Pulse wave analysis using the Mobil-O-Graph, Arteriograph and Complior device: a comparative study.

PURPOSE: Pulse wave velocity (PWV) is a marker of arterial stiffness with major prognostic value. We compared Arteriograph and Complior devices with the Mobil-O-Graph for assessment of PWV and central systolic blood pressure (cSBP). MATERIALS AND METHODS: We studied 316 consecutive subjects (age: 55 ± 14 years). For each individual, we measured PWV and cSBP with Arteriograph, Complior and Mobil-O-Graph and compared the readings. Differences in values among three devices were calculated for each measurement. We used Bland-Altman analysis, intraclass correlation coefficient (ICC) and coefficient of variation (CV). RESULTS: Bland-Altman analysis indicated a mean difference for PWV: i.0.5 m/s (limits of agreement -1.4-2.4) between Complior and Mobil-O-Graph, ii.0.6 m/s (limits of agreement -1.4-2.6) between Arteriograph and Mobil-O-Graph. cSBP mean difference was 3.8 mmHg between Complior and Mobil-O-Graph (limits of agreement -12.5-20.1) and 9.2 mmHg between Arteriograph and Mobil-O-Graph (limits of agreement -7.6-26). ICC for PWV was 0.86 between Arteriograph and Mobil-O-Graph, 0.87 between Complior and Mobil-O-Graph and for cSBP 0.92 and 0.91 respectively. CV for PWV was 9.5% between Arteriograph and Mobil-O-Graph, 8.8% between Complior and Mobil-O-Graph. Respective values for cSBP were 6.8% and 5.1%. CONCLUSION: Our study shows acceptable agreement among the three devices regarding pulse wave analysis markers though Mobil-O-Graph appears to underestimate the values of these markers. Further studies are needed to explore the agreement between the 3 devices in various clinical settings and patient populations.

Hypertension-Mediated Organ Damage In Young Patients With First-Diagnosed And Never Treated Systolic Hypertension.

OBJECTIVE: Early onset of untreated arterial hypertension is associated with an increased risk for cardiovascular (CV) diseases. The evaluation of hypertension-mediated organ damage (HMOD) helps estimating CV risk. We investigated the incidence of HMOD in young first, diagnosed and nevertreated patients with systolic arterial hypertension (SH) to identify high CV-risk patients based on the presence of HMOD. METHODS: CV risk factors [smoking, obesity (body mass index, BMI)], hyperlipidemia and 5 HMODs [arterial stiffness (pulse wave velocity, PWV), left ventricular diastolic dysfunction [(DD (E/Ea)], cardiac hypertrophy (left ventricular mass index, LVMI), coronary artery microcirculation (CFR), and carotid intima-media thickness (cIMT)] were evaluated before treatment initiation in 220 patients, aged ≤50 years [median (interquartile range, IQR) age=43(38-47)], with SH diagnosed by ambulatory blood pressure monitoring (24-h ABPM). RESULTS: Smoking (40%) and obesity [median (IQR) BMI=30(26-32) kg/m2](40%) were found in young hypertensives. HMOD was found in 50% of hypertensives (10% had ≥2 HMOD). The most prevalent HMODs were increased by cIMT (32%) and PWV (19%), LVH (9%), impaired CFR (6%) and DD (1%). Only PWV (beta=0.27, p<0.001) and LVMI (beta=0.41, p<0.001) were associated with systolic BP burden. In a subgroup analysis, patients with ≥2 HMOD were older with increased office BP and 24- h ABPM, impaired lipid profile, and increased LVMI, PWV, CFR, and cIMT compared with the rest of the hypertensives. CONCLUSION: The presence of ≥2 of the studied HMOD (PWV, LVMI, cIMT, E/Ea, CFR) in young hypertensives characterizes a "high-risk population". Arterial stiffness represents the predominant HMOD and in the whole population and "high-risk population".

Differential effects of heat-not-burn and conventional cigarettes on coronary flow, myocardial and vascular function.

We compared the effects of Heat-not-Burn cigarette (HNBC) to those of tobacco cigarette (Tcig), on myocardial, coronary and arterial function as well as on oxidative stress and platelet activation in 75 smokers. In the acute study, 50 smokers were randomised into smoking a single Tcig or a HNBC and after 60 min were crossed-over to the alternate smoking. For chronic phase, 50 smokers were switched to HNBC and were compared with an external group of 25 Tcig smokers before and after 1 month. Exhaled carbon monoxide (CO), pulse wave velocity (PWV), malondialdehyde (MDA) and thromboxane B2 (TxB2) were assessed in the acute and chronic study. Global longitudinal strain (GLS), myocardial work index (GWI), wasted myocardial work (GWW), coronary flow reserve (CFR), total arterial compliance (TAC) and flow-mediated dilation (FMD) were assessed in the chronic study. Acute HNBC smoking caused a smaller increase of PWV than Tcig (change 1.1 vs 0.54 m/s, p < 0.05) without change in CO and biomarkers in contrast to Tcig. Compared to Tcig, switching to HNBC for 1-month improved CO, FMD, CFR, TAC, GLS, GWW, MDA, TxB2 (differences 10.42 ppm, 4.3%, 0.98, 1.8 mL/mmHg, 2.35%, 19.72 mmHg%, 0.38 nmol/L and 45 pg/mL respectively, p < 0.05). HNBCs exert a less detrimental effect on vascular and cardiac function than tobacco cigarettes.Trial registration Registered on https://clinicaltrials.gov/ (NCT03452124, 02/03/2018).

Sex-related associations of high-density lipoprotein cholesterol with aortic stiffness and endothelial glycocalyx integrity in treated hypertensive patients.

Smoking, a well-recognized major cardiovascular (CV) risk factor, impairs endothelial function and increases aortic stiffness which indicates subclinical organ damage in hypertensive patients. Loss of endothelial glycocalyx (EG) integrity, as part of the endothelium, represents endothelial dysfunction. The authors aimed to investigate the role of increased HDL cholesterol levels (HDL-C), which usually are considered protective against CV disease, in aortic stiffness and endothelial integrity in middle-aged treated hypertensive patients regarding smoking habit. The authors studied 193 treated hypertensive patients ≥40 years (mean age = 61±11 years, 58% females), divided in four groups regarding sex and smoking. Increased perfusion boundary region of the 5-9 µm diameter sublingual arterial microvessels (PBR5-9 ) was measured as a noninvasive accurate index of reduced EG thickness. Aortic stiffness was estimated by carotid-femoral pulse wave velocity (PWV). In the whole population, an inverse weak relationship was found between HDL-C and PWV (r = -.15, P = .03) and PBR5-9 (ρ = -.15, P = .03). Moreover, HDL-C was negatively related to PBR5-9 in males (r = -.29, P = .008) either smokers (r = -.35, P < .05) or non-smokers (r = -.27, P < .05) and PWV in female non-smokers (r = -.28, P = .009). In a multiple linear regression analysis, using age, weight, smoking, HDL-C, and LDL-C as independent variables, we found that HDL-C independently predicts PWV in the whole population (ß = -.14, P = .02) and PBR5-9 in male hypertensive patients (ß = -.28, P = .01). Higher HDL-C levels are associated with reduced aortic stiffness in hypertensive patients, while they protect EG and subsequently endothelial function in middle-aged, treated hypertensive male patients (either smokers or not).

Measurement of central augmentation index by three different methods and techniques: Agreement among Arteriograph, Complior, and Mobil-O-Graph devices.

Wave reflection at central arteries consists of a major component of left ventricular afterload. Central augmentation index (AIx) is the most widely used surrogate of wave reflection. Recent technological developments now provide the ability to obtain, non-invasively, aortic, or carotid pressure waves and measure AIx based on various algorithms of pulse wave analysis. The aim of this study was to compare AIx measurements performed by the Arteriograph, Complior, and Mobil-O-Graph apparatuses. Recordings by each device in randomized order were performed with 5-minute interval at 211 individuals (age 55.1 ± 14.1 years, 67.8% males) who underwent diagnostic cardiovascular assessment. All measurements were obtained at the supine position, and AIx was calculated using the formula AIx = 100 × (Augmentation pressure)/(Pulse Pressure). Bland-Altman analysis was performed. Mean difference (bias) ± one standard deviation of difference (with limits of agreement) of AIx between different devices was as follows: (a) Mobil-O-Graph vs Complior: -2.1 ± 14.8% (-31.1% to 26.9%), (b) Arteriograph vs Complior: 12.9 ± 14.6% (-15.7% to 41.5%), and (c) Mobil-O-Graph vs Arteriograph: -10.8 ± 16.9% (-43.9% to 22.3%). The three examined devices exerted significant differences in central AIx estimation which makes the three devices non-interchangeable for wave reflection assessment. However, the Mobil-O-Graph device showed the highest agreement (lowest bias) with the Complior system as regards to the AIx measurement.