keyword
MENU ▼
Read by QxMD icon Read
search

orthostatic hypotension hypovolemia

keyword
https://www.readbyqxmd.com/read/29735525/orthostatic-hypotension-and-risk-of-clinical-and-subclinical-cardiovascular-disease-in-middle-aged-adults
#1
Stephen P Juraschek, Natalie Daya, Lawrence J Appel, Edgar R Miller, John William McEvoy, Kunihiro Matsushita, Christie M Ballantyne, Elizabeth Selvin
BACKGROUND: Although orthostatic hypotension (OH) is a well-recognized manifestation of neuropathy and hypovolemia, its contribution to cardiovascular disease (CVD) risk is controversial. METHODS AND RESULTS: Participants with OH, defined as a decrease in blood pressure (systolic ≥20 mm Hg or diastolic ≥10 mm Hg) from the supine to standing position, were identified during the first visit of the ARIC (Atherosclerosis Risk in Communities) Study (1987-1989) within 2 minutes of standing...
May 7, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29696346/orthostatic-intolerance-and-postural-tachycardia-syndrome-new-insights-into-pathophysiology-and-treatment
#2
REVIEW
Mohammed Ruzieh, Blair P Grubb
Orthostatic intolerance is characterized by symptoms of light-headedness or syncope that is provoked upon standing or in an upright posture. It is most commonly caused by postural orthostatic tachycardia syndrome (POTS) or orthostatic hypotension (OH). Its pathophysiology is complex and commonly involves abnormal autonomic nervous system regulation, autoimmunity, a hyperadrenergic state, and hypovolemia. This article reviews the pathophysiology underlying orthostatic intolerance, as well as the current treatment available...
June 2018: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/29523389/postural-tachycardia-syndrome-diagnosis-physiology-and-prognosis
#3
REVIEW
Amy C Arnold, Jessica Ng, Satish R Raj
Postural tachycardia syndrome (POTS) is a heterogeneous clinical syndrome that has gained increasing interest over the past few decades due to its increasing prevalence and clinical impact on health-related quality of life. POTS is clinically characterized by sustained excessive tachycardia upon standing that occurs in the absence of significant orthostatic hypotension and other medical conditions and or medications, and with chronic symptoms of orthostatic intolerance. POTS represents one of the most common presentations of syncope and presyncope secondary to autonomic dysfunction in emergency rooms and in cardiology, neurology, and primary care clinics...
February 28, 2018: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/29222399/pediatric-disorders-of-orthostatic-intolerance
#4
REVIEW
Julian M Stewart, Jeffrey R Boris, Gisela Chelimsky, Phillip R Fischer, John E Fortunato, Blair P Grubb, Geoffrey L Heyer, Imad T Jarjour, Marvin S Medow, Mohammed T Numan, Paolo T Pianosi, Wolfgang Singer, Sally Tarbell, Thomas C Chelimsky
Orthostatic intolerance (OI), having difficulty tolerating an upright posture because of symptoms or signs that abate when returned to supine, is common in pediatrics. For example, ∼40% of people faint during their lives, half of whom faint during adolescence, and the peak age for first faint is 15 years. Because of this, we describe the most common forms of OI in pediatrics and distinguish between chronic and acute OI. These common forms of OI include initial orthostatic hypotension (which is a frequently seen benign condition in youngsters), true orthostatic hypotension (both neurogenic and nonneurogenic), vasovagal syncope, and postural tachycardia syndrome...
January 2018: Pediatrics
https://www.readbyqxmd.com/read/29045952/-progress-in-diagnosis-and-management-of-syncope-in-children
#5
W R Xu, Y Liao, H F Jin, Q Y Zhang, C S Tang, J B DU
Syncope is a common emergency of children and adolescents, which has serious influence on the quality of life. Neurally-mediated syncope, including postural tachycardia syndrome, vasovagal syncope, orthostatic hypotension and orthostatic hypertension, is the main cause of syncope in children and adolescents. The main manifestations of neurally-mediated syncope are diverse, such as dizziness, headache, chest tightness, chest pain, pale complexion, fatigue, pre-syncope and syncope. Although the clinical manifestations are similar, each subtype of syncope has its hemodynamic feature and optimal treatment option...
October 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28577744/orthostatic-hypotension-a-review
#6
Adrien Joseph, Ruben Wanono, Martin Flamant, Emmanuelle Vidal-Petiot
Orthostatic hypotension, defined by a drop in blood pressure of at least 20mmHg for systolic blood pressure and at least 10mmHg for diastolic blood pressure within 3minutes of standing up, is a frequent finding, particularly in elderly patients. It is associated with a significant increase in morbidity and mortality. Although it is often multifactorial, the first favoring factor is medications. Other etiologies are divided in neurogenic orthostatic hypotension, characterized by autonomic failure due to central or peripheral nervous system disorders, and non-neurogenic orthostatic hypotension, mainly favoured by hypovolemia...
April 2017: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/28385881/quantitative-measurement-of-csf-in-patients-with-spontaneous-intracranial-hypotension
#7
H-C Chen, P-L Chen, Y-H Tsai, C-H Chen, C C-C Chen, J-W Chai
BACKGROUND AND PURPOSE: CSF hypovolemia is a core feature of spontaneous intracranial hypotension. Spontaneous intracranial hypotension is characterized by orthostatic headache and radiologic manifestations, including CSF along the neural sleeves, diffuse pachymeningeal enhancement, and/or venous engorgement. However, these characteristics are only qualitative. Quantifying intraspinal CSF volumes could improve spontaneous intracranial hypotension diagnosis and evaluation of hypovolemic statuses in patients with spontaneous intracranial hypotension...
May 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/26205572/lower-body-negative-pressure-historical-perspective-research-findings-and-clinical-applications
#8
George J Crystal, M Ramez Salem
Lower body negative pressure (LBNP) is a technique that redistributes blood from the upper body to the dependent regions of the pelvis and legs, thus reducing central venous pressure and venous return. The subject is placed in a cylindrical air-tight metal tank, which is sealed at the level of the iliac crests, and subatmospheric pressure is produced using a vacuum pump. This article reviews the historical background, physiological effects, research findings, and clinical applications of LBNP. LBNP is found in both the basic science and clinical literature, encompassing its diverse investigational and clinical applications...
April 2015: Journal of Anesthesia History
https://www.readbyqxmd.com/read/26198889/postural-tachycardia-syndrome-beyond-orthostatic-intolerance
#9
REVIEW
Emily M Garland, Jorge E Celedonio, Satish R Raj
Postural tachycardia syndrome (POTS) is a form of chronic orthostatic intolerance for which the hallmark physiological trait is an excessive increase in heart rate with assumption of upright posture. The orthostatic tachycardia occurs in the absence of orthostatic hypotension and is associated with a >6-month history of symptoms that are relieved by recumbence. The heart rate abnormality and orthostatic symptoms should not be caused by medications that impair autonomic regulation or by debilitating disorders that can cause tachycardia...
September 2015: Current Neurology and Neuroscience Reports
https://www.readbyqxmd.com/read/25684232/orthostatic-hypotension-of-unknown-cause-unanticipated-association-with-elevated-circulating-n-terminal-brain-natriuretic-peptide-nt-probnp
#10
Balaji Krishnan, Margarita Patarroyo-Aponte, Daniel Duprez, Marc Pritzker, Emil Missov, David G Benditt
BACKGROUND: The pathophysiology of orthostatic hypotension (OH) is multifactorial, with the most frequent causes being adverse effects of cardioactive drugs. In 20%-40% of cases, the etiology is unknown. In recent reports, altered levels of endogenous neuropeptides have been observed in noncardiac syncope, but B-type natriuretic peptide (BNP) and its amino-terminal cleavage fragment (NT-proBNP) have not been studied. OBJECTIVE: The purpose of this study was to assess the possibility that BNP with its diuretic and vasorelaxant properties could contribute to OH...
June 2015: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/25569595/diagnosis-and-treatment-of-cerebral-salt-wasting-syndrome-with-cryptococcal-meningitis-in-hiv-patient
#11
Sunggeun Lee, Anitsira Collado, Montish Singla, Roger Carbajal, Ashok Chaudhari, Donald Baumstein
Hyponatremia is one of the most common electrolyte imbalances in HIV patients. The differential diagnosis may include hypovolemic hyponatremia, syndrome of inappropriate antidiuretic hormone secretion (SIADH), and adrenal insufficiency. Here, we describe a case of hyponatremia secondary to cerebral salt wasting syndrome (CSWS) in an HIV patient with cryptococcal meningitis. A 52-year-old man with a history of diabetes and HIV was admitted for headache and found to have cryptococcal meningitis. He was also found to have asymptomatic hyponatremia...
March 2016: American Journal of Therapeutics
https://www.readbyqxmd.com/read/25071585/neurohumoral-mechanisms-associated-with-orthostasis-reaffirmation-of-the-significant-contribution-of-the-heart-rate-response
#12
REVIEW
Victor A Convertino
The inability to compensate for acute central hypovolemia underlies the clinical development of orthostatic hypotension and instability (e.g., syncope). Although neuro-humoral control of both cardiac output and peripheral vascular resistance contributes to hemodynamic stability during orthostasis, a notion has been proposed that the failure of adequate peripheral vascular constriction rather than cardiac responses represents the primary mechanism underlying the development of orthostatic intolerance. This review article provides an opportunity to present compelling evidence captured over the past 30 years in our laboratory to support the concept that neural-mediated tachycardia during orthostasis in healthy individuals represents a critical response to tolerating acute reduction in central blood volume in addition to, and independent of, peripheral vascular constriction...
2014: Frontiers in Physiology
https://www.readbyqxmd.com/read/24778619/arterial-pressure-and-cerebral-blood-flow-variability-friend-or-foe-a-review
#13
REVIEW
Caroline A Rickards, Yu-Chieh Tzeng
Variability in arterial pressure and cerebral blood flow has traditionally been interpreted as a marker of cardiovascular decompensation, and has been associated with negative clinical outcomes across varying time scales, from impending orthostatic syncope to an increased risk of stroke. Emerging evidence, however, suggests that increased hemodynamic variability may, in fact, be protective in the face of acute challenges to perfusion, including significant central hypovolemia and hypotension (including hemorrhage), and during cardiac bypass surgery...
2014: Frontiers in Physiology
https://www.readbyqxmd.com/read/24760494/low-pressure-spinal-fluid-leak-headache
#14
REVIEW
Roderick C Spears
Low cerebrospinal fluid (CSF) pressure results in neurologic deficits, of which the most common manifestation is headache. Typically, the headache is postural - and specifically, orthostatic - in presentation. There are three hypotheses to explain the occurrence of headache associated with low CSF fluid. The first is traction on pain-sensitive intracranial and meningeal structures; the second is CSF hypovolemia; and the third is spinal loss of CSF resulting in increased compliance at the caudal end of the CSF space...
June 2014: Current Pain and Headache Reports
https://www.readbyqxmd.com/read/24711524/reduced-cerebral-blood-flow-with-orthostasis-precedes-hypocapnic-hyperpnea-sympathetic-activation-and-postural-tachycardia-syndrome
#15
Andrew T Del Pozzi, Christopher E Schwartz, Deepali Tewari, Marvin S Medow, Julian M Stewart
Hyperventilation and reduced cerebral blood flow velocity can occur in postural tachycardia syndrome (POTS). We studied orthostatically intolerant patients, with suspected POTS, with a chief complaint of upright dyspnea. On the basis of our observations of an immediate reduction of cerebral blood flow velocity with orthostasis, we hypothesize that the resulting ischemic hypoxia of the carotid body causes chemoreflex activation, hypocapnic hyperpnea, sympathetic activation, and increased heart rate and blood pressure in this subset of POTS...
June 2014: Hypertension
https://www.readbyqxmd.com/read/24470768/misdiagnosed-spontaneous-intracranial-hypotension-complicated-by-subdural-hematoma-following-lumbar-puncture
#16
Nissrine Louhab, Nawal Adali, Mehdi Laghmari, Wafae El Hymer, Said Ait Ben Ali, Najib Kissani
INTRODUCTION: Spontaneous intracranial hypotension is an infrequent cause of secondary headache due to cerebrospinal fluid (CSF) hypovolemia. OBJECTIVE: To describe a case of headache revealing spontaneous intracranial hypotension complicated by subdural hematoma following lumbar puncture. OBSERVATION: A 34-year-old man presented with acute postural headache. The first cerebral computed tomography scan was normal. Lumbar puncture showed hyperproteinorachy at 2 g/L with six lymphocytic cells...
2014: International Journal of General Medicine
https://www.readbyqxmd.com/read/24375330/cerebral-venous-thrombosis-an-unexpected-complication-from-spinal-surgery
#17
REVIEW
Bruno Lourenço Costa, Motasem Shamasna, Joana Nunes, Florbela Magalhães, António Júdice Peliz
PURPOSE: To provide new insights into the pathophysiology, prevention and diagnosis of cerebral venous thrombosis (CVT) associated with iatrogenic cerebrospinal fluid (CSF) leaks and/or external CSF drainage. METHODS: Case report and literature review. RESULTS: We describe the case of a 30-year-old woman who developed a CSF fistula after lumbar spinal surgery. The treatment included rest, hydration, caffeine, and continuous lumbar CSF drainage...
May 2014: European Spine Journal
https://www.readbyqxmd.com/read/24365296/transient-loss-of-consciousness-and-syncope
#18
REVIEW
Claudio L Bassetti
Syncope describes a sudden and brief transient loss of consciousness (TLOC) with postural failure due to cerebral global hypoperfusion. The term TLOC is used when the cause is either unrelated to cerebral hypoperfusion or is unknown. The most common causes of syncopal TLOC include: (1) cardiogenic syncope (cardiac arrhythmias, structural cardiac diseases, others); (2) orthostatic hypotension (due to drugs, hypovolemia, primary or secondary autonomic failure, others); (3) neurally mediated syncope (cardioinhibitory, vasodepressor, and mixed forms)...
2014: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/24339614/two-cases-of-medically-refractory-spontaneous-orthostatic-headaches-with-normal-cerebrospinal-fluid-pressures-responding-to-epidural-blood-patching-intracranial-hypotension-versus-hypovolemia-and-the-need-for-clinical-awareness
#19
Kaukab M Hassan, Sudeep Prakash, S S Majumdar, Anup Banerji
The diagnosis of spontaneous intracranial hypotension or cerebrospinal fluid (CSF) hypovolemia syndrome requires a high index of suspicion and meticulous history taking, demonstration of low CSF pressure and/or neuroimaging features. A 31-year-old male, presented with subacute onset moderate occipital and sub-occipital headaches precipitated by upright posture and relieved on recumbency and neck pain for 2 years. There was no trauma, cranial/spinal surgery. Clinical examination was normal and CSF opening pressure and laboratory study were normal...
October 2013: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/24261222/-the-present-state-and-view-of-the-cerebrospinal-fluid-hypovolemia-research
#20
Masamichi Shinonaga
Spontaneous intracranial hypotension is a rare disease characterized by orthostatic headache, low cerebrospinal fluid pressure and diffuse dural enhancement in brain MRI. German neurologist Schaltenbrand reported that orthostatic headache by low cerebrospinal fluid pressure in 1938. This disease came to be known after development of radiological diagnosis in 1990'. The author reported that cerebrospinal fluid leak is induced in the whiplash sequelae after traffic accident in 2003. Cerebrospinal fluid hypovolemia got into the news social...
October 2013: Nihon Rinsho. Japanese Journal of Clinical Medicine
keyword
keyword
71896
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"