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Chinese Journal of Hygiene Rescue(Electronic Edition) ›› 2017, Vol. 03 ›› Issue (02): 92-97. doi: 10.3877/cma.j.issn.2095-9133.2017.02.006

Special Issue:

• Original Article • Previous Articles     Next Articles

Inhalation of hydrogen improves myocardial function and survival outcomes in a porcine model of prolonged cardiac arrest

Cai Wen1, Tao Yu1, Xiaozhu Zhai1, Zhengfei Yang1, Longyuan Jiang1,(), Wanchun Tang1   

  1. 1. Department of Emergency, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China
  • Received:2017-03-15 Online:2017-04-18 Published:2017-04-18
  • Contact: Longyuan Jiang
  • About author:
    Corresponding author: Jiang Longyuan, Email:

Abstract:

Objective

To investigate the beneficial effect of hydrogen(H2)on myocardial dysfunction after cardiopulmonary resuscitation (CPR) in a pig model with a prolonged cardiac arrest.

Methods

Healthy domestic pigs were subjected to 10 minutes of ventricular fibrillation cardiac arrest induced electrically and followed by CPR. After achieving the return of spontaneous circulation (ROSC), the post-cardiac arrest pigs were randomized into two groups: mechanically ventilated with room air (control group); mechanically ventilated with 2% H2(H2∶O2∶N2=2%∶21%∶77%)for 2 hours after ROSC and turned to ventilate with room air (H2 group). Hemodynamic parameters including HR, MAP, left ventricular pressure derivative (±dp/dtmax) and cardiac index (CI) were recorded for 6 hours continually after successful resuscitation. Arterial blood gas, lactate and serum marker of myocardial injury (cTnT and NT-pro-BNP) were measured at baseline, and at 0.5, 2, 4 and 6 hours after CPR. The survival outcomes of animals were evaluated and recorded until 96 hours after CPR.

Results

Worse post-resuscitation myocardial function was found in both groups compared to the status prior to CA, but the myocardial function of the H2 group was superior to that of the control group. The indicators of myocardial function in the H2 group especially at 5 hours and 6 hours after CPR [+ dp/dtmax: (3320.1±433.4)mmHg/s and (3294.5±390.4)mmHg/s; -dp/dtmax: (3756.1±498.8)mmHg/s and (3667.4±406.8)mmHg/s; CI: (6.8±1.0) L/min·m2 and(6.7±1.2)L/min·m2] were much better than those of the control group at the same time points [+ dp/dtmax: (2863.5±340.8)mmHg/s and(2925.2±251.3) mmHg/s; -dp/dtmax: (3245.4±259.6)mmHg/s and (3261.9±311)mmHg/s; CI: (5.3±1.5)L/min·m2 and(5.1±1.4)L/min·m2](all P<0.05). At 4 hours and 6 hours after CPR, the serum levels of cTnT and NT-pro-BNP in H2 group [cTnT: (2.7±0.9)ng/mL and (2.7±0.8)ng/mL; NT-pro-BNP: (0.34±0.13)ng/mL and(0.37±0.17)ng/mL] were obviously lower compared to the control group [cTnT: (4.9±1.2)ng/mL and (5.8±1.2)ng/mL; NT-pro-BNP: (0.54±0.12)ng/mL and(0.78±0.21)ng/mL](all P<0.05). In addition, greater survival duration was also observed in H2 group compared to the control group [96(25, 96)hours vs. 16(12, 22)hours, P<0.05].

Conclusion

Inhalation of H2 improves post-resuscitation myocardial dysfunction and survival outcomes in a porcine model with prolonged cardiac arrest.

Key words: Cardiac arrest, Cardiopulmonary resuscitation, Myocardial dysfunction, Hydrogen

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