| English |
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| Title | Preoperative non-invasive assessment of stress response to breath-holding test |
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| Subtitle | |
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| Authors | Ken Yamaura*, Sumio Hoka**, Junichi Yoshimura*, Shosuke Takahashi* |
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| Organization | *Department of Anesthesiology and Critical Care Medicine, Faculty of Medicine, Kyushu University, **Department of Anesthesiology, Kitasato University School of Medicine |
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| Journal | Circulation Control |
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| Volume | 25 |
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| Number | 3 |
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| Page | 272-275 |
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| Year/Month | 2004/ |
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| Article | Original article |
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| Publisher | Japan Society of Circulation Control |
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| Abstract | The purpose of this study was to evaluate circulatory and respiratory responses to a breath-holding stress test in surgical patients at the bed-side using continuous and non-invasive monitoring with arterial tonometry and pulse oxymetry. Sixty-one patients were assigned into four groups：normal healthy patients(Cont), elderly patients(Elder), hypertensive patients(HT)and diabetic patients(DM). The breath-holding stress test was conducted in the supine position at the functional residual capacity level and in room air. Breath-holding time, changes in heart rate(HR), mean arterial pressure(MAP), arterial oxyhemoglobin saturation using a pulse oxymeter(SpO2)and the recovery time of SpO2 were measured. Breath-holding time was significantly shorter in the HT group(30±2.0sec, p<0.05)and tended to be shorter in the Elder group(31±3.0sec, p=0.08)compared with the Cont group(41±2.9sec). The maximum mean arterial blood pressure(Max-MAP)was higher in the Elder(105±4.0mmHg)(p<0.05)and HT(128±5.6mmHg)(p<0.05)groups compared with the Cont group(93±4.0mmHg). However, ⊿MAP, ⊿HR, Min-SpO2, and ⊿SpO2 were not significantly different among the four groups. Our results suggest that non-invasive continuous monitoring facilitates evaluation of stress responses to breath-holding in preoperative patients, and that the breath-holding stress test causes sympathetic augmentation, resulting in increases in MAP and HR by approximately 15%, concomitant with a decrease in SpO2 to 90-94%. The magnitude of the response is similar regardless of age and existence of HT and DM. |
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| Practice | Basic medicine |
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| Keywords | Breath-holding, stress test, homodynamlc, preoperatlve, tonometry |
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