Elliot Kim
A thrill heart sound is a palpable vibration caused by turbulent blood flow through the heart valves or near the heart. This phenomenon, known as a heart murmur, can be detected through cardiac auscultation, where a clinician uses a stethoscope to listen to the heart sounds. Murmurs can vary in pitch, duration, and timing, and are graded on a scale of 1 to 6 based on intensity, with 1 being the lowest intensity and 6 being the loudest. They can be systolic, diastolic, or continuous, depending on when they occur within the cardiac cycle. Some murmurs are benign, while others can indicate cardiac or valvular pathologies, such as heart diseases or defects.
| Characteristics | Values |
|---|---|
| Definition | Additional sounds generated by turbulent blood flow in the heart and blood vessels |
| Cause | Narrowing of one or more valves (stenosis), backflow of blood through a leaky valve (regurgitation), or the presence of abnormal passages through which blood flows in or near the heart |
| Types | Systolic, diastolic, or continuous |
| Detection | Palpation, which can detect by touch when such turbulence causes the vibrations called cardiac thrill |
| Intensity | Graded on a scale of 1 to 6 for systolic murmurs and 1 to 4 for diastolic murmurs |
| Pitch | Low, medium, or high |
| Quality | Blowing, harsh, rumbling, or musical |
| Location | Over the second intercostal space at the left sternal border |
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What You'll Learn
- Heart murmurs are unique heart sounds caused by turbulent blood flow
- Murmurs are additional sounds that may be systolic, diastolic or continuous
- A cardiac thrill can be felt by touch when turbulence causes vibrations
- A stethoscope is used to listen to heart sounds and detect abnormalities
- Murmurs are graded by intensity and described by location and when they occur
Heart murmurs are unique heart sounds caused by turbulent blood flow
A heart murmur is a blowing, whooshing, or rasping sound heard during a heartbeat. They are more prolonged than normal heart sounds and may be systolic, diastolic, or continuous. Systolic murmurs are the most common type in children and are heard during or after the first heart sound, ending before or during the second heart sound. Diastolic murmurs are usually abnormal and may be early, mid, or late diastolic. Continuous murmurs are heard during both systole and diastole and occur when there is a constant shunt between a high and low-pressure blood vessel.
The intensity of a murmur can vary from barely audible to very loud, and they are graded on a scale of 1 to 6, with 1 being the lowest intensity and 6 being the loudest. A palpable thrill is typically associated with louder murmurs, which can be felt by touch and may be described as a vibration. The major way healthcare providers examine the heart is through heart auscultation, which involves listening to the heart sounds with a stethoscope. During auscultation, the patient is typically lying on their back with their head elevated at a slight angle, while the clinician listens to the heart sounds at various positions on the chest.
Heart murmurs can be indicative of cardiac and valvular pathologies, such as heart diseases or defects. For example, a ventricular septal defect may present as a holosystolic murmur heard at the left lower sternal border, which is associated with a palpable thrill. Murmurs can also be benign, primarily due to physiologic conditions outside the heart, or they may be innocent murmurs common in children that change intensity with body position. Overall, heart murmurs are unique sounds that provide valuable information about the functioning of the heart and can aid in the detection of potential abnormalities.
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Murmurs are additional sounds that may be systolic, diastolic or continuous
A heart murmur is a blowing, whooshing, or rasping sound heard during a heartbeat. The sound is caused by turbulent blood flow through the heart valves or near the heart. Murmurs are additional sounds that may be systolic, diastolic, or continuous.
Systolic murmurs are the most common type of murmur in children. They are classified based on their timing within systole. Systolic ejection murmurs (SEM) are caused by turbulent blood flow due to obstruction across the semilunar valves, outflow tracts, or arteries. The murmur is heard shortly after S1 (the first heart sound) and its intensity increases and then decreases as more blood flows across the obstruction. Innocent murmurs are the most common cause of SEM. Other causes include stenotic lesions, such as aortic and pulmonary stenosis, or relative pulmonary stenosis due to increased flow from an ASD. Midsystolic murmurs begin just after S1 and end before P2 (the second heart sound), while holosystolic murmurs start at the beginning of S1 and continue to S2. Decrescendo systolic murmurs are a subtype of holosystolic murmur that may be heard in patients with small ventricular septal defects (VSDs). In the latter part of systole, the small VSD may close, causing the murmur to become inaudible.
Diastolic murmurs are usually abnormal and may be early, mid, or late diastolic. Early diastolic murmurs immediately follow S2 and are caused by aortic and pulmonary regurgitation. Mid-diastolic murmurs are due to increased flow through the mitral or tricuspid valves, while late diastolic murmurs are caused by pathological narrowing of the AV valves, such as rheumatic mitral stenosis.
Continuous murmurs are heard during both systole and diastole and occur when there is a constant shunt between a high and low-pressure blood vessel. Examples include patent ductus arteriosus and systemic arterio-venous fistulas. Continuous murmurs can also occur in surgically placed shunts, such as a BT shunt between the aorta and the pulmonary artery.
The timing of a murmur is crucial for an accurate diagnosis. Murmurs are graded by intensity and described by their location and when they occur within the cardiac cycle. Systolic murmurs are graded on a scale of 1 to 6, while diastolic murmurs are graded on a scale of 1 to 4. The pitch of a murmur relates to the velocity of blood at the site of origin and can be high, medium, or low. High-pitched murmurs are associated with high-velocity blood flow, while low-pitched murmurs indicate lower velocity.
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A cardiac thrill can be felt by touch when turbulence causes vibrations
A thrill is a vibration that can be felt by touch. In the context of the heart, a thrill is a palpable vibration that can be felt by placing a hand on the chest. This is known as a cardiac thrill or a thrill heart sound.
A cardiac thrill is caused by turbulent blood flow through the heart valves or blood vessels. This turbulence creates vibrations that can be felt as a throbbing or pulsating sensation under the hand or fingers. It is often associated with heart murmurs, which are the abnormal sounds produced by turbulent blood flow. Heart murmurs can be heard using a stethoscope and may have distinct characteristics such as pitch, duration, and timing.
Healthcare professionals can use palpation, which is the act of feeling with the hands, to detect cardiac thrills. During a cardiac examination, a clinician may place their hand on the left side of the sternum to feel for any vibrations or parasternal heave. This is often done in conjunction with heart auscultation, which involves listening to the heart sounds using a stethoscope.
The intensity of a cardiac thrill can vary. It is graded on a scale from I to VI, with higher grades indicating louder and more palpable thrills. A thrill is typically felt as a vibration without an audible sound, but in higher grades, it may be accompanied by audible heart sounds or murmurs.
Cardiac thrills and heart murmurs can be important indicators of cardiac and valvular pathologies. They may suggest the presence of heart diseases, defects, or abnormalities. For example, a ventricular septal defect may present with a holosystolic murmur and an associated palpable thrill that increases with isometric handgrip.
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A stethoscope is used to listen to heart sounds and detect abnormalities
A stethoscope is a medical device used to listen to the sounds produced by the heart and detect any abnormalities. This process is known as cardiac auscultation. During auscultation, the clinician focuses on each phase of the cardiac cycle, noting heart sounds and murmurs. Heart sounds are brief, transient sounds produced by the opening and closure of heart valves and are divided into systolic and diastolic sounds. Murmurs, on the other hand, are additional sounds caused by turbulent blood flow in the heart and blood vessels. They may be systolic, diastolic, or continuous.
The stethoscope is placed on the patient's chest, back, and abdominal area to listen to heart sounds. The diaphragm of the stethoscope is used for higher-frequency sounds, while the bell is better suited for lower-frequency sounds. The intensity of heart sounds and murmurs is graded on a scale, with systolic murmurs ranging from grades 1 to 6 and diastolic murmurs from 1 to 4. The rule of thumb is that sound radiates in the direction of blood flow.
Heart murmurs have distinct characteristics that differentiate them from normal heart sounds. They may have a unique pitch, duration, and timing. For example, a ventricular septal defect (VSD) will present as a holosystolic murmur, which can be heard at the left lower sternal border and is associated with a palpable thrill. The intensity of a heart murmur can vary depending on body position, and certain maneuvers can be used to increase or decrease the intensity. For instance, maneuvers such as standing, squatting, or isometric handgrip can affect the intensity of a murmur.
A thrill is a palpable vibration that can be felt when placing a hand on the left side of the sternum. It is associated with certain types of heart murmurs and can indicate the presence of a cardiac or valvular pathology. A thrill may be graded as part of the murmur grading system, with grades III and IV indicating a palpable thrill without and with loud murmur intensity, respectively.
In summary, a stethoscope is an essential tool for listening to heart sounds and detecting abnormalities, such as heart murmurs and thrills. Cardiac auscultation requires experience and the ability to distinguish subtle differences in pitch, timing, and other characteristics of heart sounds.
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Murmurs are graded by intensity and described by location and when they occur
A heart murmur is a blowing, whooshing, or rasping sound heard during a heartbeat. They are produced by blood flow turbulence and are more prolonged than normal heart sounds. Murmurs are graded by intensity, described by location, and classified by when they occur within the cardiac cycle.
Healthcare providers grade heart murmurs depending on how loud the murmur sounds through a stethoscope. The grading is done on a scale of 1 to 6, with 1 being the quietest and barely audible, while 6 is the strongest and most intense. When a murmur is more noticeable, it can be felt with the palm of the hand over the heart, which is called a "thrill", and indicates a grade of 4 or higher.
The location of a murmur is described using the thoracic cage position where they are auscultated, with the patient typically lying on their back (supine) with their head at a slight upward angle. The clinician focuses attention sequentially on each phase of the cardiac cycle, noting each heart sound and murmur. Murmurs can be systolic, diastolic, or continuous. Systolic murmurs occur when the heart muscle contracts at the beginning of or during a heartbeat, while diastolic murmurs occur when the heart muscle relaxes between beats. Continuous murmurs create sound throughout both parts of the heartbeat.
The intensity of a murmur can be affected by certain patient maneuvers such as squatting, standing, or holding their breath while bearing down or gripping something with their hands. Squatting increases the intensity of aortic stenosis, mitral stenosis, aortic regurgitation, and mitral regurgitation, while standing abruptly increases the intensity of murmurs in hypertrophic obstructive cardiomyopathy and mitral valve prolapse.
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Frequently asked questions
A thrill heart sound is a palpable vibration caused by turbulence when blood flows across a heart valve or blood vessel.
A thrill heart sound is detected by touch, through palpation, or by listening to the heart with a stethoscope.
Thrill heart sounds are graded by intensity, from I (lowest intensity) to VI (loudest intensity).
Thrill heart sounds can be systolic, diastolic, or continuous. Systolic murmurs are the most common type in children.
