background. given the influence of systemic blood pressure on pulpal blood flow, anxiolytics prescribed may alter the pulpal blood flow along with the local anesthetic solution containing a vasoconstrictor. this study evaluated the impact of preoperative anxiolytics and vasoconstrictors in local anesthetic agents on pulpal oxygen saturation. methods. thirty anxious young healthy individuals wit...

This study investigated what effect a 30% oxygen administration had on visuospatial cognitive performance and cerebral activation and lateralization using fMRI. Eight college students were selected as the subjects for this study. An oxygen dispenser that provided 21% and 30% oxygen at a constant rate of 8L/min was developed. In order to measure the performance level of visuospatial cognition, t...

Background: Hypoxemia is a frequent complication after general anesthesia. It usually takes longer to recover in individuals with respiratory problems. Bakers may suffer from respiratory problems such as asthma. The objective of this study was to compare the occurrence of hypoxemia and duration of supplemental oxygen administration during recovery from general anesthesia in bakers and smokers. ...

Sir,—Modern anaesthetic machines have a device (usually referred to as "the oxygen bypass" or "emergency oxygen") which enables the anaesthetist to administer high flows of 100% oxygen. When a patient is connected to an anaesthetic machine it is possible to overlook the fact that the emergency oxygen device is in the "on" position and is delivering 100% oxygen. This occurrence is most likely if...

A five-day-old female infant weighing 3..6 kg. was admitted to the General Hospital, Malacca, Malaysia on 14/1/76, with severe breathlessness of one day's duration, lethargy and poor feeding. She was born at term in a private maternity home after a normal pregnancy and labour and was discharged in apparent good health the day before symptoms appeared. On examination, she was dyspnoeic with subc...

BACKGROUND Hypoxemia may compromise cell metabolism and organ function. Supplemental oxygen (O2) at high concentrations may prove ineffective, and issues relating to hyperoxia, barotrauma, mechanical ventilation, and extracorporeal oxygenation are well documented. Old reports suggest the potential safety and efficacy of alternative routes for O2 administration, such as intravenous or intestinal...