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Poblado C-11 José María Morelos y Pavón, Mexico

Garcia G.D.,Laboratorio Of Neurofisiologia Clinica | Vidal B.E.,Laboratorio Of Neurofisiologia Clinica
Gaceta Medica de Mexico | Year: 2012

S. Basch (1837-1905) succeeded F. Semeleder as personal physician to the Mexican emperor. The newly appointed imperial physician had been a pupil of Brücke (1819-1892) in Vienna. After the death of the emperor, Basch returned to Europe, where he would study under the guidance of K. Ludwig (1816-1895). Thereafter he invented the sphygmomanometer in Berlin. Source

Malamud-Kessler C.,Laboratorio Of Neurofisiologia Clinica | Bruno E.,Laboratorio Of Neurofisiologia Clinica | Senties-Madrid H.,Laboratorio Of Neurofisiologia Clinica | Campos-Sanchez M.,Cayetano Heredia Peruvian University
Neurologia | Year: 2014

Introduction: Neurally-mediated syncope (NMS) is defined as a transient loss of consciousness due to an abrupt and intermittent drop in blood pressure (BP). Objectives: This study describes the putative pathophysiological mechanisms giving rise to NMS, the role of baroreflex (BR), and the interaction of its main haemodynamic variables: heart rate (HR) and BP. Development: Episodic dysregulation affects control over the haemodynamic variables (HR and BP) mediated by baroreflex mechanisms. During active standing, individuals experience a profound transient drop in systolic BP due to the effect of gravity on the column of blood and probably also because of reflex vasodilation. Abnormalities in the BR in NMS could be due to a more profound drop in BP upon standing, or to delayed or incomplete vasoconstriction resulting from inhibited or delayed sympathetic activity. Conclusions: Sympathetic hyperactivity is present in patients with NMS at rest and before syncope. During active standing or passive tilting, excessive tachycardia may be followed by bradycardia and profound hypotension. Recovery of systolic BP is delayed or incomplete. © 2014 Sociedad Española de Neurología. Source

Estanol-Vidal B.,Laboratorio Of Neurofisiologia Clinica | Gutierrez-Manjarrez F.,Laboratorio Of Neurofisiologia Clinica | Senties-Madrid H.,Laboratorio Of Neurofisiologia Clinica | Berenguer-Sanchez M.J.,Laboratorio Of Neurofisiologia Clinica | And 3 more authors.
Revista de Neurologia | Year: 2016

Introduction. The veno-arteriolar reflex (VAR) is triggered by an increase in the transmural venous pressure on placing a part of the body in the same direction as the gravitational acceleration below the heart. Aim. To assess the VAR in healthy subjects on raising a part of the body above the level of the heart. Subjects and methods. VAR was studied in 16 healthy subjects (20-65 years old) by means of changes in the blood flow in the skin detected using a digital infrared photoplethysmograph attached to the fingertip under the following conditions: right arm at the height of the heart, right arm below the heart and right arm below the level of the heart. The variables measured were: amplitude of the blood flow in the skin with the arm raised to the height of the heart (baseline amplitude), percentage decrease of the blood flow in the skin with the arm below the heart and percentage increase in blood flow with the arm above the heart. Results. The percentage of vasoconstriction with the right arm below the heart was 35%, and that of vasodilation, 50%. Conclusions. Evaluation of the VAR with the arm below the heart causes vasoconstriction, and elevation of the arm causes an important degree of vasodilation. Vasoconstriction and vasodilation are maintained while the limb is kept above or below the heart. This is an economical and potentially very useful way of studying the innervation of the microcirculation in a number of different peripheral neuropathies of thin and mixed fibres. © 2016 Revista de Neurología. Source

Malamud-Kessler C.,Laboratorio Of Neurofisiologia Clinica | Estanol-Vidal B.,Laboratorio Of Neurofisiologia Clinica | Ayala-Anaya S.,Laboratorio Of Neurofisiologia Clinica | Senties-Madrid H.,Laboratorio Of Neurofisiologia Clinica | Hernandez-Camacho M.A.,Laboratorio Of Neurofisiologia Clinica
Revista Mexicana de Neurociencia | Year: 2014

Skin mechanoreceptors are essential for the vibro-tactile sensory perception. The vibro-tactile perception depends mainly on both fast adapting receptors (Pacini and Meissner's corpuscles) and slow adapting ones (Merkel discs). Vibratory perception in the periphery has different characteristics depending on the skin surface that receives its afferents. From a mechanical point of view, the vibration sinusoid has different characteristics (amplitude and firing frequency), which confer diverse properties and will generate distinguishable features in the vibro-tactile perception. The vibratory stimuli transmission pathway from the periphery to the somatosensory cortex includes four neural relays that retain a somatotopic distribution along the way, and the signal decoding in each relay, preserves its mechanical characteristics. At a cortical level it appears that the secondary somatosensory area (SII) receives afferents mainly from high-frequency mechanoreceptors capable of discriminating primarily the frequency but also the amplitude (pitch) of the vibratory stimulus. Finally it is recognized that a co-activation of both somatosensory and auditory association cortices occurs, and that this co-activation is dependent on the intrinsic properties of the vibration sinusoid (frequency, amplitude and duration) as well as on the environmental feedback. Source

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