OBJECTIVE: The purposes of the study were to: (1) describe the aggregate strength of the relationship of arterial oxygen saturat ion as measured by pulse oximetry with the standard of arterial blood gas analysis as measured by co-oximetry, (2) examine how various factors affect this relationship, and (3) describe an aggregate estimate of the bias and precision be tween oxygen saturation as meas...

Dr. Frost has no relevant financial conflicts to disclose. C erebral oximetry has been studied for more than 30 years, and has been commercially available to clinicians for more than 2 decades. 1,2 However, whereas pulse oximetry has been a standard of care for decades, only recently has cerebral oximetry been extensively studied and adapted to investigate changes in oxygen delivery to the brai...

Intermittent snoring and cyclic oscillations of heart rate and oxyhaemoglobin saturation (Sao2) are characteristic features of the obstructive sleep apnoea syndrome (OSAS). Thus, overnight recordings of laryngeal sounds and heart rate by a portable device (MESAM) and of Sao2 by oximetry are applicable to screen outpatients for the presence of OSAS. Computerized analysis for time intervals of co...

BACKGROUND Traumatic brain injury is a major cause of mortality and morbidity worldwide. It can be worsened by secondary injury particularly with hypoxia or hypotension. Current prehospital guidelines emphasise regular measurement of peripheral oxygen saturation and blood pressure but there is no monitor in use to provide direct information relating to blood flow or oxygen delivery to the brain...

BACKGROUND Decreased arterial oxygen pressure obtained at peak exercise is strong evidence of walking-induced hypoxemia, assuming that the lower pressure occurs just before exercise is stopped. Using empirical predefined models and transcutaneous oximetry, we have shown that some patients reporting exercise intolerance show a minimal value at the onset of walking and a post-exercise overshoot. ...

OBJECTIVE To determine the prevalence of sleep disordered breathing within a United Kingdom heart failure population. SUBJECTS 104 patients and 21 matched normal volunteers. METHODS Overnight home pulse oximetry with simultaneous ECG recording in the patient group; daytime sleepiness was assessed using the Epworth sleepiness scale (ESS); 41 patients underwent polysomnography to assess the v...

Case: An infant was dropped off in the emergency center by a family who expressed no intent to return. It was presumed that the infant was born the day before admission based on information gathered by the emergency center. However, no information was provided regarding the infant’s name or place of birth. The patient appeared well and was admitted to the newborn nursery. Vital signs were reass...

Orthodeoxia has been described in patients with hereditary haemorrhagic telangiectasia (HHT) and pulmonary arteriovenous malformations (PAVM), but its usefulness in screening children for PAVMs is unknown. We show here that while oximetry is overall lower in children with significant PAVMs, supine and upright oximetry is of no additional diagnostic value indicating that positional oximetry is n...

AIM: To identify current 'Golden Hour' practices for initial stabilisation of very preterm infants <32 weeks' gestational age (GA) within tertiary neonatal intensive care units (NICUs) in the Australian and New Zealand Neonatal Network (ANZNN). METHODS: A 76-question survey regarding delivery room (DR) NICU was distributed electronically to directors perinatal NICUs ANZNN January 2019. Response...

Pulse oximetry measures the relative concentration of arterial oxygenated hemoglobin and reduced hemoglobin. This paper presents the design of a pulse oximeter, which measures the presence of a third substance, carboxyhemoglobin (HbCO), by unfiltered LEDs at 660 nm, 810 nm, and 940 nm. Background information is given on the theory of pulse oximetry. Theoretical approximations and calculations w...