Intraoperative burst suppression is associated with postoperative delirium following cardiac surgery: a prospective, observational study

Table 2 Comorbidity and plasma electrolyte concentrations in comparison between delirious and non-delirious patients

		Patients with delirium (n = 26)	Patients without delirium (n = 55)	p-value
Comorbidity
Congestive heart failure		9	24	0.48
Myocardial infarction		6	18	0.44
Diabetes mellitus		7	15	1.00
COPD		5	8	0.75
Peripheral vascular disease		2	5	1.00
Cerebrovascular disease		3	4	0.20
Preoperative plasma electrolyte concentrations
Sodium	[mmol/l]	140 [137.8;142.3]	140 [139;141]	0.83
Potassium	[mmol/l]	3.7 [3.6; 4.1]	3.8 [3.5;4.1]	0.96

The number of patients with certain comorbities is shown in the upper part. COPD = chronic obstructive pulmonary disease. Electrolyte concentrations are expressed as medians and interquartile range. Groups did not differ significantly with respect to the above shown parameters.

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