Category: Asthma

Continuous Noninvasive Measurement of Pulsus Paradoxus Complements Medical Decision Making in Assessment of Acute Asthma Severity: Limitations

In reality, the complexities of optical plethysmography, along with their inherent noise, may preclude the utility of a simple relationship in a pulse oximeter that also displays PP. Filtering and straightforward signal-processing methods like least mean squares approximation and best uniform approximation will be needed to take this next step. Expert systems have appeared in […]

Continuous Noninvasive Measurement of Pulsus Paradoxus Complements Medical Decision Making in Assessment of Acute Asthma Severity: Discussion

The greater number of patients who had been unnecessarily admitted to the hospital may reflect the conservative approach that many physicians have in the management of asthma. The alternate disposition indicated by AT-PP supports its inclusion as an adjunct tool in patient assessment. Relapsing patients who had been discharged from the hospital are comparatively less […]

Continuous Noninvasive Measurement of Pulsus Paradoxus Complements Medical Decision Making in Assessment of Acute Asthma Severity: Oximeter Plethysmography Measures PP (Volunteer Subject)

Oximetry plethysmography also showed PP-like phenomena, which correspond to the BP measured PP events (Fig 4, top, A). A linear regression model describes a transfer function, which relates AT-PP in units of millimeters of Hg to a decrease in plethys-mographic amplitude (Fig 4, bottom, B). The slope of this relationship is roughly 0.01 V/mm Hg, […]