Biomedical subjects

Janet A Wilson

Publications and source records attributed to Janet A Wilson.

22 records · Page 2Linked to original sources

PubMed2002

Swallow-induced alterations in breathing in normal older people.

Respiratory parameters in 29 normal older subjects (mean age-73 years, SD = 5.7) were studied at rest, during single water swallows, and in continuous drinking. Respiration was recorded by intranasal air pressure changes and the moment of swallowing by pharyngoesophageal manometry. Compared with respiration at rest, respiratory rate increased immediately after 5 mL swallows as duration of breath cycles decreased from a mean of 3.8 s at rest to 3.5 s after swallowing (p = 0.003), but regularity of respiration was maintained. Deglutition apnea showed a trend toward increasing duration from a median of 1.06 to 1.24 s (p = 0.096) as bolus volume increased from 5 to 20 mL. Oxygen saturation levels were also compared, with a median fall of 2% during swallowing, but with larger and unexplained falls in several subjects. Direction of airflow monitoring showed 91% of single 5 mL swallows were followed by expiration, with postswallow inspiratory breaths occurring in 41% of subjects. Continuous swallowing of 100 mL of water from a cup and straw was typically performed with a pattern of multiple swallows per breath, with expiration occurring after 78.5% (cup) and 63.5% (straw) of swallows. This definition of swallowing-induced respiratory changes in normal older people forms a valuable basis for future comparison with elderly dysphagic patients.

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PubMed2002

Resting respiration in dysphagic patients following acute stroke.

The aim of this study was to examine respiration characteristics at rest in healthy volunteers and patients with poststroke dysphagia, using a simple notebook computer-based system. Eighteen patients (age range=51-82 years) with dysphagia poststroke and 50 healthy volunteers (age range=20-78 years) were recruited. The patient group had a wide range of stroke severity as assessed using the Scandinavian Stroke Score (SSS 6-51) and Barthel Index (BI 2-20). Length of breathing cycle, rate, and a measure of the variability of the cycle length were examined. The patient group had a shorter mean cycle length (2.93 s compared with 3.91 s, p < 0.01) and hence faster respiration rate (0.35 Hz compared with 0.26 Hz, p < 0.01). The control group showed greater variability in the cycle length (10.78% compared with 6.56%, p = 0.01). There was no correlation between the SSS and BI and resting respiration variables. This suggests that it is not stroke severity alone that affects breathing. The differences observed in resting respiratory rate suggest that respiratory monitoring as a useful adjunct to the clinical bedside assessment warrants further investigation.

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PubMed2002

Swallow respiration patterns in dysphagic patients following acute stroke.

The aim of this study was to examine swallow respiratory characteristics using a notebook computer system. A relatively simple system assessing easily identifiable features is more likely to be incorporated into everyday clinical practice. Eighteen patients (age range = 51-82 years) with dysphagia poststroke and 50 healthy volunteers (age range = 20-78 years) were recruited. The patient group was less likely to always breathe out postswallow on water (9/15 cf 46/49), and some did not breathe out immediately postswallow at all (3/15 cf 0/49, p < 0.01). The pattern was similar with yogurt. Multiple swallowing was identified in the patient group and surprisingly with a large number of the volunteers for all bolus types but was more common in the patient group (p < 0.01). This trait is usually attributed to impaired swallows; that it is prevalent in the normal population has implications for using it as a dysphagia marker in clinical assessments. Yogurt has intrinsic features that increase multiple swallowing and caution should be used when identifying an impairment based on multiple swallowing with such a test substance. In the control group there was a high correlation of swallow apnea on 5 mL of water compared with 20 mL of water (r = 0.759, p < 0.01) and 5 mL of yogurt (r = 0.871, p < 0.01), indicating a possible individual swallow respiration pattern. This was also evident in the patient group. No significant difference in length of swallow apnea was found between the two groups. No evidence was found to link swallow respiration characteristics with aspiration as identified on simultaneous videofluoroscopy. The patient group had a wide range of impairments which suggests that stroke severity is not the sole determinant of swallow respiratory changes.

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PubMed2002

Characterization of effective primary voice therapy for dysphonia.

Despite advances in the development of voice outcome measures, there is no methodology to define and quantify the elements of the complex process of speech therapy. The components of therapy given by one therapist to the intervention limb of a controlled trial were characterized according to a list of five minutes. The intervention was of proven benefit compared with a control period of observation. Indirect approaches comprised two thirds of therapy time. The types and duration of intervention were assessed but no treatment category seemed more associated with a favourable outcome. The design shows that it is possible to perform a prospective, structured analysis of the components of voice therapy. The method appears viable for the future comparison of the widely varying techniques current in voice therapy practice.

Adolescent↗