Table 2.

Mean Systolic Velocities, Pulsatility Indices, and HITs by Device

Waveform Parameters	n	MFV cm/second of MCA	P Value	MCA PI	P Value	Mean HITS/minute	P Value
Preimplantation baseline	20	50.86 (12.31)	.9	1.05 (.56)	.5	.01 (.05)	.3
VA-ECMO	27	56.07 (21)	.7	.43 (.25)	<.01**	2.81 (.09)	.04*
HVAD	21	48.94 (15.93)	.2	.35 (.17)	<.01**	.00 (.01)	.3
HMII	5	57.30 (12.9)	.8	.32 (.13)	<.01**	.02 (.06)	.4
Tandem heart	3	33.25 (9.36)	.03*	.38 (.025)	<.01*	1.07 (1.51)	.5
TAH	25	79.69 (32.33)	.2	.74 (.14)	.5	12.55(12.04)	.02*
Impella	13	53.72 (11.74)	.2	.65 (.24)	.07	8 (27)	.02*
IABP	7	59.79 (11.54)	.7	1.01 (.16)	.7	.01 (.03)	.4
HT	10	56.11 (16.39)		1.12 (.52)		0(0)

Note: Numbers are reported as mean (standard deviation) unless otherwise specified. P value is obtained from comparisons to HT studies.

^*P < .05

^**P < .01.

FiO2 = fraction inspired oxygen; HITS/min = high-intensity transient signal observed per minute; HMII = Heartmate II; HT = heart transplantation; HVAD = HeartWare ventricular assist device; IABP = intra-arterial balloon pump; MCA = middle cerebral artery; MFV = mean flow velocity; n = number of transcranial Doppler studies for each device; PI = pulsatility index; TAH, total artificial heart; VA-ECMO = venoarterial-extracorporeal membrane oxygenation.