Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg.
The possibility of nocturnal oxygen desaturation (NOD) in patients with chronic bronchitis and emphysema (CBE) even with basal hypoxemia greater that 55 mmHg is well recognised. Nocturnal hypoventilation is admitted as the main cause for this NOD. In this study we evaluate how the presence of left v...
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| Format: | Article |
| Language: | English |
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Ordem dos Médicos
1997-04-01
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| Series: | Acta Médica Portuguesa |
| Online Access: | https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/2409 |
| _version_ | 1797996291225026560 |
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| author | J M dos Santos A L Marques J Moita R Pato |
| author_facet | J M dos Santos A L Marques J Moita R Pato |
| author_sort | J M dos Santos |
| collection | DOAJ |
| description | The possibility of nocturnal oxygen desaturation (NOD) in patients with chronic bronchitis and emphysema (CBE) even with basal hypoxemia greater that 55 mmHg is well recognised. Nocturnal hypoventilation is admitted as the main cause for this NOD. In this study we evaluate how the presence of left ventricular dysfunction (LVD) could aggravate NOD. Thirty-six patients with CBE and basal stabilised PaO2 55-70 mmHg underwent right heart catheterisation and polysomnographic study. NOD was defined as more than 30% of total sleep time with SaO2 less than 90%; LVD was defined as capillary pressure greater than 15 mmHg. Six patients were excluded from analysis because of sleep apnoea syndrome. In the remaining 30 patients (20 men, 10 women; mean age = 65.88.6 years; mean FEV1 = 0.970.31 litres; 43.316.6% predicted; mean basal PaO2 = 61.83.6 mmHg) 8 had LVD and 18 and NOD. Patients with NOD had a greater diurnal level of hypoventilation (basal PaCO2 = 44.63.8 vs. 414.1 mmHg; p = 0.025). Patients with LVD, despite identical diurnal pulmonary function, showed a significantly p < 0.05) greater degree of NOD (mean nocturnal SaO2 = 84.56.4 vs 89.52.5; minimal nocturnal SaO2= 68.517.3 vs. 79.47.8; Time spent with SaO2 < 90% = 78.833.7 vs. 43.138.7). We conclude that the presence of LVD in patients with CBE and PaO2 55-70 mmHg aggravates the intensity and the time spent with NOD, probably because of aggravation of hypoventilation or ventilation/perfusion mismatching. |
| first_indexed | 2024-04-11T10:13:59Z |
| format | Article |
| id | doaj.art-72d0295f16a543a68a19813a1ffdc952 |
| institution | Directory Open Access Journal |
| issn | 0870-399X 1646-0758 |
| language | English |
| last_indexed | 2024-04-11T10:13:59Z |
| publishDate | 1997-04-01 |
| publisher | Ordem dos Médicos |
| record_format | Article |
| series | Acta Médica Portuguesa |
| spelling | doaj.art-72d0295f16a543a68a19813a1ffdc9522022-12-22T04:30:00ZengOrdem dos MédicosActa Médica Portuguesa0870-399X1646-07581997-04-0110410.20344/amp.2409Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg.J M dos Santos0A L MarquesJ MoitaR PatoServiço de Pneumologia, Centro Hospitalar de Coimbra.The possibility of nocturnal oxygen desaturation (NOD) in patients with chronic bronchitis and emphysema (CBE) even with basal hypoxemia greater that 55 mmHg is well recognised. Nocturnal hypoventilation is admitted as the main cause for this NOD. In this study we evaluate how the presence of left ventricular dysfunction (LVD) could aggravate NOD. Thirty-six patients with CBE and basal stabilised PaO2 55-70 mmHg underwent right heart catheterisation and polysomnographic study. NOD was defined as more than 30% of total sleep time with SaO2 less than 90%; LVD was defined as capillary pressure greater than 15 mmHg. Six patients were excluded from analysis because of sleep apnoea syndrome. In the remaining 30 patients (20 men, 10 women; mean age = 65.88.6 years; mean FEV1 = 0.970.31 litres; 43.316.6% predicted; mean basal PaO2 = 61.83.6 mmHg) 8 had LVD and 18 and NOD. Patients with NOD had a greater diurnal level of hypoventilation (basal PaCO2 = 44.63.8 vs. 414.1 mmHg; p = 0.025). Patients with LVD, despite identical diurnal pulmonary function, showed a significantly p < 0.05) greater degree of NOD (mean nocturnal SaO2 = 84.56.4 vs 89.52.5; minimal nocturnal SaO2= 68.517.3 vs. 79.47.8; Time spent with SaO2 < 90% = 78.833.7 vs. 43.138.7). We conclude that the presence of LVD in patients with CBE and PaO2 55-70 mmHg aggravates the intensity and the time spent with NOD, probably because of aggravation of hypoventilation or ventilation/perfusion mismatching.https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/2409 |
| spellingShingle | J M dos Santos A L Marques J Moita R Pato Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg. Acta Médica Portuguesa |
| title | Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg. |
| title_full | Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg. |
| title_fullStr | Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg. |
| title_full_unstemmed | Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg. |
| title_short | Influência da disfunção ventricular esquerda na dessaturação nocturna em doentes com bronquite crónica enfisema e PaO2 55-70 mmHg. |
| title_sort | influencia da disfuncao ventricular esquerda na dessaturacao nocturna em doentes com bronquite cronica enfisema e pao2 55 70 mmhg |
| url | https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/2409 |
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