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Biomedical subjects

L J Peterson

Publications and source records attributed to L J Peterson.

At least 19 recordsLinked to original sources
PubMed1992

Which antibiotic?

Explore the source record for details and available documents.

Bacterial Infections↗
PubMed1992

Acid-base changes in the running greyhound: contributing variables.

To determine the factors responsible for changes in [H+] during and after sprint exercise in the racing greyhound, Stewart's quantitative acid-base analysis was applied to arterial blood plasma samples taken at rest, at 8-s intervals during exercise, and at various intervals up to 30 min after a 402-m spring (approximately 30 s) on the track. [Na+], [K+], [Cl-], [total Ca], [lactate], [albumin], [Pi], PCO2, and pH were measured, and the [H+] was calculated from Stewart's equations. This short sprint caused all measured variables to change significantly. Maximal changes were strong ion difference decreased from 36.7 meq/l at rest to 16.1 meq/l; [albumin] increased from 3.1 g/dl at rest to 3.7 g/dl; PCO2, after decreasing from 39.6 Torr at rest to 27.9 Torr immediately prerace, increased during exercise to 42.8 Torr and then again decreased to near 20 Torr during most of recovery; and [H+] rose from 36.6 neq/l at rest to a peak of 76.6 neq/l. The [H+] calculated using Stewart's analysis was not significantly different from that directly measured. In addition to the increase in lactate and the change in PCO2, changes in [albumin], [Na+], and [Cl-] also influenced [H+] during and after sprint exercise in the running greyhound.

Acid-Base Equilibrium↗
PubMed1991

Physiological changes in the running greyhound (Canis domesticus): influence of race length.

1. Racing greyhounds were allowed to run 402 m, 503 m, and 704 m to determine the influence of increased race length on physiological changes during and after exercise. 2. Plasma and whole blood variables that changed significantly with increased race length were [K+], [total protein], [lactate], hematocrit, and arterial pH. 3. Those variables that changed with increased race distance showed no indication of reaching a plateau; thus, the maximum changes that these variables might undergo with longer exercise duration remains unknown.

Animals↗
PubMed1989

A comparison of the stress transfer characteristics of a dental implant with a rigid or a resilient internal element.

It has been suggested that there is a unique set of problems associated with joining an implant and a natural tooth with a fixed partial denture. The manufacturer of the IMZ implant system claims that this procedure can be accomplished successfully because of the planned stress-distributing characteristics of their resin internal (intramobile) element. This study compared the difference in the stress patterns generated in photoelastic plastic by an IMZ implant with a resilient or a rigid internal element. Under a standardized cantilever load, the stress patterns were photographed in the field of a circular polariscope. The total stress areas were calculated and a statistical comparison performed. The static load conditions of the model demonstrated no statistical difference between the area of stress pattern generated by an IMZ implant with or without a resilient internal element. Moreover, a single load produced the same deflection of the cantilever beam regardless of which element was interposed.

Alveolar Process↗
PubMed1989

Early soft tissue ingrowth into porous block hydroxyapatite.

A dog model was used to determine the rate of soft tissue infiltration into porous block hydroxyapatite (PBHA) in order to provide a scientific basis for treatment of exposed implants. Ten mongrel dogs underwent alveolar ridge augmentation with PBHA and were killed at various times up to 21 days. Significant soft tissue ingrowth had occurred by 14 days and was complete by day 21. Bone formation was also seen as early as 14 days.

Alveolar Ridge Augmentation↗
PubMed1987

Use of cricothyroidostomy in oral and maxillofacial surgery.

Surgical entry into the upper airway is not only important in emergency situations but also in the treatment of certain elective maxillofacial procedures. The procedure of choice by which surgical access is gained has traditionally been a tracheostomy. Although a cricothyroidostomy is easier and quicker to perform, with a higher degree of safety, it has generally been relegated to only emergency situations. The purpose of this paper is to present the anatomy, indications, and surgical technique of cricothyroidostomy. It is concluded that cricothyroidostomy, and not tracheostomy, is the preferred procedure for surgical establishment of an upper airway, either in elective maxillofacial surgical procedures, or in an emergency situation.

Cricoid Cartilage↗
PubMed1979

Delayed healing of mandibular fracture in idiopathic myxedema.

Lack of adequate amount of thyroid hormone may interfere with healing. A patient in whom a fracture of the mandible failed to heal in the 2 years following surgical treatment is presented. When thyroid hormone supplementation was introduced, the fracture progressed to union. The physical findings of hypothyroidism and the role of thyroid hormone in healing are discussed.

Antibodies↗
PubMed1979

Ultrasonic localization of a non-palpable testis tumor.

A young man was found to have a retroperitoneal seminoma and normal testicles by palpation. Initial diagnosis was an extratesticular primary germ cell tumor until ultrasound examination detected a lesion in the left testicle. A left radical orchiectomy was done and a seminoma of the testicle was found. We recommend ultrasound examination of the testicles to demonstrate occult testicular tumors when faced with the possibility of an extratesticular primary germ cell tumor.

Adult↗