Background Recent radiological studies have shown that arteriovenous malformations with impaired venous drainage may be susceptible to hemorrhage. To evaluate this hypothesis using a hemodynamic approach, we measured intravascular pressure during surgery in three patients with arteriovenous malformation. Summary of Report In three patients we measured intravascular pressures in the draining ven...

Cerebral venous blood gas tensions were correlated with elevated intracranial pressure in spontaneously breathing dogs lightly anesthetized with nitrous oxide/halothane. Intracranial pressure was elevated by infusion of artificial cerebrospinal fluid into a lateral ventricle. Respiration and blood pressure were monitored. The results of these experiments indicate that cerebral venous carbon dio...

Venous occlusion strain gauge plethysmography (VOP) is based on the assumption that the veins are occluded and arterial inflow is undisturbed by the venous cuff pressure. Literature is not clear concerning the pressure that should be used. The purpose of this study was to determine the optimal venous occlusion pressure at which the highest arterial inflow is achieved in the forearm, calf, and l...

Model studies have been advanced to suggest both that a siphon does and does not support cerebral blood flow in an upright position. If a siphon is established with the head raised, it would mean that internal jugular pressure reflects right atrium pressure minus the hydrostatic difference from the brain. This study measured spinal fluid pressure in the upright position, the pressure and the ul...

Calf venous compliance improves with aerobic training and declines with age. Individuals with hypertension often have decreased arterial and venous compliance. Acute high consumption of NaCl may increase net transcapillary fluid filtration in the limbs, but it is unknown if this acutely high NaCl intake will alter non-invasive assessment of calf venous compliance. In humans, assessment of limb ...

Simultaneous measurements of the jugular and right atrial venous pressures were made in 16 patients undergoing cardiac and vascular surgery to see whether the jugular veins were a reliable guide to central venous pressure. It was found that with the chest closed both the external and internal jugular veins on the right side provided a good guide. The vessels on the left side were less consisten...

LETTERS Spontaneous venous pulsations should be monitored during glaucoma therapy It is well established that lowering intraocular pressure slows or halts progression of glau-coma. None the less, changes in intracranial pressure also affect the pressure gradient across the lamina cribrosa. Normal intraocu-lar pressures combined with low intracranial pressures produce the same pressure different...

A 70-year-old man had the superior vena cava syndrome. At thoracotomy a retained central venous pressure line was found to be the cause of venous thrombosis at the outlet of the superior vena cava into the right atrium. A retained central venous pressure catheter and catheter-induced venous thrombosis should be added to the list of causes of the benign form of the superior vena cava syndrome.