BACKGROUND: If a cardiac arrest occurs in microgravity, current emergency protocols aim to treat patients via a medical restraint system within 2-4 min. It is vital that crewmembers have the ability to perform single-person cardiopulmonary resuscitation (CPR) during this period, allowing time for advanced life support to be deployed. The efficacy of the Evetts-Russomano (ER) method has been tested in 22 s of microgravity in a parabolic flight and has shown that external chest compressions (ECC) and mouth-to-mouth ventilation are possible. METHODS: There were 21 male subjects who performed both the ER method in simulated microgravity via full body suspension and at +1 Gz. The CPR mannequin was modified to provide accurate readings for ECC depth and a metronome to set the rate at 100 bpm. Heart rate, rate of perceived exertion, and angle of arm flexion were measured with an ECG, elbow electrogoniometers, and Borg scale, respectively. RESULTS: The mean (+/- SD) depth of ECC in simulated microgravity was lower in each of the 3 min compared to +1 G2. The ECC depth (45.7 +/- 2.7 mm, 42.3 +/- 5.5 mm, and 41.4 +/- 5.9 mm) and rate (104.5 +/- 5.2, 105.2 +/- 4.5, and 102.4 +/- 6.6 compressions/min), however, remained within CPR guidelines during simulated microgravity over the 3-min period. Heart rate, perceived exertion, and elbow flexion of both arms increased using the ER method. CONCLUSION: The ER method can provide adequate depth and rate of ECC in simulated microgravity for 3 min to allow time to deploy a medical restraint system. There is, however, a physiological cost associated with it and a need to use the flexion of the arms to compensate for the lack of weight.
BACKGROUND: If a cardiac arrest occurs in microgravity, current emergency protocols aim to treat patients via a medical restraint system within 2-4 min. It is vital that crewmembers have the ability to perform single-person cardiopulmonary resuscitation (CPR) during this period, allowing time for advanced life support to be deployed. The efficacy of the Evetts-Russomano (ER) method has been tested in 22 s of microgravity in a parabolic flight and has shown that external chest compressions (ECC) and mouth-to-mouth ventilation are possible. METHODS: There were 21 male subjects who performed both the ER method in simulated microgravity via full body suspension and at +1 Gz. The CPR mannequin was modified to provide accurate readings for ECC depth and a metronome to set the rate at 100 bpm. Heart rate, rate of perceived exertion, and angle of arm flexion were measured with an ECG, elbow electrogoniometers, and Borg scale, respectively. RESULTS: The mean (+/- SD) depth of ECC in simulated microgravity was lower in each of the 3 min compared to +1 G2. The ECC depth (45.7 +/- 2.7 mm, 42.3 +/- 5.5 mm, and 41.4 +/- 5.9 mm) and rate (104.5 +/- 5.2, 105.2 +/- 4.5, and 102.4 +/- 6.6 compressions/min), however, remained within CPR guidelines during simulated microgravity over the 3-min period. Heart rate, perceived exertion, and elbow flexion of both arms increased using the ER method. CONCLUSION: The ER method can provide adequate depth and rate of ECC in simulated microgravity for 3 min to allow time to deploy a medical restraint system. There is, however, a physiological cost associated with it and a need to use the flexion of the arms to compensate for the lack of weight.
Authors: William S Phipps; Zhizhong Yin; Candice Bae; Julia Z Sharpe; Andrew M Bishara; Emily S Nelson; Aaron S Weaver; Daniel Brown; Terri L McKay; DeVon Griffin; Eugene Y Chan Journal: J Vis Exp Date: 2014-11-13 Impact factor: 1.355
Authors: Jochen Hinkelbein; Steffen Kerkhoff; Christoph Adler; Anton Ahlbäck; Stefan Braunecker; Daniel Burgard; Fabrizio Cirillo; Edoardo De Robertis; Eckard Glaser; Theresa K Haidl; Pete Hodkinson; Ivan Zefiro Iovino; Stefanie Jansen; Kolaparambil Varghese Lydia Johnson; Saskia Jünger; Matthieu Komorowski; Marion Leary; Christina Mackaill; Alexander Nagrebetsky; Christopher Neuhaus; Lucas Rehnberg; Giovanni Marco Romano; Thais Russomano; Jan Schmitz; Oliver Spelten; Clément Starck; Seamus Thierry; Rochelle Velho; Tobias Warnecke Journal: Scand J Trauma Resusc Emerg Med Date: 2020-11-02 Impact factor: 2.953
Authors: Thais Russomano; Justin H Baers; Rochelle Velho; Ricardo B Cardoso; Alexandra Ashcroft; Lucas Rehnberg; Rodrigo D Gehrke; Mariana K P Dias; Rafael R Baptista Journal: Extrem Physiol Med Date: 2013-04-01