It is unlikely that oxygen supplementation in COPD patients with chronic respiratory failure reduce cardiac troponin level

Table 3 Geometric means of high-sensitivity of cardiac troponin T (hs-cTnT) in patients that started long-term oxygen supplementation (LTOT: yes), compared to matched short-term and long-term reference groups (LTOT: no)

Time frame	Both groups: ng/L gm (gsd)	LTOT: yes, ng/L gm (gsd)	LTOT: no, ng/L gm (gsd)	LTOT: yes/no^a Ratio (SE), p-value
Long-term	N = 26	n = 18	n = 8
I: Inclusion	15.5 (2.6)	16.5 (2.7)	14.0 (2.4)
F: Follow-up	16.8 (2.3)	18.4 (2.4)	15.2 (2.3)
Ratio F/I, p-value	1.08, 0.126	1.08, 0.346	1.09, 0.226
				0.99 (1.11), 0.903
Short-term	N = 32	n = 20	n = 12
T1: 08–09 a.m.	18.1 (3.5)	17.8 (2.3)	18.4 (4.8)
T3: 13–15 p.m.	15.9 (3.8)	15.4 (2.5)	16.4 (5.4)
Ratio T3/T1, p-value	0.88, < 0.001	0.87, 0.005	0.89, 0.103
				0.97 (1.08), 0.741

^aThe ratio between the baseline (cTnT₀) to follow-up (cTnT₁) change in hs-cTnT in the Index group to that of the reference groups, given by: ((cTnT₁)/( cTnT_o))_{Index group}/((cTnT₁)/( cTnT_o))_References Gm: Geometric mean, gsd: geometric standard deviation, SE: standard error

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