Abstract P156: Elderly Laypersons Can Perform Ten Minutes of Cardiopulmonary Resuscitation on Manikins with Human-like Chest Properties
Introduction: Many cardiac arrest witnesses are elderly, who previous studies indicate have difficulties performing CPR. We studied elderly laypersons randomized to perform ten minutes of either continuous chest compression CPR (CCC) or standard 30 compressions 2 ventilations CPR (30:2), and we studied if verbal and visual feedback could prevent fatigue.
Materials and methods: Participants were recruited 5–7 months after classes and randomized to perform either standard 30:2 or CCC with (FB) or without (nFB) feedback in a factorial design. CPR quality was recorded from a manikin with human-like chest properties (Laerdal Medical, Stavanger, Norway). Correlation between age and compression depth and rate were analyzed using bivariate regression. Fatigue was assessed using repeated measures ANOVA. Compression depth (c.depth) and rate (c.rate) are reported as mean±SD, ventilation variables as median with 25–75-percentiles.
Results: Sixty-four persons aged 50 to 76 (median 63) were included. The groups were similar with regards to age, gender, height and weight. All were able to perform ten minutes of CPR. Overall c.depth and c.rate was 46±4 mm and 94±20, respectively. C.depth or c.rate did not differ for CCC vs. 30:2 (mean difference (95 % confidence interval) 2 (−1, 4) p=0.13 and 5 (−5, 15) p=0.35), and age had no effect (R=0.16, p=0.90 and R=0.13, p=0.31). Mean c.depth was within guideline limits for ten minutes with a slight decrease with time from 48 mm to 45 mm, mean change 3.7 (2.8, 4.6), p<0.0005, steeper the first five than the last five minutes. Similar pattern was found with and without feedback. C.rate increased from 92±18 the first minute to 103±8 in the tenth minute (p=0.006) with feedback. C.rate did not change with time for nFB and mean was lower than with feedback, 86±26 vs. 101±6, p=0.002. The FB group delivered 4 (4, 5) ventilations per minute, while the nFB group delivered 2 (0, 4), p=0.026. Six of 32 study subjects in the 30:2 group were unable to deliver any ventilations, all were in the nFB group.
Conclusions: Laypersons aged 50 + can do 10 minutes of CPR with satisfactory quality. Age does not influence chest compression depth or rate. Compression depth decreased (fatigue) most the first five minutes, but remained well within guideline recommendations.