Tomonobu Sato1, Tomonori Takazawa2, Masahiro Inoue1, Yasunori Tada1, Takashi Suto1, Masaru Tobe1, Shigeru Saito1. 1. Department of Anesthesiology, Gunma University Graduate School of Medicine, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan; The Advanced Engineering Research Team, Advanced Scientific Research Leaders Development Unit, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan. 2. Department of Anesthesiology, Gunma University Graduate School of Medicine, 3-39-22, Showa-machi, Maebashi, Gunma 371-8511, Japan; The Advanced Engineering Research Team, Advanced Scientific Research Leaders Development Unit, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan. Electronic address: takazawt@gunma-u.ac.jp.
Abstract
OBJECTIVE: We had previously experienced a case involving prolonged cardiopulmonary resuscitation (CPR) on Mt. Fuji (3776 m), demanding strenuous work by the rescuers. The objective of this study was to compare the effect of compression-only and conventional CPR on oxygen saturation of rescuers in a hypoxemic environment. METHODS: Changes in percutaneous arterial oxygen saturation (SpO2) and heart rate during CPR action were measured in a hypobaric chamber with barometric pressure adjusted to be equivalent to 3700 m above sea level (630-640 hPa). Thirty-three volunteers performed CPR with or without breaths using a CPR mannequin. RESULTS: In a 3700-m-equivalent environment, SpO2 was reduced only when CPR was performed without breaths (P < .05, one-way analysis of variance (ANOVA) post hoc Tukey test). Heart rate increased during CPR regardless of the presence or absence of breaths. Mean scores on the Borg scale, a subjective measure of fatigue, after CPR action in the 3700-m-equivalent environment were significantly higher (15 ± 2) than scores after CPR performed at sea level (11 ± 2, P < .01, paired t-test). No lethal dysrhythmia was found in subjects with a wearable electrode shirt. CONCLUSIONS: Prolonged CPR at high altitude exerts a significant physical effect upon the condition of rescuers. Compression-only CPR at high altitude may deteriorate rescuer oxygenation, whereas CPR with breaths might ameliorate such deterioration.
OBJECTIVE: We had previously experienced a case involving prolonged cardiopulmonary resuscitation (CPR) on Mt. Fuji (3776 m), demanding strenuous work by the rescuers. The objective of this study was to compare the effect of compression-only and conventional CPR on oxygen saturation of rescuers in a hypoxemic environment. METHODS: Changes in percutaneous arterial oxygen saturation (SpO2) and heart rate during CPR action were measured in a hypobaric chamber with barometric pressure adjusted to be equivalent to 3700 m above sea level (630-640 hPa). Thirty-three volunteers performed CPR with or without breaths using a CPR mannequin. RESULTS: In a 3700-m-equivalent environment, SpO2 was reduced only when CPR was performed without breaths (P < .05, one-way analysis of variance (ANOVA) post hoc Tukey test). Heart rate increased during CPR regardless of the presence or absence of breaths. Mean scores on the Borg scale, a subjective measure of fatigue, after CPR action in the 3700-m-equivalent environment were significantly higher (15 ± 2) than scores after CPR performed at sea level (11 ± 2, P < .01, paired t-test). No lethal dysrhythmia was found in subjects with a wearable electrode shirt. CONCLUSIONS: Prolonged CPR at high altitude exerts a significant physical effect upon the condition of rescuers. Compression-only CPR at high altitude may deteriorate rescuer oxygenation, whereas CPR with breaths might ameliorate such deterioration.
Authors: Anna Vögele; Michiel Jan van Veelen; Tomas Dal Cappello; Marika Falla; Giada Nicoletto; Alexander Dejaco; Martin Palma; Katharina Hüfner; Hermann Brugger; Giacomo Strapazzon Journal: J Am Heart Assoc Date: 2021-12-02 Impact factor: 5.501
Authors: José Luis Martin-Conty; Begoña Polonio-López; Clara Maestre-Miquel; Alicia Mohedano-Moriano; Carlos Durantez-Fernández; Laura Mordillo-Mateos; Jesús Jurado-Palomo; Antonio Viñuela; Juan José Bernal-Jiménez; Francisco Martin-Rodríguez Journal: Int J Environ Res Public Health Date: 2020-08-12 Impact factor: 3.390