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Biomedical subjects

K Hein

Publications and source records attributed to K Hein.

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

[Computed tomography of atelectasis. A comparative experimental study].

After breathing pure oxygen, total atelectasis of one lung was produced in ten dogs; its development and regression was followed by CT and by conventional radiology. 30 seconds after cessation of ventilation, it was possible to show a rise in CT density of the atelectatic lung from -764 +/- 32 HU to -739 +/- 49 HU. The average time from the cessation of ventilation to total atelectasis averaged 5.5 +/- 1.1 minutes. The earliest sign on conventional radiographs was often seen after 30 seconds and usually after 60 seconds and consisted of mediastinal displacement. Extensive atelectasis regressed in only one out of six animals within one hour after resuming ventilation. The experimental methods and results and the significance of the physiological findings in a clinical context are discussed.

Animals↗
PubMed1986

[Computed tomography of lung contusion. An experimental study].

A new experimental model has been developed to determine whether computed tomography has any advantages for the investigation of lung contusions. In 27 dogs, chest wall deformation was produced at speeds varying from 17.3 m/sec to 45.7 m/sec, leading to lung contusion. After the injury, 27 out of 27 (100%) CT examinations demonstrated the contusions, but only nine out of 24 (37.5%) were seen on conventional radiographs. In contrast to conventional radiography, which either failed to show the presence of a contusion, or which under-estimated the extent by more than one cm, in more than half the cases CT agreed with the pathological findings in more than 90%. No lung contusions were found at autopsy which had not been demonstrated by CT.

Animals↗
PubMed1982

Self-detection of a breast mass in adolescent females.

The frequency of self-discovered breast masses in adolescent females has not previously been described. The histologic diagnosis rather than the means of detection has been the focus of previous surveys. Seven characteristics of 95 patients admitted from 1968-1979 for the evaluation of a breast mass were delineated. The mean age at hospitalization was 15.9 years (range 12-20). The delay from detection to hospitalization was 7.2 months (range 0.5-72). In 77 cases the mass was detected by the patient; 11 were found during a physician examination, 4 by a family member, and 3 by an unrecorded source. Diagnoses were fibroadenoma (71), abscess (11), cyst (9), lipoma (2), and cystosarcoma phyllodes (2). The median length of the masses was 2.6 cm, width 2.3 cm, with a median mass area (diameter x length) of 6 cm2. When patients were compared for age, delay in hospitalization, means of detection, family history, and mass size, the girls with abscesses were younger and had a shorter time delay before hospitalization. Self-discovery was the means of detection in 77 of 95 (81%). The means of detection is an important factor to consider in weighing the merits of teaching breast self-examination procedures to adolescent females.

Abscess↗