Predictors of Positive Subxiphoid Pericardial Window in Stable Patients with Penetrating Injuries to the Precordial Region.

Background: Subxiphoid pericardial window (SPW) remains a valuable diagnostic tool for patients at risk of occult cardiac injuries. However, how to select patients that could benefit from this procedure remains unclear. We aimed to identify clinical predictors of positive SPW in patients with penetrating precordial injuries.

Materials And Methods: Prospective data collection of 183 patients who underwent SPW for the exclusion of penetrating cardiac injuries during 2002 - 2004 at a level I trauma centre in Cali, Colombia. Patient's demographics, clinical characteristics, and injury information were obtained. Independent predictors of positive SPW were assessed using stepwise logistic regressions.

Results: There were 41 positive SPW (22.4%). Unadjusted analyses demonstrated that stab/knife wounds (OR 2.48, 95% CI 1.17-5.25, p = 0.017), single wound (OR 14.61, 95% CI 1.9-110, p = 0.009), and clinical signs of pericardiac tamponade (OR 8.52, 95% CI 3.92-18.4, p < 0.001) were associated with increased odds of positive SPW. Conversely, systolic blood pressure (0.98, 95% CI 0.96-0.99) and stable physiological index (OR 0.31, 95% CI 0.14-0.65, p = 0.002) were associated with decreased odds. In multivariable analyses, signs of pericardiac tamponade (OR 6.37, 95% CI 2.78-14.6, p < 0.001), and single injuries (OR 12.99, 95% CI 1.6-102.7, p = 0.015) remained as independent predictors of positive SPW.

Conclusion: Emphasis on early recognition of the clinical signs of pericardiac tamponade could be the most important factor for the identification of occult cardiac injuries. Patients with multiple wounds to the precordial region who reached the hospital may not benefit from a SPW. However, high level of awareness is important because the incidence of occult cardiac injuries is not negligible.