Cardiac rehabilitation in a heart failure patient after left ventricular assist device insertion and subsequent heart transplantation: A case report

Table 1 Results of serial cardiopulmonary exercise tests

	Post-LVAD1, 81 d (August 8, 2019)	Post-LVAD, 207 d (December 12, 2019)	Post-HT1, 116 d (April 13, 2020)	Post-HT, 162 d (May 29, 2020)
Protocol	Modified Bruce	Modified Bruce	Modified Bruce	Modified Bruce
Duration	7 min 44 s	12 min 23 s	9 min 55 s	14 min 06 s
VO2 peak, mL/min/kg (% of the predicted)	18.01 (47%)	20.20 (57%)	17.24 (47%)	22.29 (62%)
VO2 at AT, mL/min/kg	15.81	15.97	13.03	16.78
METs	5.2	5.7	5.0	6.4
Resting HR, bpm	100	85	86	88
Maximum HR, bpm (% of the predicted)	140 (83%)	159 (95%)	107 (64%)	129 (77%)
HRR after 1 min	-4	-14	+2	+5
Resting BP, mmHg	NM	NM	115/88	119/86
Maximum BP, mmHg	NM	NM	130/67	147/88
VE/VCO2 slope	29.7	30.6	34.0	31.6
RER	1.02	0.98	1.01	1.11

¹LVAD was conducted on May 20, 2019, and HT was conducted on December 20, 2019.

LVAD: Left ventricular assist device; HT: Heart transplantation; VO_{2 peak}: Peak oxygen consumption; VO₂ at AT: Oxygen uptake at the anaerobic threshold; MET: Metabolic equivalent task; HR: Heart rate; HRR-1 min: Heart rate recovery in one minute; BP: Blood pressure; V_E: Minute ventilation; V_CO2: The volume of exhaled carbon dioxide; RER: Respiratory exchange ratio; NM: Not measurable.