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Biomedical subjects

W Chowanetz

Publications and source records attributed to W Chowanetz.

22 records · Page 2Linked to original sources

[The so-called aging heart in 50- to 100-year-old subjects].

The cardiovascular system of aging people exhibits a number of morphological, functional and clinical special features. Alterations in shape, size and weight of the heart, alterations of coronary arteries, valves and aorta are accompanied by typical changes in several hemodynamics variables. The result is a diminution of the adaptation capacity to physical exertion and increased incidence of failure. However, heart failure cannot be regarded as a physiological process; it is caused by a coincidence of an increasing polypathy of the aging heart (coronary artery disease, arteriosclerosis, hypertrophy, valve-changes,disseminated degenerative changes) and the polypathy or multimorbidity of the whole aging organism. In advanced age the various forms of ischaemic heart disease (angina pectoris, infarction, failure, arrhythmias) show increasingly atypical courses, complications and a higher degree of mortality. Modern therapeutic measures like demand pacemakers or bypass operations are principally applicable. Our study of now 326 patients of very high age shows that the good state of their cardiovascular system (probably genetically determined) is mainly responsible for reaching high age.

Age Factors↗

[Missed gout].

Explore the source record for details and available documents.

Arteriosclerosis↗

Nasal admixture during mouth breathing in awake normal subjects.

We tested the flow-impeding properties of the nasopharynx in 27 healthy subjects with normal nasal resistance (mean +/- SD: 2.45 +/- 1.92 cmH20.l-1 X s). While the subjects inspired and expired deliberately through a rubber mouth-piece, a tight-fitting nose-mask was supplied with 100% O2 from a filled 30-1 rubber bag. Recording instantaneous FEO2 at the mouth was a sensitive indicator of whether nasal flow was present during the preceding inspiration. On a theoretical basis, we are describing a method of calculating the mean percentage of nasal admixture during inspiration. Fluctuations in FEO2 in relation to time revealed varying nasal flow in some individuals. The mean nasal admixture differed considerably between all subjects (mean +/- SD: 20.9 +/- 16.5%; range: 1-70%), showing no correlation to nasal resistance. Five of 27 subjects with a history of habitual mouth breathing had a significantly lower nasal admixture (2.5 +/- 1.7% vs 25.1 +/- 15.4%; p less than 0.005), with no statistical difference in nasal resistance. Present data indicate that upper airway patency is variable in normals during voluntary mouth breathing. We suggest that habitual mouth breathing with absence of nasal obstruction may be associated with velopharyngeal narrowing.

Adult↗