Intraoperative early detection of anemia, identifying toxic levels of carboxyhemoglobin after carbon monoxide exposure and titrating drug dosage to prevent toxic levels of methemoglobin are important goals. The pulse oximeter works by illuminating light into the tissue and sensing the amount of light absorbed. The same methodology is used by laboratory hemoglobinometers to measure hemoglobin co...

Arterial blood gas tensions, pH, and carboxyhaemoglobin were measured on 322 occasions in 165 patients and the actual oxygen saturation of the haemoglobin (Sao2) was compared with the ear oxygen saturation (SEO2) recorded during the arterial sampling with a Biox IIA ear oximeter. The overall agreement between SEO2 and Sao2 was good, with a mean difference in saturation (SEO2-Sao2) of + 1.5% (SD...

I Boushey HA, Holtzman MJ. Experimental airway inflammation and hyperreactivity: searching for cells and mediators. Am Rev Respir Dis 1985;131: 312-3. 2 Bennett JD, Davies RJ. A comparison of histamine and methacholine bronchial challenges using the DeVilbiss 646 nebuliser and the Rosenthal-French dosimeter. BrJ' Dis Chest 1987;81:252-9. 3 Woolcock AJ, Peat JK, Salome CM, et al. Prevalence of b...

Advancements in various surgical techniques may be attributed to advances in the field of anaesthesia, and more so on account of better monitoring techniques.[1-3] In the last 50 years, there has been a significant reduction in anaesthesia-related morbidity and mortality. Patients undergoing surgery in low-income group countries still have 2to 3-fold increased mortality risk in comparison with ...

Photoplethysmogram (PPG) signals collected using a pulse oximeter are increasingly being used for screening and diagnosis purposes. Because of the non-invasive, cost-effective, and easy-to-use nature of the pulse oximeter, clinicians and biomedical engineers are investigating how PPG signals can help in the management of many medical conditions, especially for global health application. The stu...