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Biomedical subjects

R Riley

Publications and source records attributed to R Riley.

At least 91 records · Page 5Linked to original sources
PubMed1984

Obstructive sleep apnea and abnormal cephalometric measurements. Implications for treatment.

The position of the hyoid bone, which anchors much of the tongue musculature, is often abnormally low in patients with obstructive sleep apnea syndrome (OSAS). Cephalometric measurements, frequently used to measure SNA and SNB angles, can also provide information on the posterior airway space (PAS), the mandibular plane, and the hyoid bone. This information is useful in determining the appropriate surgical treatment for OSAS patients.

Adult↗
PubMed1983

Cephalometric analyses and flow-volume loops in obstructive sleep apnea patients.

Fifteen patients with obstructive sleep apnea syndrome (OSAS) and 10 controls were studied. Polygraphic monitoring during sleep confirmed the presence or absence of OSAS. Ten OSAS patients and five controls had cephalometric analysis and 12 OSAS patients and five controls had a flow-volume loop study during wakefulness. Seven OSAS patients were submitted to both analyses. Flow-volume loops were unable to detect extrathoracic airway obstruction in six out of 12 OSAS patients. One control was found with positive results. Six out of seven subjects with positive flow-volume loops were overweight (greater than or equal to 30% ideal weight). Cephalograms were very useful in demonstrating mandibular deficiencies in OSAS patients. The length of the soft palate and the position of the hyoid bone, together with the measurement of the posterior airway space, are criteria of great interest in OSAS patients. Cephalometric analysis is recommended in all OSAS patients scheduled for surgical procedure. None of these tests, however, whether alone or in combination, is capable of identifying all cases of OSAS.

Adolescent↗
PubMed1983

Involuntary hospitalization in Canadian psychiatric inpatient facilities, 1970-1978.

This study is concerned with providing quantitative information on involuntary hospitalization of the mentally ill in Canada. It presents national statistical data on involuntary hospitalization to provincial mental and psychiatric hospitals, and psychiatric units of general hospitals for the period 1970-1978. The data used are based on the statistical information on psychiatric inpatients collected by the Mental Health Program of Statistics Canada for the period 1970-1978. The data indicate a moderate decline in involuntary admission rates. Men had consistently higher involuntary admission rates and women had consistently higher voluntary admission rates for the same period. Of the total commitments 22% were to psychiatric units of general hospitals. A high commitment rate was found for the elderly. As this is the first national quantitative analysis, both in Canada and in the international literature, the information presented should provide a useful objective perspective for a historical review of involuntary admissions to mental and psychiatric hospitals and psychiatric units of general hospitals.

Adolescent↗
PubMed1977

A first view of the meiotic process.

In this introductory paper we have highlighted some aspects of the meiotic process which seem important to us and about which some especially interesting features have been discovered. These include the switch from mitosis to meiosis, premeiotic DNA synthesis, association of the chromosomes with the synaptonemal complex, the nature of chromosome homology in relation to chromosome pairing, the process of chromosome pairing, the regulation of meiosis as a developmental process and the process of recombination. We have indulged in speculation in the hope that it will stimulate additional discussion and research into these crucial meiotic cell divisions which link the generations in higher organisms.

Animals↗
PubMed1977

Inferences from genetical evidence on the course of meiotic chromosome pairing in plants.

Meiotic chromosome pairing is a process that is amenable to genetic and experimental analysis. The combined use of these two approaches allows for the process to be dissected into several finite periods of time in which the developmental stages of pairing can be precisely located. Evidence is now available, in particular in plants, that shows that the pairing of homologous chromosomes, as observed at metaphase I, is affected by events occurring as early as the last premeiotic mitosis; and that the maintenance of this early determined state is subsequently maintained by constituents (presumably proteins) that are sensitive to either colchicine, temperature or gene control. A critical assessment of this evidence in wheat and a comparison of the process of pairing in wheat with the course of meiotic pairing in other plants and animals is presented.

Cell Division↗