What is the relationship between ECG and heart sounds?

It is found that the end of the first peak of the ECG signal in a cardiac signal indicates the first heart sound(S1) and the end of following peak of the ECG indicates the second heart sound(S2). This phenomenon is due to the fact that the electrical event in cardiac activities takes place before the mechanical event.

Where is the dub heart sound heard in relationship to the ECG?

When the ventricles relax, the blood pressure drops below what is in the arteries and the semilunar valves close, producing the “dub” sound. These sounds can be correlated with the basic waveforms seen on an ECG (Figure 1). Figure 1.

At what point during an ECG would you expect to hear the dub sound?

The “lub” sound occurs during the early phase of ventricular contraction and is produced by closing of the atrioventricular valves, which prevents blood flow into the atria. When the ventricles relax, the blood pressure drops below what is in the artery and the semilunar valves close, producing the “dub” sound.

What is the difference between the lub and the dub of the heart?

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole. The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

What are abnormal heart sounds?

Abnormal heart sounds are called heart murmurs. These sounds can include rasping, whooshing, or blowing sounds. Heart murmurs can occur during different parts of your heartbeat. For instance, they can occur when the blood comes into the heart or when it leaves the heart.

What are S1 S2 S3 S4 heart sounds?

In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub. ‘ The third and fourth sounds may be heard in some healthy people, but can indicate impairment of the heart function. S1 and S2 are high-pitched and S3 and S4 are low-pitched sounds.

What is the normal heart sound?

A normal heartbeat has two sounds, a lub (sometimes called S1) and a dub (S2). These sounds are caused by the closing of valves inside your heart. If there are problems in your heart, there may be additional or abnormal sounds.

Is lub louder than dub?

S1 – The first heart sound (lub) can be heard the loudest at the mitral area. S2 – The second heart sound (dub). This is best heard at the base of the heart at the end of ventricular systole.

What kinds of conditions can produce abnormal heart sounds?

Abnormal heart sounds are called heart murmurs. These sounds can include rasping, whooshing, or blowing sounds….Other causes include:

• heart disease.
• high blood pressure.
• defects in the heart valves.
• congenital defects.
• metabolic disorders.
• emphysema.
• infections.
• stimulants.

What does S3 and S4 heart sounds indicate?

A S3 can be a normal finding in children, pregnant females and well-trained athletes; however, a S4 heart sound is almost always abnormal. CLINICAL PEARL: A S3 heart sound is often a sign of systolic heart failure, however it may sometimes be a normal finding.

What does S1 S2 S3 S4 mean?

In a healthy adult, the heart makes two sounds, commonly described as ‘lub’ and ‘dub. S1 and S2 are high-pitched and S3 and S4 are low-pitched sounds.

What makes the LUB sound on an ECG?

In this lab you will record the ECG from a subject and listen to the characteristic “lub-dub” heart sounds. The “lub” sound occurs during the early phase of ventricular contraction and is produced by closing of the atrioventricular valves, which prevents blood flow into the atria.

What causes the LUB sound in the heart?

The “lub” sound occurs during the early phase of ventricular contraction and is produced by closing of the atrioventricular valves, which prevents blood flow into the atria. When the ventricles relax, the blood pressure drops below what is in the artery and the semilunar valves close, producing the “dub” sound.

What makes the dub sound in the heart?

When the ventricles relax, the blood pressure drops below what is in the artery and the semilunar valves close, producing the “dub” sound. Human Heart – ECG and Heart Sounds – Background HH-2-1

What are the steps in interpreting an EKG strip?

Interpreting EKG Rhythm Strips The Five Step Approach The five-step approach, in order of application, includes analysis of the following: 1. Heart rate 2. Heart rhythm 3. P wave 4. PR interval 5. QRS complex Interpreting EKG Rhythm Strips Step 1 – Heart Rate