Acute Hypertension Research Articles

Taurine mechanism in preventing retinal cell damage from acute ocular hypertension through GTPBP3 regulation.

We aimed to explore the protective effects and underlying mechanisms of taurine on retinal cells during acute ocular hypertension (AOH)-induced damage. Retinal morphology, apoptosis, mitochondrial structure, electroretinography, expression of GTP binding protein 3 (GTPBP3), and molecules in the unfolded protein response (UPR) were examined in an AOH mouse model and wild-type (WT) mice with or without intravitreal injection of taurine. For in vitro experiments, the GTPBP3 expression and endoplasmic reticulum (ER) stress were examined in R28 cell line under hydrogen peroxide (H2O2)-induced damage or hypoxia/reoxygenation (H/R)-induced damage, with or without taurine pretreatment. Taurine pretreatment alleviated retinal damage caused by AOH modeling. The GTPBP3 expression level decreased after AOH injury, and taurine pretreatment reversed this reduction. Retinas with decreased GTPBP3 expression showed reduced retinal ganglion cell (RGC) function, which could be reversed by intravitreal taurine injection. In H2O2-, H/R-, and AOH-induced damage, UPR were activated and alleviated by taurine pretreatment. GTPBP3 knockdown in R28 cells also activated the UPR, which was alleviated by taurine. A UPR activator downregulated GTPBP3 levels in normal R28 cells, whereas a UPR inhibitor upregulated GTPBP3 levels in GTPBP3 knockdown R28 cells. In conclusion, this study provides important evidence that taurine prevents retinal cell damage in mice exposed to AOH and modulates GTPBP3 expression via the UPR pathway. Interventions targeting this mechanism can be used as potential therapeutic targets for AOH damage.

MOGAD presenting as fulminant intracranial hypertension

ObjectivesMyelin oligodendrocyte glycoprotein antibody disease (MOGAD) has an expanding phenotype. We describe two cases of MOGAD with associated severe intracranial hypertension.Case 1: A 21-year-old male presented with diffuse cortical encephalitis and intracranial hypertension with both serum and CSF MOG antibody positivity. Initial brain CT scan was normal but subsequent demyelination was evident on MRI. Case 2: A 44-year-old female presented with a progressive brainstem encephalitis and intracranial hypertension and normal MRI, with later development of subcortical demyelination which was confirmed on brain biopsy. CSF-restricted MOG antibody was detected following the biopsy results. ResultsBoth patients presented with clinical features of severe intracranial hypertension requiring surgical management followed by immunosuppressive therapy (methylprednisone and plasma exchange; and intravenous immunoglobulin and plasma exchange) leading to clinical improvement. DiscussionMOGAD should be in the differential diagnosis of acute severe intracranial hypertension even in the absence of demyelination on initial neuroimaging. Clinicians should be alert of this syndrome that requires combined management of intracranial pressure in addition to early and intensive immunotherapy.

Risk of ischemic stroke in patients with pulmonary embolism and patent foramen ovale: a systematic review and meta-analysis.

Patients with acute pulmonary hypertension during an acute pulmonary embolism (PE) can develop stroke due to paradoxical embolism in the presence of a patent foramen ovale (PFO). We evaluated the current evidence regarding the risk of ischemic stroke and mortality in patients with PE and a PFO. We performed a systematic review and meta-analysis of studies found on PubMed, the Cochrane Library, Embase, SCOPUS, and the BVS portal. We included full-length reports, prospective observational cohorts, and clinical trials of adult patients (aged ≥18 years) diagnosed with PE and investigating the presence of PFO and new ischemic brain injuries. This study is registered with PROSPERO (CRD42023467133). The initial search identified 1398 articles. After applying exclusion criteria, only 8 articles remained, including a total of 1197 individuals with PE, among whom PFO was identified in 318 patients. Ischemic stroke occurred in 62/318 (19.5%) individuals in the PFO group and in 40/879 (4.5%) individuals in the non-PFO group. The prevalence of ischemic stroke in the PFO group was higher than in the non-PFO group in all eight studies. The meta-analysis showed that PFO was significantly associated with ischemic stroke in patients with PE compared to those without PFO (odds ratio 5.36, 95% CI 3.20-8.99, p < 0.00001; I² = 0%). Three studies also reported higher mortality in the PFO group. Patent foramen ovale is a common condition in patients with acute PE and is associated with a higher incidence of ischemic stroke and increased mortality.

Oxygenation Effects of Antihypertensive Agents in Intensive Care: A Prospective Comparative Study of Nicardipine and Urapidil.

Acute arterial hypertension within the critical care context may necessitate the administration of intravenous antihypertensive agents. Nicardipine and urapidil are notable for their application in intensive care units. Nonetheless, dihydropyridine calcium channel inhibitors (DCCIs) such as nicardipine are implicated in the impairment of hypoxic pulmonary vasoconstriction, potentially disrupting oxygenation. This study aimed to assess the differences in patient oxygenation when these antihypertensive agents are administered intravenously. This bicentric, prospective, observational investigation spanning five intensive care units evaluated patients requiring intravenous nicardipine or urapidil. Oxygenation data were recorded from the start of therapy until the 12th hour. Comparative analysis was performed between patient groups based on the antihypertensive agent administered, along with subgroup investigations to identify populations with an elevated risk of hypoxemia. From November 2021 to November 2023, 197 patients were included: 98 (50%) were treated with nicardipine, and 99 (50%) were treated with urapidil. Hypoxemia occurred in 97 (49%) patients and was more prevalent in the nicardipine cohort, affecting 65 (66%) patients, as opposed to 32 (32%) patients in the urapidil cohort (RR 2.05, 95% CI [1.48-2.82], P < 0.001). Subgroup analysis revealed a significant association between patients with pulmonary atelectasis (RR 2.30, 95% CI [1.4-3.7], P < 0.001) and obesity (RR 2.7, 95% CI [1.5-4.6], P < 0.001). Considering these findings, cautious consideration of the patient's respiratory status should be exercised when initiating intravenous DCCI treatment. However, given the limitations of this study, a controlled trial on hypertension management in the ICU is needed.

Postoperative Blood Pressure Goals After Craniotomy for Tumor Resection: A National Survey.

Acute hypertension can occur in 90% of postcraniotomy patients for tumor resection, and 60% to 90% of patients require treatment with antihypertensive agents. Postoperative intracranial hemorrhage is a major driver of morbidity and mortality after craniotomy for tumor resection, and perioperative hypertension is believed to be a risk factor. Many neurosurgeons impose postoperative blood pressure (BP) goals to mitigate this risk, but there is little evidence to guide the selection of a specific target BP, leading to a wide variation in patient care. In this article, we have conducted a national survey to report the current practices regarding postoperative BP management. We conducted a cross-sectional survey of academic neurosurgical programs by distributing a 10-item questionnaire to neurosurgical residents of each accredited national neurosurgical residency training program (n = 117). Responses were collected over 3 months, from July 2023 to September 2023. Analysis was performed at the program level; for programs with multiple responding residents, the responses of the senior residents were retained. Responses were received from 66 residents at 45 institutions. Forty-two programs set postoperative BP goals using systolic blood pressure (SBP) as a parameter, and 2 used mean arterial pressure. Among programs using an SBP goal, most programs kept a goal SBP of <140 mm Hg (41%-43% depending on the tumor type), followed by SBP <160 mm Hg (36%-39%). Most programs maintained this goal until the morning of the first postoperative day. Intravenous nicardipine (n = 12, 27%) and labetalol (n = 12, 27%) were the most frequently administered medications to maintain BP goals. Most of the academic neurosurgical programs use a postoperative SBP goal after craniotomy for tumor resection. Programs are evenly divided between goals of SBP <140 mm Hg and SBP <160 mm Hg. The variability among programs indicates clinical equipoise between these 2 approaches in the context of a future clinical trial.

Abstract 4135239: Pausing Under Pressure: Ocular Hypertension as an Atypical Cause of Heart Block

A 67-year-old male with a history of hypertension presented to the emergency department with abnormal cardiac monitor results. Prior to this, he was diagnosed with primary open-angle glaucoma by ophthalmology and underwent left-sided aqueous tube shunt placement, which was complicated by hypotony requiring revision and holding of all topical glaucoma medications. Concurrently, he was noted to have an irregular heart rhythm during a routine physical. In office ECG showed normal sinus rhythm, but subsequent 14-day continuous ECG monitor showed sinus bradycardia with nadir heart rate of 21 beats-per-minute and 114 ventricular pauses (longest 4.8 seconds) primarily due to second-degree atrioventricular (AV) block, Mobitz type 1, but also periods of high-grade AV block. He was sent to the emergency department for expedited pacemaker evaluation. On further review, heart block and ventricular pauses occurred exclusively over a 12-hour period that temporally coincided with a hospitalization for acute ocular hypertension following shunt revision. His intraocular pressure peaked at 56 mmHg (normal range 10-21 mmHg), then normalized to 21 mmHg after acetazolamide and anterior chamber paracentesis. Bradycardia resolved following ophthalmic intervention. Bradyarrhythmias were attributed to excess vagal tone from acute ocular hypertension via an atypical but recognized cause of the oculocardiac reflex, and pacemaker placement was avoided. The oculocardiac reflex is a reflex bradycardia involving the trigeminal and vagus nerves. Cardiac effects are consistent with other vagally-mediated bradyarrhythmias, including sinus bradycardia, AV block, and even asystole. This reflex occurs commonly during traction on extraocular muscles during strabismus surgery, but can be seen in other orbital and ocular stimuli. To our knowledge, this is the first documented case of ocular hypertension leading to atrioventricular block through this mechanism. This case illustrates the importance of (1) clinical context of abnormal events during extended cardiac monitoring, (2) understanding the oculocardiac reflex as a cause of bradyarrhythmias, and (3) ruling out reversible medical causes of dysrhythmias prior to permanent device implantation.

Abstract 4135712: Mortality and Cardiovascular Complications Associated with Weight Loss Drugs among Breast Cancer Females Under Cardiotoxic Therapies: A Real-World Populational Study in the United States

Background: Obesity is an adverse prognostic factor for breast cancer (BC). While liraglutide and semaglutide, derived from antidiabetic glucagon-like peptide-1 receptor agonists (GLP1RA), are established weight loss drugs known for their cardiovascular safety in the general obese population, their safety in BC patients undergoing cardiotoxic antineoplastic therapies remains less understood. Objective: To investigate the mortality and cardiovascular outcomes related to GLP1RA used for weight loss among the highly susceptible BC females. Methods: This retrospective cohort study was based on the TrinetX network, comprising real-time health records from over 60 US healthcare organizations. The study population included obese females (≥18 years old) who received at least three prescriptions of either exclusive GLP1RA (liraglutide or semaglutide) or non-GLP1RA weight loss drugs (phentermine, bupropion-naltrexone, orlistat) upon BC diagnosis between 01/01/2015 and 01/01/2022. The index date was the initiation of systemic anti-cancer treatment, including chemotherapy (anthracycline, taxane, or cyclophosphamide), and/or anti-HER2 agents (trastuzumab, pertuzumab, or lapatinib). We used 1:1 propensity score-matching (PSM) to balance demographics, BMI, comorbidities, concurrent medications for cardiovascular diseases and metabolic disorders, BC receptor status and prior treatment, and levels of serum cholesterol (LDL, HDL) and hemoglobin A1c. Cox regression models were applied to compute hazard ratios (HR) and 95% confidence intervals (CIs). Follow-up continued until 05/24/2024, or until adverse cardiovascular events or death occurred. Results: Among 380 PSM-balanced pairs, the GLP1RA group (mean age: 57.6±11) showed significantly lower risks of all-cause mortality (HR 0.593, 95% CI 0.457-0.77), acute heart failure (HR 0.496, 95% CI 0.286-0.859), angina pectoris (HR 0.566, 95% CI 0.343-0.936), and acute stroke (HR 0.661, 95% CI 0.46-0.951) than the non-GLP1RA group (mean age: 57.5±12). Otherwise, no significant difference was shown in acute myocardial infarction (HR 0.787, 95% CI 0.495-1.251), pulmonary hypertension (HR 0.777, 95% CI 0.55-1.099), or arrhythmias (HR 0.829, 95% CI 0.566-1.215). Conclusion: Compared to non-GLP1RA weight loss agents, GLP1RA offers better survival and cardiovascular protection for BC patients undergoing cardiotoxic therapies. Future studies are warranted to validate the safety of these weight loss drugs during the BC treatment continuum.

Response of the nephron arterial network and its interactions to acute hypertension: a simulation.

We simulated the dynamics of a group of 10 nephrons supplied from an arterial network and subjected to acute increases in blood pressure. Arterial lengths and topology were based on measurements of a vascular cast. The model builds on a previous version exercised at a single blood pressure with 2 additional features: pressure diuresis and the effect of blood pressure on efferent arteriolar vascular resistance. The new version simulates autoregulation, and reproduces tubule pressure oscillations. Individual nephron dynamics depended on mean arterial pressure and the axial pressure gradient required to cause blood flow through the arteries. Rhythmic blood withdrawal into afferent arterioles caused blood flow fluctuations in downstream vessels. Blood pressure dependent changes in nephron dynamics affected synchronization metrics. The combination of vascular pressure gradients and oscillations created a range of arterial pressures at the origins of the 10 afferent arterioles. Because arterial blood pressure in conscious animals has 1/f dynamics, we applied an arterial pressure pattern with such dynamics to the model. Amplitude of tubule pressure oscillations were affected by the 1/f blood pressure fluctuations, but the oscillation frequencies did not change. The pressure gradients required to deliver blood to all afferent arterioles impose a complexity that affects nephrons according to their locations in the network, but other interactions compensate to ensure the stability of the system. The sensitivity of nephron response to location on the network, and the constancy of the tubular oscillation frequency provide a spatial and time context.

Posterior reversible encephalopathy syndrome

This review summarises the current knowledge of posterior reversible encephalopathy syndrome which is an acute and severe neurological condition characterised by headache, encephalopathy, epileptic seizures, and visual disturbances. Typical radiological findings are cerebral vasogenic oedema, predominantly localised in the posterior cerebral circulation. The exact pathophysiological mechanisms remain unknown but involve dysfunction of the blood-brain barrier. There are several well-documented causes for the syndrome, the most important being acute hypertension. Management is aimed at identifying and eliminating the underlying cause and preventing secondary brain injury from, e.g., epileptic seizures.

An earthquake reality: fasciotomy wounds and treatments

Earthquake-induced Crush Syndrome and subsequent acute kidney injury are important issues that affect morbidity and mortality. Fasciotomies prolong the length of stay in intensive care unit in patients with Compartment Syndrome due to the complications it causes. Infections and delayed wound healing are two common complications among these. Therefore, early closure of fasciotomy wounds is recommended. Although different treatments can be applied for treatment of wounds, data on this subject in pediatric patients are insufficient. We report the case of a 15-year-old girl who developed acute renal failure due to crush syndrome after being trapped in the wreckage for 9 hours and undergoing fasciotomy procedures for four locations, in the left extremity, two in the thigh and two in the cruris. Hemodialysis, antihypertensive, and antibiotic treatment were administered during the intensive care follow-up due to acute kidney injury, hypertension, and sepsis. With negative pressure therapy, silver alginate wound dressing, and hyperbaric oxygen therapy, all wounds epithelialized within two months. However, rehabilitation for drop foot syndrome caused by nerve cuts in the left extremity continues.

Oral health behavior associated with cardiometabolic outcomes: A nationally representative cross-sectional study in Portugal

BackgroundOral diseases are associated with the development of cardiometabolic diseases. This study aimed to evaluate the relationship between oral health behaviors (tooth brushing and oral health appointments) with cardiometabolic diseases. MethodsData from the First National Health Examination Survey were used. Participants aged 25–74 years and diagnosis of acute myocardial infarction (n = 4442), stroke (n = 4441), hypertension (n = 4450) and diabetes (n = 4327) were analyzed. A fifth subsample (n = 2555) included participants aged 40–69 for calculating cardiovascular risk. Poor oral health behavior was defined as brushing once a day or less and having the last oral health appointment at 12 months or more. Poisson regression models assessed the relationship between poor oral health behavior and these cardiometabolic outcomes. ResultsAmong 4.450 participants, 20.5 % had poor oral health behavior. A statistically significant association was found between poor oral health behavior with diabetes (PR: 1.44 [95 % CI: 1.10–1.98], and high/very high cardiovascular risk (PR: 1.42 [95 % CI: 1.25–1.62]). In the sensitivity analysis the association with diabetes and high/very high cardiovascular risk persisted when considering only brushing behavior but not when considering only oral health appointments at 12 months or more. ConclusionsIndividuals with poor oral health behavior had a higher prevalence of diabetes and high/very high cardiovascular risk. Sensitivity analysis suggested that regular tooth brushing may be the main behavior for preventing diabetes and cardiovascular risk. The results suggest that regular tooth brushing may act in prevention for diabetes and cardiovascular risk.

A novel three-dimensional method for detailed analysis of RGC central projections under acute ocular hypertension

Normal perception of visual information relies not only on the quantity and quality of retinal ganglion cells (RGCs), but also on the integrity of the visual pathway, within which RGC central projection predominates. However, the exact changes of RGC central projection under particular pathological conditions remain to be elucidated. Here, we report a whole-brain clearing method modified from iDISCO for 3D visualization of RGC central projection. The CTB-labeled RGC central projection was visualized three-dimensionally with minimized both fluorescence quenching and the time taken. For observation of RGC axonal degeneration pattern under pathological conditions, we took acute ocular hypertension (AOH) as an example. Mice were intracamerally irrigated, and fluorescent signal in brain subregions where RGC axons projected to were quantified. The novel methodology is well-applied for rapid clearing and observation of RGC central projection in C57BL/6J, showing damaged RGC central projection on the AOH side and the most statistically significant degeneration in the superior colliculi (SC). Detailed analysis also revealed a distinct injury pattern among lateral geniculate nuclei (LGN) subregions, with the parvocellular part of the pregeniculate nuclei (PrGPC) being more vulnerable compared with the magnocellular part (PrGMC). The intracranial retrograde labeling of RGC subgroups based on brain damage variation showed PrGPC-projecting RGCs (Plgn RGC) being smaller than PrGMC-projecting RGCs (Mlgn RGC) in size and less in number, yet more vulnerable in terms of degeneration under AOH. Our data revealed the methodology for visualizing selective neuronal vulnerability under AOH, and in the meantime provided novel approach for future mechanisms exploration regarding RGC degeneration.

LncRNA MEG3 aggravates acute pulmonary embolism-induced pulmonary arterial hypertension by regulating miR-34a-3p/DUSP1 axis.

Acute pulmonary embolism (APE)-induced pulmonary artery hypertension (PAH) is a fatal disease. The miR-34-3p/DUSP1 has inhibitory effects on the thickening of the pulmonary arterial walls in APE rats and the proliferation of platelet-derived growth factor-BB (PDGF-BB)-induced human pulmonary arterial smooth muscle cells (hPASMCs). Herein, the lncRNAs regulating the miR-34a-3p/DUSP1 axis in APE and PAH are further explored in vitro and in vivo. MEG3 targeted miR-34a-3p. MEG3 overexpression potentiated the effects of PDGF-BB treatment on promoting the viability and proliferation of hPASMCs, as well as the mPAP level in APE rats. Also, overexpressed MEG3 strengthened PDGF-BB-induced upregulation of MEG3, NOR-1, PCNA and DUSP1, as well as downregulation of miR-34a-3p in hPASMCs and APE rats. However, shMEG3 generated opposite effects. MiR-34a-3p mimic reversed the effect of MEG3 overexpression, and DUSP1 overexpression neutralized the effect of MEG3 downregulation on PDGF-BB-induced hPASMCs and APE rats.MEG3 aggravates APE-induced PAH by regulating miR-34a-3p/DUSP1 axis, holding a great promise as a novel biomarker for PAH treatment.

Influence of Comorbidities on Health-Related Quality of Life in Alcohol-Related Liver Disease: A Population-Based Survey

Extrahepatic comorbidities are common in alcohol-related liver disease (ALD). We examined associations between burden of comorbidities, alcohol, and smoking with low health-related quality of life (HRQoL) among patients with ALD. Patients with ALD and matched comparators were identified among respondents of the Danish National Health Survey waves in 2010-2017. Survey data included generic measures of physical and mental HRQoL (12-Item Short Form Health Survey), comorbidities, alcohol and smoking. Low HRQoL in ALD was defined as ≥1.5 SD worse than the average HRQoL in the comparators. Odds ratios (ORs) of low HRQoL were estimated with multivariable logistic regression, adjusting for potential confounders. We included 772 ALD patients, 53% of whom had cirrhosis; 37% had low physical HRQoL and 22% had low mental HRQoL. Disc herniation (found in 21%), osteoarthritis (36%), chronic obstructive pulmonary disease (11%), cancer (6%), stroke (1%), and psychiatric disease (9%) were associated with low physical and/or mental HRQoL, whereas alcohol use disorder (24%), diabetes (19%), acute myocardial infarction (1%), hypertension (34%), and osteoporosis (12%) were not. For example, osteoarthritis was associated with low physical (OR, 2.17; 95% confidence interval, 1.54-3.05) and low mental (OR, 1.91; 95% confidence interval, 1.27-2.88) HRQoL. For lifestyle factors, drinking ≥20 units/week was associated with low physical and smoking ≥20 cigarettes/day with low mental HRQoL when compared with abstainers and nonsmokers, respectively. Common comorbidities including chronic obstructive pulmonary disease, musculoskeletal disease, and psychiatric disease are associated with low HRQoL in ALD, independent of liver disease severity, and so are alcohol consumption and smoking. These findings highlight the importance of multidisciplinary management of patients with ALD.

Association between estimated glomerular filtration rate and prognosis in patients with cardiovascular disease with and without sarcopenia

Abstract Background/Introduction A low estimated glomerular filtration rate (eGFR) has been identified as a poor prognostic factor in patients with cardiovascular diseases (CVD). Since serum creatinine, which defines eGFR, is a metabolite of skeletal muscle, low skeletal muscle mass can result in reduced creatinine production and potentially overestimate renal function. This raises concerns about the reliability of eGFR as a prognostic indicator in patients with both CVD and sarcopenia. The impact of this relationship, however, remains uncertain. Purpose This study aimed to explore the association between eGFR and prognosis in patients with CVD, both with and without sarcopenia. Methods We included 2,444 CVD patients (mean age 69.0 ± 13.7 years) who had assessments of eGFR and sarcopenia at discharge. Sarcopenia was diagnosed according to the 2019 Asian Sarcopenia Working Group Diagnostic Criteria. Patients were categorized into sarcopenia and non-sarcopenia groups, each further divided into high eGFR (eGFR ≥60 mL/min/1.73 m²) and low eGFR (eGFR &amp;lt;60 mL/min/1.73 m²) subgroups. Kaplan-Meier curves, log-rank tests, and multivariate Cox regression analyses were employed to compare prognoses between these groups, adjusting for age, sex, BMI, left ventricular ejection fraction (LVEF), history of myocardial infarction (MI), acute coronary syndrome (ACS), heart failure (HF), hypertension (HT), dyslipidaemia (DL), diabetes mellitus (DM), and smoking history. The primary endpoint was a composite of all-cause mortality and rehospitalization. Results Median follow-up was 1.11 (interquartile range [IQR], 0.43–2.32) years for the non-sarcopenia group and 0.94 (IQR, 0.30–2.15) years for the sarcopenia group. Event rates were 24.2% in the non-sarcopenia group and 30.8% in the sarcopenia group. Both Kaplan-Meier and log-rank tests indicated that a low eGFR, regardless of sarcopenia status, was associated with a higher incidence of composite events (p &amp;lt; 0.001). Multivariate Cox regression analysis revealed a significant association between low eGFR and increased risk of composite events in both the non-sarcopenia [hazard ratio (HR): 1.55, 95% confidence interval (CI): 1.44–1.67; p &amp;lt; 0.001] and sarcopenia groups [HR: 1.36, 95% CI: 1.25–1.48; p &amp;lt; 0.001]. Conclusion Low eGFR is associated with poor prognosis in patients with CVD, irrespective of sarcopenia status.

Atypical posterior reversible encephalopathy syndrome following craniotomy for a metastatic lesion: illustrative case.

An 80-year-old male was found to have a metastatic lesion in his cerebrum. He underwent uncomplicated resection with prolonged inhalational anesthesia due to issues with intravenous access prior to surgery. Postoperatively, the patient had persistent altered mental status. Immediate postoperative head computed tomography and continuous electroencephalography were negative for possible causes. Standard brain magnetic resonance imaging (MRI) after metastatic resection demonstrated the development of edema in his pons and thalami, concerning for posterior reversible encephalopathy syndrome (PRES). Tight blood pressure control was initiated. His neurological examination returned to baseline. Follow-up MRI showed the resolution of edema. This is a report of PRES hypothesized to be attributable to prolonged inhalational anesthetic. PRES is a disorder in which patients present with altered mentation, seizures, visual impairment, or headache. PRES often occurs due to acute uncontrolled hypertension; however, other conditions, including autoimmune disease and cancer chemotherapy, have been linked. In severe cases, permanent brain damage and death have been reported. The authors present a case of PRES as the cause of severe neurological decline following craniotomy without severe or sustained hypertension. The authors hypothesize that PRES could be caused by blood pressure variability in the perioperative period and prolonged anesthesia. https://thejns.org/doi/10.3171/CASE24245.

Evaluation of a Physiologic-Driven Closed-Loop Resuscitation Algorithm in an Animal Model of Hemorrhagic Shock.

Appropriate resuscitation from hemorrhagic shock is critical to restore tissue perfusion and to avoid over-resuscitation. The objective of this study was to test the ability of a closed-loop diagnosis and resuscitation algorithm called resuscitation from shock using functional hemodynamic monitoring using invasive monitoring (ReFit1) and minimally invasive monitoring (ReFit2) to identify, treat, and stabilize a porcine model of severe hemorrhagic shock. We created a ReFit algorithm using dynamic hemodynamic parameters of pulse pressure variation (PPV), stroke volume variation (SVV), dynamic arterial elastance (Eadyn = PPV/SVV), driven by mean arterial pressure (MAP), mixed venous oxygen saturation, and heart rate targets to define the need for fluids, vasopressors, and inotropes. University-based animal laboratory. Twenty-seven female pigs. Anesthetized, intubated, and ventilated (8 mL/kg) pigs were bled at 10 mL/min until a MAP of less than 40 mm Hg, held for 30 minutes, then resuscitated. The ReFit algorithm used the above dynamic parameters to drive computer-controlled infusion pumps to deliver blood, lactated Ringer's solution, norepinephrine, and in ReFit1 dobutamine. In four animals, after initial resuscitation from hemorrhagic shock, the ability of the ReFit1 algorithm to treat acute air embolism-induced pulmonary hypertension and right heart failure was also tested. In 10 ReFit1 and 17 ReFit2 animals, the time to stabilization from shock was not dissimilar to open controlled resuscitation performed by an expert physician (52 ± 12, 50 ± 13, and 60 ± 15 min, respectively) with similar amounts of fluids and norepinephrine needed. In four ReFit1 animals after initial stabilization, the algorithm successfully resuscitated the animals after inducing an acute air embolism right heart failure, with all animals recovering stability within 30 minutes. Our physiologically based functional hemodynamic monitoring-centered closed-loop resuscitation system can effectively diagnose and treat cardiovascular shock due to hemorrhage and air embolism.

Undetected Takayasu arteritis presenting as severe hypertension in children: a report of two cases

Takayasu arteritis (TA) is a rare chronic granulomatous vasculitis mainly affecting the aorta and its main branches. Clinical presentations of TA are non-specific, especially in the initial phase, which likely contributes to delayed diagnosis besides the rarity of the disorder. Childhood-onset of TA is associated with significant morbidity and mortality. This case report aimed to present two rare cases of acute symptomatic severe hypertension in children due to TA.

Role of aldosterone in various target organ damage in patients with hypertensive emergency: a cross-sectional study

BackgroundHypertensive emergency is a critical disease that causes multiple organ injuries. Although the renin-angiotensin-aldosterone system (RAS) is enormously activated in this disorder, whether the RAS contributes to the development of the organ damage has not been fully elucidated. This cross-sectional study was conducted to characterize the association between RAS and the organ damage in patients with hypertensive emergencies.MethodsWe enrolled 63 patients who visited our medical center with acute severe hypertension and multiple organ damage between 2012 and 2020. Hypertensive target organ damage was evaluated on admission, including severe kidney impairment (eGFR less than 30 mL/min/1.73 m2, SKI), severe retinopathy, concentric left ventricular hypertrophy (c-LVH), thrombotic microangiopathy (TMA), heart failure with reduced ejection fraction (HFrEF) and cerebrovascular disease. Then, whether each organ injury was associated with blood pressure or a plasma aldosterone concentration was analyzed.ResultsAmong 63 patients, 31, 37, 43 and 8 cases manifested SKI, severe retinopathy, c-LVH and ischemic stroke, respectively. All populations with the organ injuries except cerebral infarction had higher plasma aldosterone concentrations than the remaining subset but exhibited a variable difference in systolic or diastolic blood pressure. Twenty-two patients had a triad of SKI, severe retinopathy and c-LVH, among whom 5 patients manifested TMA. Furthermore, the number of the damaged organs was correlated with plasma aldosterone levels (Spearman’s coefficient = 0.50), with a strong association observed between plasma aldosterone (≥ 250 pg/mL) and 3 or more complications (odds ratio = 9.16 [95%CI: 2.76–30.35]).ConclusionIn patients with hypertensive emergencies, a higher aldosterone level not only contributed to the development of the organ damage but also was associated with the number of damaged organs in each patient.

L-Arginine and Taurisolo® Effects on Brain Hypoperfusion-Reperfusion Damage in Hypertensive Rats.

Acute and chronic hypertension causes cerebral vasculopathy, increasing the risk of ischemia and stroke. Our study aimed to compare the effects of arterial pressure reduction on the pial microvascular responses induced by hypoperfusion and reperfusion in spontaneously hypertensive Wistar rats, desamethasone-induced hypertensive Wistar rats and age-matched normotensive Wistar rats fed for 3 months with a normal diet or normal diet supplemented with L-arginine or Taurisolo® or L-arginine plus Taurisolo®. At the end of treatments, the rats were submitted to bilateral occlusion of common carotid arteries for 30 min and reperfusion. The microvascular parameters investigated in vivo through a cranial window were: arteriolar diameter changes, permeability increase, leukocyte adhesion to venular walls and percentage of capillaries perfused. Hypoperfusion-reperfusion caused in all rats marked microvascular changes. L-arginine treatment was effective in reducing arterial blood pressure causing vasodilation but did not significantly reduce the damage induced by hypoperfusion-reperfusion. Taurisolo® treatment was less effective in reducing blood pressure but prevented microvascular damage from hypoperfusion-reperfusion. L-arginine plus Taurisolo® maintained blood pressure levels within the physiological range and protected the pial microcirculation from hypoperfusion-reperfusion-induced microvascular injuries. Therefore, the blood pressure reduction is not the only fundamental aspect to protect the cerebral circulation from hypoperfusion-reperfusion damage.