PubMed Health⌕ Search

Biomedical subjects

N Underwood

Publications and source records attributed to N Underwood.

10 recordsLinked to original sources
PubMed1997

Is kidney length a good predictor of kidney volume?

Kidney length is commonly used to determine kidney size; however, its relationship to kidney volume is not well established. This study evaluated the association between kidney length and kidney volume. Eighteen healthy adults (9 men and 9 women) consented to take part in this prospective study; all 18 underwent spiral computerized tomography (CT) of the kidneys, 14 of 18 also underwent kidney ultrasound. Kidney volume was measured by totaling the areas of the CT scan cuts, and kidney length was measured both on the kidney ultrasound and on the CT scan. Each independent variable, CT length (CTL) and ultrasound length (USL), was regressed against the dependent variable, kidney volume. Kidney length explained only 10% of the variability of the volume, although length x width was a better predictor of kidney volume (r = 0.72, P < 0.001). It was concluded that kidney length does not reliably predict kidney volume and that other methods, both clinical and radiologic, should be considered when a more exact determination of renal volume is clinically relevant.

Adult↗
PubMed1996

Further Evidence That Orthographic Rime Usage in Nonword Reading Increases with Word-Level Reading Proficiency

This research investigated children's use of orthographic rime correspondences in nonword reading in association with word-level reading skills. Experiment 1 demonstrated an increase in the use of orthographic rime correspondences in two independent nonword reading tasks from second to fourth grade. There was no further increase from fourth to sixth grade. In an ambiguous nonword reading task, where grapheme-phoneme and orthographic rime correspondences yielded conflicting pronunciations, the use of orthographic rime correspondences varied with the orthographic onset employed. The use of orthographic rime correspondences in reading ambiguous nonwords was more strongly associated with word-level reading skills than was the use of grapheme-phoneme correspondences. Experiment 2 replicated the main findings of Experiment 1 concerning the association between word-level reading skills and the use of orthographic rime correspondences in nonword reading within second-grade children. These findings suggest that the use of orthographic rime correspondences in the phonological recoding process increases with word-level reading proficiency.

Journal Article↗
PubMed1992

Quality of life on antihypertensive therapy: a double-blind trial comparing quality of life on pinacidil and nifedipine in combination with a thiazide diuretic. European Pinacidil Study Group.

The quality of life (QL) was evaluated in a 6 month double-blind trial in six European countries. Patients with a sustained supine diastolic blood pressure (SDBP), phase V, of 95 mm Hg or more on bendrofluazide, 5 mg daily (or an equivalent dose of a thiazide diuretic) were randomised to additional pinacidil (n = 127), 25 mg up to 100 mg daily, or nifedipine (n = 130), 20 mg up to 80 mg daily. The treatment groups were similar at entry for QL scores, average DBP of 103 +/- 6 (SD) mm Hg, and average age of 56 +/- 10 (SD) years. Eighteen patients on pinacidil and 12 on nifedipine withdrew due to side effects, such as oedema (both drugs) and flushing (nifedipine). The maximum antihypertensive effect was achieved within 6 weeks and maintained, resulting in a significant fall in SDBP of 13.7 mm Hg on pinacidil and 15.5 mm Hg on nifedipine at the end of the trial. There was no significant difference in the antihypertensive effect. The target SDBP was achieved in 57% of pinacidil-and 63% of nifedipine-treated patients. The average number of symptomatic complaints fell in both groups, with significant decreases in the reporting of blurred vision and headaches on nifedipine. Complaints of growth of body and facial hair increased on pinacidil but there were no significant between-drug comparisons with respect to side effects. In measures of psychological well being, patients on pinacidil showed a significant (p less than 0.05) improvement in total and cognitive function scores compared to nifedipine.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗