1994
DOI: 10.1016/0039-6257(94)90066-3
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The effect of posture on intraocular pressure and pulsatile ocular blood flow in normal and glaucomatous eyes

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Cited by 65 publications
(37 citation statements)
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“…2 The Valsalva manoeuvre is a standard stimulus for the investigation of cerebral and ocular blood flow in humans. 3 There are four phases to the Valsalva manoeuvre. 4 Phase 1, the initiation of Valsalva, creates a rise in arterial pressure as blood is squeezed from the thoracic aorta.…”
Section: Discussionmentioning
confidence: 99%
“…2 The Valsalva manoeuvre is a standard stimulus for the investigation of cerebral and ocular blood flow in humans. 3 There are four phases to the Valsalva manoeuvre. 4 Phase 1, the initiation of Valsalva, creates a rise in arterial pressure as blood is squeezed from the thoracic aorta.…”
Section: Discussionmentioning
confidence: 99%
“…[17][18][19] Friberg and Weinreb 20 found that IOP dramatically increased to levels Ͼ30 mm Hg and retinal arterioles markedly constricted with a head-down vertical position. An autoregulatory mechanism causing increased vascular resistance was believed to maintain constant ocular flow.…”
Section: Discussionmentioning
confidence: 99%
“…Changes in IOP with a head-down position were believed to be due to either increased episcleral venous pressure, increased aqueous production with increased ciliary body blood flow, choroidal vascular engorgement, or a baroreceptor-type reflex phenomenon. 17,20 Two studies have noted correlations between systemic blood pressure and IOP in primary autonomic dysfunction patients, 5,6 but none have done this for a full range of patients with MSA, PAF, and BF for whom medications have been discontinued. It seemed important to study a variety of dysautonomias without pharmaceutical masking to infer whether the effect being studied was specific to a particular lesion or could be extrapolated.…”
Section: Discussionmentioning
confidence: 99%
“…Esses fatores podem ser explicados pelo horário de maior probabilidade dos picos, que ocorreram justamente às 6 horas com o paciente deitado, quando a Minicurva ainda não havia sido iniciada. A distribuição dos picos nas 24 horas concordou com trabalhos existentes que apresentaram 2/3 dos picos antes do almoço (12) . A Po média tanto da CTD como da Minicurva foi maior para o grupo de GPAA do que para o grupo Suspeito, um fato naturalmente esperado.…”
Section: Discussionunclassified
“…A explicação para este fato seria alterações hidrostáticas, como a elevação da pressão venosa episcleral, que ocorrem de uma posição para a outra (12) . Os resultados observados neste estudo sugerem, portanto, que, dos métodos utilizados, o melhor para se detectar pico pressórico seria a medida das 6 horas com o paciente deitado, seguido da CTD e Minicurva.…”
Section: Discussionunclassified