Heart
Heart Sounds Introduction
Pediatrics: When To Refer
Heart Murmur
Normal Heart Sounds
First Heart Sounds
Second Heart Sounds
Extra Heart Sounds (S3 & S4)
Systolic Murmurs
Diastolic Murmurs
Complex Conditions
Congenital Abnormalities
Cardiac Conditions Assoc. with Sudden Death
Heart Sounds in Primary Care
Auscultation Repetition Training
Heart Sounds Guide
Lungs
Lung Sounds Introduction
Basic Lung Sounds
Intermediate Lung Sounds
Lung Sounds Guide
Intro To Lung Sounds
Blood Pressure
Taking Blood Pressure
Measuring Blood Pressure Procedure
Adult Case Studies Part I
Adult Case Studies Part II
High Blood Pressure in Children
Extras
Terms
Quizzes
Heart Sounds Guide
Lung Sounds Guide
Sonography Training (free)
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First Heart Sounds
First Heart Sound - Decreased Intensity
A decreased intensity first heart sound can be produced by various heart abnormalities, such as a viral infection of the heart called a cardiomyopathy.
Other conditions include a previous heart attack and decreased thyroid function.
The decreased intensity first heart sound is due to a decrease in the vigor of contraction of the left ventricle. See the anatomy tab.
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The recommended auscultation position for the stethoscope is the
Mitral
position. For this sound, use stethoscope's
Diaphragm
.
The recommended patient position is
Supine
Phonocardiogram
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.
Heart Animation
Lessons
First Heart Sound - Loud
First Heart Sound (Minimally Split)
First Heart Sound (Markedly Split)
First Heart Sound - Decreased Intensity
Fourth Heart Sound Plus First Heart Sound
First Heart Sound plus Aortic Ejection Click
Practice Drill
Listening Tips
A synopsis of important sound features and timing for this abnormality.
S1:
Reduced intensity.
CaseID
41
CourseID
23
CourseCaseOrder
4
ID
29