EVALUATION OF FUNCTIONAL CONDITION OF RESPIRATORY MUSCLES OF PATIENTS WITH A COMPLICATED BRONCHIAL ASTHMA PATHOLOGY AND CHRONIC OBSTRUCTIVE PULMONARY DISEASES

The aim of the research was to study the functional state of respiratory muscles and neuro-respiratory drive in patients with a combined pathology of bronchial asthma and chronic obstructive pulmonary disease. The functional condition of the respiratory muscles and the tone of the respiratory centre were determined with the help of a device for occlusion spirometry. Also, the patient was observed with a spirometry, a general plethysmography of the body. Materials and methods. 140 patients with combined broncho-obstructive pathology, 34 patients with asthma and 17 patients with COPD were examined. Spirometry, general plethysmography of the body and occlusion spirometry were provided for all patients. Results show a decrease in muscle strength of breath in all categories of patients with broncho-obstructive diseases, especially expressed in patients with bronchial asthma and asthma-COPD intersection. The muscle strength of breath was maintained with a significant increase in COPD patients compared with those with bronchial asthma. With increasing broncho-obstruction in patients with asthma-COPD intersection, there was a progressive and reliable decrease in muscle strength for breath and expiration, as well as a tendency to increase neuron respiratory drive. In patients with asthma-COPD intersection with more expressed symptoms revealed a significant and reliable weakening of muscle strength for breath and increased neuro-respiratory drive. During the work were obtained reliable links of the parameters of respiratory muscle strength not only with the parameters of pulmonary volume and bronchial patency, but also with the degree of neutrophilic inflammation in this category of patients. Conclusions. The obtained data on failure of the functional state of the respiratory muscles and the neuro-respiratory drive can be used in the development of rehabilitation programs for the management of patients with combined broncho-obstructive pathology.


Introduction
In a number of issues of modern medical science and practice, a significant place is occupied by broncho-obstructive diseases: bronchial asthma (BA) and chronic obstructive pulmonary disease (COPD).Recently, a combination of these two diseases, the so-called asthma-COPD intersection (ACP), characterized by more expressed symptoms, frequent exacerbations and worse prognosis in comparison with two pathologies separately [1,2].
Despite the ongoing research and analysis of data on this pathological condition, the state of respiratory muscles in this category of patients remains uncertain.In connection with the importance of the pathogenetic influence of respiratory muscles on the development of symptoms, manifestations of broncho-obstructive diseases, as well as its role in the formation of chronic pulmonary insufficiency, it becomes obvious the need to take into account its condition and properties for the management of such patients.

Medicine and Dentistry
One of the most commonly used methods for assessing the functional state of respiratory muscles in Ukraine and in the world is occlusive spirometry, which allows non-invasive and with minimal effort of patients to define discoordination in the work of respiratory muscles and changes in the central regulation of the respiration process [3,4].

Aim of the research
Determination of features of the functional state of respiratory muscles and neuro-respiratory drive in patients with combined pathology of asthma and COPD, depending on the severity and nature of the disease.

Materials and methods
Patients with symptoms of BA+COPD were included in the study.The diagnosis was exposed according to the criteria given in GINA and GOLD [5,6].All patients had persistent, but variable symptoms that are specific for asthma and COPD, the state of patients was stable, no exacerbation in 2 months period before the study began.During the evaluating of the function of external respiration (FER) in all patients were determined signs of bronchial rejectionan increase in volume of forced exhalation for 1 s (VFE1) in 200 ml and 12 % or more after application of bronchodilator (400 mcg of salbutamol), indications of the presence of fixed broncho-obstructionratio of forced exhalation for the first second/forced lung capacity (VFE1/FLC) <70 % after bronchodilator.Also, the study included patients with asthma and COPD.Characteristics of patients are given in Table 1.The functional state of the respiratory muscles and the tone of the respiratory centre were determined with the help of a device for occlusion spirometry.The main indicators for assessing the state of inhalation and exhalation muscles, as well as for the respiratory centre were PImax (inspirational muscle strength), PEmax (exuding muscle strength), and P0.1 (neuro-respiratory drive).Also, the patient was observed with a spirometry, a general plethysmography of the body (JaegerMasterScreen, ErichJaegerGmbH, Germany) with the methods of the company-developer.The study was conducted in the morning, after a 12-14 hour break in the administration of drugs.All patients also determined the level of interleukin 17 blood serum on an empty stomach by the method of immunoassay analysis on the device Biotec ELx808 (USA).
Data accumulation and their mathematical processing were carried out with the help of licensed software products included in the package Micrоsoft Office Professional 2007, the license Russian Academic OPEN NoLevel number 43437596.Statistical processing was performed using mathematical and statistical capabilities of MS Excel.The parameters investigated in the study were evaluated by means of determining the average (M), the mean error (m), the reliability (t), the significance level (p), followed by comparison using the t-criterion of the Student and the U-The Mann-Whitney Criterion, depending on the type of distribution of the received data.The verification of the numeric rows for compliance with normal distribution was carried out using the special function NORMSAMP_1 developed for the Excel program.

Results of the research
The analysis of the results of occlusion spirometry made it possible to conclude that in all categories of patients with broncho-obstructive diseases there is a decrease in the strength of inspiratory muscle, which are most expressed in patients with asthma and ACP.The power of expiratory muscles of patients with COPD was significantly higher in compare to those with asthma.The force of expiratory muscles of patients with ACP was significantly lower than those with COPD.Also, in patients with acute respiratory virulence, there was a significant increase in neuro-respiratory drive in compare to those with asthma and COPD.The data is shown in the Table 2.In patients with low broncho-obstruction (GOLD 1 group), the rate of inspiration muscle strength was within the normal range, but with increased broncho-obstruction, there was a significant decrease in the above-mentioned indicator (in patients from the GOLD 2 group, a significant decrease in PImax in compare to the GOLD 1 group).Also, with increased broncho-obstruction, there was a significant decrease in the strength of the exhalation muscles, which was most expressed in patients with VFE1 <50 % (GOLD 3-4 group).The data is shown in the Table 3.
During the compare of the indicators of occlusion spirometry of patients with ACP, depending on the state of symptoms and the number of exacerbations (when distributed according to the clinical groups of GOLD), a reliable and significant decrease in inspiration muscle strength, a tendency to decrease exhalation muscle strength and a significant increase in neuro-respiratory drive in patients with ACP with more expressed symptoms (GOLD B, D group).The data is shown in the Table 4.One of the main symptoms of broncho-obstructive illness is dyspnea, which progresses (over time, worsens), persists (available daily), worsens during exercise and respiratory infections [7][8][9].There are several validated questionnaires for assessing the symptoms in COPD patients.GOLD suggests applying the Modified Scale to assess the severity of shortness of breath.The modified dyspnea scale correlates well with other instruments for measuring the health status [10][11][12].The scale includes 5 statements, which contain the entire spectrum of pulmonary insufficiency from 0 (no dyspnea) to 4 (maximum expressed dyspnea).
One of the objectives of the study was to assess the state of the respiratory muscles, depending on the severity of dyspnea, which was assessed using the MDR scale.With increasing dyspnea in patients with ACP, there was a reliable and significant decrease in inspiration muscle strength and increased neuro-respiratory drive.The data is shown in the Table 5.A comparative analysis of occlusion spirometry indices in patients with different age groups was also conducted.At the same time, a significant decrease in inspiration muscle strength and increased neuro-respiratory drive in patients with ACP over the age of 70 years in compare to patients of younger age groups.The data is shown in the Table 6.
At the last stage of the work, a correlation analysis of functional parameters of respiratory muscle and pulmonary volume, bronchial patency and anti-inflammatory cytokine levels in patients with ACP was performed.Patients with ACP had a significant positive correlation link of the medium strength between the volume of forced exhalation in 1 second and inspiration muscle strength (r=0.51,p<0.05) (Fig. 1).Also, in ACP patients there was a significant positive correlation link of the low strength between the general resistance of the lungs and the degree of neuro-respiratory drive (r=0.54,p<0.05) (Fig. 2).Patients with ACP had a significant positive correlation link of low strength between bronchial resistance and the degree of neuro-respiratory drive (r=0.36,p<0.05) (Fig. 3).

Medicine and Dentistry
Patients with ACP had a significant positive correlation link of low strength between interleukin 17 and the degree of neuro-respiratory drive (r=0.25,p<0.05) (Fig. 4).

Discussion
The results of our study show a decrease in muscle strength in the inspiration muscles in all categories of patients with broncho-obstructive diseases, especially expressed in patients with asthma and ACP.The muscle strength of the exhalation was maintained with a significant increase in COPD patients in compare to those with asthma.
Respiratory muscles in broncho-obstructive diseases operate in conditions of increased load, increased resistance, caused by the presence of hyperinflation and reduction of bronchial compliance [13][14][15].Resistance of respiratory tract in patients with COPD is 5-15 times higher in comparison with such of healthy persons.Hyperinflation also contributes to reducing the contractile properties of respiratory muscles [16][17][18].
With the strengthening of broncho-obstruction in patients with ACP, there was a progressive and reliable decrease in exhalation and inspiration muscle strength, as well as the tendency to increase neuro-respiratory drive.
P0.1 reflects the reduction of respiratory pressure in the first 100 ms of an independent attempt to breathe a patient with occlusion of the respiratory tract.For patients with obstructive or restrictive pathology, this indicator usually increases, as breathing is accompanied by additional efforts to overcome the increased resistance of the respiratory tract.Thus, an increase in neuro-respiratory drive is a criterion for increased work of breathing of patients [19].
Patients with ACP with more expressed symptoms revealed a significant and reliable weakening of inspiration muscle strength and increased neuro-respiratory drive.In particular, such a symptom as dyspnea significantly and reliably influenced on the above parameters of patients with ACP.
Over time, the muscle strength was reliably reduced in dysfunction without significant changes in other parameters of the functional state of the respiratory muscles.
Reliable positive correlations of the parameters of bronchial patency and pulmonary volume with inspiration muscle strength confirm the negative effect of broncho-obstruction on the strength of respiratory muscles in patients with combined broncho-obstruction pathology [20].
The degree of central regulation of respiration (neuro-respiratory drive) is also independently associated with the overall bronchial resistance (Rtot) and the level of anti-inflammatory cytokine II 17, which is known to support the activity of neutrophilic inflammation in broncho-obstructive diseases.
Thus, during the work were obtained reliable links of the parameters of the respiratory muscle strength not only with the parameters of pulmonary volume and bronchial patency, but also with the degree of neutrophilic inflammation in this category of patients.

Conclusions
1. Patients with asthma, COPD and their combination had dysfunctions of respiratory muscles of varying severity.
2. The highest degree of dysfunctions in the work of respiratory muscles was found in patients with acute respiratory virulence with a high level of bronchial obstruction, with severe symptoms, in particular shortness of breath, and older.

Introduction
For over a decade, WHO has adopted a numbers of policy documents on the global elimination of CS and new cases of HIV infection in infants and young children [1].
In 2007 WHO launched an initiative for the global elimination of congenital syphilis, outlined in "The global elimination of congenital syphilis: rationale and strategy for action" [2].
The global community has committed itself to eliminating mother-to-child transmission (MTCT) of HIV and syphilis as a public health priority [3].
Elimination of MTCT of HIV and syphilis is motivated by the fact that such a double elimination will facilitate the improvement of a wide range of results on the protection of the health of mothers and children.This integrated approach is necessary to improve the efficiency and quality of mother and child health (MCH) services and to offer women more comprehensive primary care services.

Fig. 1 .
Fig. 1.Correlation link between the force of muscles and the VFE1

Fig. 2 .
Fig. 2. Correlation link between the strength of the muscles of inspiration and FLC

Fig. 3 .
Fig. 3. Correlation link between the index of neuron-respiratory drive and general bronchial resistance

Table 1
Characteristics of patients and healthy persons

Table 3
Indicators of the respiratory muscles strength of patients with ACP, depending on the degree of bronchoobstruction

Table 4
Indicators of respiratory muscle strength of ACP patients w depending on the clinical group of patients classified by GOLD

Table 5
Indicators of the strength of respiratory muscles of patients with ACP, depending on the level of shortness of breath

Table 6
Indicators of the strength of respiratory muscles of ACP patients, depending on age