音乐不会扰乱起搏器节律
Walking in rhythm is safe, even with earbuds: studyWASHINGTON (Reuters) - Portable media players such as iPods are unlikely to interfere with heart pacemakers, a U.S. Food and Drug Administration researcher reported on Thursday.
His tests of a variety of iPods showed they did not produce enough of an electromagnetic field to interfere with the devices.
FDA researcher Howard Bassen and colleagues set up a complex experiment using a saline-filled bag to simulate the human body and a coil sensor designed to pick up electromagnetic emissions.
They measured the magnetic fields produced by four different iPod models: a fourth-generation iPod and an iPod with video, and an iPod nano and an iPod shuffle. They also measured the voltages delivered to the inside of the pacemaker by the magnetic fields from the iPods.
All their measurements indicated the iPods could not affect cardiac pacemakers, they reported in the journal BioMedical Engineering OnLine.
\"We measured magnetic field emissions with a 3-coil sensor
placed within 1 cm (half an inch) of the surface of the player. Highly localized fields were observed (only existing in a one square cm area),\" they wrote.
\"Based on the observations of our in-vitro study we conclude that no interference effects can occur in pacemakers exposed to the iPods we tested,\" they concluded.
Two reports had suggested otherwise. Last year cardiologists operated an iPod during a patient's examination, and reported in the journal Heart Rhythm that they had seen interference with the pacemaker.
And last May, a study presented by a 17-year-old high school student to the Heart Rhythm Society annual meeting in Denver caused a stir when he said he detected electrical interference half of the time when the iPod was held 2 inches from the patient's chest for 5 to 10 seconds.
The FDA researchers did not examine any portable music devices other than iPods, which are made by Apple Inc..
华盛顿（路透社）周四美国食品药品管理局的研究者报告，便携式音乐播放器——比如iPods——不会干扰心脏起搏器。
对多种iPod的研究显示，它们不会产生足够强的电磁场以干扰心脏起搏器。
FDA研究者Howard Bassen及其同事开展了一项复杂的实验，采用充满生理盐水的袋子模拟人体，并设计了一个线圈传感器感知电磁场发射。
他们测量了四种不同iPod模型产生的电磁场：一个第四代iPod、一个视频播放iPod、一个nano系列的iPod、一个shuffle系列iPod。他们还测量了iPod产生的电磁场对体内起搏器产生的电压。
他们在BioMedical Engineering OnLine 杂志上报道，所有的测量显示iPod不会干扰心脏起搏器。
“我们采用一个3线圈传感器测量了播放器表面1厘米以内（半英寸）的磁场发射。测量范围非常小（仅仅1平方厘米的区域）。”他们写道。
“基于我们的体外研究，我们得出结论，暴露于我们检测的iPod不会对起搏器产生干扰”他们说。
有两项报告得出了不同的结论。去年Heart Rhythm杂志上报道，有心血管医生在患者检查时使用iPod，发现iPod对起搏器有干扰。
去年5月，一个17岁的在校学生在丹佛的心律学年会上报道的一项研究引起了震动，他报道iPod在患者胸部2英寸使用5-10秒钟有一半的时间可以检测到电干扰。
FDA的 研究者并没有检测除苹果公司的iPod以外的其它便携式音乐播放器。
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