The Ultimate Acoustic Stethoscope Review (page 5)
Stethoscope Frequency Response (Human Heart Power Spectra):
Human heart power spectra were recorded from the diaphragm using both stethoscope earpieces
attached to the microphone of our sound pressure meter. The control was the
microphone pressed directly against the chest wall. The sounds were analyzed for
sound pressure level in decibels as a function of frequency from 20 Hz to 20,000
Hz. All spectra shown
below were recorded on the same patient (volunteer 1). The results show that
most stethoscopes amplify sounds below 100 Hz and attenuate sounds above 200 Hz.
Model | Cardiac Frequency Response (Power Spectra) |
ADC Platinum Cardiology 615 | |
ADC Adscope Professional 603 | |
AllHeart Cardiology | |
DRG Puretone Traditional PT3 | |
Single Head Nursing Stethoscope | |
Littmann Cardiology I | |
Littmann Cardiology III | |
Littmann Master Classic II | |
Littmann Classic II SE | |
Omron Sprague Rappaport | |
Prestige Sprague Rappaport Stealth | |
Welch Allyn Tycos Elite |