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Biomedical subjects

A Harders

Publications and source records attributed to A Harders.

64 records · Page 4Linked to original sources
PubMed1985

Transcranial Doppler sonography and its application in extracranial-intracranial bypass surgery.

Transcranial Doppler sonography is a new non-invasive technique to measure atraumatically intracranial haemodynamics. The Doppler principles and the investigative procedure with respect to the cranio-cerebral topography in normal subjects are described. Normal blood flow velocities in the circle of Willis and the influence of age and CO2-pressure are discussed in Part I. With the Doppler method, a description of the pre- and postoperative intracranial haemodynamics in patients undergoing extracranial-intracranial bypass surgery is possible for the first time. Superficial temporal artery compression tests demonstrate the contribution of the bypass to the brain circulation. Bypass surgery can be controlled without angiography. The surgeon can gain a better understanding of the haemodynamics of circulation in the brain.

Blood Flow Velocity↗
PubMed1984

[Transcranial Doppler sonography in neurosurgery].

Using a 2 MHz transcranial Doppler sonographic system, it has become possible to measure flow velocities in the large basal vessels of the circle of Willis through thin areas of the cranial bone. After having used the method for one year on patients with neurovascular diseases, we now know that it can be employed as a matter of routine, after one has become familiar with it, and that it is of great diagnostic value. Knowing the measuring depth, achived by range gating, and with the aid of compression tests and standardised recording angles, it is possible to reliably identify the investigated vessel sections. In patients with subarachnoid haemorrhage it is possible to non-invasively detect and grade vasospasm and follow its individual course. Angiography and surgery can be reliably timed during a spasm-free interval. Preventive postoperative therapy following subarachnoid haemorrhage with hypervolaemia and hypertonia is simplified, as is the differential diagnosis as to whether secondary deteriorations are due to spasm or raised intracranial pressure. After extracranial/intracranial bypass operations, shunt patency and the effect of intracranial haemodynamics can be investigated without requiring angiography. Other fields of application concern the investigation of the evolution of haemodynamics after surgery on intracerebral arteriovenous malformations and for monitoring the cranial circulation in raised intracranial pressure.

Carotid Artery Diseases↗
PubMed1984

[Recurrence following burr hole trephination of chronic subdural hematomas].

In a consecutive series of 100 patients suffering from Chronic subdural haematomas, which were treated by burr-hole evacuation and closed external drainage, in 23 patients repeated operations became necessary. The reasons for further operations were: true recurrences in 11 cases, superimposed haematomas in five cases and haematomas on the opposite side in seven cases. All these patients were treated again by burr-hole evacuation and closed external drainage. In contrast to the common opinion craniotomy and removal of the membranes was not necessary in any case.

Aged↗
PubMedDate not supplied

[Pain reduction after cervical spine surgery. Outcome after implantation of a cervical wing cage in degenerative diseases of the cervical spine--a prospective study].

AIM: Surgery in cervical spine disease using titanium cages is a common procedure to reduce the pain and neurological deficits. This study was aimed to evaluate the results in pain reduction using the wing cage intraoperatively. METHOD: In this prospective study demographic data were noted, whereas special emphasis was placed on pain, which was noted using a visual pain scale and the prolo score, neurological deficits and the causing pathology. Furthermore, questions about the use of analgesics and the duration of pain were asked. After operation with insertion of a wing cage instead of the disk, a neurological investigation 6, 12 and 24 months later was done to evaluate the postoperative status. RESULTS: 54 patients underwent a cervical discectomy in 64 segments as therapy for neck pain or a radiculopathy caused by osteochondrosis or disc disorder. Patients with brachialgia profited most from the operation. Less improvement was seen in cases of osteochondrosis or combined pathology. CONCLUSION: Patients with pain caused by discs in the cervical spine, have better improvement than patients with other pathologies. This should be taken into account when choosing the mode of therapy.

Adult↗