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ISSN 2522-9028 (Print)
ISSN 2522-9036 (Online)
DOI: https://doi.org/10.15407/fz

Fiziologichnyi Zhurnal

is a scientific journal issued by the

Bogomoletz Institute of Physiology
National Academy of Sciences of Ukraine

Editor-in-chief: V.F. Sagach

The journal was founded in 1955 as
1955 – 1977 "Fiziolohichnyi zhurnal" (ISSN 0015 – 3311)
1978 – 1993 "Fiziologicheskii zhurnal" (ISSN 0201 – 8489)
1994 – 2016 "Fiziolohichnyi zhurnal" (ISSN 0201 – 8489)
2017 – "Fiziolohichnyi zhurnal" (ISSN 2522-9028)

Fiziol. Zh. 2014; 60(5): 43-51

Mechanisms of changes of microcirculation in rats under acute methemoglobinemia

Rozova KV, Sydoriak NH

  1. O.O. Bogomoletz Institute of Physiology, NAS of Ukraine, Kyiv, Ukraine
  2. Bogdan Khmelnytsky Melitopol State Pedagogical University, Melitopol, Ukraine
DOI: https://doi.org/10.15407/fz60.05.043


Abstract

It was investigated the features of microcirculation and mechanisms it’s conditioned, under acute administration of sodium nitrite in 5 mg of dry substance per 100 g of body weight. It was shown that acute administration of sodium nitrite leads to the development of methemoglobinemia, arterial and venous hypoxemia, and severe tissue hypoxia. Increase in the diffusion path O2 at methemoglobinemia is caused due to significant hyperhydratation of lung air-blood barrier and its individual layers, and is accompanied by a decrease in both components of the diffusion capacity of the lungs for oxygen: its membrane and blood components. It was revealed that the administration of sodium nitrite has a double effect, leading to inactivation of hemoglobin, as well as to microcirculatory disturbances associated primarily with changes in the regulation of vascular tone. In this initial perfusion per unit volume of tissue per time unit intrinsic for the organism defines a set of mechanisms which are responsible for changes in tissue blood flow under methemoglobinemia.

Keywords: sodium nitrite, methemoglobinemia, tissue hypoxia,the air-blood barrier of lung, diffusion capacity of thelungs for oxygen, microcirculation.

Full text: (PDF, in Ukrainian)

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