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Purpose: Young women are typically thought to be protected from cardiovascular disease (CVD) before menopause. However, posttraumatic stress disorder (PTSD) increases CVD risk in women by up to threefold. Data in predominantly male cohorts point to physiological mechanisms such as vascular and autonomic derangements as contributing to increased CVD risk. The purpose of the study reported here was to determine whether young women diagnosed with PTSD, compared to those without, present with arterial stiffness and impaired autonomic control of the heart. Methods: A total of 73 healthy young women, ranging in age from 18 to 40 years, with a history of trauma exposure were included in this study, 32 with and 41 without a clinical PTSD diagnosis. We measured resting pulse wave velocity (PWV), central hemodynamics, augmentation pressure and augmentation index (AI) via pulse wave analysis using applanation tonometry. Heart rate variability was also assessed via peripheral arterial tone. Results: In comparison to controls, women with PTSD showed higher central arterial pressure (mean ± standard deviation: systolic blood pressure 104 ± 8 vs. 97 ± 8 mmHg, p < 0.001; diastolic blood pressure 72 ± 7 vs. 67 ± 7 mmHg, p = 0.003), PWV (6 ± 0.3 vs. 5 ± 0.6 m/s, p < 0.001) and AI (22 ± 13 vs. 15 ± 12%, p = 0.007) but lower standard deviation of normal-to-normal intervals (SDNN; 44 ± 17 vs. 54 ± 18 ms, p = 0.005) and root mean square of successive differences between normal heartbeats (RMSSD; 37 ± 17 vs. 51 ± 22 ms, p = 0.002). Conclusion: PTSD in young women is associated with higher brachial and central pressures, increased arterial stiffness and blunted parasympathetic control of the heart. These findings illustrate potential mechanisms underlying high risk for CVD in young women with PTSD, suggesting possible treatment targets for this at-risk group. [ABSTRACT FROM AUTHOR]

Brain 18F-FDG PET imaging is useful to characterize accelerated brain aging at a pre-symptomatic stage. This study aims to examine the interactions between brain glycolytic metabolism and hemodynamic parameters in different age groups. Methods : A total of 72 patients (from 23 to 88 years of age, 38 women) without any cerebral diseases but with available cardiac, arterial peripheral, and central blood pressure measurements as well as arterial stiffness parameters obtained from brachial pressure and applanation tonometry and a brain 18F-FDG PET scan were prospectively included into this study. Quantitative voxel-to-voxel analyses were carried out to test for negative associations between brain glycolytic metabolism and individual hemodynamic parameters (p-voxel of <0.001 for the whole population and <0.005 for age groups). Results : The heart rate parameter of the whole population showed the most extensive associations with brain metabolism (15,857 mm3, T-score: 5.1), predominantly affecting the frontal and temporal regions (69% of the volume). Heart rate for the younger age group, systolic and pulse pressure for the 41–60-year-old group, and diastolic pressure for the older group were most extensively associated with brain metabolism and mainly involved the fronto-temporal lobes (respective involvement of 52.8%, 60.9%, and 65.5%) which are also the regions implicated in accelerated brain aging. Conclusion : This cross-sectional prospective study identified extensive associations between cerebral metabolism and hemodynamic parameters, indicating common aging mechanisms. Heart rate throughout adult life, systolic and pulse pressure parameters around middle age, and diastolic pressure parameters in older patients, suggest the existence of potentially therapeutic targets to prevent accelerated brain aging. [ABSTRACT FROM AUTHOR]

Aim. Purpose of the study. To study the clinical and functional features of the parameters of arterial stiffness in the elderly, depending on gender differences. Materials and methods. The study included 497 therapeutic patients aged from 60 to 74 years. The average age of the examined patients was 65.13.9 years. All patients underwent a comprehensive clinical and instrumental examination. The study of the parameters of arterial stiffness and central arterial pressure (BP) was carried out on the AngioScan-01 apparatus (AngioScan-Electronics, Russia). Depending on the sex differences, the entire sample was divided into two age-matched groups: women (n=287) and men (n=210). Results. In the group of women, systolic levels (13820 mm Hg vs 13419 mm Hg; p=0.018), central (13720 mm Hg vs 13319 mm Hg; p=0.024), average (469 mm Hg vs 456 mm Hg; p=0.018), pulse BP (5316 mm Hg vs 5014 mm Hg; p=0.038), the value of the double product (107.423.5 conventional units vs 101.422.5 conventional units; p=0.004), augmentation index (AI) [22.1 (13.5, 31,3)% vs 15.9 (8.8; 24.9)%; p=0.005], the increase index at a pulse frequency of 75 per minute [23.2 (16.0; 30.5)% vs 15.9 (9.2; 23.5)%; p=0.005] and systole duration in percent (35.505.60 vs 34.244.53; p=0.007) were significantly higher than in the group of men. In addition, men showed a statistically significant increase in the average value of the alternative stiffness index (9.762.61 vs 8.172.03; p=0.005) and the dependence of the AI on age (p0.05). At the same time, a statistically more significant correlation of central and peripheral hemodynamic parameters with the presence of elevated AI (p0.05) was recorded in the group of women. Conclusion. In older women, an increase in systolic, central, average, pulse BP is associated with an increase in AI and an increase in the magnitude of the double product. In the group of elderly men, the increase in the alternative vascular stiffness index contributes to an increase in the duration of the pulse wave. Statistically more pronounced correlation relationships between the value of the AI and clinical and hemodynamic parameters were recorded in elderly women.

Brain 18F-FDG PET imaging is useful to characterize accelerated brain aging at a pre-symptomatic stage. This study aims to examine the interactions between brain glycolytic metabolism and hemodynamic parameters in different age groups.Methods: A total of 72 patients (from 23 to 88 years of age, 38 women) without any cerebral diseases but with available cardiac, arterial peripheral, and central blood pressure measurements as well as arterial stiffness parameters obtained from brachial pressure and applanation tonometry and a brain 18F-FDG PET scan were prospectively included into this study. Quantitative voxel-to-voxel analyses were carried out to test for negative associations between brain glycolytic metabolism and individual hemodynamic parameters (p-voxel of

Aim.Assessment of Vamloset and Co-Vamloset effects on blood pressure target levels and indicators associated with organ protection: albuminuria; elasticity of arteries and central aortic pressure (CAP); endothelial function; tumor necrosis factor-a, interleukin (IL) IL-6 and IL-10, vascular cell adhesion molecule 1 and vascular endothelial growth factor (VEGF-A). Materials and methods.The Russian multicenter open-label prospective clinical study VICTORY II which was conducted in 8 clinical centers included 103 patients 18 years with grade 23 essential arterial hypertension (AH), who were previously untreated office systolic blood pressure (SBP) 160mmHg and/or office diastolic blood pressure (DBP) 100 mm Hg or have not reached the target office blood pressure with mono- or dual therapy. The active phase of the study included 100 patients; the per-protocol (PP) population 80 patients completing the study without major protocol deviations. Patients were not randomized. The target office BP for patients without diabetes were: SBP139 mm Hg, DBP89 mm Hg; for patients with diabetes: SBP139 mm Hg, DBP84 mm Hg. All patients with grade 2 hypertension (group 1) were administrated Vamloset (amlodipine/valsartan, 5/80mg), with grade 3 hypertension Vamloset (amlodipin/valsartan, 5/160 mg). Up-titration of the dose of amlodipine/valsartan to 5/160 mg and 10/160 mg, the administration of Co-Vamloset (amlodipine/valsartan/hydrochlorothiazide) in doses of 10/160/12.5 mg, 10/160/25 mg (LLC KRKA-RUS) was carried out every 4 weeks according to the prescribed schemes. In the total group, the effect of studied therapy on the level of albumin in the urine was assessed. Before starting treatment and after 16 weeks of treatment, 40 patients in the subgroup with additional examinations underwent daily monitoring of blood pressure, assessment of pulse wave velocity and augmentation index; CAP; levels of tumor necrosis factor-, IL-6 and IL-10, vascular cell adhesion molecule 1and VEGF-A. Results.The active phase of the study included 100 patients aged 59.510.9 years (59% of women) with a duration of AH 83.48.4 months. 83% of patients received prior antihypertensive therapy by the time of enrollment in the study. The treatment duration for all patients was 15.9 weeks. After 16 weeks, therapy with Vamloset and Co-Vamloset provided an optimal decrease in BP: 90% of patients with grade 23 AH in the PP population reached the target level of office BP, the mean change in SBP / DBP was -32.2/-16.0 mm Hg. According to the data of daily monitoring of BP in the subgroup with additional examinations, the target levels of average daily SBP/DBP were reached in 52.9/67.6% of patients, respectively. Along with reliable control of blood pressure, additional organ protection with studied antihypertensive drugs after 16 weeks of therapy was shown by assessment data: albuminuria in 58.8% of patients with an initially elevated level of albuminuria (n=17), a positive effect of the studied therapy on the level of albumin in the urine was determined, augmentation index improvement in 57.1% of patients in the study group, CAP improvement in 73% of patients in the study group; positive dynamics of endothelial damage markers (IL-6, IL-10, VEGF-A) was achieved. The data on the good tolerability of AHT corresponded to the previously established safety profile of these drugs. Conclusion.In the VICTORY II clinical study in patients with grade 23 hypertension, along with high antihypertensive efficacy, a spectrum of organoprotective effects of Vamloset and Co-Vamloset on aortic stiffness with improved augmentation index and CAP, markers of endothelial damage (IL-6, IL-10, VEGF-A), the severity of albuminuria was shown.

Purpose of the study. To study the significance of cystatin C of blood plasma and its relationship with central arterial pressure and carotid intima-media thickness (CIMT) in the stratification of cardiovascular risk.Materials and methods. A general clinical and laboratory examination of 206 patients aged 16 to 88 years was performed, of which men were 101 (49%), women - 105 (51%). The mean age of the examined subjects was 51.8±14.3 years. Lipid spectrum parameters [total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C)], cystatin C, plasma uric acid and fibrinogen were studied. Glomerular filtration rate (GFR) was calculated using the F.J. Hoek et al. (2003) formula. To assess the central blood pressure, all patients underwent a contour analysis of the pulse wave on the AngioScan-01 (AngioScan-Electronics, Russia) and ultrasound examination of carotid artery (CA) on Vivid Q (USA). The type of research was single-step cross-sectional. Depending on the content of cystatin C of the blood plasma, all the examined subjects were divided into three groups. Group 1 (n=62) consisted of patients with cystatin C concentration of up to 0.99 mg/l; group 2 (n=91) - from 1.0 mg/l to 1.5 mg/l; group 3 (n=53) - over 1.51 mg/l.Results. Patients with excessive body weight, stable angina, type 2 diabetes, cerebrovascular diseases (CVD) and chronic glomerulonephritis (CGN) significantly prevailed in group 3, in comparison with groups 1 and 2 (p

Aim. Evaluation of the ability of the fixed combination of lisinopril, amlodipine and rosuvastatin (Equamer) in achievement of additional angioprotection in patients with systemic arterial hypertension (AH) and high pulse wave velocity (PWV), regardless of previous antihypertensive therapy (AHT).Material and methods. To the open multicenter observational study 24 weeks duration, 60 patients included, taking double AHT during 6 months. All participants underwent ambulatory 24 hour blood pressure (BP) monitoring, applanation tonometry (augmentation index and central BP), pulse wave velocity assessment, laboratory tests (lipids, fasting glucose, insulin resistance index (HOMA), leptin, high sensitive C-reactive protein (hsCRP) before and after transition to the fixed combination of lisinopril, amlodipine and rosuvastatin (Equamer).Results. By the data from office BP measurement, after transition of patients from the double combinations to fixed combination of lisinopril, amlodipine and rosuvastatin, there was additional decrease of systolic BP (SBP) by 14,3% and diastolic BP (DBP) by 18,5%. By the data from ABPM, decrease of SBP was 16,1%, and DBP — 21,8%. Combination of lisinopril, amlodipine and rosuvastatin decreased PWV by 14,4%, augmentation index by 14,5%, central SBP by 8,1% (p

Comorbidity of diabetes mellitus (DM) with arterial hypertension (AH) leads to four-time increase of cardiovascular risk (CVR). Achievement of target blood pressure (BP) is one of the main strategies of cardiovascular complications prevention in DM patients. Efficacy of azilsartan medoxomil is higher than of other drugs from the group.Aim. To study changes in peripheral and central BP daily profile andparameters of arterial stiffness in replacement of RAAS blocker as a partof two component antihypertension therapy (AHT) by 40 mg azilsartan medoxomil for patients with AH and type 2 DM, with dose titration to 80 mg if target BP not reached.Material and methods. Thirty AH+DM2 patients not having targetBP

Recent advances in Pulse Wave Analysis (PWA) technology enable Blood Pressure (BP) measuring devices to combine the non-invasive estimation of different vascular biomarkers in ambulatory conditions. This approach allows obtaining a dynamic assessment of vascular function during the 24-h in the conditions of daily life, including night sleep. In spite of the present limited proof of the prognostic significance of 24-h ambulatory PWA, data is accumulating indicating the ability of these techniques to facilitate the early screening of vascular alterations and to improve individual Cardiovascular (CV) risk stratification. The integration of 24-h PWA with e-health and telehealth may help boost the implementation of this approach in the routine clinical evaluation of patients at risk. Telehealth-based 24-h PWA may help standardize the evaluation of recordings by making available to doctors and researchers validated analytical algorithms through dedicated web services. It may facilitate the setup of a worldwide network between expert centres and peripheral hubs in order to improve the quality of the patient’s assessment and to provide personalized care. It may establish communication between healthcare professionals and patients allowing remote monitoring and direct counselling, ultimately improving patients’ health status. The use of telehealth may also allow creating registries and collecting big-data, useful to validate and improve the quality of the algorithms, including Artificial Intelligence (AI) and Machine Learning (ML) tools for predicting patients’ risk and guide clinical care. Preliminary evidence from one of such registries (the Vascular health ASsessment Of The hypertENSive, VASOTENS Registry) seems to indicate that telehealth-based networks may be effective to collect definitive proof of the clinical utility of 24-h PWA.

Objective · To investigate the relationship between body mass index (BMI) and central haemodynamic indices in physical examination population. Methods · December 2017 to June 2018, a total of 287 subjects undergoing health examination (164 males, accounting for 57.1%) in the Physical Examination Center, Ruijin Hospital North, Shanghai Jiao Tong University School of Medicine were included. According to BMI, the subjects were divided into normal BMI group (BMI2), overweight group (24 kg/m² ≤ BMI2), and obesity group (BMI ≥ 28 kg/m2). The peripheral systolic blood pressure (PSP), the peripheral diastolic blood pressure (PDP), the peripheral pulse pressure (PPP), and the mean arterial pressure (P-MAP) were measured, respectively. The central arterial pressures were measuredpulse wave analysis, including central systolic blood pressure (CSP), central diastolic blood pressure (CDP), central pulse pressure (CPP), central augmentation pressure (AP), and central augmentation index (AIx). The amplification index of pulse pressure was PPP/CPP. Results · ① The differences of PDP, CDP, P-MAP, AP, AIx and PPP/CPP among the three groups were statistically significant (Pr-0.140, r-0.149, Pr0.151, r0.155, r0.124, PConclusion · With the increase of BMI, AP and AIx show a downward trend, but PDP, CDP, and PPP/CPP show an upward trend; BMI and CSP have no significant correlation. [ABSTRACT FROM AUTHOR]

Recent advances in Pulse Wave Analysis (PWA) technology enable Blood Pressure (BP) measuring devices to combine the non-invasive estimation of different vascular biomarkers in ambulatory conditions. This approach allows obtaining a dynamic assessment of vascular function during the 24-h in the conditions of daily life, including night sleep. In spite of the present limited proof of the prognostic significance of 24-h ambulatory PWA, data is accumulating indicating the ability of these techniques to facilitate the early screening of vascular alterations and to improve individual Cardiovascular (CV) risk stratification. The integration of 24-h PWA with e-health and telehealth may help boost the implementation of this approach in the routine clinical evaluation of patients at risk. Telehealth-based 24-h PWA may help standardize the evaluation of recordings by making available to doctors and researchers validated analytical algorithms through dedicated web services. It may facilitate the setup of a worldwide network between expert centres and peripheral hubs in order to improve the quality of the patient's assessment and to provide personalized care. It may establish communication between healthcare professionals and patients allowing remote monitoring and direct counselling, ultimately improving patients' health status. The use of telehealth may also allow creating registries and collecting big-data, useful to validate and improve the quality of the algorithms, including Artificial Intelligence (AI) and Machine Learning (ML) tools for predicting patients' risk and guide clinical care. Preliminary evidence from one of such registries (the Vascular health ASsessment Of The hypertENSive, VASOTENS Registry) seems to indicate that telehealth-based networks may be effective to collect definitive proof of the clinical utility of 24-h PWA. [ABSTRACT FROM AUTHOR]

The central arterial pressure (CAP) is an important physiological indicator of the human cardiovascular system which represents one of the greatest threats to human health. Accurate non-invasive detection and reconstruction of CAP waveforms are crucial for the reliable treatment of cardiovascular system diseases. However, the traditional methods are reconstructed with relatively low accuracy, and some deep learning neural network models also have difficulty in extracting features, as a result, these methods have potential for further advancement. In this study, we proposed a novel model (CBi-SAN) to implement an end-to-end relationship from radial artery pressure (RAP) waveform to CAP waveform, which consisted of the convolutional neural network (CNN), the bidirectional long-short-time memory network (BiLSTM), and the self-attention mechanism to improve the performance of CAP reconstruction. The data on invasive measurements of CAP and RAP waveform were used in 62 patients before and after medication to develop and validate the performance of CBi-SAN model for reconstructing CAP waveform. We compared it with traditional methods and deep learning models in mean absolute error (MAE), root mean square error (RMSE), and Spearman correlation coefficient (SCC). Study results indicated the CBi-SAN model performed great performance on CAP waveform reconstruction (MAE: 2.23 ± 0.11 mmHg, RMSE: 2.21 ± 0.07 mmHg), concurrently, the best reconstruction effect was obtained in the central artery systolic pressure (CASP) and the central artery diastolic pressure(CADP) (RMSE CASP : 2.94 ± 0.48 mmHg, RMSE CADP : 1.96 ± 0.06 mmHg). These results implied the performance of the CAP reconstruction based on CBi-SAN model was superior to the existing methods, hopped to be effectively applied to clinical practice in the future. • A deep learning network model for the reconstruction of central arterial pressure. • The network model consisting of parallel CNN, Bi-LSTM and self-attention mechanism. • A data augmentation and normalization method to improving the learning performance. • CBi-SAN model presents better reconstruction of central arterial pressure. [ABSTRACT FROM AUTHOR]

The heart is related with vascular system anatomically and functionally. Structural and functional changes in the arterial bed increase afterload on the left ventricle (LV), and can change its function, leading to the restructuring of the LV adaptation. Systolic blood pressure (SBP) in the aorta, directly reflecting the load on the LV, differs significantly from the SBP in the brachial artery due to delaying the occurrence of a reflected wave in the aorta. Left ventricular-arterial interaction is a concept that helps to understand the various options for the «optimal» functioning of the cardiovascular system, the effects of changes in the arterial bed to heart function. Methods of analysis of left ventricular-arterial interaction, clinical consequences of the breach and the effects of antihypertensive therapy are presented in the review; the results of the authors own studies are also presented.

A plenty of trials confirm the importance of aortic wall stiffness evaluation during estimation of the cardiovascular risk and the need for novel drugs influencing this parameter. Most of hypotensive medications modify arterial wall siffness by one or another way. So the usage of drug combination might be more effective. Insufficient impact of betaadrenoblockers on central artrial pressure is linked to peripheral vasoconstriction. The drugs within this class having vasodilatory properties significantly reduce central aortic pressure.

The predictive value of vascular biomarkers such as pulse wave velocity (PWV), central arterial pressure (CAP), and augmentation index (AIx), obtained through pulse wave analysis (PWA) in resting conditions, has been documented in a variety of patient groups and populations. This allowed to make appropriate recommendations in clinical practice guidelines of several scientific societies. Due to advances in technologies, largely operator-independent methods are currently available for estimating vascular biomarkers also in ambulatory conditions, over the 24 h. According to the acceptable accuracy and reproducibility of 24-h ambulatory PWA, it appears to be a promising tool for evaluating vascular biomarkers in daily life conditions. This approach may provide an opportunity to further improve the early cardiovascular screening in subjects at risk. However, concerning the clinical use of PWA over the 24 h in ambulatory conditions at the moment, there is no sufficient evidence to support its routine clinical use. In particular, long-term outcome studies are needed to show the predictive value of 24-h PWV, CAP, and AIx values, provided by these devices, over and beyond peripheral blood pressure, and to answer the many technical and clinical questions still open. To this regard, the VASOTENS Registry, an international observational prospective study recently started, will help providing answers on a large sample of hypertensive patients recruited worldwide. [ABSTRACT FROM AUTHOR]

Endocrine disorders have multiple adverse effects on the development and function of cardiovascular system. In children with growth hormone deficiency (GHD) blood pressure measurement enables fast and simple assessment of the condition of blood vessels and heart. Values of central arterial pressure (CAP) more precisely than peripheral pressure predict cardiovascular disease and outcome. In addition, augmentation (augmentation index, AI) and amplification (pulse pressure amplification, PPA) indices indirectly reflect arterial stiffness and peripheral vascular resistance. The aim of this study was to analyze the various parameters of central blood pressure using a non-invasive method in juvenile patients with growth hormone deficiency (GHD) and to assess variability of the studied parameters during treatment with recombinant human growth hormone (rhGH). Results. The group with GHD before rhGH treatment presented significantly lower peripheral and central atrerial pressures (p <0.0009), as well as the value of the amplification index (p <0.02), than healthy children. Augmentation index was higher than in the control group (p <0.04). Patients with GHD treated with rhGH, compared to healthy children, revealed an increased heart rate (p <0.007) and lower central arterial pressure (p<0,04) with no statistically significant differences in other parameters. Vascular stiffness parameters showed favorable variation during the administration of growth hormone, with no statistical significance between groups. Conclusions. The immaturity of the cardiovascular system in children with GHD prior to rhGH treatment is characterized by low central arterial pressure value. The arterial stiffness indicators, AI and PPA, suggest an improvement in the vessels flexibility during the substitution therapy with rhGH. [ABSTRACT FROM AUTHOR]

A number of devices are available which noninvasively estimate central aortic blood pressure using a variety of approaches such as tonometry or oscillometry. In this position paper, we discuss how the central pressure waveform is generated and measured, how central pressure waveforms appear in health and disease, the predictive value of central blood pressure measurements, the effects of interventions on waveforms, and areas of future need in this field of clinical and research endeavor. [ABSTRACT FROM AUTHOR]

Introduction Invasive blood pressure monitoring is essential in liver transplant surgery due to expected major hemodynamic shifts. The use of central versus peripheral arterial access, however, is institution-dependent, which can affect clinical decisions regarding vasopressor therapy. Although there are studies that demonstrate inconsistencies based on arterial cannulation sites, few studies have compared femoral and radial artery blood pressures in patients undergoing liver transplant surgery. To our knowledge, there are no studies investigating the differences between continuous minute-to-minute femoral and radial artery measurements during all three phases of liver transplant surgery. Objective The main objective of this study was to evaluate for any differences between central and peripheral blood pressure measurements in liver transplant surgery and to assess for any correlation between vasopressor infusion dose and femoral-arterial pressure differences. Methods In this retrospective study, we reviewed and studied the data of 61 patients with American Society of Anesthesiologists (ASA) grade 4 who underwent liver transplant surgery at Loma Linda University Medical Center between January and December of 2019. All patients had both femoral and radial arterial lines placed for liver transplant surgery. Femoral and radial arterial blood pressure values were obtained continuously over 60 minutes in the pre-anhepatic phase, 45 minutes during the anhepatic phase, and 60 minutes into the neo-hepatic phase. Vasopressor infusion doses were also recorded for each patient during these time frames. Results This pilot study found statistically significant differences between the mean femoral and radial systolic blood pressure (SBP; p < 0.0001), diastolic blood pressure (DBP; p < 0.0001), and mean arterial pressure (MAP; p < 0.0001) during all phases of liver transplantation. The meanSBP and MAP differences between femoral and radial arteries were highest (femoral blood pressure reading higher than radial blood pressure measurements) in the late anhepatic and early neo-hepatic phases with SBP differences of 20.8 ± 0.8 mmHg and 22.8 ± 0.8 mmHg, respectively, and MAP differences of 10.0 ± 0.4 mmHg and 9.8 ± 0.4 mmHg, respectively. Higher vasopressor infusion doses were strongly associated with greater differences in femoral-radial SBP and MAP measurements (r = 0.69 for vasopressin, 0.68 for norepinephrine, and 0.68 for epinephrine; p < 0.0001) during the anhepatic phase. Conclusions Peripheral invasive blood pressure monitoring may result in underestimation of the central blood pressure, as was seen in all phases of liver transplantation. This may lead to excessive vasopressor use with potentially adverse effects. Although the cause for the difference between femoral and radial artery measurements is unclear, increasing vasopressor infusion dosages appears to contribute. Femoral artery blood pressure monitoring allows clinicians to interpret hemodynamic status and administer appropriate vasopressors more accurately., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2022, Kim et al.)

• Built a reconstruction model of central arterial pressure waveform based on deep learning to obtain more robust features. • A network model combining parallel CNN and Bi-LSTM is proposed for reconstruction of central arterial pressure. • Aiming to avoid the over-fitting problem of the CNN-BiLSTM model caused by a small number of invasive patient samples, a data augmentation was proposed to increase the diversity of training samples. • Through parallel experiments on the same data set, explore the effects of different depth neural networks in reconstructing of CAP waveforms. Central arterial pressure is an important physiological indicator of the human cardiovascular system. Its noninvasive, continuous and accurate reconstruction and monitoring are essential to the evaluation, prevention and treatment of cardiovascular system diseases. However, it is difficult to improve the accuracy of noninvasive central arterial pressure reconstruction by traditional methods, which limits its clinical application and promotion. In this study, a model for reconstructing central artery pressure from radial arterial pressure waveforms based on a convolutional neural network and bi-directional long short-term memory (CNN-BiLSTM) was proposed. Central aortic pressure waveforms and radial arterial pressure waveforms were measured invasively before and after medication in 62 patients to evaluate the CNN-BiLSTM model for reconstructing central artery pressure. The CNN-BiLSTM model was compared with two traditional methods (autoregressive exogenous (ARX) and N-point moving average method (NPMA)) and four deep learning models (LSTM, BiLSTM, LSTM-BiLSTM and CNN-LSTM) in the mean absolute error (MAE), root mean square error (RMSE) and Spearman correlation coefficient (SCC). Experimental results showed that the proposed model achieved the best results on waveform reconstruction (MAE: 2.18 ± 0.13 mmHg, RMSE: 2.95 ± 0.16 mmHg). At the same time, a good reconstruction effect was obtained in the central arterial systolic pressure (RMSE: 3.34 ± 0.91 mmHg) and diastolic blood pressure (RMSE: 2.41 ± 0.18 mmHg). Therefore, the reconstruction model based on CNN-BILSTM is a potential method for noninvasive continuous monitoring of central arterial pressure. [ABSTRACT FROM AUTHOR]

Our purpose is to review noninvasive methods for measuring central arterial pressure. Indices of central arterial pressure measured from central aortic and peripheral arterial waveforms have shown value in predicting cardiovascular events and death, as well as in guiding therapeutic management. This article reviews noninvasive techniques of measuring central arterial pressure that have been validated against intra-arterial pressure. This paper explains methods to derive central (aortic and carotid) pressure from radial and brachial sites. It focuses on specific issues of brachial calibration applied to carotid pressure waveforms, which were regarded as a surrogate of aortic pressures used in three major studies (Framingham, Asklepios, and Australian National Blood Pressure 2 studies). We explain why radial-based methods are superior to carotid-based methods for estimating central pressure. Physiological principles of pressure measurement need be satisfied to ensure accurate recording. [ABSTRACT FROM AUTHOR]

Objective: To examine the effects of intravenous insulin and acute hypoglycemia on arterial wall stiffness and central hemodynamic responses in adults with and without type 1 diabetes. Research Design and Methods: In 30 young male volunteers [10 nondiabetic (Group 1); 10 with type I diabetes, <5 yr duration (Group 2); 10 with type 1 diabetes, >15 yr duration (Group 3)], intravenous insulin was administered to provoke an acute autonomic reaction (R) to hypoglycemia. Heart rate, peripheral blood pressure, and pulse wave analysis (radial artery) were monitored. Augmentation index (AIx), a measure of arterial wall stiffness and wave reflection, and central arterial pressure were recorded. Results: At baseline, no significant differences were observed between Groups 1 and 2 in either AIx or in central arterial pressure, but in Group 3, both measures were significantly higher. All three groups exhibited similar responses to intravenous infusion of insulin and to hypoglycemia: AIx fell progressively from baseline to R, peripheral systolic blood pressure increased, and central systolic pressure decreased. Conclusion: Compared with age- and sex-matched nondiabetic controls, people who had type 1 diabetes for a long duration had increased stiffness of vessel walls. The opposing responses in peripheral and central systolic pressures during hypoglycemia may be related to the reduction in AIx, which causes diminished amplification of the systolic pressure wave. Changes in AIx are probably mediated by a direct action of insulin on arterial endothelium, or changes in heart rate. These functional changes may contribute to the increased cardiovascular morbidity that is associated with type I diabetes of long duration. [ABSTRACT FROM AUTHOR]

Assessment of dynamic cerebral autoregulation (CA) requires continuous recording of arterial blood pressure (ABP). In humans, noninvasive ABP recordings with the Finapres device have often been used for this purpose. We compared estimates of dynamic CA derived from Finapres with those from invasive recordings in the aorta. Measurements of finger noninvasive ABP (Finapres), intra-aortic ABP (Millar catheter), surface ECG, transcutaneous CO2, and bilateral cerebral blood flow velocity (CBFV) in the middle cerebral arteries were simultaneously and continuously recorded in 27 patients scheduled for percutaneous coronary interventions. Phase, gain, coherence, and CBFV step response from both the Finapres and intra-arterial catheter were estimated by transfer function analysis. A dynamic autoregulation index (ARI) was also calculated. For both hemispheres, the ARI index and the CBFV step response recovery at 4 s were significantly greater for the Finapres-derived estimates than for the values obtained from aortic pressure. The transfer function gain for frequencies <0.1 Hz was significantly smaller for the Finapres estimates. The phase frequency response was significantly greater for the Finapres estimates at frequencies >0.1 Hz, but not at lower frequencies. The Finapres gives higher values for the efficiency of dynamic CA compared with values derived from aortic pressure measurements, as indicated by biases in the ARI index, CBFV step response, gain, and phase. Despite the significance of these biases, their relatively small amplitude indicates a good level of agreement between indexes of CA derived from the Finapres compared with corresponding estimates obtained from invasive measurements of aortic ABP. [ABSTRACT FROM AUTHOR]

Brain 18 F-FDG PET imaging is useful to characterize accelerated brain aging at a pre-symptomatic stage. This study aims to examine the interactions between brain glycolytic metabolism and hemodynamic parameters in different age groups. Methods : A total of 72 patients (from 23 to 88 years of age, 38 women) without any cerebral diseases but with available cardiac, arterial peripheral, and central blood pressure measurements as well as arterial stiffness parameters obtained from brachial pressure and applanation tonometry and a brain 18 F-FDG PET scan were prospectively included into this study. Quantitative voxel-to-voxel analyses were carried out to test for negative associations between brain glycolytic metabolism and individual hemodynamic parameters (p-voxel of <0.001 for the whole population and <0.005 for age groups). Results : The heart rate parameter of the whole population showed the most extensive associations with brain metabolism (15,857 mm 3 , T-score: 5.1), predominantly affecting the frontal and temporal regions (69% of the volume). Heart rate for the younger age group, systolic and pulse pressure for the 41-60-year-old group, and diastolic pressure for the older group were most extensively associated with brain metabolism and mainly involved the fronto-temporal lobes (respective involvement of 52.8%, 60.9%, and 65.5%) which are also the regions implicated in accelerated brain aging. Conclusion : This cross-sectional prospective study identified extensive associations between cerebral metabolism and hemodynamic parameters, indicating common aging mechanisms. Heart rate throughout adult life, systolic and pulse pressure parameters around middle age, and diastolic pressure parameters in older patients, suggest the existence of potentially therapeutic targets to prevent accelerated brain aging., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Zimmermann, Joly, Schoepfer, Doyen, Roch, Grignon, Salvi, Marie, Benetos and Verger.)

Background: Radial arterial pressure underestimates the pressure in the aorta in several clinical situations. A central-to-radial pressure gradient was attributed to intense vasodilation. The aim of this study was to evaluate the accuracy of radial pressure monitoring during controlled hypotension achieved with profound arterial vasodilation.Methods: Ten patients with ASA physical status I and II undergoing maxillofacial surgery under general anesthesia were enrolled in this prospective study. Radial and femoral arteries were cannulated and connected to a pressure monitoring system. Controlled hypotension was achieved with an infusion of nicardipine titrated to maintain MAP between 50 and 60 mmHg. Simultaneous radial and femoral systolic, mean and diastolic arterial pressures were recorded before, during and after controlled hypotension. Results were expressed as mean +/- SD. Concomitant radial and femoral pressures were compared by a paired Student's test, P < 0.05 being significant.Results: In all, 150 sets of arterial pressures measurement were obtained. There were no statistically significant differences between radial and femoral arterial pressures measured before, during or after controlled hypotension.Conclusion: Radial arterial pressure is an accurate measure of central arterial pressure during controlled hypotension achieved with arterial vasodilation. [ABSTRACT FROM AUTHOR]

Objective: We assessed the consistency of noninvasive and invasive measurements of central arterial pressure (CAP) and the difference between peripheral brachial artery pressure and CAP in patients with chronic kidney disease (CKD) undergoing versus not undergoing hemodialysis., Methods: This single-center cross-sectional study was performed from May to December 2018. The patients were divided into a control group (n = 50), CKD group (stages 3-5, n = 50), and dialysis group (n = 20), and all underwent measurement of peripheral humeral arterial pressure and noninvasive and invasive measurement of CAP. Group differences and correlations between CAP and peripheral arterial pressure were assessed., Results: The consistency between noninvasive and invasive CAP was better in the control and CKD groups than in the dialysis group. In the dialysis group, the noninvasive equipment underestimated the actual CAP. The CAP was close to the peripheral brachial artery pressure in the dialysis group, while the CAP was significantly lower than the peripheral brachial artery pressure in the control and CKD groups., Conclusion: Noninvasive equipment underestimates the actual CAP in patients undergoing dialysis and should be used with caution. The difference between the peripheral arterial pressure and CAP was smaller in patients undergoing dialysis than in patients with CKD and controls.

Purpose: Axillary arterial cannulation for blood pressure monitoring has been reported in adults since 1973. Reported failure rates using palpation landmarks are high. This report describes a needle-guided ultrasound technique for axillary arterial line placement in critically ill patients., Methods: A retrospective review of all patients requiring axillary arterial cannulation attempts with ultrasound-assisted needle guidance for hemodynamic monitoring was performed from July 2010 to June 2016 at a single institution., Results: One hundred fifty nine (159) cannulation attempts were performed in 155 patients. The overall success rate was 97%, with a first pass success rate of 84%. Inexperienced operators performed 49% of procedures under direct faculty supervision, and had a 99% success rate, which was not different from experienced operators. Almost 20% of patients had moderate-to-severe coagulopathy (platelets<50k/uL, INR>2.0 or PTT>60s). Complications reported included the following: nonfunctioning of catheter (6%) and hematoma (6%). Ischemia was noted in 2 patients (1%), but only one was attributed to the arterial catheter., Conclusions: Use of the needle-guided ultrasound assisted approach for axillary arterial line placement is easily teachable and can be used to promote safe and successful placement of axillary arterial lines for novice learners., (Copyright © 2017 Elsevier Inc. All rights reserved.)