RDI definition
Examples of RDI in a sentence
Other type-4 monitors calculate a patient’s respiratory disturbance index (RDI) on the basis of a nasal airflow signal (nasal pressure).3 Although type-4 portable monitors were developed as a means of screening patients with suspected OSAS, they are now also used for diagnostic purposes.
The hypopnea setting used by the Apnea Link airflow sensor to begin measurement of RDI is a decrease in airflow of greater than 50%.
Nonetheless, it is unlikely that the difference observed between the DI and the RDI (6.6 more events per hour were recorded for DI) (Figure 4) would lead to classification errors in terms of the decision to prescribe continuous positive airway pressure as a difference of just 6.6 events per hour would not influence the physician’s decision in this respect.
That is, because the Apnea Link device does not have an oxygen sensor, it is not able to detect certain hypopneas (low sensitivity) with the above setting, a factor which could, theoretically, adversely affect the RDI.
Sensitivity was 100% and specificity was 87.5% for a cutoff value of 10, which was associated with the largest area under the curve (0.95).6 In the present study, we did not compare the RDI to the AHI obtained by polysomnography.