By Kenneth M. Setton
Read Online or Download Catalan Domination of Athens, 1311-88 (Variorum revised editions; M5) PDF
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Additional info for Catalan Domination of Athens, 1311-88 (Variorum revised editions; M5)
Sample text
Rochmis P, Blackburn H: Exercise tests: a survey of procedures, safety, and litigation experience in approximately 170,000 tests, JAMA 217:10611066, 1971. 2. Myers J, Voodi L, Umann T, Froelicher VF: A survey of exercise testing: methods, utilization, interpretation, and safety in the VAHCS, J Cardiopulm Rehabil 20(4):251-258, 2000. 3. Gibbons L et al: The safety of maximal exercise testing, Circulation 80:846-852, 1989. 4. Yang JC, Wesley RC, Froelicher VF: Ventricular tachycardia during routine treadmill testing, Arch Intern Med 151:349-353, 1991.
There is a need for consumer awareness in these areas because most manufacturers do not specify how the use of such procedures modifies the ECG. Both filtering and signal averaging can, in fact, distort the ECG signal. Averaging techniques are nevertheless attractive because they can produce a clean tracing when the raw data are noisy. However, the clean-looking ECG signal produced may not be a true representation of the waveform and in fact may be dangerously misleading. Also, the instruments that make computer ST-segment measurements are not entirely reliable because they are based on imperfect algorithms.
The disposable electrodes have the advantages of quick application and no need for cleansing for reuse. A disposable electrode that has an abrasive center spun by an applicator after the electrode is attached to the skin (Quickprep) is available from Quinton Instrument Co. This approach does not require skin preparation. A clever feature of the applicator is a built-in impedance meter that stops it from spinning when the skin impedance has been appropriately lowered. Buffer amplifiers or digitizers carried by the patient are no longer advantageous.
