Determination of the theoretical personalized optimum chest compression point using anteroposterior chest radiography
- Author:
Shinwoo KIM
1
;
Sung Bin CHON
;
Won Sup OH
;
Sunho CHO
Author Information
- Publication Type:Original Article
- Keywords: Cardiopulmonary resuscitation; Heart arrest; Intensive care units; Radiography, thoracic; Tomography, X-ray computed
- MeSH: Adult; Cardiopulmonary Resuscitation; Critical Illness; Cross-Sectional Studies; Heart Arrest; Heart Ventricles; Humans; Intensive Care Units; Joints; Linear Models; Radiography; Radiography, Thoracic; Retrospective Studies; Stroke Volume; Thorax; Tomography, X-Ray Computed
- From: Clinical and Experimental Emergency Medicine 2019;6(4):303-313
- CountryRepublic of Korea
- Language:English
- Abstract: OBJECTIVE: There is a traditional assumption that to maximize stroke volume, the point beneath which the left ventricle (LV) is at its maximum diameter (P_max.LV) should be compressed. Thus, we aimed to derive and validate rules to estimate P_max.LV using anteroposterior chest radiography (chest_AP), which is performed for critically ill patients urgently needing determination of their personalized P_max.LV.METHODS: A retrospective, cross-sectional study was performed with non-cardiac arrest adults who underwent chest_AP within 1 hour of computed tomography (derivation:validation=3:2). On chest_AP, we defined cardiac diameter (CD), distance from right cardiac border to midline (RB), and cardiac height (CH) from the carina to the uppermost point of left hemi-diaphragm. Setting point zero (0, 0) at the midpoint of the xiphisternal joint and designating leftward and upward directions as positive on x- and y-axes, we located P_max.LV (x_max.LV, y_max.LV). The coefficients of the following mathematically inferred rules were sought: x_max.LV=α₀*CD-RB; y_max.LV=β₀*CH+γ₀ (α₀: mean of [x_max.LV+RB]/CD; β₀, γ₀: representative coefficient and constant of linear regression model, respectively).RESULTS: Among 360 cases (52.0±18.3 years, 102 females), we derived: x_max.LV=0.643*CD-RB and y_max.LV=55-0.390*CH. This estimated P_max.LV (19±11 mm) was as close as the averaged P_max.LV (19±11 mm, P=0.13) and closer than the three equidistant points representing the current guidelines (67±13, 56±10, and 77±17 mm; all P<0.001) to the reference identified on computed tomography. Thus, our findings were validated.CONCLUSION: Personalized P_max.LV can be estimated using chest_AP. Further studies with actual cardiac arrest victims are needed to verify the safety and effectiveness of the rule.
