In vivo acute performance of the Cleveland Clinic self-regulating, continuous-flow total artificial heart.
BACKGROUND
The purpose of this study was to evaluate the acute in vivo pump performance of a unique valveless, sensorless, pulsatile, continuous-flow total artificial heart (CFTAH) that passively self-balances left and right circulations without electronic intervention.


METHODS
The CFTAH was implanted in two calves, with pump and hemodynamic data recorded at baseline over the full range of pump operational speeds (2,000 to 3,000 rpm) in 200-rpm increments, with pulsatility variance, and under a series of induced hemodynamic states created by varying circulating blood volume and systemic and pulmonary vascular resistance (SVR and PVR).


RESULTS
Sixty of the 63 induced hemodynamic states in Case 1 and 73 of 78 states in Case 2 met our design goal of a balanced flow and maximum atrial pressure difference of 10 mm Hg. The correlation of calculated vs measured flow and SVR was high (R(2) = 0.857 and 0.832, respectively), allowing validation of an additional level of automatic active control. By varying the amplitude of sinusoidal modulation of the speed waveform, 9 mm Hg of induced pulmonary and 18 mm Hg of systemic arterial pressure pulsation were achieved.


CONCLUSIONS
These results validated CFTAH self-balancing of left and right circulation, induced arterial flow and pressure pulsatility, accurate calculated flow and SVR parameters, and the performance of an automatic active control mode in an acute, in vivo setting in response to a wide range of imposed physiologic perturbations.
Fumoto
Hideyuki
H
Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.
Horvath
David J
DJ
Rao
Santosh
S
Massiello
Alex L
AL
Horai
Tetsuya
T
Takaseya
Tohru
T
Arakawa
Yoko
Y
Mielke
Nicole
N
Chen
Ji-Feng
JF
Dessoffy
Raymond
R
Fukamachi
Kiyotaka
K
Golding
Leonard A R
LA
D000465:Algorithms; D000818:Animals; D001243:Assisted Circulation / Q000295:instrumentation*; D001775:Blood Circulation / Q000502:physiology*; D002417:Cattle; D006354:Heart, Artificial / Q000592:standards*; D006353:Heart-Assist Devices / Q000592:standards*; D006439:Hemodynamics / Q000502:physiology; D008297:Male; D023421:Models, Animal; D011673:Pulsatile Flow / Q000502:physiology; D014655:Vascular Resistance / Q000502:physiology