Pulse

Your heart beats all day.

Each beat sends blood through you. This creates a little thump. You can feel this thump in many places.

You can feel it in your neck. You can feel it in your wrist. It is also in your arm and your leg. You can even find it on your foot.

This thump is called a pulse. It is a way to check your heart. It helps you stay well.

Your heart beats to pump blood through your body. Each beat sends a wave of pressure through your arteries. This wave makes the artery walls expand and contract. We call this rhythmic movement a pulse.

You can feel a pulse in many places. Many people check their pulse at the wrist. This is called the radial artery.

You can also feel it in your neck. This is the carotid artery. Doctors check the pulse in many other spots too. They might check your inner arm, your groin, or even your foot.

We measure the pulse rate in beats per minute. This is often called BPM. A normal pulse has a steady rhythm. Sometimes, a pulse might feel weak or very strong. A weak pulse might mean low blood flow. A very strong pulse might happen during exercise or fever.

Measuring the pulse is a quick way to estimate how fast your heart is beating.

Your pulse is a rhythmic movement you can feel in your body. It happens because your heart beats in a cycle. Each heartbeat sends a pressure wave through your arteries. This wave causes the artery walls to expand and then contract.

This movement is a way to feel the pressure from your heart. A trained observer can use the pulse to estimate systolic blood pressure. This is the pressure during the heart's contraction. The pressure between beats is called diastolic pressure. This part of the cycle cannot be felt by touch.

There are many places where you can feel this pulse. Doctors often check the radial artery at the wrist. They might also check the carotid artery in the neck. For very young children, they often use the brachial artery in the upper arm.

You can also find pulses in the groin or behind the knee. Other spots include the ankle and the top of the foot. Each of these locations uses a different artery to carry blood. Finding these spots helps doctors understand how blood moves through the body.

People have studied the pulse for a very long time. Claudius Galen was perhaps the first person to describe it. Scientists have found many ways to measure it since then. One tool used for measuring is called a sphygmograph. In intensive care units, doctors have used special catheters since the 1970s. These are small tubes connected to a machine called a transducer. This helps them see very detailed information about the pulse.

We usually measure the pulse rate in beats per minute, or BPM. While the pulse and heartbeat are related, they are not exactly the same. There is often a small delay called the pulse transit time. This is the time it takes for the wave to travel. A healthy pulse rate is usually close to the actual heart rate. Sometimes a person has a pulse deficit. This means the pulse rate is lower than the heart rate. This can happen during certain heart conditions like atrial fibrillation.

Understanding the pulse can tell us much about health. A normal pulse has a steady rhythm and force. A weak pulse might mean low blood flow. A very strong or bounding pulse might happen during a fever. The shape of the pulse can also change. Some pulses rise and fall very quickly. Others might rise and fall slowly. By looking at these patterns, doctors can learn how the heart and arteries are working together.

The pulse is the rhythmic expansion and contraction of an artery. It occurs in response to the cardiac cycle, which is the sequence of a heartbeat. This movement is a vital sign that provides information about a person's cardiovascular health. By feeling the pulse, a trained observer can estimate systolic blood pressure. Systole is the phase where the heart contracts and pushes blood out. The pressure between these beats is called diastolic pressure. Diastolic pressure is non-palpable, meaning it cannot be felt by touch.

To understand the mechanism, we must look at how pressure waves move through the body. During systole, the heart generates pressure waves that travel through the arterial system. These waves move the walls of the arteries. For a pulse to be palpable, the arterial boundaries must be pliable and compliant. This means the vessels must be able to stretch and move easily. When these conditions are met, a detectable pressure wave is created. In intensive care settings, doctors often use an invasive technique to see these waves. Since the 1970s, they have used arterial catheters connected to a transducer and an oscilloscope.

There are many different sites where a pulse can be detected. These are divided into central pulses and peripheral pulses. Central pulses include the carotid artery in the neck and the femoral artery in the groin. Peripheral pulses are found further from the heart. Common sites include the radial artery at the wrist and the ulnar artery. In infants and very young children, the brachial artery in the upper arm is often used. Other locations include the popliteal artery behind the knee and the dorsalis pedis artery on the foot.

Medical professionals categorize the pulse by its rate, rhythm, volume, and force. The rate is measured in beats per minute, or BPM. While the pulse and heartbeat are related, they are not identical. There is a delay called the pulse transit time between the heartbeat and the pulse. A pulse deficit occurs when there is a difference between the heart rate and the pulse rate. This is often seen in conditions like atrial fibrillation. Rhythm refers to how regular the beats are. An irregular rhythm might be caused by ectopic beats or atrial flutter.

Volume and force provide deeper details about the state of the circulatory system. Volume, also called amplitude, is the degree of arterial expansion. A hypokinetic pulse is weak and may signify low cardiac output. Conversely, a hyperkinetic pulse is bounding and signifies high pulse pressure. This can happen during a fever or due to increased cardiac output. Force is a rough indication of systolic blood pressure. Tension is determined by the mean arterial blood pressure. A high tension pulse feels rigid even between the actual beats.

History shows that humans have studied these rhythms for centuries. Claudius Galen was perhaps the first physiologist to describe the pulse. Since his time, technology has advanced significantly. We can now use pulse oximetry to observe blood indirectly. This technology uses light absorbances to look at hemoglobin. It compares oxygenated hemoglobin to deoxygenated hemoglobin using mathematical ratios. This allows for a non-invasive way to monitor blood oxygen levels.

Specific pulse patterns can also signal serious medical conditions. For example, pulsus alternans is a pattern of strong and weak pulses. This is an ominous sign of progressive systolic heart failure. Another pattern is the dicrotic pulse, which has two beats per cardiac cycle. This can be caused by reflected waves from the lower extremities. There is also pulsus paradoxus, where some beats cannot be detected during inspiration. This can indicate a condition called cardiac tamponade. Understanding these complex patterns helps doctors diagnose specific issues within the heart and vessels.