Biomedical subjects

T Haffke

Publications and source records attributed to T Haffke.

6 recordsLinked to original sources

PubMed2004

Approach-related complications of transthoracic spinal reconstruction procedures.

Direct surgical repair of instabilities of the anterior spinal column has gained in importance. New techniques and instruments have led to better operative results. Inspite of the growing number of interventions at the anterior spinal column only little data is available on the typical intra- and postoperative complications of these anterior approaches Between 4/1998 and 8/2002, 85 patients in two neurosurgical centres were treated using an anterolateral transthoracic approach for various lesions of the thoracic and thoracolumbar spine. We used a minithoracotomy with video-endoscopic guidance in 75 of these patients. Intra- and postoperative complications were evaluated retrospectively. Two operations had to be abandoned, in all other cases surgery was performed as planned. Postoperatively, eleven patients complained of temporary intercostal neuralgia (12.9%), two patients (2.3%) had a pulmonary insufficiency which was treated conservatively, another patient needed drainage of a pleural effusion. One intraoperative injury to the thoracic duct was treated conservatively, one hernia of the abdominal wall had to be corrected surgically. Relevant injuries to the vessels did not occur, blood loss was 520 ml on average. There was no surgical mortality; one revision surgery had to be performed because of bone graft dislocation. The rate of severe approach-related complications was 4/85 = 4.7% (two abandoned procedures, one injury to the thoracic duct, one abdominal hernia). Transthoracic anterolateral stabilisation via a minithoracotomy with video-endoscopic guidance is an effective surgical approach to treat instabilities of the anterior parts of the thoracic spine and the thoracolumbar area with low complication rates.

Adolescent↗

PubMed2001

Comparison of 2-D turbo spin echo and 3-D gradient echo sequences for the detection of the trigeminal nerve and branches anatomy.

The aim of this study was to assess the detectability of the trigeminal nerve and its branches using T1 weighted (w.) 3-D magnetization prepared rapid gradient echo (MP-RAGE), T2* w. 3D CISS and T2 w. 2-D turbo spin echo MR sequences. Thirty healthy volunteers were examined for this purpose using a 1.5 Tesla MR unit. The detectability of the trigeminal nerve and Gasser's Ganglion, i.e. structures that are surrounded by liquor was best using 3-D CISS. In the case of the ophthalmic, maxillary and mandibular nerves, the T1 w. 3-D MPRAGE was significantly better than T2* w. CISS and T2 w. 2-D turbo spin echo. The latter yielded the poorest results. We conclude that both high resolution T2* w. and T1 w. 3-D sequences are necessary in order to detect the liquor-surrounded trigeminal nerve and its soft tissue-surrounded branches. We would therefore recommend the inclusion of constructive interference in steady state (CISS) and MP-RAGE in a MR imaging protocol of the trigeminal nerve and its branches.

Adult↗

PubMed2001

Visualization of the IXth to XIIth cranial nerves using 3-dimensional constructive interference in steady state, 3-dimensional magnetization-prepared rapid gradient echo and T2-weighted 2-dimensional turbo spin echo magnetic resonance imaging sequences.

OBJECTIVE: The purpose of this study was to evaluate the visibility of the IXth to XIIth cranial nerves using different magnetic resonance sequences. Thirty healthy volunteers underwent magnetic resonance imaging at 1.5 T using 3-dimensional constructive interference in steady state (CISS) sequence (TR = 17 ms, TE = 8.08 ms, alpha = 70 degrees), 3-dimensional magnetization-prepared rapid gradient echo (MP-RAGE) sequence (TR = 11.08 ms, TE = 4.3 ms, alpha = 15 degrees), and T2-weighted (w) 2-dimensional turbo spin echo (TSE) sequence (TR = 4000 ms, TE = 102 ms, alpha = 180 degrees, slice thickness = 2 mm). Visibility of the IXth to XIIth cranial nerves in each sequence was evaluated by consensus of 2 radiologists using an evaluation scale from 1 (excellently visible) to 5 (not visible). A correlation with anatomic specimens was made. The 3-dimensional CISS sequence provides best resolution of the IXth to XIIth cranial nerves and their relation to surrounding structures. Additional information is given by the 3-dimensional MP-RAGE when nerves are surrounded by soft tissues. Using the T2w 2-dimensional TSE sequence, even whole nerves cannot be visualized due to intersection gap and partial volume effects. However, even in 3-dimensional high-resolution sequences, segments of nerves are not always visualized. A combination of 3-dimensional CISS and 3-dimensional MP-RAGE proved to be useful to visualize the IXth to XIIth cranial nerves, whereas the 2-dimensional technique failed. Further investigations using 3-dimensional MP-RAGE with contrast medium should be performed in the case of abnormality.

Accessory Nerve↗

PubMed2000

MRI detection of olfactory bulb and tract.

Thirty healthy volunteers underwent MRI with 3D MP-RAGE, 3D CISS and 2D turbo spin echo sequences to compare the detectability of olfactory fibers, bulb, tract, and sulcus. The overall detectability was slightly better using MP-RAGE compared with CISS. Both 3D sequences were superior to 2D turbo spin echo. We therefore recommend including the MP-RAGE sequence in an MR imaging protocol of the olfactory nerve.

Adolescent↗

PubMed2000

Comparison of a T2* w. 3D CISS and a T2 w. 3D turbo spin echo sequence for the anatomical study of facial and vestibulocochlear nerves.

Thirty healthy volunteers were examined with a T2* w. 3D CISS and a T2 w. 3D turbo spin echo (TSE) sequence in order to compare the facial and vestibulocochlear nerve detectability in the cerebellopontine angle and the internal auditory canal. CISS was significantly better than 3D TSE for nerve detectability in the cerebellopontine angle and equally as good as 3D TSE in the internal auditory canal. We would therefore recommend the inclusion of CISS in an MR imaging protocol of the facial and vestibulocochlear nerves.

Adolescent↗

PubMedDate not supplied

Comparison of 2D and 3D MRI of the optic and oculomotor nerve anatomy.

A total of 30 healthy volunteers underwent magnetic resonance imaging (MRI) with T1 weighted (w.) 3D magnetization prepared rapid gradient echo (MP-RAGE), T2 w. 2D turbo spin echo (TSE) and T2* w. 3D constructive interference in steady state (CISS) sequences to evaluate the detectability of the optic, oculomotor, trochlear and abducens nerves. CISS yielded the best results for the trochlear and abducens nerve, MP-RAGE for the optic chiasm and tract. The optic and oculomotor nerves were very well detectable using both CISS and MP-RAGE without any statistically significant difference between the two.

Abducens Nerve↗