Influence of nocturnal hypoxemia on follow-up course after type B acute aortic syndrome

BMC Pulmonary Medicine

Table 3 Associations of nocturnal hypoxemia parameters with aortic diameters in overall study patients

Aortic diameters	Ventilatory parameters	Unadjusted			Adjusted*
Aortic diameters	Ventilatory parameters	β (SD)	R²	p value	β (SD)	R^2†	p value
False lumen TD aorta	ODI^a	0.209 (1.236)	0.001	0.87	− 0.479 (1.394)	0.039	0.73
	AHI^b	1.058 (1.002)	0.011	0.29	0.807 (1.079)	0.046	0.45
	Lowest nocturnal oxygen saturation	− 0.233 (0.165)	0.022	0.16	− 0.176 (0.188)	0.047	0.35
	Mean nocturnal oxygen saturation	− 0.521 (0.481)	0.012	0.28	− 0.378 (0.549)	0.045	0.49
	Percentage of nocturnal time under a saturation of 90%^a	1.069 (0.781)	0.02	0.17	0.928 (0.921)	0.049	0.32
TD diameter of the aorta	ODI^a	0.601 (1.001)	0.004	0.55	0.941 (1.077)	0.129	0.39
	AHI^b	1.558 (0.800)	0.037	0.054	1.751 (0.820)	0.159	0.035
	Lowest nocturnal oxygen saturation	− 0.033 (0.135)	0.001	0.81	− 0.001 (0.146)	0.123	0.99
	Mean nocturnal oxygen saturation	− 0.224 (0.391)	0.003	0.57	− 0.392 (0.424)	0.133	0.36
	Percentage of nocturnal time under a saturation of 90%^a	0.593 (0.635)	0.009	0.35	0.682 (0.711)	0.135	0.34
Ascending aorta diameter	ODI^a	1.102 (0.591)	0.039	0.066	0.559 (0.581)	0.294	0.34
	AHI^b	1.002 (0.491)	0.042	0.044	0.472 (0.449)	0.332	0.3
	Lowest nocturnal oxygen saturation	− 0.052 (0.078)	0.005	0.51	0.042 (0.076)	0.295	0.58
	Mean nocturnal oxygen saturation	− 0.443 (0.230)	0.038	0.057	− 0.133 (0.228)	0.313	0.56
	Percentage of nocturnal time under a saturation of 90%^a	1.217 (0.361)	0.11	0.001	0.570 (0.377)	0.328	0.13

The results were highlighted (bold) when the p value was inferior or equal to 0.05
TD, thoracic descending; ODI, oxygen desaturation index; AHI, apnea–hypopnea index
^aAfter logarithm + 1 transformation
^bAfter logarithm transformation
*Adjusted for age, BMI, sex, diabetes and systolic blood pressure
^†Partial R squared values calculated in multiple linear regression models

ISSN: 1471-2466