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Cardiac Auscultation and Intracardiac Tumors
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Cardiac Auscultation and Intracardiac Tumors
Cardiac Auscultation and Intracardiac Tumors
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1
Question
What physiological events produce the first heart sound (S1) during the cardiac cycle?
Page 1
Answer
S1 is the sound of mitral and tricuspid valve closure. It occurs at the end of atrial systole and the start of isovolumetric contraction.
2
Question
What causes the second heart sound (S2) and when does it occur in the cardiac cycle?
Page 1
Answer
S2 is the sound of aortic and pulmonary valve closure. It occurs at the end of ventricular systole as ventricles relax (isovolumetric relaxation).
3
Question
What is the proportion of ventricular filling that occurs during diastole and atrial systole respectively?
Page 1
Answer
Diastole provides 70% of ventricular filling. Atrial systole contributes the remaining 30% of ventricular filling.
4
Question
What auscultatory sign is produced when the mitral and tricuspid valves open abruptly during rapid ventricular filling?
Page 2
Answer
An opening snap occurs with abrupt opening of mitral and tricuspid valves. A loud opening snap suggests mitral or tricuspid stenosis.
5
Question
How does atrial fibrillation affect ventricular filling and systemic output?
Page 1
Answer
Atrial fibrillation reduces atrial contraction, decreasing ventricular filling. This lowers cardiac output and can cause hypotension.
6
Question
Define isovolumetric contraction and explain its significance in the cardiac cycle.
Page 1
Answer
Isovolumetric contraction is ventricular contraction with all valves closed. It generates pressure without volume change before ejection begins.
7
Question
What is the clinical meaning of an ejection click during systole?
Page 1
Answer
An ejection click is the sound of aortic or pulmonary valve opening during ventricular systole. It marks valve opening at the start of ejection.
8
Question
What volume of blood is typically ejected into the aorta and pulmonary artery during normal ventricular systole?
Page 1
Answer
Approximately 80 ml of blood is pumped to the aorta and pulmonary artery during normal ventricular systole.
9
Question
What heart sound is associated with rapid ventricular filling and what does its presence indicate in young versus older patients?
Page 2
Answer
S3 is the ventricular gallop occurring during rapid ventricular filling. It is physiological in patients under 35 years and pathological in older adults (e.g., heart failure).
10
Question
What is the timing and clinical significance of the fourth heart sound (S4)?
Page 2
Answer
S4 is an atrial gallop occurring during atrial systole. It usually indicates pathology and reflects a stiff ventricle or decreased compliance.
11
Question
What is diastasis during diastole and how does it affect cardiac activity?
Page 2
Answer
Diastasis is the mid-diastolic phase when ventricular filling slows markedly. It represents the period of least cardiac activity before atrial systole.
12
Question
Fill in the blank: The time lag between aortic and pulmonic valve closure that produces physiologic splitting of S2 is ______ milliseconds.
Page 2
Answer
The time lag is 30 milliseconds.
13
Question
What auscultatory finding becomes more prominent on inspiration and why does this occur?
Page 2
Answer
Splitting of the second heart sound (S2) becomes more prominent on inspiration. Inspiration increases venous return to the right heart, delaying pulmonic valve closure.
14
Question
Which stethoscope chestpiece (diaphragm or bell) is best for hearing high-pitched heart sounds, and which sounds are those?
Page 3
Answer
The diaphragm is best for high-pitched heart sounds. It transmits S1, S2, and opening snaps clearly.
15
Question
Which stethoscope chestpiece is recommended for low-pitched heart sounds and which specific sounds are low-pitched?
Page 3
Answer
The bell is best for low-pitched heart sounds. It transmits S3 and S4 and low-pitched diastolic murmurs.
16
Question
What is the tumor plop sound and with which cardiac tumor is it classically associated?
Page 3
Answer
Tumor plop is an early diastolic sound produced when an intracardiac tumor strikes valve leaflets. It is classically associated with atrial myxoma.
17
Question
Name the standard auscultation location for the aortic area on the chest wall.
Page 3
Answer
Aortic area: right of the sternum at the second intercostal space.
18
Question
Name the standard auscultation location for the pulmonic area on the chest wall.
Page 3
Answer
Pulmonic area: left of the sternum at the second intercostal space.
19
Question
Where is Erb's point located for auscultation and what is its clinical utility?
Page 3
Answer
Erb's point is left of the sternum at the third intercostal space. It is useful for appreciating splitting of S2.
20
Question
Where should a clinician auscultate to assess the tricuspid valve area?
Page 3
Answer
Tricuspid area: left of the sternum at the fourth intercostal space.
21
Question
Where is the mitral (apex) area located for cardiac auscultation?
Page 3
Answer
Mitral area: left of the sternum at the fifth intercostal space in the midclavicular line.
22
Question
Describe the pathophysiological mechanism that produces the tumor plop in atrial myxoma.
Page 3
Answer
A pedunculated tumor swings in the left atrial lumen and strikes the open mitral valve leaflet. The impact produces the tumor plop sound.
23
Question
List three cardinal clinical features of atrial myxoma that present on history.
Page 4
Answer
Effort intolerance, dyspnea on exertion, and platypnea (worse sitting, better lying).
24
Question
What is platypnea in the context of atrial myxoma and what positional change relieves it?
Page 4
Answer
Platypnea is breathlessness while sitting that resolves on lying down. Lying down moves the tumor away from the valve reducing obstruction.
25
Question
Explain two mechanisms by which atrial myxoma can cause transient ischemic attacks.
Page 4
Answer
Tumor causes endothelial damage leading to platelet plugs and embolism. Additionally, tumor cell embolisation can occur.
26
Question
What typical auscultatory findings may be present on examination of a patient with atrial myxoma?
Page 4
Answer
Findings include pallor, a tumor plop sound, and a mid-diastolic murmur; long-term damage may produce mitral regurgitation.
27
Question
Outline the typical clinical course leading from atrial myxoma impact to neurological manifestations.
Page 4
Answer
Repeated tumor impacts damage mitral endothelium, causing platelet plaque formation and possible dislodgement; embolization disseminates tumor/platelet material causing neurological events.
28
Question
Which imaging modalities are recommended to investigate suspected atrial myxoma?
Page 4
Answer
Transthoracic echocardiography (TTE) and transesophageal echocardiography (TEE) are recommended for investigation.
29
Question
What is the definitive management for atrial myxoma?
Page 4
Answer
Definitive treatment is surgical resection via cardiothoracic vascular surgery.
30
Question
Define papillary elastoma and name the tissue of origin.
Page 4
Answer
Papillary elastoma is a tumor arising from heart valve tissue. It originates from valvular endocardial structures.