By Polly E. Parsons MD, Jeanine P. Wiener-Kronish MD
(Hanley & Belfus) Univ. of Vermont, Burlington. accomplished textual content offers the knowledge wanted for educating rounds, scientific events, and oral tests. gains concise solutions, tips, bulleted lists for fast evaluation, and a complete index. query and resolution layout. past version: c1998. Softcover.
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Additional resources for Critical Care Secrets: Questions and Answers Reveal the Secrets to Effective Critical Care
A known preexisting severe acidosis can be partially compensated for by hyperventilation, but sodium bicarbonate may still need to be administered. The underlying cause of the acidosis should be diagnosed and corrected. n Hyperkalemia: This condition is encountered in patients with renal insufficiency, diabetes, and profound acidosis. Peaked T waves and a widening of the QRS complex, with the electrical activity eventually deteriorating to a sinus-wave pattern, herald hyperkalemia. Treatment includes the administration of calcium chloride, sodium bicarbonate, insulin, and glucose.
Pulse oximetry is accurate within 2% to 3% of the true O2Hb levels as measured in vitro with multiwavelength oximeters. S. Food and Drug Administration requires manufacturers to demonstrate that their instruments confirm to this degree of accuracy in human subjects at between 70% and 100% oxygen saturation. Because the principle of measurement is based on a ratio of absorbance ratios, no calibration of the instrument by the user is needed or possible. 3. What factors interfere with pulse oximetry?
3. What factors interfere with pulse oximetry? , motion artifact). Optical interference may be introduced by extraneous light from fluorescent sources or infrared surgical navigation systems. 33 34 CHAPTER 5 PULSE OXIMETRY, CAPNOGRAPHY, AND BLOOD GAS ANALYSIS Intravenous dyes (methylene blue, indocyanine green) and nail polishes (especially green, blue, or black) absorb at the wavelengths used by the oximeter and can produce artificially low measurements. Contamination from venous pulsations caused by dependent venous pooling or valvular insufficiency may also cause low readings.
Critical Care Secrets: Questions and Answers Reveal the Secrets to Effective Critical Care by Polly E. Parsons MD, Jeanine P. Wiener-Kronish MD