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The interrupter technique, the simplest method for measuring airflow resistance (Rint or Rocc) is particularly valuable under field conditions.
Features • The Rocc Flow shutter (PN# FPFTA.SHUT1) can be purchased as an option for the Pocket-Spirometers (Pocket-Spiro® USB100 or Pocket-Spiro® BT100) • Rapid, non-invasive inspiratory and expiratory measurements. • An alternative to spirometry for pre-school age children. • Easy to use with neonates and geriatric patients. • Lightweight and portable (operating from internal rechargeable batteries or mains) • Pre and post medication comparisons with predicted values. • Broncho-challenge software as an option • Results printed directly to Bluetooth (Wireless) compatible Printer using PDA with Microsoft CE operating system • Patient Data Interface (PDI) Software or PDI Lite Software compatible (can be used on both PC and/or PDA systems) .
The Rocc option is compatible with all the MEC Pocket-Spiro® products. This mean that you can use the Rocc option with your Pocket-Spiro® USB100 (with a USB cable ) or BT100 (Bluetooth wireless). The Pocket-Spiro®BT100 is compatible with the PC (windows XP or 2000) but also with your PDA (Windows CE). Both systems may cohabit and have synchronisation software to maintain their database up to date.
The PDI Lite (for PDA systems) and PDI (for PC) database may contain more than 65000 patient files. The Database are “open” and are available for exportation (Microsoft Access database).
The Rocc option can be added at the back of the Pocket-Spiro®. The shutter is closed during 100ms at the begin of the exhalation and is totally imperceptible for the patient.
The PDI with Rocc software (For PC) The Rocc software is part of the PDI software. It is very easy to use and allows the visualisation of each signals (flow, volume, mouth pressure, etc..)
Each measurement is visible after the recording and can be edited (manual slope adjustement) if necessary or deleted from the statistics (artefacts). A slow vital capacity and a forced vital capacity may be performed at the end of the test. The software may export the raw data in Excell sheets for furter study or rechearch. The final reports are printed in Acrobat PDF or Microsoft Word format and may be exported to a central database using one of the 10 available protocols (XML, HL7, ASCII, GDT, etc..)
The PDI Lite with Rocc software (For PDA) The PDI lite is the “state of the art” lung function software all in the palm of your hand ! It contains the new 2005 ATS/ERS software recommendations and will perform all the spirometry and even more. The PDI lite let you store the forced and slow spirometry (FVC, FEV1, SVC, etc..) the Rocc, Bronchochallenge , Pimax, Pemax, etc.. At the end of the day you can synchronise your PDA with your PC (using the PDI software) to print or export the results. You may also want to directly print from your PDA on a compatible Bluetooth printer with no need of PC.
The Rocc technic
An optimal Pm(t) curve should display a sharp increase in pressure immediately following occlusion , a series of high frequency oscillations and a smooth increase in pressure. Rint,L measurements are obtained by linear back extrapolation of two points from the curve, 30 and 70 ms post-occlusion (t30 and t70) to an arbitrary point, 15 ms post- occlusion, at which total valve closure is thought to have occurred (tocclusion).
Mouth pressure measurements are taken pre-occlusion (P0)
and at tocclusion (Pint).
The ratio of this measurement to the expiratory flow at the mouth at the time of occlusion gives the Rint measurement [3]
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