Non-dipping Blood Pressure Pattern Research Articles

The association between blood pressure variability and renal damage in patients with primary aldosteronism.

This research examines the association between blood pressure variability (BPV) and renal damage in a cohort of 129 primary aldosteronism (PA) patients, employing ambulatory blood pressure monitoring (ABPM) for comparative analysis with individuals diagnosed with essential hypertension (EH). The study reveals that PA patients exhibited significantly elevated levels of cystatin C and urine microalbumin/creatinine ratio (UACR). Additionally, a higher prevalence of non-dipping blood pressure patterns in PA patients suggests an increased risk of circadian blood pressure regulation disturbances. Notably, while most BPV indices were comparable between the two groups, the standard deviation of 24-h weighted diastolic blood pressure was markedly lower in the PA cohort, distinguishing it as a unique variable. Through multiple linear regression analysis, the duration of hypertension, angiotensin II concentrations, and daytime systolic blood pressure standard deviation emerged as significant determinants of estimated glomerular filtration rate (eGFR) in PA patients. Furthermore, UACR was significantly influenced by variables including the 24-h weighted standard deviation (wSD) of systolic BP, glycosylated hemoglobin levels, nocturnal systolic BP peaks, aldosterone-renin ratio (ARR), and total cholesterol, with the most pronounced association observed with the 24-h wSD of systolic BP (β=0.383).The study also found significant correlations between the 24-h wSD of systolic BP, ARR, HbA1c, serum potassium levels, and 24-h urinary microalbumin, underscoring the critical role of the 24-h wSD of systolic BP (β=0.267). These findings underscore the imperative of an integrated management strategy for PA, addressing the intricate interconnections among metabolic abnormalities, blood pressure variability, and renal health outcomes.

Non-dipping blood pressure pattern is associated with cardiovascular events in a 21-year follow-up study.

Non-dipping blood pressure (BP) pattern is a predictor for cardiovascular (CV) events and mortality. We evaluated dipping status change and its association with incidence of non-fatal CV events in middle-aged subjects. The OPERA study was carried out during the years 1991-1993, with a follow-up study 21.7 years later. In this study, we included 452 participants with 24-h ambulatory BP measurements (ABPM) available in both surveys. The study population was divided into four groups according to the dipping pattern change: dipping-dipping (n = 152/33.6%), dipping-non-dipping (n = 198/43.8%), non-dipping-dipping (n = 20/4.4%), and non-dipping-non-dipping (n = 82/18.1%). Sixty-five participants experienced a CV event (14.4%) during the 21.7 (SD 0.8) years of follow-up. The incidence of events was highest (28%) in the non-dipping-non-dipping group, and lowest (6.6%) in the dipping-dipping group (p < 0.001). In Cox regression analyses the covariates were age, sex, total cholesterol, hypertension and use of antihypertensive medication, systolic office BP and ambulatory mean or nighttime systolic BP, as well as the change in the variables during the follow-up period. After adjustments, the association of the non-dipping-non-dipping pattern with CV events compared with the dipping-dipping pattern remained significant (HR 4.01; 95% CI 1.89-8.67, p < 0.001). In summary, non-dipping-non-dipping pattern was associated with non-fatal CV events in the long term, and the effect was independent of the conventional risk factors including office and ambulatory BP levels.

The Effect of Night Shift on Blood Pressure in Healthcare Workers.

Individuals across all age groups may experience elevated blood pressure due to a combination of internal and environmental factors. Factors influencing arterial pressure include diet, stress, sleep patterns, and lifestyle. This study aims to investigate the susceptibility to high blood pressure among occupational groups working night shifts. The study included healthcare worker participants who had at least six night shifts per month. A control group consisted of participants performing the same roles during daytime. Participants with chronic diseasesor those taking blood pressure-affecting medication were excluded. Holter recordings were made over a minimum of 48 hours, including both a free day and a work day. The study involved 114 participants-55 in the study group and 59 in the control group. Statistically significant differences were noted between the groups in the daylight-night ratios of systolic and diastolic pressures, with P values of 0.006 and 0.005, respectively. The systolic daylight-night difference was -5.7 ± 5.5% in the study group and -9.0 ± 7.0% in the control group. The diastolic daylight-night difference was -7.9 ± 9.6% in the study group and -12.7 ± 8.2% in the control group. Occupations with nighttime work schedules are often associated with non-dipping blood pressure patterns due to sleep disturbances. It is crucial to consider the blunted dipping of blood pressure induced by night shift work when assessing and monitoring hypertension and related medical conditions.

Ambulatory blood pressure and risk of heart failure: a mini-review

The aim of this mini-review is to report current knowledge about the association between ambulatory blood pressure and risk of heart failure in hypertension. We conducted a literature search through PubMed, Web of science and Cochrane Library by using terms such as ambulatory blood pressure, 24-hour blood pressure, daytime blood pressure, nighttime blood pressure, hypertension, heart failure. We identified 4 studies including 7891 patients who developed 260 cases of heart failure during the follow-up. The evaluation of published studies indicates that ambulatory blood pressure is superior to clinic blood pressure in predicting the occurrence of heart failure. Particularly, it has been reported that 24-hour blood pressure values, nighttime nondipping blood pressure pattern and ambulatory resistant hypertension are associated with increased risk of heart failure above clinic blood pressure. Nevertheless, there are still few data in the literature on this topic. Therefore, further studies are needed to broaden our knowledge on this matter to improve our therapeutic approach to prevent HF in hypertensive patients.

NON-DIPPING BLOOD PRESSURE PATTERNS AND ASSOCIATED TARGET ORGAN DAMAGE IN ELDERLY HYPERTENSIVE PATIENTS

Background: Older adults with hypertension face an increased risk of adverse cardiovascular outcomes, emphasizing the importance of target organ damage (TOD) in their treatment. The non-dipping blood pressure (BP) pattern, characterized by inadequate reduction of nocturnal BP (less than 10-20%), is associated with a higher likelihood of TOD in individuals with essential hypertension. This study aimed to examine the characteristics of non-dipping BP patterns among elderly individuals with essential hypertension and evaluate their associations with TOD. Methods: A descriptive cross-sectional study was conducted, involving 96 patients aged ≥60 years (mean age 70.9 ± 7.9 years, 35.4% male). Participants underwent routine clinical and laboratory assessments, including clinic and 24-hour ambulatory blood pressure monitoring. TOD was defined as the presence of left ventricular (LV) hypertrophy, renal impairment, or proteinuria. Results: Non-dipping patterns for systolic and diastolic BP were observed in 36 (36.5%) and 41 (42.7%) patients, respectively. TOD was present in 61 (63.5%) patients. Non-dipping systolic patients exhibited lower rates of diabetes mellitus (37.1% vs. 81.3%, p=0.006), dyslipidemia (68.6% vs. 100%, p=0.011), higher levels of creatinine (median 85.6, interquartile range [IQR] 72.1-101 vs. 70.8, IQR 62.4-78.3 µmol/l, p=0.012), and higher LV mass index (median 106.6, IQR 96.4-148.4 vs. 93.7, IQR 72.9-111.5 g/m2, p=0.028) compared to dipping patients. Non-dipping diastolic patients had a lower prevalence of dyslipidemia (73.2% vs. 100%, p=0.048) and a lower body mass index (median 23, IQR 19.73-25 vs. 25.26, IQR 22.54-27.17 kg/m2, p=0.013). Multivariate analysis, after adjusting for cardiovascular risk, showed that non-dipping patterns (both systolic and diastolic) were associated with TOD (odds ratio 7.21; 95% confidence interval 1.47-35.36, p=0.015). Conclusion. Our study underscores the significant association between non-dipping blood pressure patterns and TOD in elderly individuals with essential hypertension. The notable prevalence of non-dipping patterns emphasizes the clinical importance of monitoring and managing these patterns in clinical practice.

Cardiovascular rhythmicity in overweight and obese children.

Obesity is thought to play a role in the disruption of cardiac rhythmicity in obese children, but this is mostly an unexplored field of investigation. We aimed to evaluate the impact of overweight and obesity on circadian and ultradian cardiovascular rhythmicity of prepubertal children, in comparison with normal weight counterparts. We performed a cross sectional study of 316 children, followed in the birth cohort Generation XXI (Portugal). Anthropometrics and 24-hour ambulatory blood pressure were measured and profiles were examined with Fourier analysis for circadian and ultradian blood pressure (BP) and heart rate (HR) rhythms. Overweight/obese children presented more frequently a non-dipping BP pattern than normal weight counterparts (31.5% vs. 21.6%, p = 0.047). The prevalence of 24-hour mean arterial pressure (MAP) and 8-hour HR rhythmicity was significantly lower in obese children (79.3% vs. 88.0%, p = 0.038 and 33.3% vs. 45.2%, p = 0.031, respectively). The prevalence of the remaining MAP and HR rhythmicity was similar in both groups. No differences were found in the median values of amplitudes and acrophases of MAP and HR rhythms. The alterations found in rhythmicity suggest that circadian and ultradian rhythmicity analysis might be sensitive in detecting early cardiovascular dysregulations, but future studies are needed to reinforce our findings and to better understand their long-term implications.

Metabolipidomic Analysis in Patients with Obstructive Sleep Apnea Discloses a Circulating Metabotype of Non-Dipping Blood Pressure.

A non-dipping blood pressure (BP) pattern, which is frequently present in patients with obstructive sleep apnea (OSA), confers high cardiovascular risk. The mechanisms connecting these two conditions remain unclear. In the present study we performed a comprehensive analysis of the blood metabolipidome that aims to provide new insights into the molecular link between OSA and the dysregulation of circadian BP rhythmicity. This was an observational prospective longitudinal study involving adults with suspected OSA who were subjected to full polysomnography (PSG). Patients with an apnea-hypopnea index ≥ 5 events/h were included. Fasting plasma samples were obtained the morning after PSG. Based on the dipping ratio (DR; ratio of night/day BP values) measured via 24 h ambulatory BP monitoring, two groups were established: dippers (DR ≤ 0.9) and non-dippers (DR > 0.9). Treatment recommendations for OSA followed the clinical guidelines. Untargeted metabolomic and lipidomic analyses were performed in plasma samples via liquid chromatography-tandem mass spectrometry. Non-dipper patients represented 53.7% of the cohort (88/164 patients). A set of 31 metabolic species and 13 lipidic species were differentially detected between OSA patients who present a physiologic nocturnal BP decrease and those with abnormal BP dipping. Among the 44 differentially abundant plasma compounds, 25 were putatively identified, notably glycerophospholipids, glycolipids, sterols, and fatty acid derivates. Multivariate analysis defined a specific metabotype of non-dipping BP, which showed a significant dose-response relationship with PSG parameters of OSA severity, and with BP dipping changes after 6 months of OSA treatment with continuous positive airway pressure (CPAP). Bioinformatic analyses revealed that the identified metabolipidomic profile was found to be implicated in multiple systemic biological pathways, with potential physiopathologic implications for the circadian control of BP among individuals with OSA.

Association between non-dipping blood pressure pattern and different glucometabolic profile during oral glucose tolerance test

It is known that, a not physiological blood pressure (BP) circadian pattern has been associated with increased risk of organ damage and cardiovascular (CV) event. The aim of this study was to assess the association between circadian BP pattern and glucometabolic phenotypes occurring after oral glucose tolerance test (OGTT). We recruited 810 hypertensive Caucasian patients. All participants underwent to OGTT, laboratory test and 24-h ambulatory BP monitoring (ABPM). The analysis of collected data allowed classifying patients based on nocturnal BP profiles into four categories: dippers, non-dippers, extreme dippers, and reverse dippers. Considering the dipping pattern, the proportion of non-dippers in normal glucose tolerance patients with 1-h glucose ≥ 155 mg/dL (NGT ≥ 155) (36.4%) was higher than NGT < 155 (29.6%) and impaired glucose tolerance (IGT) (34.8%), but lower than type 2 diabetes group (T2DM) (52.6%) (p = 0.001). The proportion of dippers was lower in NGT ≥ 155 (47%) and T2DM (34.6%), when compared with NGT < 155 (53.8%) and IGT (51.2%) (p = 0.017). From logistic regression analysis, 1-h glucose ≥ 155 increased the risk of a pathological nocturnal drop in BP by 74%, (OR = 1.740, 95% CI 1.254–2.415, p < 0.0001). In addition, the improvement in 1 unit of Matsuda was responsible for a 3.5% risk decrease (OR = 0.965, 95% CI 0.958–0.971, p < 0.0001), while e-GFR determined a 0.9% risk reduction of nocturnal BP drop (OR = 0.991, 95% CI 0.984–0.999, p = 0.020). Our data demonstrated the existence, in newly diagnosed hypertensive patients, of an association between circadian BP profile and altered glycemic response during OGTT, in particular NGT ≥ 155 subjects are associated with a non-dipper BP pattern, this is clinically relevant because may explain, at least in part, the increased CV risk in this setting of patients.

The Relationship between Nocturnal Dipping Status, Morning Blood Pressure Surge, and Hospital Admissions in Patients with Systolic Heart Failure.

Hypertension is a known risk factor for developing heart failure. However, there is limited data to investigate the association between morning blood pressure surge (MBPS), dipping status, echocardiographic parameters, and hospital admissions in patients with systolic heart failure. To evaluate the relationship between morning blood pressure surge, non-dipper blood pressure pattern, echocardiographic parameters, and hospital admissions in patients with systolic heart failure. We retrospectively analyzed data from 206 consecutive patients with hypertension and a left ventricular ejection fraction below 40%. We divided the patients into two groups according to 24-hour ambulatory blood pressure monitoring (ABPM) results: dippers (n=110) and non-dippers (n=96). Morning blood pressure surge was calculated. Echocardiographic findings and hospital admissions during follow-up were noted. Statistical significance was defined as p < 0.05. The study group comprised 206 patients with a male predominance and mean age of 63.5 ± 16.1 years. The non-dipper group had significantly more hospital admissions compared to dippers. There was a positive correlation between MBPS and left atrial volume index (r=0.331, p=0.001), the ratio between early mitral inflow velocity and flow propagation velocity (r= 0.326, p=0.001), and the ratio between early mitral inflow velocity and mitral annular early diastolic velocity (E/Em) (r= 0.314, p=0.001). Non-dipper BP, MBPS, and E/Em pattern were found to be independently associated with increased hospital admissions. MBPS is associated with diastolic dysfunction and may be a sensitive predictor of hospital admission in patients with systolic heart failure.

The relationship between the prognostic nutritional index and non-dipping blood pressure pattern in patients with newly diagnosed hypertension

Aims: It has been suggested that immuno-nutritional status may play a role in blood pressure (BP) variations. This study aimed to investigate whether prognostic nutritional index (PNI) values differ between normotensive individuals and patients with newly diagnosed untreated hypertension (NDHT) and to clarify the relationship between the PNI and circadian BP patterns in NDHT patients.&#x0D; Methods: This retrospective study included 328 adult participants, comprising 164 NDHT patients and 164 normotensive individuals. The non-dipper BP pattern (NDP) was defined as a nighttime decline in BP of less than 10%. The PNI was calculated using the following formula: PNI=([10 × serum albumin (g/dL)] + [0.005 × total lymphocyte count]).&#x0D; Results: The mean PNI value was lower in the NDHT group than the normotensive group (53.6±6.1 vs. 58.2±5.3, p

The relationship between the systemic immune-inflammation index and reverse-dipper circadian pattern in newly diagnosed hypertensive patients.

Although hypertension is considered high intravascular pressure, impairing circadian blood pressure (BP) has been shown to potentially contribute to poor clinical outcomes. Systemic immune-inflammation index (SII), based on platelet, neutrophil, and lymphocyte counts, has been established as a strong prognostic marker in cardiovascular disease. The role of inflammation in the pathogenesis of hypertension is a well-known issue and inflammatory markers are associated with BP variability. We aimed to investigate whether there is a relationship between circadian BP changes and SII in newly diagnosed hypertensive patients. The study population consisted of 196 newly diagnosed hypertensive patients without LVH. In total, 76 (38%) patients had a dipper BP pattern, 60 (31%) patients had a non-dipper BP pattern, and 60 (31%) patients had a reverse-dipper BP pattern. SII was calculated according to Multivariate logistic regression analysis revealed SII and HDL-C as an independent predictors of reverse-dipper circadian pattern in newly diagnosed hypertensive patients. The cut-off value of the SII for reverse-dipper hypertension in a ROC curve analysis was>639.73with 63.3% sensitivity and 84.2% specificity. Our study showed that the SII level was higher in the reverse-dipper hypertension patient group than in the dipper and non-dipper hypertension groups. Furthermore, SII was an independent predictor of newly diagnosed reverse-dipper hypertensive patients. The high SII value in newly diagnosed hypertensive patients can be used as an early warning parameter to identify reverse-dipper hypertension patients.

EVALUATION OF DIAGNOSTIC ACCURACY OF NOCTURNAL HOME BP MONITORING IN HEMODIALYSIS PATIENTS: A PILOT STUDY

Objective: A unique advantage of ambulatory blood pressure monitoring (ABPM) is that this technique enables the assessment of blood pressure (BP) during the period of sleep, facilitating the diagnosis of nocturnal hypertension. This study aimed to compare ABPM with home BP monitoring (HBPM) performed with a novel device that is designed to obtain daytime and also automated nighttime BP recordings in the assessment of nocturnal hypertension and detection of non-dipping BP pattern among patients on hemodialysis. Design and method: Within a period of 2 weeks, 70 stable patients on thrice-weekly hemodialysis underwent assessment of BP with 2 methods: (i) 44-hour interdialytic ABPM (20-min intervals; Microlife WatchBP O3 device) and (ii) HBPM (duplicate morning and evening BP recordings for 7 days and 3 BP recordings per night for 3 nights over the 3-day interdialytic interval; Microlife WatchBP Home N). Results: The mean age of the patients was 65.3 (±13.3) years; 45 (64%) were males, and 62 (88.7%) were receiving antihypertensive therapy. The average ambulatory daytime and nighttime SBP/DBP were 122.8±15/68.7±10.5 mmHg and 117.2±16.5/63.4±10.2 mmHg, respectively. The mean [95% confidence interval (CI)] difference between home daytime SBP and ambulatory daytime SBP was 8.61 (6.1, 11.2) mmHg. Similarly, the mean (95% CI) difference between home nighttime SBP and ambulatory nighttime SBP was 5.94 (3.5, 8.4) mmHg. In receiver-operating-characteristics (ROC) analysis, the technique of HBPM provided high accuracy for the detection of an average ambulatory daytime SBP equal or higher than 135 mmHg [area under the curve (AUC): 0.934; 95% CI: 0.871-0.996] as well as for the detection of an average ambulatory nighttime SBP equal or higher than 120 mmHg (AUC: 0.876; 95% CI: 0.794-0.957). Of the overall population, 44 patients (63%) were classified as non-dippers by ABPM and 42 (60%) by HBPM. There was acceptable agreement between these 2 techniques in the identification of patients with a non-dipper BP pattern (77%, k-coefficient = 0.324). Conclusions: The present study shows that among patients on hemodialysis, HBPM serves as a reliable alternative to 44-hour interdialytic ABPM for the diagnosis of nocturnal hypertension and detection of non-dipping BP status.

24-hour ambulatory blood pressure and cryptogenic ischemic stroke in young adults

Background In young patients, up to 40% of ischemic strokes remain cryptogenic despite modern-day diagnostic work-up. There are limited data on blood pressure (BP) behavior in these patients. Thus, we aimed to compare ambulatory blood pressure (ABP) profiles between young patients with a recent cryptogenic ischemic stroke (CIS) and stroke-free controls. Patients and Methods In this substudy of the international multicenter case–control study SECRETO (NCT01934725), 24-hour ambulatory blood pressure monitoring (ABPM) was performed in consecutive 18–49-year-old CIS patients and stroke-free controls. The inclusion criteria were met by 132 patients (median age, 41.9 years; 56.1% males) and 106 controls (41.9 years; 56.6% males). We assessed not only 24-hour, daytime, and nighttime ABP but also hypertension phenotypes and nocturnal dipping status. Results 24-hour and daytime ABP were higher among controls. After adjusting for relevant confounders, a non-dipping pattern of diastolic blood pressure (DBP) was associated with CIS in the entire sample (odds ratio, 3.85; 95% confidence interval, 1.20–12.42), in participants without antihypertensives (4.86; 1.07–22.02), and in participants without a patent foramen ovale (PFO) (7.37; 1.47–36.81). After excluding patients in the first tertile of the delay between the stroke and ABPM, a non-dipping pattern of DBP was not associated with CIS, but a non-dipping pattern of both systolic BP and DBP was (4.85; 1.37–17.10). In participants with a PFO and in those without hypertension by any definition, no associations between non-dipping patterns of BP and CIS emerged. Conclusions Non-dipping patterns of BP were associated with CIS in the absence of a PFO but not in the absence of hypertension. This may reflect differing pathophysiology underlying CIS in patients with versus without a PFO. Due to limitations of the study, results regarding absolute ABP levels should be interpreted with caution. Key Messages Nocturnal non-dipping patterns of blood pressure were associated with cryptogenic ischemic stroke except in participants with a patent foramen ovale and in those without hypertension by any definition, which may indicate differing pathophysiology underlying cryptogenic ischemic stroke in patients with and without a patent foramen ovale. It might be reasonable to include ambulatory blood pressure monitoring in the diagnostic work-up for young patients with ischemic stroke to detect not only the absolute ambulatory blood pressure levels but also their blood pressure behavior.

Nondipping blood pressure pattern predicts cardiovascular events and mortality in patients with atherosclerotic peripheral vascular disease.

Patients with peripheral vascular disease (PVD) are often underdiagnosed and undertreated. Nocturnal nondipping blood pressure (BP) pattern, as diagnosed by ambulatory BP monitoring (ABPM), is associated with increased cardiovascular risk, but has not been studied in patients with PVD. We aimed to investigate if a nondipping BP pattern predicts cardiovascular events or all-cause death in outpatients with PVD. Consecutive outpatients with carotid or lower-extremity PVD were examined with 24-hour ABPM (n = 396). Nondipping was defined as a < 10% fall in systolic BP level during night-time. We used Cox regression models adjusting for potential confounders. We also evaluated the incremental prognostic value of dipping status in the COPART risk score. Our primary composite outcome was cardiovascular events or all-cause death. In the cohort (mean age 70; 40% women), 137 events occurred during a 5.1-year median follow-up; incident rate of 7.35 events per 100 person-years. Nondipping was significantly associated with outcome (hazard ratio 1.55, 95% CI 1.07-2.26, p = 0.021) in a fully adjusted model. When adding nondipping to the risk markers in the COPART risk score, the model fit significantly improved (χ2 7.91, p < 0.005) and the C-statistic increased from 0.65 to 0.67. In a cohort of outpatients with PVD, nondipping was an independent risk factor for future cardiovascular events or mortality and seemed to be a strong predictor in patients with carotid artery disease but not in lower-extremity PVD. Additional studies are needed to evaluate the clinical utility of ABPM for improved prevention in these high-risk patients. (ClinicalTrials.gov Identifier: NCT01452165).

Circadian blood pressure variability and asymmetric dimethylarginine in patients with glaucoma: cross-sectional study of The LIGHT cohort.

Glaucoma is reportedly associated with asymmetric dimethylarginine (ADMA) and circadian blood pressure (BP) variability, including night-time SBP. We determined whether ADMA level is associated with night-time SBP in patients with glaucoma. In this cross-sectional study, we measured the serum ADMA level and ambulatory BP of 163 patients with glaucoma and 705 participants without glaucoma. Based on the tertiles of serum ADMA level, the patients were divided into three groups: low, intermediate, and high-ADMA. Night-time SBP was determined based on ambulatory BP measured every 30 min for 48 h. The nondipper BP pattern was defined as having a night-time mean SBP decline of less than 10% relative to the mean daytime SBP. In the glaucoma group, the night-time SBP in the high-ADMA group was significantly higher than in the low-ADMA group (123.0 and 114.4 mmHg, respectively; P = 0.003). Multivariable analysis adjusted for the potential confounders showed the night-time SBP, and the odds ratio for nondipper in the high-ADMA group were also significantly higher than in the low-ADMA group ( P = 0.030 and P = 0.021, respectively). Significant associations between continuous serum ADMA levels with night-time SBP and nondipper were also found ( P = 0.002 and 0.006, respectively). In the control group, however, no significant associations were found between serum ADMA levels and night-time SBP and nondipper. A significant interaction effect of the serum ADMA levels and glaucoma on nondipper was found ( P = 0.004). Serum ADMA level was significantly associated with the disturbance of circadian BP variability in patients with glaucoma.

Relationships between Easily Available Biomarkers and Non-Dipper Blood Pressure Pattern in Patients with Stable Coronary Artery Disease.

Chronic inflammation plays an essential role in the pathophysiology of both arterial hypertension (HTN) and coronary artery disease (CAD), and is more pronounced in individuals with a non-dipper circadian blood pressure (BP) pattern. A non-dipping BP pattern is in turn is associated with increased cardiovascular morbi-mortality, and a higher risk of atherosclerotic events. Neutrophil to lymphocyte ratio (NLR), monocyte to lymphocyte ratio (MLR) and platelet to lymphocyte ratio (PLR) are readily available predictors of systemic inflammation and cardiovascular risk. The purpose of our study is to evaluate whether NLR, MLR and PLR can be used as cost-effective predictors of a non-dipping blood pressure pattern in hypertensive patients with stable CAD. We performed a cross-sectional retrospective analysis that included 80 patients with hypertension and stable CAD (mean age 55.51 ± 11.83 years, 71.3% male) referred to a cardiovascular rehabilitation center. All patients underwent clinical examination, 24 h ambulatory blood pressure monitoring (ABPM) and standard blood analysis. Baseline demographic characteristics were similar in both groups. Patients with non-dipper pattern had significantly higher NLR (median = 2, IR (2-3), p < 0.001), MLR (median = 0.31, IR (0.23-0.39), p < 0.001) and PLR (median = 175, IR (144-215), p < 0.001) compared to dippers. Our results suggest that MLR and PLR are inexpensive and easily accessible biomarkers that predict a non-dipping pattern in hypertensive patients with stable CAD.

Non-dipping blood pressure pattern is associated with higher risk of new-onset diabetes in hypertensive patients with obstructive sleep apnea: UROSAH data.

Impairment of circadian blood pressure (BP) patterns has been associated with cardiovascular risks and events in individuals with hypertension and in general populations, which are more likely to be found in obstructive sleep apnea (OSA). The aim of this study was to investigate the association of non-dipping BP pattern with new-onset diabetes in hypertensive patients with OSA, based on Urumqi Research on Sleep Apnea and Hypertension (UROSAH) data. This retrospective cohort study included 1841 hypertensive patients at least 18 years of age, who were diagnosed with OSA without baseline diabetes and had adequate ambulatory blood pressure monitoring (ABPM) data at enrollment. The exposure of interest for the present study was the circadian BP patterns, including non-dipping and dipping BP pattern, and the study outcome was defined as the time from baseline to new-onset diabetes. The associations between circadian BP patterns and new-onset diabetes were assessed using Cox proportional hazard models. Among 1841 participants (mean age: 48.8 ± 10.5 years, 69.1% male), during the total follow-up of 12172 person-years with a median follow-up of 6.9 (inter quartile range: 6.0-8.0) years, 217 participants developed new-onset diabetes with an incidence rate of 17.8 per 1000 person-years. The proportion of non-dippers and dippers at enrollment in this cohort was 58.8% and 41.2%, respectively. Non-dippers were associated with higher risk of new-onset diabetes compared with dippers (full adjusted hazard ratio [HR]=1.53, 95% confidence interval [CI]: 1.14-2.06, P=0.005). Multiple subgroup and sensitivity analyses yielded similar results. We further explored the association of systolic and diastolic BP patterns with new-onset diabetes separately, and found that diastolic BP non-dippers were associated with higher risk of new-onset diabetes (full adjusted HR=1.54, 95% CI: 1.12-2.10, P=0.008), whereas for systolic BP non-dippers, the association was nonsignificant after adjusted the confounding covariates (full adjusted HR=1.35, 95% CI: 0.98-1.86, P=0.070). Non-dipping BP pattern is associated with an approximately 1.5-fold higher risk of new-onset diabetes in hypertensive patients with OSA, suggesting that non-dipping BP pattern may be an important clinical implication for the early prevention of diabetes in hypertensive patients with OSA.

Factors Associating with Non-Dipping Pattern of Nocturnal Blood Pressure in Patients with Essential Hypertension.

Background: In patients with essential hypertension, a non-dipping blood pressure pattern is a strong risk factor for cardiovascular diseases. However, background factors associating with such a blood pressure pattern remain unknown. Methods: Untreated essential hypertensive patients without chronic kidney diseases who were admitted to our outpatient clinic were included. Blood sampling and 24 h ambulatory blood pressure monitoring were mandatorily performed. Non-dipper status was defined as a maximum decrease in nocturnal systolic blood pressure within 10%. Clinical factors associating with non-dipper status were investigated. Results: A total of 154 patients (56 ± 12 years old, 86 men) were included. Among baseline characteristics, a higher serum uric acid level was independently associated with non-dipper status (odds ratio 1.03, 95% confidence interval 1.00−1.05, p < 0.05). Among those with non-dipper status, a higher high-sensitivity C-reactive protein level tended to be associated with incremental nighttime systolic blood pressure levels (p = 0.065). Conclusions: Hyperuricemia and micro-inflammation might be associated with attenuated nocturnal blood pressure dipping and incremental nighttime systolic blood pressure levels.

Pathophysiology of the Nondipping Blood Pressure Pattern.

The nondipping blood pressure (BP) pattern corresponds to a disruption in the circadian BP rhythm with an insufficient decrease in BP levels during nighttime sleep as observed using 24-hour ambulatory BP monitoring. Patients with nondipping BP pattern have poorer renal and cardiovascular outcomes, independent of their average 24-hour BP levels. The pathophysiology of nondipping BP is complex and involves numerous mechanisms: perturbations of (1) the circadian rhythm, (2) the autonomic nervous system, and (3) water and sodium regulation. This review provides an outline of the pathways potentially involved in the nondipping BP profile in different conditions. A recent hypothesis is also discussed involving the role of gut microbiota in the dipping/nondipping patterns, via the fecal diet-derived short chain fatty acids.

Control of Arterial Hypertension by the AhR Blocker CH-223191: A Chronopharmacological Study in Chronic Intermittent Hypoxia Conditions.

Chronic intermittent hypoxia (CIH) is a major contributor to the development of hypertension (HTN) in obstructive sleep apnea (OSA). OSA subjects frequently display a non-dipping pattern of blood pressure (BP) and resistant HTN. After discovering that AHR-CYP1A1 axis is a druggable target in CIH-HTN, we hypothesized that CH-223191 could control BP in both active and inactive periods of the animals, recovering the BP dipping profile in CIH conditions.We evaluated the chronopharmacology of the antihypertensive efficacy of the AhR blocker CH-223191 in CIH conditions (21% to 5% of O2, 5.6cycles/h, 10.5h/day, in inactive period of Wistar rats). BP was measured by radiotelemetry, at 8am (active phase) and at 6pm (inactive phase) of the animals. The circadian variation of AhR activation in the kidney in normoxia was also assessed, measuring the CYP1A1 (hallmark of AhR activation) protein levels.Despite drug administration before starting the inactive period of the animals, CH-223191 was not able to decrease BP during the inactive phase, in CIH conditions, therefore not reverting the non-dipping profile. These results suggest that a higher dose or different time of administration of CH-223191 might be needed for an antihypertensive effect throughout the 24-h cycle.