Head Up Tilting
Mostrando 1-8 de 8 artigos, teses e dissertações.
-
1. Avaliação da função autonômica em portadores de cardiomiopatia hipertrófica com e sem síncope / Assessment of autonomic nervous function in patients with hypertrophic cardiomyopathy with and without syncope
BACKGROUND: Unexplained syncope is considered a risk factor for sudden death in hypertrophic cardiomyopathy (HCM). Several mechanisms are involved in its pathogenesis, including the difficulty in adaptation of the systemic vascular resistance to exertion and to orthostatic stress, which may be influenced by a dysfunction of the autonomic nervous system. The
Publicado em: 2010
-
2. Respostas da frequencia cardiaca e da pressão arterial sistemica as manobras postural passiva e de valsalva, em individuos sedentarios e atletas corredores de longa distancia / Heart rate and blood pressure responses to head-up tilting and valsalva maneuver in long distance runners and sedentary subjects
This research aimed to study the heart rate (HR) and blood pressure (BP) responses to head-up tilting (HUT) and Valsalva maneuver (VM), analyzing the autonomic nervous system control of these variables, in long distance runners and sedentary subjects. The study inc1udeda group of sedentary subjects (S) who did not practice any regular physical activity for a
Publicado em: 1997
-
3. The effect of vagotomy on sodium reabsorption and renin release in anaesthetized dogs subjected to 60 degrees head-up tilt.
1. Anaesthetized dogs were subjected to two 15 min periods of 60 degrees head-up tilt. Renal perfusion pressure was regulated to minimize changes during tilting. 2. In both intact and vagotomized animals there was a fall in systemic arterial pressure and a rise in heart rate. In both intact and vagotomized animals glomerular filtration rate fell slightly dur
-
4. Acute controlled hypotension and EEG in patients with hypertension and cerebrovascular disease
Forty-seven patients with hypertension and/or cerebrovascular disease were examined by an acute controlled hypotension test. This was performed by intravenous administration of the ganglionic blocking agent pentholonium and head-up tilting on a pivoted table with observation of the clinical neurological state and simultaneous EEG recording. Blood pressure wa
-
5. Malignant vasovagal syncope: a randomised trial of metoprolol and clonidine.
OBJECTIVE: To evaluate the efficacy of head up tilt guided treatment with metoprolol and clonidine in preventing the recurrence of syncope in patients with malignant vasovagal syncope. PATIENTS: 20 patients (9 men and 11 women, mean age 33 (SD 17), range 14 to 62 years) with severe symptoms. DESIGN: Randomised double blind crossover trial; efficacy was asses
-
6. Lack of variation in venous tone potentiates vasovagal syncope.
OBJECTIVE--To investigate the peripheral venous response to head up tilting in malignant vasovagal syndrome. PATIENTS--31 Patients with unexplained syncope or dizziness referred from the cardiology department. METHODS--Changes in calf venous volume were studied by a radionuclide technique during 45 degrees head up tilt testing. RESULTS--During tilt testing s
-
7. Idiopathic postural hypotension: physiologic observations and report of a new mode of therapy
Two patients with severe postural hypotension associated with upper motor neuron and cerebellar impairment (Shy-Drager syndrome) have been studied. Head-up tilt and lower body negative pressure application caused marked falls in arterial pressure; in one patient, paradoxical vasodilatation was observed. Ice application did not increase arterial pressure or c
-
8. Effect of patient characteristics on the yield of prolonged baseline head-up tilt testing and the additional yield of drug provocation.
OBJECTIVE: To define the value of tilt testing and hte additional yield of drug provocation over prolonged baseline tilt in different patient subgroups. (Many different protocols are in use for head-up tilt testing in heterogeneous groups of patients. Not all patients in reported series have recurrent syncope, and there is often a wide age range and a variab