scholarly journals Dynamics of changes in the immune system and antioxidant protection in the treatment of acute pancreatitis

2019 ◽  
Vol 23 (1) ◽  
pp. 110-113
Author(s):  
K. E. Ishcheikin ◽  
V. V. Petrushenko ◽  
D. I. Grebeniuk ◽  
O. M. Zatserkovna ◽  
L. M. Malyk ◽  
...  
Keyword(s):  
Acute Pancreatitis ◽  
Immune System ◽  
Immune Status ◽  
Antioxidant Defense System ◽  
The State ◽  
Control Group ◽  
Comprehensive Treatment ◽  
Antioxidant Protection ◽  
Group I ◽  
Edematous Pancreatitis

The aim of the work was to study the dynamics of changes in the immune system indices and antioxidant protection when fluoroquinolones are included in the treatment regimen for acute edematous pancreatitis. The study included 86 patients with a diagnosis of acute edematous pancreatitis. Group I (n=40) consisted of patients who received treatment according to national and local standards and protocols, group II (n=46) — patients who additionally received fluoroquinolones as part of a comprehensive treatment. The control group consisted of 48 conditionally healthy people in whom laboratory and instrumental diagnostics were carried out similarly to those in patients with acute pancreatitis. According to the purpose and objectives of the study, the state of the immune system and the antioxidant defense system was studied. In patients with acute pancreatitis, changes in the indicators of the immune status were revealed, manifested by the formation of a secondary immunodeficiency with the addition of an autoimmune component. The traditional scheme of pharmacotherapy of acute pancreatitis without the use of antibiotics made it possible to partially correct the indicators of immune status. The use of ciprofloxacin in the complex pharmacotherapy of acute pancreatitis contributed to the normalization of the studied parameters. Thus, the use of fluoroquinolones in the complex pharmacotherapy of acute pancreatitis made it possible to effectively normalize the state of the immune system, cytokine and antioxidant statuses.

scholarly journals RESULTS DYNAMICS RESEARCH ACTIVITY OF ANTIOXIDANT ENZYMES AND LEVELS OF ORAL FLUID MALONOVOHO DYALDEHIDU IN PATIENTS WITH GENERALIZED PERIODONTITIS AND RHEUMATOID ARTHRITIS WHO LIVE IN ECOLOGICALLY UNFAVORABLE AREA UNDER THE INFLUENCE OF COMPLEX TREATMEN

2020 ◽  
pp. 85-91
Author(s):  
K. V. Kovalyshyn ◽  
M. M. Rozhko
Keyword(s):  
Rheumatoid Arthritis ◽  
Antioxidant System ◽  
Oral Fluid ◽  
Malonic Dialdehyde ◽  
The State ◽  
Control Group ◽  
Comprehensive Treatment ◽  
Antioxidant Protection ◽  
Healthy Individuals ◽  
Group I

The aim of our research was to study the indicators changes in antioxidant protection and malonic dialdehyde (MDA) levels in the oral fluid in patients with  GP and rheumatoid arthritis (RA) who live in environmentally unfavorable areas and  assessment of the dynamics of changes in the studied indicators in the oral fluid under the influence of comprehensive treatment. Materials and methods. 105 patients with GP were examined and treated, of which 70 patients were with RA. Depending on the ecological living conditions of patients with RA was divided into two groups: group I (n = 35) - live in environmentally unfavorable areas; group II (n = 35) - live in environmentally favorable areas. Group III (n = 35) was formed by patients with GP without concomitant pathology. Each of the groups, depending on the severity of GP was divided into subgroups: A - GP of the I degree; B - GP of the II degree of severity. The control group consisted of 18 virtually healthy individuals with intact periodontium and preserved dentition. The state of the prooxidant system of the oral cavity was determined by the level of MDA. To study the state of the antioxidant defense system (AOS), the activity of superoxide dismutase (SOD) and catalase was determined. Research results.  Determining the level of MDA in oral fluid in all subgroups of patients with GP and RA and without concomitant pathology revealed an increase in this indicator before treatment. It increased most significantly in the IB subgroup to 1.19 ± 0.02 nmol/l and in the IA subgroup to 1.16 ±0.01 nmol/l, compared with 0.34 ± 0.17 nmol / l in healthy individuals. (* pIB-3 <0.001, * pIA-3 <0.001), which exceeded it by 3.5 and 3.4 times, respectively, which may be due to the negative impact of the environment. During all follow-up periods after conducted treatment, the level of MDA decreased and most closely approached the rate of healthy individuals after 6 months. However, before treatment, depletion of the antioxidant system was detected in all subgroups, as evidenced by the weakening of the AOS. In particular, in the IB subgroup there is the greatest decrease in the activity of SOD to 35.6 ± 0.56%, compared with the group of healthy individuals 49.06 ± 0.03% (p <0.001) and catalase to 4.42 ± 0.03 с.u along with healthy - 6.64 ± 0.01 c.u (p <0.001). The activity of certain antioxidant protection enzymes tends to increase after a comprehensive treatment in all subgroups after 6 months. And in the IB subgroup the activity of SOD after 6 months was 44.77 ± 0.35%, catalase 6.29 ± 0.03c.u. Conclusions. The results of the conducted biochemical researches of oral fluid in patients with GP and  RA, who live in environmentally unfavorable areas, showed a decrease in the activity of SOD enzymes, catalase and increased levels of MDA in these patients. After the conducted complex treatment there is a normalization of the AOS system, which is manifested in increased activity in the oral fluid SOD and catalase, as well as a decrease in MDA, which indicates a decrease in inflammation process and the effectiveness of our treatment and prevention complex on the antioxidant system, which provided remission GP in these patients.

scholarly journals EFFECT OF SKY YOGA AND PRANAYAMA ON EMOTION AMONG COLLEGE GIRLS

2019 ◽  
pp. 1-2
Author(s):  
S. Neelavathy ◽  
R. P. Balasubramania
Keyword(s):  
The State ◽  
Psychological Effects ◽  
Control Group ◽  
Not Given ◽  
Psychological Change ◽  
Group I ◽  
State Of Mind ◽  
Before And After ◽  
Post Test ◽  
Experimental Group

Emotion is the ability of a person to express the state of mind which he is, but when a person is mentally, physically, emotionally, and spiritually unstable results in a psychological change and helpless on situations. The purpose of the study was to nd out Effect of SKY yoga and pranayama on emotion among college girls .To achieve the purpose of the study 45 College girls were selected randomly from Coimbatore as the subjects. The subject's age ranged from 18 to 21 years. . The selected subjects were divided into 3 groups. Experimental Group I under went on sky yoga only & Experimental Group II went on pranayama only for 50 minutes per day, six days a week for 12 weeks. The control group was not given any practice. The pre-test and post-test were conducted before and after the training for all three groups. The data collected from the groups before and after the training period were statistically analysed by using Analysis of Co-Variance (ANACOVA) to determine the signicant difference and tested at 0.05 level of signicance. The result of the study showed that there was signicant improvement in the emotion of the Experimental Groups I, II subjects than the Controlled group. Through the SKY yoga and Pranayama Emotion got controlled. The conclusion was that SKY yoga controlled emotions and got reduced the psychological effects depression and stress etc. among college girls.

scholarly journals The cell protection of weated pigs for probiotics

2020 ◽  
pp. 111-119
Author(s):  
L. Bondarenko
Keyword(s):  
Immune System ◽  
Blood Serum ◽  
Phagocytic Activity ◽  
Lysozyme Activity ◽  
The State ◽  
Natural Resistance ◽  
Phagocytic Index ◽  
Control Group ◽  
Stressful Situation ◽  
Experimental Group

The immune system is central to ensuring the consistency of the body's homeostasis. The state of the body's natural resistance is determined by a set of non-specific protective mechanisms. Lymphocytes and phagocytes are actively involved in maintaining immunity. Lymphocytes recognize the antigens of pathogenic microorganisms, and phagocytes absorb and destroy the pathogens themselves. During the weaning of piglets from sows there is a decrease in the protective forces of their body. During this period, the natural resistance of the piglets is reduced due to the stressful situation caused by changing conditions of confinement, the transition to full feed and lack of sows. The immune system of weaning pigs is relatively weak, so when exposed to environmental and technological stressors, they become susceptible to various diseases. The use of probiotic drugs stimulates the activity of the immune system, prevents stress and immunodeficiency. One of these probiotics is the probiotic of domestic production Protecto-active. It w observed the the influence of the probiotic Protecto-active on the indices of nonspecific resistance of the young pigs organism to the growth. An increase in bactericidal activity of blood serum by 12.10% (P <0.05) and lysozyme activity of blood in the piglets of the experimental group was increased by 3.71% compared to control, which indicates the activation of the body's defenses and the increase in adaptive capacity. An important step in the study of the influence of the probiotic Protekto-active on the state of the immune system is to determine the phagocytic activity of neutrophils, phagocytic index and phagocytic number. In the experimental group of piglets that were fed the probiotic Protecto-active, we found an increase in leukocyte phagocytic activity by 9.0% (P <0.001), a phagocytic index by 51.7% (P<0.001) and a phagocytic number by 24.8% ( P <0.01) compared with the control group. Thus, using a probiotic Protecto-active, all indicators of phagocytosis increase: the number of phagocytes increases, their ability to capture microorganisms and increases their digestive capacity, it increases the bacterial and lysozyme activity of blood serum, which is positively reflected in the immunobiosity. Key words: probiotic, phagocytosis, phagocytic index, phagocytic number, phagocytic activity of leukocytes, cellular immunity, piglets

scholarly journals Treatment outcomes in patients with multiple and concomitant trauma managed with minimally invasive osteosynthesis technologies and electromagnetic waves of the terahertz range

2021 ◽  
Vol 27 (1) ◽  
pp. 6-12
Author(s):  
S.Yu. Lukin ◽  
◽  
Yu.P. Soldatov ◽  
A.N. Diachkov ◽  
◽  
...  
Keyword(s):  
Immune System ◽  
Minimally Invasive ◽  
Electromagnetic Waves ◽  
Bone Fractures ◽  
Damage Control ◽  
Medullary Canal ◽  
Terahertz Range ◽  
Control Group ◽  
Minimally Invasive Osteosynthesis ◽  
Group I

Purpose To assess the effectiveness of minimally invasive technologies of osteosynthesis and electromagnetic waves of the terahertz range in patients with multiple and concomitant trauma. Materials and methods The process of rehabilitation was studied in 513 patients with polytrauma of varying severity which was more than 26 points on the ISS scale. The patients were diagnosed with 545 injuries of different organs and systems. All patients with severe concomitant and multiple trauma were divided into 3 groups: Group I of controls, treated in1995–2001, consisted of 269 patients whose treatment was conservative and aggressive (surgical, with the use of plating or intramedullary osteosynthesis); Group II was the experimental study group consisting of subgroup A of 202 patients treated in 2002–2009 in whom “damage control” concept was applied and subgroup B of 42 patients treated in 2010–2017 using the damage control tactics and new minimally invasive methods of treatment and devices (non-invasive lung ventilation in intensive care for fat embolism; rational osteosynthesis in closed chest trauma; minimally invasive guided method of transosseous osteosynthesis, including the use of fixators with hydroxyapatite coating; rational surgical approach to pelvic bones; universal guide for reaming the medullary canal) and exposure to electromagnetic waves of the terahertz range (EMWTHR)of the xiphoid process of the sternum to stimulate the immune system. Results It was revealed that the use of minimally invasive, low-traumatic methods of treating bone fractures in severe polytrauma and methods stimulating the immune system and tissue regeneration (subgroup II B) contributed to an improvement of anatomical and functional results of treatment by 1.3 times compared with the control group. The quality of life of patients in this group, in comparison with the control group, was 1.6 times higher for injuries of the upper limb and 1.9 times higher for injuries of the lower limb. An integral analysis of the effectiveness of the treatment revealed a reliable increase in the effectiveness to a satisfactory level. Conclusion The use of EMWTHR in the complex treatment of such patients is a promising method for stimulating hematological and immunological processes. The first results described in the literature are optimistic.

Effect of electromagnetic waves from mobile phone on immune status of male rats: possible protective role of vitamin D

2017 ◽  
Vol 95 (2) ◽  
pp. 151-156 ◽  
Author(s):  
Ola Ahmed El-Gohary ◽  
Mona Abdel-Azeem Said
Keyword(s):  
Vitamin D ◽  
Immune System ◽  
Mobile Phone ◽  
Protective Role ◽  
Vitamin D Supplementation ◽  
Male Rats ◽  
Control Group ◽  
Group I ◽  
Mobile Phone Radiation

There are considerable public concerns about the relationship between mobile phone radiation and human health. The present study assesses the effect of electromagnetic field (EMF) emitted from a mobile phone on the immune system in rats and the possible protective role of vitamin D. Rats were randomly divided into six groups: Group I: control group; Group II: received vitamin D (1000 IU/kg/day) orally; Group III: exposed to EMF 1 h/day; Group IV: exposed to EMF 2 h/day; Group V: exposed to EMF 1 h/day and received vitamin D (1000 IU/kg/day); Group VI: exposed to EMF 2 h/day and received vitamin D (1000 IU/kg/day). After 30 days of exposure time, 1 h/day EMF exposure resulted in significant decrease in immunoglobulin levels (IgA, IgE, IgM, and IgG); total leukocyte, lymphocyte, eosinophil and basophil counts; and a significant increase in neutrophil and monocyte counts. These changes were more increased in the group exposed to 2 h/day EMF. Vitamin D supplementation in EMF-exposed rats reversed these results when compared with EMF-exposed groups. In contrast, 7, 14, and 21 days of EMF exposure produced nonsignificant differences in these parameters among all experimental groups. We concluded that exposure to mobile phone radiation compromises the immune system of rats, and vitamin D appears to have a protective effect.

scholarly journals ФАРМАКОЛОГІЧНА ДІЯ ПРЕПАРАТУ «ЕКОСОРБ 25» ТА ВПЛИВ НА РІВЕНЬ НАПРУЖЕНОСТІ ІМУНІТЕТУ СВИНЕЙ, ЩО ЗНАХОДЯТЬСЯ НА ВІДГОДІВЛІ

2016 ◽  
Vol 18 (3(71)) ◽  
pp. 75-78
Author(s):  
Zh. Rybachuk
Keyword(s):  
Immune System ◽  
Immune Status ◽  
Positive Influence ◽  
Mean Value ◽  
Control Group ◽  
System Reduction ◽  
Group Content ◽  
Wide Range ◽  
The Difference ◽  
The Given

In the articles resulted the uses of preparation given inrelation to expediency are with adsorbent properties of «Еcosorb 25» for pigs that are on fattening. Undertakenstudies it is well–proven that introduction in the complementof ration of the indicated adsorbent from a calculation 5 kg/1the ton of forage is predetermined by an increase in the serum of blood of content of immunoproteins. Content ofimmunoproteins is in the serum of blood of pigs, that it isexposed to research to application of adsorbent was differentand was in a wide range, a mean value was 15.9 ± 3.2 gs/l immune status of investigational population is different Accordingly. Consider that such wide range of data testifiesto different activity of functioning of the immune system andconditioned by the different antigen loading each ofinvestigationalanimals. In a 21 twenty–four hours, after thebeginning of application of adsorbent of «Еcosorb 25» content of immunoproteins in the serum of blood of pigs of anexperience group is considerably less in comparing to theanimals that in composition a ration got «Ecosorb 25». Forthese pigs (control group) content of immunoproteins was at the level of a 16.6 ± 1.27g/l, but substantially differed for every animal, that testifiedtheir immune status to different. For the pigs of an experiencegroup a difference is between the least and maximal index ofcontent of immunoproteins presented 17.8% that specified onalmost identical reactivity of the immune system (reduction ofreceipt of antigens, maybe and mycotoxins from agastrointestinal tract). Got the given is conditioned by thedisplay of adsorbent action of preparation that is entered to the ration of pigs of an experience group. Positive influence of «Ecosorb 25» on functioning of the immune system atintroduction to the ration of pigs that are on fattening, theresults of research of serum of blood testify through 2 missesafter the beginning of application. Reduction to content of immunoproteins is registered in theserum of blood of pigs of control group on 15.7% comparing to the previous index (21twenty–four hours) and 19.5% animals of an experience group. For certain (Р ≥ 0,99) contentof immunoproteins increased in the serum of blood of pigs ofan experience group 17 ± 0.25 gs/of to 14.0 ± 0.76 g/l that maybe it contingently the receipt of substances with animmunodepressive action (including and micotoxins) in the organism of animals of control group. Id est, at feeding to the pigs of preparation of «Ecosorb 25» with adsorbent properties during 2th months, stipulated reduction of receiptof toxins in blood, and accordingly and reduction offunctional activity immune. It provides rapid reactivity of the immune system andsynthesis of sufficient amount of antibodies at the hit ofmicroorganisms to the organism of pigs, that in compositiona ration got an adsorbent. As for the animals of control group registered reduction to content of immunoproteins in theserum of blood, it testifies to weakening of functional activityof the immune system. The difference of content ofimmunoproteins in the serum of blood of pigs testifies to the increase of providing of better immunological defence in the organism of animals of anexperience group and reduction of him in a control group. 

scholarly journals Use of Noninvasive Cerclage in Combination of Micronized Progesterone in Miscarriage Of Multifetal Pregnancy

2017 ◽  
Vol 24 (4) ◽  
Author(s):  
Iryna Nikitina ◽  
Alla Boychuk ◽  
Valentina Kondratiuk ◽  
Tatyana Babar
Keyword(s):  
High Risk ◽  
Pregnant Women ◽  
The State ◽  
Control Group ◽  
Group I ◽  
Prophylactic Measures ◽  
Neonatal Adaptation ◽  
Group Ii ◽  
Multifetal Pregnancy ◽  
Micronized Progesterone

We represent the results of the combined method of treatment and prevention of miscarriage in women with a multiple pregnancy and a high risk of the threat of termination the pregnancy because of using the obstetric unloading pessaries, combined with micronized progesterone. The efficiency of this method of treatment is evidenced by the rapid elimination of clinical symptoms of threatened abortion, accelerating the regression of ultrasound markers, reducing the number of complications in of pregnant women and reducing the time of their stay in hospital.Goal: To evaluate the effectiveness of the handling the obstetric pessary in combination with micronized progesterone at women with multifetal pregnancy and a high risk of miscarriage.Materials and methods. We analyzed 120 cases of multifetal pregnancies with signs of miscarriage within the terms from 16 to 28 weeks. The first group of the examined women was: 40 pregnant women with twins and signs of miscarriage, who in the scheme of treatment and prophylactic measures were offered to use the unloading obstetric pessaries in combination with continuous therapy by natural micronized progesterone until 36 weeks of pregnancy. The second group included 40 pregnant women with twins, who were laid seam on the cervix because of istmicocervical insufficiency and were applied short-term courses of therapy by gestagens. The control group comprised 40 pregnant women with twins at the age of 16-28 weeks of pregnancy who were conducted the therapy about the threat of miscarriage according to the current clinical protocols (Order of the Ministry of Health of Ukraine No. 624). It was carried out the analysis of the course of pregnancy, childbirth, the postpartum period and the state of neonatal adaptation in the surveyed groups.Results of the research and their discussion. In the first group, urgent childbirth occurred in 34 (85%) cases, in group II in 29 (72.5%) cases, in control group – in 25 (62.5%) cases. Cesarean delivery was performed in 7 (17.5%) patients of group I pregnant women, in 9 (22.5%) of group II patients and in 11 (27.5%) in the pregnant group. When studying the state of neonatal adaptation of newborns in the examined groups, the following results were obtained. The average weight of the newborns in group I was 3245 ±280 g, in group II 2865 ±365 g, in the control group - 2975 ±325 g (p>0.05). The evaluation of the state of newborns on the Apgar scale, respectively at the 1st and 5th minutes, was respectively: in newborns of the I group, 7.5 ± 1.4 and 8.4 ± 1.3 points, in group II - 7.3 ± 1.6 and 8.2 ± 1.1 points, in the control group – 7.2 ± 1.6 and 8.6 ± 1.2 (р 1-р 2> 0.05).Conclusions. Comprehensive prophylaxis of non-pregnancy in multiple pregnancies, combining the use of a traumatic cardiac cervix with the help of unloading obstetric pussies with progesterone preparations, allows prolonging pregnancy, preventing the development of prematurity, contributes to the improvement of perinatal indicators.

scholarly journals THE STATE OF HYGIENE AND LOCAL IMMUNITY OF THE ORAL CAVITY IN PATIENTS WITH ANOREXIA NERVOSA

2019 ◽  
pp. 10-13
Author(s):  
M. Yu. Antonenko ◽  
L. L. Reshetnyk ◽  
E. V. Moskalenko ◽  
N. A. Zelinska ◽  
O. A. Znachkova
Keyword(s):  
Oral Hygiene ◽  
Oral Fluid ◽  
Mirror Image ◽  
The State ◽  
The Body ◽  
Immunological Methods ◽  
Control Group ◽  
Poor Oral Hygiene ◽  
Local Immunity ◽  
Group I

Aim: to study the state of local immunity and oral hygiene in patients with GP suffering from AN.Materials and methods: 35 patients with AN were examined at the age of 19-35 years. In the study we used immunological methods, an index assessment of the state of oral hygiene (PMA, API, GI).Results and discussion: in patients of I group poor oral hygiene was established. The amount of lysozyme in the oral fluid in I group was 0.014 ± 0.07 g/l. A decrease SIgA (11SIgA) was established in patients of I group: I, II and control (135.31 ± 23.17, 130.26 ± 24.21 and 300.34 ± 27.38 mg/l, respectively). A tendency to an increase in the level of IgG in the oral fluid in patients of group II compared with I and the control group (5.35 ± 0.36, vs. 4.57 ± 0.04 and 4.98 ± 0.23 g/l, respectively) was established.Conclusions: poor oral hygiene is an objective indicator which reflects low motivation to maintain oral health. The observed immunodeficiency (11SIgA) in patients with GP is a mirror image of changes occurring in the body of patients with AN.

scholarly journals The effect of selenium on the immune status in the complex treatment of children with autoimmune thyroiditis

2019 ◽  
Vol 64 (2) ◽  
pp. 87-93
Author(s):  
G. G. Gabulov ◽  
G. I. Jabrailova
Keyword(s):  
Autoimmune Thyroiditis ◽  
Immune Status ◽  
Thyroid Tissue ◽  
Average Level ◽  
Control Group ◽  
Healthy Children ◽  
T Cell Suppression ◽  
Group I ◽  
Tnf Α ◽  
Cell Suppression

The authors studied the effect of selenium on the dynamics of immune system indicators in children with autoimmune thyroiditis. They examined 31 children (average age of 11.16 ± 0.59 years). Group I included 17 children who took selenium (100 μg per day for 6 months) along with the basic treatment. Group II (n=14) took L-thyroxin. The control group included 15 healthy children of the same age. The average level of selenium in children of Group I and II was 69.23 ± 1.52 μg / l at the beginning of the study, in the control group it was 114.8 ± 3.18 μg / l. Before treatment, children in Group I and II had T-cell suppression, the average level of all cytokines (especially TNF-α and IL-6) was significantly higher than in practically healthy children. The study demonstrated that the level of the thyroid tissue antibodies decreased significantly (p=0.001) with an increase in the level of selenium in the blood serum. By the end of the study the content of IgA (p=0.012) and IgG (p=0.044) in Group I, as well as the number of lymphocytes CD3 + (p=0.008), CD4 + (p=0.015), CD16 + / 56 + (p=0.010) significantly increased. The authors observed statistically significant decrease in the levels of TNF-α (p=0.028), IL-6 (p=0.002) and IL-1β (p=0.009) in children who took selenium in addition to the main treatment. Thus, the results of the study suggest that selenium in the complex therapy of autoimmune thyroiditis significantly reduces the titer of antithyroid antibodies and positively affects a number of important indicators of immune homeostasis in children.

Protective effect of lung inflation in reperfusion-induced lung microvascular injury

2000 ◽  
Vol 278 (3) ◽  
pp. H951-H957 ◽  
Author(s):  
Hari B. Srinivasan ◽  
Stephen M. Vogel ◽  
Dharmapuri Vidyasagar ◽  
Asrar B. Malik
Keyword(s):  
Vascular Injury ◽  
The State ◽  
Lung Model ◽  
Control Group ◽  
Lung Inflation ◽  
Group Iii ◽  
Microvascular Injury ◽  
Group I ◽  
Reperfusion Period ◽  
Wet Weight

We used the isolated-perfused rat lung model to study the influence of pulmonary ventilation and surfactant instillation on the development of postreperfusion lung microvascular injury. We hypothesized that the state of lung inflation during ischemia contributes to the development of the injury during reperfusion. Pulmonary microvascular injury was assessed by continuously monitoring the wet lung weight and measuring the vessel wall125I-labeled albumin (125I-albumin) permeability-surface area product ( PS). Sprague-Dawley rats ( n = 24) were divided into one control group and five experimental groups ( n = 4 rats per group). Control lungs were continuously ventilated with 20% O2and perfused for 120 min. All lung preparations were ventilated with 20% O2before the ischemia period and during the reperfusion period. The various groups differed only in the ventilatory gas mixtures used during the flow cessation: group I, ventilated with 20% O2; group II, ventilated with 100% N2; group III, lungs remained collapsed and unventilated; group IV, same as group IIIbut pretreated with surfactant (4 ml/kg) instilled into the airway; and group V, same as group III but saline (4 ml/kg) was instilled into the airway. Control lungs remained isogravimetric with baseline125I-albumin PS value of 4.9 ± 0.3 × 10−3ml ⋅ min−1⋅ g wet lung wt−1. Lung wet weight in group III increased by 1.45 ± 0.35 g and albumin PSincreased to 17.7 ± 2.3 × 10−3, indicating development of vascular injury during the reperfusion period. Lung wet weight and albumin PS did not increase in groups I and II, indicating that ventilation by either 20% O2or 100% N2prevented vascular injury. Pretreatment of collapsed lungs with surfactant before cessation of flow also prevented the vascular injury, whereas pretreatment with saline vehicle had no effect. These results indicate that the state of lung inflation during ischemia (irrespective of gas mixture used) and supplementation of surfactant prevent reperfusion-induced lung microvascular injury.

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