Is It Possible to Maintain Consciousness and Spontaneous Ventilation with Chest Compression in the Early Phase of Cardiac Arrest?

Table 1

Perioperative arterial blood gas, peak end-tidal partial CO₂ pressure, and concomitant hemodynamic parameter measurements (bold column, time of VF initiation; italic columns, cardiac arrest period).

Measurement number	T1	T2	T3	T4	T5	T6	T7	T8	T9	T10
pH	7.45	7.36	7.01	No result	7.19	7.26	7.05	7.12	7.39	7.40
PaCO2 (mmHg)	40	43	39	No result	47	61	78	56	34	68
ETCO2 (mmHg)	25	25	Not monitored ETCO2	Not monitored ETCO2	19	19	21	22	Not monitored	Not monitored
Base excess	3.5	−1.2	−21	No result	−9.9	−0.2	−9.3	−10.7	−3.7	−3.1
PaO2 (mmHg)			126	No result				92	93	68
Lactate (mMol/L)	2.0	3.5	7.5	7.5	8.0	8.0	8.5	11.7	6.0	3.5
Glucose (mg/dL)	126	220	205					256
Potassium (mMol/L)	3.5	3.6	2.0	2.2	2.8	3.0	3.2	4.0	3.6	3.2
FiO2 (%)	50	50	Room air	100	100	100	100	100	100	Room air
Cardiac rhythm	Sinus	Sinus	VF	Asystole	Asystole	Asystole	Asystole	Bradycardia	Sinus	Sinus
HR (beat/minute)	67	70	Not applicable	0	100	100	100	51	80	88
MAP (mmHg)	60	60	No pressure	No pressure	60	65	65	60	68	85
SpO2 (%)	99	99	Unreadable	Unreadable	Unreadable	Unreadable	Unreadable	Unreadable	97	95

CPR, cardiopulmonary resuscitation; ETCO₂, peak end-tidal partial pressure of CO₂; FiO₂, fractional inspired O₂ concentration; HR, heart rate; MAP, mean arterial pressure; PaCO₂, arterial partial pressure of CO₂; PaO₂, arterial partial pressure of O₂; SpO₂, O₂ saturation; VF, ventricular fibrillation.
T1, baseline; T2, intraoperative period; T3, postoperative VF and defibrillation; T4, after 2 min of CPR after defibrillation attempts; T5, resuscitation 1; T6, resuscitation 2; T7, resuscitation 3; T8, resuscitation 4; T9, postoperative day 1; T10, after tracheal extubation on postoperative day 1.