Theoretical analyses for arterial-venous O2 content difference and Haldane effect during rebreathing.

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Theoretical analyses for arterial-venous O2 content difference and haldane effect during rebreathing.

The Haldane effect coefficient in vivo and arterial-venous O2 content difference [a-v)Co2) are, more or less, influenced by the contact time (tc), PO2 and PCO2 differences between venous blood and alveolar air. To increase the accuracy of the (a-v)CO2 and the cardiac output measured by means of the rebreathing technique, factors to correct the Haldane effect (F(H] and (a-v)CO2 (F(avCO2] were ob...

متن کامل

THE EFFECT OF ARTERIAL O2 SATURATION AND HE ART RATE ON BLOOD PRESSURE DURING HYPOXIA

A periodic increase in blood pressure (BP) occurs during apneic episodes in patients with obstructive sleep apnea (OSA). Several factors including hypoxemia and an increase in heart rate (HR) were reported to be responsible for this increased BP. To examine the contribution of these two factors in increasing BP, 35 healthy male subjects (mean age±SD= 23.64±3.80) were studied in three experi...

متن کامل

A new indirect method for measuring arteriovenous O2 content difference and cardiac output from O2 and CO2 concentrations by rebreathing air.

A new indirect method for measuring the arteriovenous O2 content difference (avDO2) was developed. The avDO2 was calculated by dividing the gradient of the CO2 dissociation curve by that of a gas exchange ratio against PCO2. The latter slope was obtained from O2 and CO2 concentrations in rebreathing air. The validity of the method was tested preliminarily in human subjects by comparing the card...

متن کامل

Effect of acute hyperventilation on the venous-arterial PCO2 difference

colleagues [1] in the previous issue of Critical Care. Th e letter suggested that acute changes in the arterial partial pressure of carbon dioxide (PaCO2) can aff ect the venous-arterial diff erence in carbon dioxide tension (ΔCO2). In a study by the authors, 10 ventilated and hemodynamically stable patients were included after elective cardiac surgery. Hypocapnia was induced by increasing the ...

متن کامل

Central venous O2 saturation and venous-to-arterial CO2 difference as complementary tools for goal-directed therapy during high-risk surgery

INTRODUCTION Central venous oxygen saturation (ScvO2) is a useful therapeutic target in septic shock and high-risk surgery. We tested the hypothesis that central venous-to-arterial carbon dioxide difference (P(cv-a)CO2), a global index of tissue perfusion, could be used as a complementary tool to ScvO2 for goal-directed fluid therapy (GDT) to identify persistent low flow after optimization of p...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: The Japanese Journal of Physiology

سال: 1987

ISSN: 1881-1396,0021-521X

DOI: 10.2170/jjphysiol.37.267