Can dead space fraction predict the length of mechanical ventilation in exacerbated COPD patients?

Figures & data

Table 1 Summary of all results

	Values	Results
Gender	Male	52 (71.4%)
	Female	29 (28.6%)
Age (Year)	Mean (Std)	70.6
pH	Mean (Std)	7.15 ± 0.08
PaO2 mmHg	Mean (Std)	91.47 ± 60.25
PaCO2 mmHg	Mean (Std)	90 ± 16
Bicarbonate mEq/l	Mean (Std)	30.8 ± 6.68
O2– Saturation %	Mean (Std)	86.2 ± 10.9
PeCO2 mmHg	Mean (Std)	45.0 ± 11.29
Respiratory rate	Mean (Std)	18.18 ± 7.9
DSF	Mean (Std)	0.49 ± 0.12
Duration of MV (Hours)	Mean (Std)	47.39 ± 40.07

Notes: This table shows the mean of 73 patients’ parameters on admission to intensive care unit (all of them on MV) and the duration of MV in hours.

Abbreviations: DSF, dead space fraction; MV, mechanical ventilation; O₂, oxygen saturation in arterial blood; PaO₂, partial pressure of oxygen in arterial blood. PaCO₂, partial pressure of carbon dioxide in arterial blood.

Table 2 The correlations between parameters

			pH	PaCO2	DSF	Hours
Spearman’s rho	pH	R	1.000	−0.405**	−0.387**	0.205
		P (1-tailed)	–	0.002	0.003	0.079
		N	73	73	73	73
	PaCO2	R	−0.405**	1.000	0.367**	0.110
		P (1-tailed)	0.002	–	0.005	0.226
		N	73	73	73	73
	DSF	R	−0.387**	0.367**	1.000	−0.024
		P (1-tailed)	0.003	0.005	–	0.434
		N	73	73	73	73
	Hours	R	0.205	0.110	−0.024	1.000
		P (1-tailed)	0.079	0.226	0.434	–
		N	73	73	73	73

Notes:

* Spearman correlation coefficient test.

** Correlation is significant at the 0.01 level(one-tailed). There is correlation between DSF and PaCO₂ and ph but there is no correlation between DSF and duration of MV in COPD patients.

Abbreviations: COPD, chronic obstructive pulmonary disease; DSF, dead space fraction; MV, mechanical ventilation; PaCO₂, partial pressure of carbon dioxide in arterial blood.