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Biomedical subjects

R Jensen

Publications and source records attributed to R Jensen.

At least 217 records · Page 12Linked to original sources
PubMed1980

Limb arthropathies and periarticular injuries in feedlot cattle.

Beginning summer 1977 and continuing through 4 consecutive seasons, we examined samples of at least 25, and a total of 106, lame limbs or joints from slaughtered beef cattle. Of this number about 64 (60%) were articular and 42 (40%) periarticular lesions. Fifty-three were caused by trauma and 9 by osteochondrosis. Stifle joints (40) and digital joints (19) were the most frequently affected articulations, and the humerus and femur were the most frequently fractured bones. Twenty joints, mostly stifles, had fibrinous arthritis, and Mycoplasma spp. were isolated from 11.

Animals↗
PubMed1978

Combination chemotherapy and radiation therapy of undifferentiated small cell bronchogenic carcinoma.

We reviewed 76 cases of small cell bronchogenic carcinoma seen at the University of South Florida Medical Center. One third of the 55 patients who have subsequently died did so within one month of diagnosis. Thirty-five patients were treated with cyclophosphamide, adriamycin, vincristine, and radiation therapy including prophylactic cranial irradiation. Of these 35 patients, 40% demonstrated a complete remission for a total objective response rate of 63%. The projected median survival of patients referred for study is 14 months. Improved survival was found in patients less than 60 years of age, with limited disease, who responded to treatment and in whom there were no violations of protocol. Patients treated with combination therapy appear to survive longer than untreated patients and those treated with radiation therapy alone. Toxicity was tolerable and there were no deaths related to treatment. Small cell bronchogenic carcinoma is a rapidly progressive systemic disease responsive to multimodality therapy with long-term survival in some patients.

Adult↗
PubMed1977

Mineralization in the midpalatal suture after orthodontic expansion.

A new method is described for an objective measurement of the mineralization in the anterior part of the midpalatal suture after its orthodontic expansion. The radioisotope 125I is used as radiation source and is placed intraorally in the same position on each measurement occasion. The extraoral part of the apparatus consisted of a scintillation crystal and a pulse-height analyzer to determine the number of roentgen quanta transmitted. The measurements showed that the mineral content within the suture rose rapidly during the first month after the completion of suture opening. In the bone beside the suture, the mineral content decreased sharply during the first month of measurement; later it returned to the initial level.

Child↗
PubMed1977

Determinants of the prescriptive zone of industrial workers.

The prescriptive zone is the range of climates in which man's body temperature is independent of climatic conditions. The environmental temperatures which define the upper limit of the prescriptive zone (ULPZ) at different work rates were determined in 46 clothed, healthy, male industrial workers; some of the men were job acclimated to heat and some were not. They performed a total of 653 work bouts of low, medium, or high intensity in environments ranging from 11 to 35 degrees C corrected effective temperature (CET) (8-37 degrees C wet bulb globe temperature). Heart rates (HR) and rectal temperatures (Tre) were measured after 1 h of work. The ULPZ was calculated from Tre data. HR's showed a similar pattern of response as Tre's except that the inflection point corresponding to the ULPZ occurred at different environmental temperatures at most of the experiment conditions. About one-third of the work bouts were performed in the summer months and the remainder in the winter. The ULPZ decreased with increasing work rates. At high, but not low, work rates, men who were exposed to heat in the performance of their jobs were more heat tolerant than men who were not heat acclimatized. Both groups were found to be more heat tolerant in the summer months than in the winter.

Acclimatization↗
PubMed1976

Shipping fever pneumonia in yearling feedlot cattle.

During each week of 1974, we surveyed, for illnesses and deaths, a continually changing population of yearling feedlot cattle that, for the year, totaled 407,000 animals. About 5.1% of the cattle sickened and, of these, 18.9% died. From the 3,943 fatalities, 1,988 necropsies were made. About 75% of the clinical diagnoses and 64% of the necropsy diagnoses were respiratory tract diseases; of the fatalities from respiratory tract diseases, 75% were attributed to shipping fever pneumonia. Nearly 72% of fatal cases of shipping fever pneumonia occurred during the first 45 days on feed. In the lungs of most cattle with shipping fever pneumonia, bronchiolitis, fibrinous exudate, colonies of microorganisms, lymphatic clots, intravascular clots, thromboses, and foci of necrosis were found. Pasteurella spp, Mycoplasma spp, and infectious bovine rhinotracheitis virus were isolated from pneumonic tissues. It was hypothesized that pathogenic Pasteurella spp and other microorganisms in nasal secretions transfer from the nasopharynx into the lungs by draining along the tracheal floor into ventral bronchi, bronchioles, and alveoli, and that pasteurella endotoxin, formed in infected lobules, thromboses and occludes lymphatics, capillaries, and veins and thereby causes ischemic necrosis.

Animals↗
PubMed1976

Diseases of yearling feedlot cattle in Colorado.

During all of 1974 we surveyed, for illnesses and deaths, about 407,000 yearling feedlot cattle. The morbidity was 5.1%, with a case mortality of 18.9% and a population mortality of 1.0%. Both morbidity and mortality were higher during fall and winter than during spring and summer. Of the 3,943 dead cattle, 1,988 were necropsied. The most prevalent diseases were: pneumonia, 48%; diphtheria, 6%; brisket disease, 6%; hemorrhagic colitis, 5%; riding injury, 4%; bloat, 3%; calculosis, 2%; endocarditis, 2%; abomasal ulcers, 2%; bovine viral diarrhea, 2%; embolic pulmonary aneurysm, 1%; and pulmonary edema, 1%.

Animals↗
PubMed1976

Atypical interstitial pneumonia in yearling feedlot cattle.

During each week of 1974, we surveyed, for illnesses and deaths, a constantly changing population of yearling feedlot cattle that, for the year, totaled 407,000 animals. From 3,943 fatalities, 1,988 necropsies were made; of this number, 106 (5.3%) had atypical interstitial pneumonia. The death rate was higher during summer and fall than during the other seasons and was evenly distributed throughout each of the 4 stages of fattening. Gross pulmonary lesions involved both lungs and were prominent throughout the caudal (diaphragmatic) lobes. Epithelialization, hemorrhage, fibrin, hyaline membranes, emphysema, bronchiolitis, and interstitial edema were common, whereas chromatin strands, bronchiolar edema, interstitial emphysema, and obliterating bronchiolitis were less common histopathologic features.

Animals↗
PubMed1976

Brisket disease in yearling feedlot cattle.

During all of 1974, we surveyed, for illnesses and deaths, about 407,000 yearling feedlot cattle maintained at 1,600 m altitude. Of 1,988 cattle necropsied, 116 (5.8%) had brisket disease. The malady occurred during all seasons but was most common throughout fall and winter. The gross changes were hypertrophy and dilatation of the right ventricle and generalizaed passive congestion. The postulated causative factors were high genetic susceptibility, rapid growth rate, previous mountain grazing, and hypoventilation with airway hypoxia.

Animals↗
PubMed1976

Bulling among yearling feedlot steers.

In a survey to determine the cause of illness and deaths among yearling feedlot cattle, bulling was found to be one of the major problems. During the years 1971-1974, 54,913 (2.88%) steers became bullers and represented an annual loss of around +325,000. Some of the causes of bulling were found to be hormones, either as implants or in the feed. In 1974, from 1,988 necropsies, it was determined that 83 steers died from riding injuries.

Anabolic Agents↗
PubMed1976

Fetal abomasal ulcers in yearling feedlot cattle.

During all of 1974, we surveyed, for illnesses and deaths, about 407,000 yearling feedlot cattle. From the 3,943 dead cattle, 1,988 necropsies were made; of this number, 31 (1.6%) had ulcers with fatal perforations or hemorrhages; a similar additional number of necropsied cattle had innocuous ulcers as incidental findings. Ulcers developed during all seasons and all stages of fattening, but were more common during the first 45 days of winter-initiated fattening than during other times. Perforations of the abomasal wall resulted in spillage of abomasal contents into the abdominal cavity and the development of peritonitis.

Abomasum↗
PubMed1976

Sudden deaths in yearling feedlot cattle.

A survey of the causes for fatal diseases of yearling feedlot cattle was conducted on more than 407,000 cattle during a 14-month period. Of the 4,260 (1%) cattle that died during this period, 1,358 (32%) were categorized as cases of "sudden death syndrome." Of the 11 most frequent causes of the syndrome, as determined at necropsy, only 4--bloat, pulmonary aneurysms, riding injury, and hemopericardium--were considered as short-course problems and true causes of sudden death. The largest number of cases of sudden death were attributed to pneumonia (113 animals). Consequently, the sudden death syndrome is a misnomer for many long-course diseases and, in some instances, a mask for neglect because, as clinically used, the name frequently includes cattle that have been sick, often with pneumonia, for several days.

Animals↗
PubMed1976

Bronchiectasis in yearling feedlot cattle.

Thoughout all of 1974, we surveyed, for illnesses and deaths, about 407,000 yearling feedlot cattle. From the 3,943 dead cattle, 1,988 necropsies were made; of the cattle necropsied, 32 (1.6%) had bronchiectasis. In this disease, the permanently dilated small bronchi and bronchioles, located in ventral parts of the lungs, were filled with accumulations of exudate and microorganisms, including Pasteurella hemolytica, Pasteurella multocida, Corynebacterium pyogenes, Escherichia coli, Salmonella anatum, Staphylococcus spp, and Mycoplasma arginini.

Animals↗
PubMed1976

Embolic pulmonary aneurysms in yearling feedlot cattle.

Throughout all of 1974, we surveyed, for illnesses and deaths, about 407,000 yearling feedlot cattle. Of 1,988 cattle necropsied, 25 (1.3%) had ruptured pulmonary aneurysms and an additional 4 had gross pulmonary emboli without rupture. The emboli originated from thrombi in the caudal vena cava where that vessel closely applies to the left border of the liver and where parenchymal abscesses had developed. The emboli had lodged in the pulmonary artery, weakened its wall, and led to saccular aneurysms. Infection weakened and blood pressure ruptured the saccule and opened the adjacent bronchi. Extravasated blood dissected the tunica adventitia, formed hematomas, poured into the bronchus, and was expelled from the larynx. A portion was swallowed into the rumen, and some was coughed and blown from the nose and mouth. Deaths were attributed to exsanguination and pulmonary incapacitation.

Aneurysm↗