Nihon Kyōbu Shikkan Gakkai zasshi
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Hypoxemia is an important issue for those who manage patients with respiratory failure. Pulse oximetry is a non-invasive method for monitoring arterial oxygen saturation. ⋯ However, finger probes are not suitable for long-term monitoring: they interfere with the activities of daily life and are unstable because of finger movement. Smaller and more comfortable devices may be developed in the near future.
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Nihon Kyobu Shikkan Gakkai Zasshi · Dec 1994
Clinical Trial[Usefulness of twenty-four-hour home monitoring of oxygen saturation in patients with chronic obstructive pulmonary disease].
The clinical usefulness of 24 hr home monitoring of oxygen saturation (SaO2) with pulse oximeter was studied in 48 outpatients with COPD. In addition, doppler echocardiography for measurement of acceleration time (AcT), which inversely correlates with mean pulmonary arterial pressure, a 6-minute walk test, and an exercise study on a bicycle ergometer were performed in 26, 17, and 14 patients, respectively. Nadir SaO2 and the total time during which SaO2 was below 90% were calculated to estimate diurnal and nocturnal oxygen desaturation (diurnal nadir SaO2, diurnal TSaO2 < 90%, nocturnal nadir SaO2, and nocturnal TSaO2 < 90%). ⋯ Diurnal nadir SaO2 was similar to nadir SaO2 during the exercise tests. AcT, hemoglobin, and hematocrit correlated with diurnal oxygen desaturation but not with nocturnal oxygen desaturation. From the above findings, we conclude that pulmonary hypertension may be associated with diurnal oxygen desaturation, and that home monitoring of SaO2 is useful for the detection of oxygen desaturation not predicted from dyspnea grade and PaO2 while awake.
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Nihon Kyobu Shikkan Gakkai Zasshi · Dec 1994
Case Reports[A case of acute idiopathic mediastinitis that responded rapidly to treatment].
A 50-year-old man had a feeling of a foreign substance such as fish bone in his throat at breakfast. The feeling gradually changed to retrosternal pain and pain on swallowing, so he went to hospital, but the results of all examinations were normal. The next day he was referred to our emergency center because of the increasing pain and disturbance in swallowing. ⋯ Some antibiotics were given, based on the diagnosis of acute mediastinitis. The pain gradually subsided, and the tumorous shadow was obscured, without mediastinal drainage. Prompt therapy resulted in rapid improvement, and the patient was discharged on hospital day 23.
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Nihon Kyobu Shikkan Gakkai Zasshi · Dec 1994
[Relationship between power spectra of breath sounds and inspiratory flows at different frequencies].
Regional ventilation and changes in airway caliber have been studied by analysis of breath sounds. The aim of this study was to find which frequency band is most suitable for such purposes. The subjects were 19 healthy men. ⋯ When the data contaminated by heart sounds and those recorded late in inspiration were excluded the correlations at frequency bands below 150 Hz improved. The slope of log (power)/log (flow) was about 4 for the bands from 100 to 300 Hz, but it became steeper (4 to 6) for higher frequency bands. This means that the power spectra were proportional to the fourth power of the airflow rate for bands below 300 Hz, but the relation was from the fourth to the sixth power for higher frequency bands.(ABSTRACT TRUNCATED AT 250 WORDS)