Biomedical subjects

R Déry

Publications and source records attributed to R Déry.

At least 19 recordsLinked to original sources

PubMed1991

Air in the portal vein: sonographic and Doppler manifestations.

Three patients with portal venous gas (one with radiographic and computed tomographic findings) had similar sonographic and Doppler patterns in the portal vein (PV). These patterns consisted of hyperechogenic foci moving within the lumen of the PV, producing sharp bidirectional spikes superimposed on the usual Doppler tracing of the PV. An injection of 0.25-0.50 cm3 of air, oxygen, nitrogen, and carbon dioxide into the jejunal vein of nine dogs yielded identical portal venous sonographic and Doppler patterns. In addition, the liver parenchyma of the dogs became hyperechogenic after the injection of gas. Gas in the PV is accompanied by the following signs: echogenic, moving foci within the lumen of the PV; sharp spikes on Doppler spectral display; and hyperechogenic foci within the liver parenchyma.

Adult↗

PubMed1990

Temporal lobe abnormalities in panic disorder: an MRI study.

Brain mapping studies have shown abnormal changes in cerebral blood volume and oxygen consumption, or other neurophysiological abnormalities, in panic disorder (PD) patients. Because of these intriguing reports, we decided to assess the neuroanatomical aspects of patients with PD using magnetic resonance imaging (MRI). We included 31 consecutive cases with a diagnosis of PD according to the DSM-III criteria, and 20 controls. All subjects had to be right-handed and between 20 and 40 years of age. The usual exclusion criteria were applied. We carried out the MRI tests with a General Electric Signa Machine operating at 1.5 Tesla. Over 100 images were obtained per patient with an emphasis on assessing temporal lobe. There were no significant differences in age, gender, or weight between the patients and controls. We found a statistically significant higher number of abnormalities in PD patients (40%), as compared with the controls (10%). The most striking findings were focal abnormalities in the temporal lobes: areas of abnormal signal activity, and asymmetric atrophy of the temporal lobe occurred mostly on the right side. These results implicated the limbic system and may prove to be of particular relevance in panic and phobic disorders. However, the significance of our findings remains unknown and challenging. Further MRI studies in PD will be required for a better understanding of the illness.

Adult↗

PubMed1989

Correlation of severity of panic disorder and neuroanatomical changes on magnetic resonance imaging.

Thirty consecutive lactate-sensitive panic disorder patients were studied with magnetic resonance imaging (MRI) to investigate the relationship between temporal lobe abnormalities and panic disorder. Neuroanatomical abnormalities, most involving the right temporal lobe, were found in 43% of patients, compared with 10% of the control subjects. Patients with temporal lobe abnormalities were significantly younger at the onset of panic disorder and had more panic attacks compared with patients with normal MRI scans (p less than .05). These results suggest that panic disorder could be secondary to temporal lobe dysfunctions and that panic disorder patients with abnormal MRIs could have a worse prognosis than those with normal MRIs and would require long-term pharmacological treatment.

Adult↗

PubMed1987

Atrial-level shunts: sensitivity and specificity of MR in diagnosis.

Gated transverse cardiac magnetic resonance (MR) images from 31 patients with proved atrial septal defect (ASD) and from 33 control subjects were reviewed retrospectively by a panel of cardiac radiologists. The panel, by consensus, determined the presence and the type of ASD and assigned a confidence level for each diagnosis. A total of 97% of ASDs were correctly identified at high levels of specificity (primum, 100%; secundum, 96%; common atrium, 100%). Sensitivity and specificity are illustrated by receiver operating characteristic curves. Pulmonary veins were demonstrated at rates exceeding those reported for echocardiography. Further, all cases of anomalous pulmonary venous connection proved by angiography were also demonstrated by MR. Thus, MR has high sensitivity and specificity in the diagnosis and location of atrial-level shunts and is at least as accurate as, and possibly more accurate than, traditional techniques for the diagnosis of anomalous pulmonary venous connection.

Adolescent↗

PubMed1974