaker of the body (The SA node) goes wrong (due to shortage of blood in 95% cases), artificial pacemakers are implanted in many people. A pacemaker is an implantable device that helps regulate slow heartbeats (bradyca...

A heartbeat is a two part pumping action that takes about a second. As blood collects in the upper chambers (the right and left atria), the heart's natural pacemaker (the SA node), located at the top of the right atrium, sends out an electrical signal that causes the atria to contract. This contraction pushes blood through the tricuspid and mitral valves into the resting lower chambers (the right and left ventricles). This part of the two part pumping phase (the longer of the two). The second part of the pumping phase begins when the ventricles are full of blood. The electrical signals from the SA node travel along a pathway of cells to the ventricles, causing them to contract. This is called systole. As the tricuspid and mitral valves shut tight to prevent a back flow of blood, the pulmonary and aortic valves are pushed open. While blood is pushed from the right ventricle into the lungs to pick up oxygen, oxygen-rich blood flows from the left ventricle to the heart and other pa...

The heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little larger that the size of your fist. by the end of a long life, a person's may have beat (expanded and contracted) more than 3.5 billion times. In fact each day the average heart beats 100,000 times, pumping about 2,000 gallons (7,571 liters) of blood. The heart is located between our lungs in the middle of your chest, behind and slightly to the left of your breastbone (sternum). A double layered membrane called the pericardium surrounds your heart like a sac. the outer layer of the pericardium surrounds the roots of your heart's major blood vessels and is attached by ligaments to your spinal column, diaphragm, and other parts of your body. The inner layer of the pericardium is attached to the heart muscle . A coating of fluid separates the two layers of membrane, letting the heart move as it beats, yet still be attached to your body. Heart has 4 chambers. The upper chambers are called the left and r...