End tidal carbon dioxide measurement with an electro acoustic sensor has recently been demonstrated. The sensor consists of an acoustic resonator coupled to a low cost electro acoustic element. The aim of this study was to verify if ambient temperature variation would affect the measurements. By simultaneous measurements with a reference sensor, the electro acoustic capnograph was tested on sub...

patients. The six episodes of detachment all occurred with the use of a flexible plastic version of the sensor. This problem seems to have been solved with the use of a new cloth sensor. Conversely, the CapnomaskTM was removed on numerous occasions in three patients, which required the intervention of a healthcare provider to reposition it. These periods combined with those of recalibration of ...

Exhaled nitric oxide (NO) is an important biomarker in asthma and other respiratory disorders. The optical performance of a NOCO(2) sensor employing integrated cavity output spectroscopy (ICOS) with a quantum cascade laser operating at 5.22 microm capable of real-time NO and CO(2) measurements in a single breath cycle is reported. A NO noise-equivalent concentration of 0.4 ppb within a 1-sec in...

PURPOSE The purpose of this study was to evaluate the potential of using capnography to analyze respiratory samples taken from a scavenging nitrous oxide nasal hood during routine pediatric dental procedures. METHODS Twenty-two subjects, aged 60-116 months, were administered alternately either 40% nitrous oxide/60% oxygen or 100% oxygen during two sequential restorative appointments. All subj...

This paper proposes the effective compensation method for the IR lamp deterioration in NDIR capnograph system. The newly designed optical chamber with two IR lamps and an electronic hardware for controlling lamp intensity have been implemented. After applying the proposed optical chamber and reference lamp control circuit to the NDIR type capnograph system, it is identified that the proposed me...

Background: The break through spontaneous effort in anaesthetized and ventilated patients is seen as ‘curarecleft’ during expiratory plateau phase of the capnography. At the open position of the sevoflurane vaporizer, the sevograph displays a mirror image graph to the capnograph. We studied the sevograph changes corresponding to ‘curare-cleft’ in capnography. Methods: We have observed that duri...