pulse oximeter

Variation in the pulse oximetry plethysmographic waveform: a surrogate for left atrial fluid responsiveness

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Variation in the pulse oximetry plethysmographic waveform: a surrogate for left atrial fluid responsiveness

  Intrathoracic pressure changes during ventilation. Widely appreciated, but less well understood, is how changes in intrathoracic pressure change preload and cardiac output. If you ask a resident what will happen when the ventilator gives a positive pressure breath, you will likely be told that the blood pressure will drop because increased intrathoracic pressure decreases […]

Upper airway obstruction can also cause plethysmographic waveform variation

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Upper airway obstruction can also cause plethysmographic waveform variation

  If you slow down the sweep speed of your monitor and examine the waveform of the pulse oximeter you will see the respiratory variation. Indeed, one could argue that this should be the default display. Particularly if a patient is paralyzed and ventilation is controlled, the variation with ventilation is related to left ventricular […]