(EL-5100) Hemodynamic Calculations

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An extract from ANESTHESIA and ANALGESIA, Vol 59, No 7, July 1980, page 519

   In a recent article … displayed a very useful program for simplifying the repetitive calculation of hemodynamic variables in the operating room by using a hand-held programmable calculator. They used a TI-59 calculator, Texas Instruments, Dallas, Tx. As an alternative, I would like to mention a less expensive calculator which we have found useful, namely the SHARP EL-5100, Sharp Electronics Corporation, Paramus, NJ. Although lacking the programming size and data storage, the facility of magnetic tape program insertion and the ability to perform iterative loops of the TI-59, the EL-5100 costs only $90 to $100 vs $210 to $300. In addition it has a LCD display with a 1000-hour battery life, is compact, has efficient program editing and correcting features, and is programmed by algebraic statements rather than machine instructions. Also, memory is preserved during power off.
   To use this calculator with the format suggested … insert the following program in the AER mode:
     f(ABCDEFG) = B ÷ A, 1 Exp 3 × B ÷ AC, (D-F) × B ÷ AC × 13.6, (D-G) × A ÷ B, (E-F) × A ÷ B
   Program insertion requires about 1 minute.
   Next in the COMP mode, the calculator will interrogate the user for the values of A to G: A, body surface area (m2); B, cardiac output (L/min); C, pulse rate; D, mean systemic blood pressure (torr); E, mean pulmonary arterial pressure (torr); F, mean pulmonary capillary wedge pressure (torr); and G, mean right atrial pressure (torr). If body surface area is unknown, height (cm)^0.725 × weight (kg)^0.425 × 7.184 × 10^-3 may be entered and the calculator will enter the calculated body surface area into memory A.
   The calculator will then show five consecutive answers: ANS 1 = cardiac index (L/min/m²); ANS 2 = stroke volume index (ml/beat/m²); ANS 3 = left ventricular stroke work index (g-m/beat/m²), ANS 4 = systemic vascular resistance (resistance units), and ANS 5 = pulmonary vascular resistance (resistance units).
          Nathan Leon Pace, MD
          Assistant Professor
          Department of Anesthesiology
          University of Utah College of Medicine
          Salt Lake City, Utah 84132

reference:
The hemodynamic tracking system: a method of
data management and guide for cardiovascular
therapy. Anesth Analg 59:169-174, 1980

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