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Biomedical subjects

J A Verschakelen

Publications and source records attributed to J A Verschakelen.

45 records · Page 3Linked to original sources
PubMed1989

The effect of breath size and posture on calibration of the respiratory inductive plethysmograph by multiple linear regression.

The accuracy of the respiratory inductive plethysmograph (Respitrace) for estimation of lung volume changes during quiet breathing and vital capacity (VC) manoeuvres was evaluated using a variant of the multiple linear regression (MLR) technique. We applied this technique successively on quiet breathing, on the whole VC, and on each of the four quarters of the VC separately. This was carried out in six body positions. The best estimation of tidal volumes was obtained when calibration factors calculated during quiet breathing were used. The best estimation of VC was obtained when the calibration factors were adapted to the level of lung inflation. These results indicate that, using a single position MLR calibration method, the Respitrace measures tidal and VC mouth volumes very accurately. The accuracy of this MLR method for estimation of the rib cage and abdominal contributions was validated by comparison with isovolume calibration factors. Both techniques gave very similar results during tidal breathing. However, the MLR calibration factors may have no physiological meaning (i.e. for volume partitioning) when they are calculated from VC manoeuvres, in which more than two degrees of freedom are involved.

Abdomen↗
PubMed1986

Rounded atelectasis of the lung: diagnosis on conventional radiology and CT.

Rounded atelectasis is a radiological diagnosis and has to be differentiated from other mass-like opacities in the dorso (basal) part of the chest. Differential diagnosis must first be made with malignant pleural and pulmonary tumors. Specific radiological features such as irregular pleural thickening and the "comet-tail" sign help to make the diagnosis and to avoid unnecessary surgery. CT may be very helpful but frontal or sagittal conventional tomography will often be more diagnostic.

Female↗
PubMedDate not supplied

Right atrial tumor arising on an atrial septal aneurysm. Assessment by MR imaging.

An elderly women presenting with transient ischemic events underwent transesophageal echocardiography, which detected an aneurysm of the interatrial septum. A tumor protruding from the right atrial aspect of the aneurysm also was found incidentally. Not only was magnetic resonance (MRI) imaging helpful in better characterizing the aneurysm, but also the use of gadolinium diethylaminetriamine pentaacetic acid permitted differentiation between the tumor and adherent thrombus. To the best of our knowledge, this represents the first report of a tumor arising from an atrial septal aneurysm.

Aged↗
PubMedDate not supplied

Lung infection in radiology: a summary of frequently depicted signs.

For most clinicians, the definition of pneumonia is the presence of an abnormal opacity on chest X-ray and symptoms of respiratory infection such as cough, mucus production, fever. The radiological signs of infection of the lower bronchial tree can be covered by other lung diseases and these signs can mimic also other lung diseases. A chest X-ray is a first chosen step in radiological imaging in patients suspected of a pulmonary infection. Only when symptoms persist and/or become worse or when the radiological imaging is unclear, a spiral CT or HRCT of the chest will be taken in consideration. The role of medical imaging in pulmonary infection is to determine the presence, localisation and extent of the infection, to detect predisposal factors, to detect complications and in the follow-up of the infection. The radiological signs are often not very typical and they have also a limited value in predicting the causal organism. However there are some radiological signs, which are very suggestive in predicting the causal organism or in predicting the way of spread of the infection.

Adolescent↗