Table 2.

Operative and volume characteristics by cardioplegia type.

	4:1	MP	DN	HTK	p-Value
Observations	8,350	4,606	3,344	370
Net prime volume (mL)—median [IQR]	760 [625, 900]	660 [510, 820]	655 [500, 900]	675 [525, 875]	<.001
CPB added crystalloid (mL)—median [IQR]	283 [82, 700]	314 [105, 700]	225 [60, 550]	915 [343, 1,260]	<.001
Urine output on CPB (mL)—median [IQR]	250 [130, 400]	200 [125, 350]	200 [110, 350]	230 [135, 350]	<.001
Ultrafiltration used—n (%)	2,842 (34.0)	1,895 (41.1)	2,799 (83.7)	314 (84.9)	<.001
Ultrafiltration volume when used (mL)—median [IQR]	1,500 [1,000, 2,300]	1,200 [700, 1,800]	2,000 [1,300, 3,000]	2,900 [2,205, 3,600]	<.001
Anesthesia crystalloid volume (mL)—median [IQR]	1,500 [1,100, 2,000]	1,500 [1,000, 1,900]	1,000 [1,000, 1,550]	1,300 [1,000, 1,700]	<.001
CPB time (minutes)—median [IQR]	100 [77, 133]	103 [77, 138]	91 [69, 122]	104 [81, 132]	<.001
Cross clamp time (minutes)—median [IQR]	73 [55, 98]	77 [54, 105]	66 [48, 90]	82 [64, 100]	<.001

CPB, cardiopulmonary bypass; DN, del Nido; HTK, histidine-tryptophan-ketoglutarate; IQR, interquartile range; MP, microplegia; 4:1, 4–1 blood to crystalloid.