J Clin Monit Comput - Melodic algorithms for pulse oximetry to allow audible discrimination of abnormal systolic blood pressures.


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An anesthesiologist must remain vigilant of the patient's clinical status, incorporating many independent physiological measurements. Oxygen saturation and heart rate are represented by continuous audible tones generated by the pulse oximeter, a mandated monitoring device. Other important clinical parameters--notably blood pressure--lack any audible representation beyond arbitrarily-configured threshold alarms. Attempts to introduce further continuous audible tones have apparently foundered; the complexity and interaction of these tones have exceeded the ability of clinicians to interpret them. Instead, we manipulate the tonal and rhythmic structure of the accepted pulse oximeter tone pattern melodically. Three melodic algorithms were developed to apply tonal and rhythmic variations to the continuous pulse oximeter tone, dependent on the systolic blood pressure. The algorithms distort the original audible pattern minimally, to facilitate comprehension of both the underlying pattern and the applied variations. A panel of anesthesia practitioners (attending anesthesiologists, residents and nurse anesthetists) assessed these algorithms in characterizing perturbations in cardiopulmonary status. Twelve scenarios, incorporating combinations of oxygen desaturation, bradycardia, tachycardia, hypotension and hypertension, were tested. A rhythmic variation in which additional auditory information was conveyed only at halftime intervals, with every other "beat" of the pulse oximeter, was strongly favored. The respondents also strongly favored the use of musical chords over single tones. Given three algorithms of tones embedded in the pulse oximeter signal, anesthesiologists preferred a melodic tone to signal a significant change in blood pressure.

Resumo Limpo

anesthesiologist must remain vigil patient clinic status incorpor mani independ physiolog measur oxygen satur heart rate repres continu audibl tone generat puls oximet mandat monitor devic import clinic parametersnot blood pressurelack audibl represent beyond arbitrarilyconfigur threshold alarm attempt introduc continu audibl tone appar founder complex interact tone exceed abil clinician interpret instead manipul tonal rhythmic structur accept puls oximet tone pattern melod three melod algorithm develop appli tonal rhythmic variat continu puls oximet tone depend systol blood pressur algorithm distort origin audibl pattern minim facilit comprehens under pattern appli variat panel anesthesia practition attend anesthesiologist resid nurs anesthetist assess algorithm character perturb cardiopulmonari status twelv scenario incorpor combin oxygen desatur bradycardia tachycardia hypotens hypertens test rhythmic variat addit auditori inform convey halftim interv everi beat puls oximet strong favor respond also strong favor use music chord singl tone given three algorithm tone embed puls oximet signal anesthesiologist prefer melod tone signal signific chang blood pressur

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