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Mismatch between left ventricle location and standard cardiopulmonary resuscitation hand placement: A transthoracic
Morgan Dalm1, Monica Mikhael1, Matthew Drogowski2
1Department of Emergency Medicine, Corewell Health William Beaumont University Hospital, Royal Oak, MI, United States.
Insights
The distance between the sternum and left ventricle (LV) varies, impacting CPR effectiveness. Males, obese individuals, and those with multiple comorbidities have a greater sternum-to-LV distance, suggesting current CPR guidelines may need adjustment.
Area of Science:
- Cardiology
- Emergency Medicine
- Anatomy
Background:
- Cardiopulmonary resuscitation (CPR) quality is vital for patient outcomes.
- Current CPR guidelines recommend sternum-based compressions, but the left ventricle's (LV) precise location relative to the sternum is not well-defined.
- Anatomical variations may influence the effectiveness of standard CPR techniques.
Purpose of the Study:
- To measure the distance between the sternum and the LV using transthoracic ultrasound (TTE).
- To identify clinical and demographic factors associated with variations in sternum-to-LV distance.
Main Methods:
- A retrospective observational study involving adult patients undergoing TTE for non-arrest indications.
- Measurement of the distance from the lower third of the sternum to the center of the LV as the primary outcome.
- Multivariate linear regression analysis to identify associated factors.
Main Results:
- The mean sternum-to-LV distance was 4.85 cm (±1.44 cm) in 110 patients.
- Male sex, obesity, and having five or more comorbidities were independently associated with a greater sternum-to-LV distance.
- These factors significantly influenced the anatomical relationship between the sternum and LV.
Conclusions:
- A significant anatomical distance exists between the standard sternum landmark for CPR and the LV.
- This distance is notably larger in males, obese patients, and those with multiple comorbidities.
- Findings suggest that anatomical variability may compromise CPR efficacy and challenge the universal applicability of current guidelines; TTE may aid in identifying optimal compression sites.
Background:
High-quality chest compressions are central to effective CPR and are traditionally performed over the lower third of the sternum [1]. Emerging evidence suggests that targeting the left ventricle (LV) directly may enhance hemodynamics and outcomes [2]. The LV may not lie directly beneath the sternum, and limited data exist to define this positional relationship. The study aimed to quantify the distance from the sternum-to-LV using transthoracic ultrasound (TTE) and to evaluate clinical and demographic factors associated with increased distance.
Methods:
This retrospective observational study was conducted in the emergency department of a suburban academic tertiary center. Adult patients who underwent TTE for non-arrest indications were included. The primary outcome was the distance from the lower third of the sternum to the center of the LV.
Results:
From March-May 2025, 110 patients were included. The mean sternum-to-LV distance was 4.85 cm (SD ± 1.44). Multivariate linear regression showed male sex (β = 0.56, p = 0.004), obesity (β = 0.71, p = 0.047), and having five or more comorbidities (β = 1.20, p = 0.007) were independently associated with greater distance.
Discussion:
This study identified a substantial distance between standard CPR hand placement and LV location, especially in males, obese patients, and those with multiple comorbidities. These findings suggest that anatomical variation may affect CPR efficacy and call into question the universality of current guidelines.
Conclusion:
Transthoracic echocardiography (TTE) may help identify optimal compression sites, and further research is needed to validate this approach and evaluate its clinical impact.
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