Mizutani A R, Ozaki G, Benumof J L
Department of Anesthesiology, University of California, San Diego, Medical Center 92103.
J Clin Monit. 1990 Jan;6(1):61-4. doi: 10.1007/BF02832184.
We constructed and tested an inexpensive (less than $50) FM wireless, acoustically shielded, precordial radiostethoscope that enables the anesthetist to follow the heart tones and breath sounds of the patient regardless of the anesthetist's location in the operating room. We compared our acoustically shielded device with a similar, but acoustically unshielded, commercially available device. We found the sound quality of our radiostethoscope to be superior to that of the commercial device; the signal-to-noise ratio of our device was 7.6 for heart tones and 8.4 for breath sounds, whereas the commercial device had a signal-to-noise ratio of 2.7 and 3.9 for heart tones and breath sounds, respectively. Our device offers all of the advantages of a radiostethoscope and has the added advantages of low cost and high fidelity.
我们构建并测试了一种价格低廉（不到50美元）的调频无线、隔音的胸前区无线电听诊器，该听诊器能让麻醉师无论身处手术室何处，都能听到患者的心音和呼吸音。我们将我们的隔音设备与一款类似的、但未隔音的市售设备进行了比较。我们发现我们的无线电听诊器的音质优于市售设备；我们设备的心音信噪比为7.6，呼吸音信噪比为8.4，而市售设备的心音和呼吸音信噪比分别为2.7和3.9。我们的设备具备无线电听诊器的所有优点，还具有低成本和高保真度的额外优势。
