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Fulltext Hypertension update: lessons from the literature

Ong HT

Med J Malaysia, 2002 Dec;57(4):510-4.
PMID: 12733181
Matched MeSH terms: Hypertension/physiopathology
Comment on "Noninvasive Assessment of Intracranial Pressure: Deformability Index as an Adjunct to Optic Nerve Sheath Diameter to Increase Diagnostic Ability"

Suresh V, Magoon R

Neurocrit Care, 2024 Aug;41(1):303-304.
PMID: 38951445 DOI: 10.1007/s12028-024-02025-y
Matched MeSH terms: Intracranial Hypertension/physiopathology
Interrelationship between the kallikrein-kinin system and hypertension: a review

Sharma JN

Gen. Pharmacol., 1988;19(2):177-87.
PMID: 3280399

The evidence presented here suggests strongly that the kallikreins-kininogens-kinins-kininase II system has most significant role in regulation of systemic BP. This system is involved in mediation and modulation of renin-angiotensin-aldosterone, PGS and vasopressin in the regulation of sodium water balance, renal hemodynamic and BP. Therefore, reduction in the kinin-formation due to high production of kininase II, and lower formation of tissue kallikrein might result in an increased release of vasoconstrictor angiotensin II on one side, and on the other side much reduced production of PGE, vasodilator. These changes might lead to deranged vascular smooth muscle structures and cell membrane functions, retention of sodium and water, increased plasma volume, and renovascular constriction. These physiological defects might result in the development of essential hypertension (Fig. 4). Although, it is possible now to treat hypertensive conditions with tissue kallikrein and kininase II inhibitors. These discoveries have opened up new vistas to research on the pharmacological applications of kallikreins-kininogens-kinins-kininases in human diseases.

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Animal Models in Cardiovascular Research: Hypertension and Atherosclerosis

Leong XF, Ng CY, Jaarin K

Biomed Res Int, 2015;2015:528757.
PMID: 26064920 DOI: 10.1155/2015/528757

Hypertension and atherosclerosis are among the most common causes of mortality in both developed and developing countries. Experimental animal models of hypertension and atherosclerosis have become a valuable tool for providing information on etiology, pathophysiology, and complications of the disease and on the efficacy and mechanism of action of various drugs and compounds used in treatment. An animal model has been developed to study hypertension and atherosclerosis for several reasons. Compared to human models, an animal model is easily manageable, as compounding effects of dietary and environmental factors can be controlled. Blood vessels and cardiac tissue samples can be taken for detailed experimental and biomolecular examination. Choice of animal model is often determined by the research aim, as well as financial and technical factors. A thorough understanding of the animal models used and complete analysis must be validated so that the data can be extrapolated to humans. In conclusion, animal models for hypertension and atherosclerosis are invaluable in improving our understanding of cardiovascular disease and developing new pharmacological therapies.

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Impact of a Workplace Health Promotion Program on Employees' Blood Pressure in a Public University

Eng JY, Moy FM, Bulgiba A

PLoS One, 2016;11(2):e0148307.
PMID: 26840508 DOI: 10.1371/journal.pone.0148307

INTRODUCTION: Workplace health promotion is important in the prevention of non-communicable diseases among employees. Previous workplace health programs have shown benefits such as lowered disease prevalence, reduced medical costs and improved productivity. This study aims to evaluate the impact of a 6-year workplace health promotion program on employees' blood pressure in a public university.
METHODS: In this prospective cohort study, we included 1,365 employees enrolled in the university's workplace health promotion program, a program conducted since 2008 and using data from the 2008-2013 follow-up period. Participants were permanent employees aged 35 years and above, with at least one follow up measurements and no change in antihypertensive medication during the study period. Baseline socio-demographic information was collected using a questionnaire while anthropometry measurements and resting blood pressure were collected during annual health screening. Changes in blood pressure over time were analyzed using a linear mixed model.
RESULTS: The systolic blood pressure in the hypertension subgroup decreased 2.36 mmHg per year (p<0.0001). There was also significant improvement in systolic blood pressure among the participants who were at risk of hypertension (-0.75 mmHg, p<0.001). The diastolic blood pressure among the hypertensive and at risk subgroups improved 1.76 mmHg/year (p<0.001) and 0.56 mmHg/year (p<0.001), respectively. However, there was no change in both systolic and diastolic blood pressure among participants in the healthy subgroup over the 6-year period.
CONCLUSION: This study shows that continuing participation in workplace health promotion program has the potential to improve blood pressure levels among employees.

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Renal Denervation in Asia: Consensus Statement of the Asia Renal Denervation Consortium

Kario K, Kim BK, Aoki J, Wong AY, Lee YH, Wongpraparut N, et al.

Hypertension, 2020 Mar;75(3):590-602.
PMID: 32008432 DOI: 10.1161/HYPERTENSIONAHA.119.13671

The Asia Renal Denervation Consortium consensus conference of Asian physicians actively performing renal denervation (RDN) was recently convened to share up-to-date information and regional perspectives, with the goal of consensus on RDN in Asia. First- and second-generation trials of RDN have demonstrated the efficacy and safety of this treatment modality for lowering blood pressure in patients with resistant hypertension. Considering the ethnic differences of the hypertension profile and demographics of cardiovascular disease demonstrated in the SYMPLICITY HTN (Renal Denervation in Patients With Uncontrolled Hypertension)-Japan study and Global SYMPLICITY registry data from Korea and Taiwan, RDN might be an effective hypertension management strategy in Asia. Patient preference for device-based therapy should be considered as part of a shared patient-physician decision process. A practical population for RDN treatment could consist of Asian patients with uncontrolled essential hypertension, including resistant hypertension. Opportunities to refine the procedure, expand the therapy to other sympathetically mediated diseases, and explore the specific effects on nocturnal and morning hypertension offer a promising future for RDN. Based on available evidence, RDN should not be considered a therapy of last resort but as an initial therapy option that may be applied alone or as a complementary therapy to antihypertensive medication.

Matched MeSH terms: Hypertension/physiopathology
Fulltext Home blood pressure control status in 2017-2018 for hypertension specialist centers in Asia: Results of the Asia BP@Home study

Kario K, Tomitani N, Buranakitjaroen P, Chia YC, Park S, Chen CH, et al.

J Clin Hypertens (Greenwich), 2018 12;20(12):1686-1695.
PMID: 30444315 DOI: 10.1111/jch.13415

A self-measured home blood pressure (BP)-guided strategy is an effective practical approach to hypertension management. The Asia BP@Home study is the first designed to investigate current home BP control status in different Asian countries/regions using standardized home BP measurements taken with the same validated home BP monitoring device with data memory. We enrolled 1443 medicated hypertensive patients from 15 Asian specialist centers in 11 countries/regions between April 2017 and March 2018. BP was relatively well controlled in 68.2% of patients using a morning home systolic BP (SBP) cutoff of <135 mm Hg, and in 55.1% of patients using a clinic SBP cutoff of <140 mm Hg. When cutoff values were changed to the 2017 AHA/ACC threshold (SBP <130 mm Hg), 53.6% of patients were well controlled for morning home SBP. Using clinic 140 mm Hg and morning home 135 mm Hg SBP thresholds, the proportion of patients with well-controlled hypertension (46%) was higher than for uncontrolled sustained (22%), white-coat (23%), and masked uncontrolled (9%) hypertension, with significant country/regional differences. Home BP variability in Asian countries was high, and varied by country/region. In conclusion, the Asia BP@Home study demonstrated that home BP is relatively well controlled at hypertension specialist centers in Asia. However, almost half of patients remain uncontrolled for morning BP according to new guidelines, with significant country/regional differences. Strict home BP control should be beneficial in Asian populations. The findings of this study are important to facilitate development of health policies focused on reducing cardiovascular complications in Asia.

Matched MeSH terms: Hypertension/physiopathology*; White Coat Hypertension/physiopathology; Masked Hypertension/physiopathology
Fulltext The blood pressure variability, arterial elasticity and humoral factors in subjects with family history of hypertension

Rafidah HM, Azizi A, Suhaimi H, Noriah MN

Med J Malaysia, 2008 Mar;63(1):9-16.
PMID: 18935724 MyJurnal

Normotensive subjects with family history of hypertension (FHT) have been reported to have increased left ventricular mass index and reduced ventricular compliance. Of interest is whether blood pressure variability (BPV), which has been associated with target organ damage, is then part of this complex inherited syndrome? The objectives of this study are to determine whether there are any significant differences in BPV, arterial compliance and humoral factors in subjects with FHT as compared to controls. Thirty-five subjects with self reported FHT and 35 matched controls underwent 24 hour BP monitoring (BR-102, Schiller Inc. Germany). Arterial compliance was measured using systolic pulse wave tonometry (HDI/Pulsewave Cardiovascular Profiling Instrument, Hypertension Diagnostic Inc. USA). None of the subjects were hypertensive or diabetic. Out of these numbers, 25 subjects with FHT and 26 controls had measurements of plasma catecholamines, plasma renin and serum aldosterone. Catecholamines were assayed with high performance liquid chromatography, while both renin and aldosterone measurements were by radioimmunoassay. Subjects with FHT have higher night time BPV. There was no significant difference in arterial compliances between both groups. There were increased level of norepinephrine (NE) in subjects with FHT but epinephrine (E), renin and aldosterone levels were similar in both groups. There were no correlations between NE and BPV but E was negatively associated with daytime and mean arterial systolic BPV. In conclusion subjects with FHT demonstrated a higher night time BPV and NE level as compared to controls.

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Peri-operative blood pressure changes in normotensive and hypertensive patients

Poh KS, Lim TA, Airini IN

Med J Malaysia, 2007 Jun;62(2):97-103.
PMID: 18705438

Controversy surrounds the acceptance of hypertension as an independent risk factor for anaesthesia. In an attempt to identify variables that are associated with increased haemodynamic instability during surgery, the blood pressure profiles of 128 patients were analysed. The two variables that contributed most to the instability were pre-operative control of blood pressure and anaesthetic technique. To reduce the fluctuation in blood pressure, it is advisable for patients to be given a regional anaesthetic. Current therapy for hypertension appears to exaggerate the depressant effects of anaesthetic drugs. Care must be taken not only to prevent hypertensive episodes during surgery, but also hypotension.

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Blood pressure variability and arterial elasticity in hypertensive subjects

Rafidah HM, Azizi A, Noriah MN

Med J Malaysia, 2006 Jun;61(2):189-98.
PMID: 16898310 MyJurnal

Apart from the mean 24 hour ambulatory blood pressure (ABP), the blood pressure variability (BPV) also bears an independent relationship with target-organ damage in hypertension. A reduction in arterial compliance has been demonstrated in hypertension but its relation to BPV is still unknown. The aim of the study is to compare BPV and arterial compliance between hypertensive and normotensive subjects. Eighteen hypertensives and 18 controls were enrolled. Noninvasive 24-hour ABP monitoring was performed with BR-102 monitor (Schiller Inc. Germany). Arterial compliance was determined by the HDI/Pulsewave Research Cardiovascular Profiling Instrument (Hypertension Diagnostic Inc. USA). There were significantly higher systolic, diastolic and mean arterial BPV in hypertensives as compared to normotensive group. Only systolic BPV remained significantly high in hypertensives during night time. There were lower arterial compliances in hypertensive as compared to normotensive group. No significant relationship however was found between BPV and arterial compliance in hypertensive subjects. In conclusion, there were higher BPV and lower arterial compliances in hypertensive subjects as compared to normotensive subjects.

Matched MeSH terms: Hypertension/physiopathology*
2005 Young Investigator's Award Winner: Assessment of diastolic function in newly diagnosed hypertensives

Masliza M, Daud SM, Khalid Y

Ann Acad Med Singap, 2005 Dec;34(11):684-5.
PMID: 16453041

INTRODUCTION: The prevalence and severity of diastolic dysfunction (DD) among newly diagnosed hypertensives (NDHT) is not fully established. The aim of this study was to evaluate left ventricular diastolic function (LVDF) in patients with NDHT.
MATERIALS AND METHODS: This study involved 396 subjects (198 NDHT, age and gender matched 198 normotensives; age, 30 to 50 years). Parameters of LVDF included Doppler-echocardiographic measurements of peak early (E) and late (A) diastolic velocities, E-wave deceleration time (DT) and isovolumetric relaxation time (IVRT). E/A ratio of <1 was taken as an indicative of DD.
RESULTS: Patients with NDHT had reduced E/A ratio (1.27 +/- 0.41 vs 1.37 +/- 0.35, P <0.001) and shortened DT (180.0 +/- 40.0 ms vs 190.0 +/- 30.0 ms, P = 0.025). The peak A velocity and IVRT were increased in the NDHT group [(62.73 +/- 13.82 ms vs 58.26 +/- 12.40 ms, P = 0.002) and (90.0 +/- 20.0 ms vs 80.0 +/- 10.0 ms, P <0.001), respectively]. Peak E velocity was similar in both groups. The prevalence of DD was increased in the NDHT group, 18.6% (32) vs 3.4% (6), P <0.001. Of the 32 NDHT subjects who had DD, 84.4% (27) had no left ventricular hypertrophy (LVH) and 15.7% (5) had LVH. Diastolic function was negatively correlated with age, body mass index, systolic blood pressure, diastolic blood pressure and left ventricular mass index.
CONCLUSION: Impairment in LVDF occurs in NDHT which may precede structural abnormalities. Hypertension, obesity, older age and LVH are associated with worsening of diastolic function.

Matched MeSH terms: Hypertension/physiopathology*
An internet-based blood pressure monitoring system for patients

Aris IB, Wagie AA, Mariun NB, Jammal AB

J Telemed Telecare, 2001;7(1):51-3.
PMID: 11265939

We developed a personal blood pressure monitoring system for patients with hypertension or hypotension. The system can be used to measure a patient's blood pressure at home and to transmit the data automatically to a hospital database via the Internet. The accuracy of blood pressure readings using the system was assessed by comparison with readings from a standard digital sphygmomanometer in four subjects. The measurement error for the systolic readings was 1.7-2.7% and for the diastolic readings 2.7-3.2%. The system therefore appears to be a promising means of assessing blood pressure remotely.

Matched MeSH terms: Hypertension/physiopathology
Could hypertension possibly be adaptive?

Prakash ES, Fink GD

Clin Exp Pharmacol Physiol, 2010 Feb;37(2):e99-e106.
PMID: 19719749 DOI: 10.1111/j.1440-1681.2009.05284.x

1. We believe that the ultimate goal of cardiovascular regulatory mechanisms is not the regulation of arterial blood pressure (BP), but the maintenance of tissue blood flows commensurate with metabolic requirements. Thus, elevated BP can potentially contribute to optimizing tissue blood flows under select circumstances; for example, when there are primary defects in autoregulation of tissue blood flows. 2. The hypothesis that a primary defect in autoregulation of tissue blood flows may be responsible for the development of hypertension is presented. It is argued that, in this context, at least part of the rise in BP may be reflexly driven by a 'metaboreflex', a homeostatic mechanism acting to regulate tissue blood flows. 3. We argue that in the context of primary defects in autoregulation of tissue blood flows, the ability to generate and sustain a hypertensive phenotype increases the lifespan of species (i.e. if it were not for this adaptive hypertensive phenotype, death due to circulatory failure would occur much earlier). 4. Experimental and clinical evidence that indirectly supports the hypothesis is reviewed briefly and a means for testing this hypothesis is suggested.

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Factors associated with the severity of hypertension among Malaysian adults

Mahadir Naidu B, Mohd Yusoff MF, Abdullah S, Musa KI, Yaacob NM, Mohamad MS, et al.

PLoS One, 2019;14(1):e0207472.
PMID: 30605462 DOI: 10.1371/journal.pone.0207472

High blood pressure is a worldwide problem and major global health burden. Whether alone or combined with other metabolic diseases, high blood pressure increases the risk of cardiovascular disease. This study is a secondary data analysis from the National Health and Morbidity Survey 2015, a population-based study that was conducted nationwide in Malaysia using a multi-stage stratified cluster sampling design. A total of 15,738 adults ≥18-years-old were recruited into the study, which reports the prevalence of hypertension stages among adults in Malaysia using the JNC7 criteria and determinants of its severity. The overall prevalence of raised blood pressure was 66.8%, with 45.8% having prehypertension, 15.1% having Stage 1 hypertension, and 5.9% having Stage 2 hypertension. In the multivariate analysis, a higher likelihood of having prehypertension was observed among respondents with advancing age, males (OR = 2.74, 95% CI: 2.41-3.12), Malay ethnicity (OR = 1.21, 95% CI: 1.02-1.44), lower socioeconomic status, and excessive weight. The factors associated with clinical hypertension (Stages 1 and 2) were older age, rural residency (Stage 1 OR = 1.22, Stage 2 OR = 1.28), Malay ethnicity (Stage 2 OR = 1.64), diabetes (Stage 2 OR = 1.47), hypercholesterolemia (Stage 1 OR = 1.34, Stage 2 OR = 1.82), being overweight (Stage 1 OR = 2.86, Stage 2 OR = 3.44), obesity (Stage 1 OR = 9.01, Stage 2 OR = 13.72), and lower socioeconomic status. Almost 70% of Malaysian adults are at a risk of elevated blood pressure. The highest prevalence was in the prehypertension group, which clearly predicts a future incurable burden of the disease. Public health awareness, campaigns through mass and social media, and intervention in the work place should be a priority to control this epidemic.

Matched MeSH terms: Hypertension/physiopathology
Fulltext Effects of Vegetarian Diets on Blood Pressure Lowering: A Systematic Review with Meta-Analysis and Trial Sequential Analysis

Lee KW, Loh HC, Ching SM, Devaraj NK, Hoo FK

Nutrients, 2020 May 29;12(6).
PMID: 32486102 DOI: 10.3390/nu12061604

The beneficial effects of a vegetarian diet on blood pressure (BP) control have been reported in previous systematic reviews; however, so far, their relative effectiveness is not well established. Here, we performed a systematic review together with trial sequential analysis to determine the effect of a vegetarian diet on the reduction of blood pressure. We searched the randomized controlled trial (RCT) through Medline, PubMed and Cochrane Central Register. Fifteen eligible RCTs with 856 subjects were entered into the analysis. The pooled results demonstrated that vegetarian diet consumption significantly lowered the systolic blood pressure (weighted mean difference (WMD), -2.66 mmHg (95% confidence interval (CI) = -3.76, -1.55, p < 0.001) and diastolic BP was WMD, -1.69 95% CI = -2.97, -0.41, p < 0.001) as compared to an omnivorous diet. In subgroup analysis, a vegan diet demonstrated a greater reduction in systolic BP (WMD, -3.12 mm Hg; 95% CI = -4.54, -1.70, p < 0.001) as compared with a lacto-ovo-vegetarian diet (WMD, -1.75 mm Hg, 95% CI -5.38, 1.88, p = 0.05). The vegan diet has showed a similar trend in terms of diastolic blood pressure reduction (WMD, -1.92 mm Hg (95% CI = -3.18, -0.66, p < 0.001) but those with a lacto-ovo-vegetarian diet showed no changes in diastolic BP reduction (WMD, 0.00, 95% CI = 0.00, 0.00), p =0.432). In conclusion, vegetarian diets are associated with significant reductions in BP compared with omnivorous diets, suggesting that they may play a key role in the primary prevention and overall management of hypertension.

Matched MeSH terms: Hypertension/physiopathology
Fulltext COVID-19 as a viral functional ACE2 deficiency disorder with ACE2 related multi-organ disease

Gan R, Rosoman NP, Henshaw DJE, Noble EP, Georgius P, Sommerfeld N

Med Hypotheses, 2020 Nov;144:110024.
PMID: 32758871 DOI: 10.1016/j.mehy.2020.110024

SARS-CoV-2, the agent of COVID-19, shares a lineage with SARS-CoV-1, and a common fatal pulmonary profile but with striking differences in presentation, clinical course, and response to treatment. In contrast to SARS-CoV-1 (SARS), COVID-19 has presented as an often bi-phasic, multi-organ pathology, with a proclivity for severe disease in the elderly and those with hypertension, diabetes and cardiovascular disease. Whilst death is usually related to respiratory collapse, autopsy reveals multi-organ pathology. Chronic pulmonary disease is underrepresented in the group with severe COVID-19. A commonality of aberrant renin angiotensin system (RAS) is suggested in the at-risk group. The identification of angiotensin-converting-enzyme 2 (ACE2) as the receptor allowing viral entry to cells precipitated our interest in the role of ACE2 in COVID-19 pathogenesis. We propose that COVID-19 is a viral multisystem disease, with dominant vascular pathology, mediated by global reduction in ACE2 function, pronounced in disease conditions with RAS bias toward angiotensin-converting-enzyme (ACE) over ACE2. It is further complicated by organ specific pathology related to loss of ACE2 expressing cells particularly affecting the endothelium, alveolus, glomerulus and cardiac microvasculature. The possible upregulation in ACE2 receptor expression may predispose individuals with aberrant RAS status to higher viral load on infection and relatively more cell loss. Relative ACE2 deficiency leads to enhanced and protracted tissue, and vessel exposure to angiotensin II, characterised by vasoconstriction, enhanced thrombosis, cell proliferation and recruitment, increased tissue permeability, and cytokine production (including IL-6) resulting in inflammation. Additionally, there is a profound loss of the "protective" angiotensin (1-7), a vasodilator with anti-inflammatory, anti-thrombotic, antiproliferative, antifibrotic, anti-arrhythmic, and antioxidant activity. Our model predicts global vascular insult related to direct endothelial cell damage, vasoconstriction and thrombosis with a disease specific cytokine profile related to angiotensin II rather than "cytokine storm". Our proposed mechanism of lung injury provides an explanation for early hypoxia without reduction in lung compliance and suggests a need for revision of treatment protocols to address vasoconstriction, thromboprophylaxis, and to minimize additional small airways and alveolar trauma via ventilation choice. Our model predicts long term sequelae of scarring/fibrosis in vessels, lungs, renal and cardiac tissue with protracted illness in at-risk individuals. It is hoped that our model stimulates review of current diagnostic and therapeutic intervention protocols, particularly with respect to early anticoagulation, vasodilatation and revision of ventilatory support choices.

Matched MeSH terms: Hypertension/physiopathology
Central and peripheral blood pressure profile of young offspring with hypertensive and normotensive parents

Othman AS, Othman NI, Rosman A, Nudin SS, Rahman AR

J Hypertens, 2012 Aug;30(8):1552-5.
PMID: 22635140 DOI: 10.1097/HJH.0b013e328355207b

OBJECTIVES: In this cross-sectional study we compared the central aortic systolic pressure (CASP), peripheral brachial systolic pressure (PSP), peripheral brachial diastolic pressure (PDP) and augmentation index (AIx) between normotensive offspring of nonhypertensive parents (ONT) and normotensive offspring with at least one hypertensive parent (OHT).
METHODOLOGY: A total of 100 healthy ONT (mean age 20.95 ± 2.06) and 100 healthy OHT (mean age 20.89 ± 2.12) individuals were recruited. Parental history of hypertension was determined by detailed history taking. CASP, PSP, PDP and AIx were measured using the BPro device. All blood pressure (BP) measurements were calibrated using oscillometric BP readings.
RESULTS: The OHT group had higher PSP (117.57 ± 10.06 versus 114.52 ± 8.94, P < 0.05), PDP (72.39 ± 7.28 versus 70.39 ± 6.50, P < 0.05) and CASP (103.72 ± 8.95 versus 101.37 ± 7.74, P < 0.05) compared to the ONT group. There was no significant difference in AIx in the ONT group (57.97 ± 11.02 versus 58.08 ± 12.16, P = 0.95) in comparison to the OHT group. However, following adjustments for certain cardiovascular risk factors, only PSP (117.33 versus 114.76, P < 0.05) remained significantly higher in the OHT group compared to the ONT group. Analysis of adjusted data within sex showed that CASP was higher in the female OHT group compared to the female ONT group, whereas PDP were higher in the male OHT group compared to the male ONT group.
CONCLUSION: Alterations in PSP, PDP and CASP are already present in early life in normotensive offspring of hypertensive parents, with possible differences in mechanism between different sexes.
Study site: Clinical Research Laboratory in Cyberjaya University College of Medical Sciences, Selangor, Malaysia

Matched MeSH terms: Hypertension/physiopathology*
Fulltext Pneumocephalus and air travel: an experimental investigation on the effects of aircraft cabin pressure on intracranial pressure

Lim E, Lan BL, Ooi EH, Low HL

Sci Rep, 2020 08 12;10(1):13626.
PMID: 32788610 DOI: 10.1038/s41598-020-70614-w

This study investigates the effects of aircraft cabin pressure on intracranial pressure (ICP) elevation of a pneumocephalus patient. We propose an experimental setup that simulates the intracranial hydrodynamics of a pneumocephalus patient during flight. It consists of an acrylic box (skull), air-filled balloon [intracranial air (ICA)], water-filled balloon (cerebrospinal fluid and blood) and agarose gel (brain). The cabin was replicated using a custom-made pressure chamber. The setup can measure the rise in ICP during depressurization to levels similar to that inside the cabin at cruising altitude. ΔICP, i.e. the difference between mean cruising ICP and initial ICP, was found to increase with ICA volume and ROC. However, ΔICP was independent of the initial ICP. The largest ΔICP was 5 mmHg; obtained when ICA volume and ROC were 20 ml and 1,600 ft/min, respectively. The postulated ICA expansion and the subsequent increase in ICP in pneumocephalus patients during flight were successfully quantified in a laboratory setting. Based on the quantitative and qualitative analyses of the results, an ICA volume of 20 ml and initial ICP of 15 mmHg were recommended as conservative thresholds that are required for safe air travel among pneumocephalus patients. This study provides laboratory data that may be used by doctors to advise post-neurosurgical patients if they can safely fly.

Matched MeSH terms: Intracranial Hypertension/physiopathology*
Hypertension in the absence of urinary abnormalities - An unusual presentation of anaphylactoid purpura

Thong PL, How KN, Bakrin IH

Med J Malaysia, 2020 07;75(4):436-438.
PMID: 32724011

Henoch-Schonlein Purpura (HSP) or anaphylactoid purpura, currently named IgA vasculitis is the most common form of systemic vasculitis in children. In adults and young infants, HSP tends to have atypical presentations with higher rates of severe gastrointestinal problems and delayed renal complications. While hypertension is a known complication of HSP nephritis, it is rarely seen in individuals with normal renal function and urinary findings. We report a case of a 7-year-old boy with HSP, who presented with abdominal pain and severe hypertension without other features of glomerulonephritis.

Matched MeSH terms: Hypertension/physiopathology*
The Probability of Resistant Hypertension During Dental Treatment of Chronic Kidney Disease Patients

Chidambaram R

J Coll Physicians Surg Pak, 2017 Jan;27(1):44-46.
PMID: 28292368 DOI: 2520

Oral rehabilitation in medically compromised patients like chronic kidney disease (CKD) needs special dental care. Many papers have been published on dental considerations for such individuals. However, literature citing oral care for patients with risk factors of CKD are scarce. Resistant hypertension, one such risk factor, is closely related to CKD. Furthermore, the associated increased prevalence and adverse renal/cardiac outcomes motivated the author to report its unexplored association/impact during dental care. The importance of assessing glomerular filtration rate is highlighted to better understand patients' medical conditions.

Matched MeSH terms: Hypertension/physiopathology

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