The emperor penguin (Aptenodytes forsteri) thrives in the Antarctic underwater environment, diving to depths greater than 500 m and for durations longer than 23 min. To examine mechanisms underlying the exceptional diving ability of this species and further describe blood oxygen (O2) transport and depletion while diving, we characterized the O2-hemoglobin (Hb) dissociation curve of the emperor ...

In the transition from NREM to REM sleep, as in other instances of brain activation, a marked increase in cerebral blood flow and glucose uptake is observed, together with a lesser increase in O2 uptake. Brain activation also entails an increase in capillary PO2 and lactate production. The hypothesis of saturation of the oxidative machinery was advanced to explain anaerobic glycolysis and lacta...

A significant reduction in arterial blood oxygen saturation during fiberoptic bronchoscopy has been proved but it is not yet known whether all patients need supplemental oxygen during this procedure. The aim of study is to examine the relationship between peak expiratory flow rate (PEFR) before bronchoscopy and oxygen desaturation during bronchoscopy. Measurement of PEFR (% predicted) performed...

BACKGROUND: The present study was undertaken to examine the feasibility of venous oxygen measurements in the inferior vena cava (IVC) via a catheter through the umbilical vein. This may serve as a proxy for mixed venous oxygenation and the complications of right atrial cannulation can be avoided at the same time. It has the added advantage of not being affected by atrial right-left shunting. RE...

Little is known regarding the changes in blood oxygen tension (P(O2)) with changes in brain function. This work aimed to measure the blood P(O2) in surface arteries and veins as well as tissue with evoked somato-sensory stimulation in the anesthetized rat. Electrical stimulation of the forepaw induced average increases in blood flow of 44% as well as increases in the tissue P(O2) of 28%. More i...

a survey of tissue oxygenation differences in intensive care patients with blood transfusion     haghighimoghadamy [1] *, valizadeh ma [2] , feizi a [3]     received: 26 dec, 2011 accepted: 7 mar, 2012     abstract   background & aims : greater than 75% patient that hospitalized in intensive care units has anemia. blood transfusion in icu is not recently and about 40-70% patients in intensive c...

A 31 year-old female with Trisomy 21, uncorrected complete atrioventricular septal defect (AVSD) and consequent Eisenmenger syndrome presented to our emergency department with dyspnea, hypoxia, and worsening cyanosis. She was found to be hemodynamically stable with a heart rate of 70 bpm and blood pressure of 100/60. There was no pulsusparadoxus. She was notably cyanotic, platypneic, and hypoxi...

BACKGROUND Fear of infection limits the willingness of laymen to do cardiopulmonary resuscitation (CPR). This study assessed the time course of change in arterial blood gases during resuscitation with only chest compression (no ventilation) in an effort to identify the time for which ventilation could be deferred. METHODS AND RESULTS Aortic pressures and arterial blood gases were monitored in...

Allergic rhinitis (AR) is a disease that presents with symptoms like nasal discharge, blockage, and itchiness, which impair the quality of life most patients depending on its severity. The common symptom in AR persistent bilateral may indirectly potentially affect airflow into lung. However, can be controlled using intranasal steroid spray (INS). This study investigated role obstruction lowerin...