Impedance rheography for systemic and pulmonary circulation study and clinical application

Pałko, T.

doi:10.1007/978-3-540-73841-1_157

Cited by 3 publications

(6 citation statements)

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“…The photoplethysmogram method records changes in the tissue optical density, which depends on the blood supply. The rheographic index (RI, Ohm), diastolic index (DSI, %) and dicrotic index (DCI, %) were determined also using the impedance method for investigation of right pulmonary artery blood flow (RPABF) (Palko, 2007). The rheographic index characterizes the intensity of arterial blood flow in the lung.…”

Section: Methodsmentioning

confidence: 99%

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Features of hemodynamics of pulmonary circulation during the diving reflex

Podyacheva

Zemlyanukhina

Shadrin

et al. 2020

BioComm

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The adaptive cardiovascular reactions of the human diving reflex were studied. The diving reflex was activated by submerging a face in cold water under laboratory conditions. Forty volunteers (aged 18–24) were examined. ECG, arterial blood pressure (ABP) and central blood flow were recorded by the impedance rheography method in resting state, during diving simulation (DS) and after apnea. During DS there is a statistically significant decrease in the dicrotic index (DCI), which reflects a decrease in the resistive vessel tone and as well as diastolic index (DSI), characterizing lung perfusion. A comparison of the latent periods (LP) of an increase in ABP and a drop in DCI showed that a decrease in pulmonary vascular tone develops faster than ABP begins to increase. The LP for lowering DCI is from 0.6 to 10 s; for an increase in ABP — from 6 to 30 s. A short LP for DCI and the absence of a correlation between a decrease in ABP and DCI suggests that a decrease in pulmonary vascular tone during DS occurs reflexively and independently of a change in ABP.

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Section: Methodsmentioning

confidence: 99%

“…One of these mechanisms is the diving reflex inherent in humans and animals (Ilardo, 2018). The diving reflex is an interconnected set of respiratory and cardiovascular signaling reflexes aimed at economizing oxygen consumption while diving (Campbell et al, 1969;Ponganis, 2011).…”

Section: Introductionmentioning

confidence: 99%

Features of hemodynamics of pulmonary circulation during the diving reflex

Podyacheva

Zemlyanukhina

Shadrin

et al. 2020

BioComm

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“…Diagnostics such as rheovasography in the study of blood flow to the extremities, rheoencephalography in the study of blood flow to the brain, rheohepatography in the study of blood flow in the liver, rheopulmonography in the study of blood flow in the lungs, requires of the measuring range in the part of the base resistance—up to 1000

[ 8 ]. In known rheographs, the base resistance measurement range is limited mainly by the values of 200 ÷ 250

[ 5 , 9 , 11 ].…”

Section: Methodsmentioning

confidence: 99%

“…In medical diagnostics, methods of recording rheograms of any organ of the human body have been developed [3][4][5] • limbs, etc. .…”

Section: Introductionmentioning

confidence: 99%

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Advanced Computing Methods for Impedance Plethysmography Data Processing

Khoma

Kenyo

Kawala-Sterniuk

2022

Sensors

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In this paper we are introducing innovative solutions applied in impedance plethysmography concerning improvement of the rheagraph characteristics and the efficiency increase of the developing rheograms using computer methods. The described methods have been developed in order to ensure the stability of parameters and to extend the functionality of the rheographic system based on digital signal processing, which applies to the compensation of the base resistance with a digital potentiometer, digital synthesis of quadrature excitation signals and the performance of digital synchronous detection. The emphasis was put on methods for determination of hemodynamic parameters by computer processing of the rheograms. As a result–three methods for respiratory artifacts elimination have been proposed: based on the discrete cosine transform, the discrete wavelet transform and the approximation of the zero line with spline functions. Additionally, computer methods for physiological indicators determination, including those based on wavelet decomposition, were also proposed and described in this paper. The efficiency of various rheogram compression algorithms was tested, evaluated and presented in this work.

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Vascular Reactions of the Diving Reflex in Men and Women Carrying Different ADRA1A Genotypes

Baranova

Podyacheva

Zemlyanukhina

et al. 2022

IJMS

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The diving reflex is an oxygen-saving mechanism which is accompanied by apnea, reflex bradycardia development, peripheral vasoconstriction, spleen erythrocyte release, and selective redistribution of blood flow to the organs most vulnerable to lack of oxygen, such as the brain, heart, and lungs. However, this is a poorly studied form of hypoxia, with a knowledge gap on physiological and biochemical adaptation mechanisms. The reflective sympathetic constriction of the resistive vessels is realized via ADRA1A. It has been shown that ADRA1A SNP (p.Arg347Cys; rs1048101) is associated with changes in tonus in vessel walls. Moreover, the Cys347 allele has been shown to regulate systolic blood pressure. The aim of this work was to evaluate whether the ADRA1A polymorphism affected the pulmonary vascular reactions in men and women in response to the diving reflex. Men (n = 52) and women (n = 50) untrained in diving aged 18 to 25 were recruited into the study. The vascular reactions and blood flow were examined by integrated rheography and rheography of the pulmonary artery. Peripheral blood circulation was registered by plethysmography. The ADRA1A gene polymorphism (p.Arg347Cys; rs1048101) was determined by PCR-RFLP. In both men and women, reflective pulmonary vasodilation did occur in response to the diving reflex, but in women this vasodilation was more pronounced and was accompanied by a higher filling of the lungs with blood.. Additionally, ADRA1A SNP (p.Arg347Cys; rs1048101) is associated with sex. Interestingly, women with the Arg347 allele demonstrated the highest vasodilation of the lung vessels. Therefore, our data may help to indicate women with the most prominent adaptive reactions to the diving reflex. Our data also indicate that women and men with the Cys allele of the ADRA1A gene polymorphism have the highest risk of developing lung hypertension in response to the diving reflex. The diving reflex is an oxygen-saving mechanism which is accompanied by apnea, reflex bradycardia development, peripheral vasoconstriction, spleen erythrocyte release, and selective redistribution of blood flow to the organs most vulnerable to lack of oxygen, such as the brain, heart, and lungs. However, this is a poorly studied form of hypoxia, with a knowledge gap on physiological and biochemical adaptation mechanisms.

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Impedance rheography for systemic and pulmonary circulation study and clinical application

Cited by 3 publications

References 0 publications

Features of hemodynamics of pulmonary circulation during the diving reflex

Features of hemodynamics of pulmonary circulation during the diving reflex

Advanced Computing Methods for Impedance Plethysmography Data Processing

Vascular Reactions of the Diving Reflex in Men and Women Carrying Different ADRA1A Genotypes

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