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Biomedical subjects

D A Ellis

Publications and source records attributed to D A Ellis.

At least 55 records · Page 3Linked to original sources
PubMed1987

Use of radionuclide scanning in the preoperative estimation of pulmonary function after pneumonectomy.

Twenty eight patients with bronchial carcinoma were studied before pneumonectomy. Measurement of spirometric indices, static lung volumes, transfer factor (TLCO), and transfer coefficient (KCO) was undertaken before and four months after pneumonectomy. Fourteen of the patients also performed a symptom limited progressive exercise test on a cycle ergometer before and four months after pneumonectomy. All patients had standard xenon-133 ventilation and technetium-99m perfusion scans performed before operation. Eleven patients had krypton-81m ventilation scans in addition. Significant correlations were seen between changes in FEV1, TLCO and KCO and the preoperative function of the resected lung as determined by percentage preoperative perfusion to that lung (p less than 0.001). There were mean decreases in FEV1 of 22% and in vital capacity (VC) of 28.7% predicted. Estimation of postoperative FEV1 from the preoperative values showed equally good agreement with measured postoperative values whether 99mTc perfusion or 81mKr ventilation scans were used in the 11 patients in whom both scans were available. Significant correlations were seen between change in maximum exercise ventilation (VEmax) or maximum oxygen uptake (VO2max) after pneumonectomy and percentage preoperative perfusion to the resected lung (p less than 0.001). Estimation of postoperative maximum ventilation and maximum oxygen uptake from the postoperative values on the basis of 99mTc perfusion scans showed good agreement with observed values. Perfusion scans are useful in estimating not only the changes in spirometric indices that follow pneumonectomy for bronchial carcinoma but also changes in carbon monoxide transfer and exercise capacity.

Adult↗
PubMed1987

Surgical treatment of acne scarring: non-linear scar revision.

Non-linear scar revision techniques involve levelling facial skin. Classification as to the nature of the pitting allows the surgeon to select techniques to improve the facial cosmetic appearance. The types of intradermal pitting and subcutaneous atrophy along with nodular scarring produce the lack of levelling and the depression that the patients want corrected. The useful modalities available to level facial skin are dermal levelling, injectable substances, dermal punch grafting, excision and facelifting. The selection of these techniques is dependent on the above classification and the patient's desire for improvement.

Acne Vulgaris↗
PubMed1987

The geometry of alar base resection.

There are many types of alar base excisions. However, analysis of the nostril circumference into the columella, nostril sill, and the alar flare (the ovoid subset of the alar base esthetic unit) is critical in assessing the location and amount of circumference reduction in alar base excisions.

Humans↗
PubMed1986

The aging face.

Facial aging is a dynamic process which continues throughout adult life. Individuals are affected to a variable degree depending on facial motor habits, exposure and susceptibility to damaging ultraviolet radiation, smoking, and the microscopic tissue changes inherent to the aging process. Aside from avoiding smoking and utilizing sunscreens and other solar protection, there is little that can be done to prevent or retard the development of these changes. There is, however, a vast array of corrective procedures which may be utilized in a planned, sequential fashion to deal with age-related deformities as they occur.

Adult↗
PubMed1985

Adrenal glands in patients with congenital renal anomalies: CT appearance.

The CT appearance of the adrenal glands was investigated in 30 patients with congenital renal anomalies (17 cases of unilateral renal agenesis, 11 of inferior ectopy, and 2 of crossed fused ectopy). The ipsilateral adrenal was clearly identified in 83% of these patients; in all of them, the adrenal was a paraspinal disk-shaped organ, which appeared linear on CT. Conversely, the adrenals retained their normal shape in a control group of 20 patients with acquired renal atrophy or prior simple nephrectomy.

Adrenal Glands↗
PubMed1985

The analysis and correction of nasal columella deformity--a review.

Rhinoplasty surgeons must often adjust the nasal columella as part of a functional or cosmetic operative procedure and may, on occasion, be called upon to correct the columella as an isolated deformity. The anatomy of the nasal columella with its various components provides a framework for the classification and analysis of deformities of this structure. Discussion of the various approaches and techniques of correction of this deformity is undertaken. It is our intent to share a system of analysis and correction of columellar deformities to both simplify and improve the end result of undertakings for correction of this area of the nose as well as the whole nose.

Humans↗
PubMed1984

Collagen implant: an early assessment.

Injectable collagen has been used successfully to improve skin contour defects. This paper will briefly review the biosynthesis, the preparation, and the clinical application of this new material. Collagen is the major structural protein of the extracellular matrix and provides a scaffolding for the support cells. Skin collagen is composed of short fibriles grouped in bundles which are randomly orientated to provide strength and resiliency in all directions of the skin place.

Cicatrix↗
PubMed1984

Rehabilitation of the paralyzed lower lip.

There is a continuum of smiles from the one of the reserved Mona Lisa to a full dental smile where there is maximal exposure of teeth and full triggering of all the major and minor smile muscles. The ramus mandibularis paralysis is more obviously noted in the full dental smile. The ramus mandibularis paralysis is best corrected through a technique of wedge resection of the lower lip with a segmental sling to the nasolabila groove.

Facial Expression↗
PubMed1984

Narrowing of the wide nasal tip.

The causes of wide nasal tips include: 1) bulbous lateral crura; 2) wide arching between the medial and lateral crura; 3) thick skin; and 4) wide interdomal distance. In primary rhinoplasty, most tip width is found to be caused by the bulbous lateral crura and wide arching between the lateral crura of the lower lateral cartilages. In some patients the interdomal distance must be narrowed to give the esthetic desired result. An interdomal distance greater than 3 mm should be corrected. The technique of unilateral partial delivery of the right crus up to and including the dome, with removal of the soft tissue between the separated medial crura, is described as an efficient way of narrowing the interdomal distance. This technique was required in 5% of the cases.

Humans↗