Marc Kanter

Triage vital signs do not correlate with serum lactate or base deficit, and are less predictive of operative intervention in penetrating trauma patients: a prospective cohort study

Background Triage vital signs are often used to help determine a trauma patients haemodynamic status. Recent studies have demonstrated that these may not be very specific in determining major injury. The purpose of this study was to determine if there is any correlation between triage vital signs, base deficit (BD) and lactate, and to determine the odds of operative intervention in penetrating trauma patients. Methods A prospective observational cohort study was undertaken. Baseline vital signs, BD and lactate were recorded in all patients for whom the trauma team was activated. Pearson correlation and coefficient (ρ) were calculated. ORs were calculated. Results 75 patients were enrolled. Pearson correlations and coefficients calculated for lactate to systolic blood pressure were: −0.052 (ρ=0.0011, 95% CI −0.225 to 0.228); lactate and HR: 0.23 (ρ=0.0166, 95% CI −0.211 to 0.242); lactate and RR: 0.23 (ρ=0.054, 95% CI −0.174 to 0.277). BD to systolic blood pressure were: 0.003 (ρ=0.00001, 95% CI −0.229 to 0.224); BD and HR: −0.19 (ρ=0.038, 95% CI −0.399 to 0.038); BD and RR: −0.019 (ρ=0.0004, 95% CI −0.244 to 0.208). Odds of operative intervention were greater in patients with abnormally high lactate, OR 4.17 (95% CI 1.57 to 11), but not for BD, OR 2.53 (95% CI 0.99 to 6.45), or any of the vital signs. Conclusions Triage vital signs have no correlation to lactate or BD levels in penetrating trauma patients. Odds of operative intervention are greater in patients with abnormally high serum lactate levels, but not in those with abnormal triage vital signs or BD.

Human factors in the emergency department: Is physician perception of time to intubation and desaturation rate accurate?

Objective The main objective of the present study was to examine the perceived versus actual time to intubation (TTI) as an indication to help determine the situational awareness of Emergency Physicians during rapid sequence intubation and, additionally, to determine the physicians perception of desaturation events. Methods A timed, observation prospective cohort study was conducted. A post-intubation survey was administered to the intubating physician. Each step of the procedure was timed by an observer in order to determine actual TTI. The number of desaturation events was also recorded. Results One hundred individual intubations were included. The provider perceived TTI was significantly different and underestimated when compared with the actual TTI (23 s, 95% confidence interval (CI) 20.4–25.49 vs 45.5 s, 95% CI 40.2–50.7, P < 0.001, respectively). Pearson correlation coefficient of perceived TTI to actual TTI was r2 = 0.39 (95% CI 0.21–0.54, P < 0.001). The provider perceived desaturation rate was also significantly different from actual desaturation rate (13, 95% CI 3–12 vs 23, 95% CI 13–29, P = 0.05, respectively). The overall time to desaturation was 65.1 s. Conclusions Our findings have shown that providers perception of TTI occurs sooner than actually observed. Also, the providers were less aware of desaturation during the procedure.The main objective of the present study was to examine the perceived versus actual time to intubation (TTI) as an indication to help determine the situational awareness of Emergency Physicians during rapid sequence intubation and, additionally, to determine the physicians perception of desaturation events.

Comparing biomarkers of traumatic shock: the utility of anion gap, base excess, and serum lactate in the ED

BACKGROUND Biomarkers such as serum lactate, anion gap (AG), and base excess (BE) have been shown to be of use in determining shock in patients with seemingly normal vital signs. We seek to determine if these biomarkers can be used interchangeably in patients with trauma in the emergency setting based on their test characteristics and correlation to each other. METHODS A prospective observational cohort study was undertaken at an urban level 1 trauma center. Baseline vital signs, point-of-care BE, AG, and serum lactate were recorded in all patients who presented for trauma. Correlation was determined by linear regression model. Overall test characteristics and relative risk were calculated. RESULTS One hundred patients were enrolled. The median age was 30 years (interquartile range, 24-42 years), and 89% were male. Fifty-three percent of injuries were blunt trauma. Pearson correlation of serum lactate to BE was -0.81 (r(2) = 0.66; 95% confidence interval [CI], 0.53-0.75; P < .001), that of BE to AG was -0.71 (r(2) = 0.5; 95% CI, -0.80 to -0.57; P < .01), and that for serum lactate to AG was 0.71 (r(2) = 0.5; 95% CI, 0.57-0.80; P < .01). CONCLUSIONS This study demonstrates that the biomarkers have similar test characteristics which may make them interchangeable as indicators for the presence of occult shock in patients with trauma. Lactate and BE correlate well with each other; however, AG was not as strongly correlated with either.

Determining the Utility of Metabolic Acidosis for Trauma Patients in the Emergency Department

BACKGROUND Metabolic acidosis has been proposed as the gold standard to define shock in trauma patients. Other studies determine the presence of shock by use of serum lactate. However, not all medical centers have the ability to utilize point-of-care lactate at bedside. OBJECTIVE This study seeks to determine the relationship between serum lactate and metabolic acidemia in trauma patients, and if metabolic acidemia can be used to guide therapy. We hypothesized that acidemia would be strongly correlated with lactate levels and would be associated with activation of massive transfusion (MT) in the presence of shock in trauma. METHODS This was a prospective observational cohort study, level II evidence; this study aids in decision-making. Setting was a Level I academic, urban trauma center. The study took place from July 1, 2012 to March 1, 2013 and included patients who were ≥18 years old and required trauma team activation. Observations included baseline demographics (age, gender, type of injury), vital signs, point-of-care arterial blood gas, lactate, and need for MT. RESULTS One hundred patients were enrolled over the study period. The average age was 34 years, and 82% were male. Forty patients were acidemic (pH < 7.35), and there was a significant difference in lactate levels between the acidemic and non-acidemic groups (p < 0.002). We found a strong correlation between pH and lactate: rs = -0.38, t = -4.03, p < 0.001. In addition, using a logistic regression, we show that pH was associated with activation of MT (p = 0.002). CONCLUSION This is a prospective observational cohort study with level II evidence. This study demonstrates that acidemia was strongly correlated to serum lactate, lactate levels were higher in the acidemic group, and metabolic acidemia was associated with the activation of MT for trauma patients at our institution.

Waveform capnography: an alternative to physician gestalt in determining optimal intubating conditions after administration of paralytic agents

Purpose We sought to evaluate the utility of waveform capnography (WC) in detecting paralysis, by using apnoea as a surrogate determinant, as compared with clinical gestalt during rapid sequence intubation. Additionally, we sought to determine if this improves the time to intubation and first pass success rates through more consistent and expedient means of detecting optimal intubating conditions (ie, paralysis). Methods A prospective observational cohort study of consecutively enrolled patients was conducted from April to June 2016 at an academic, urban, level 1 trauma centre in New York City. Nasal cannula WC was used to determine the presence of apnoea as a surrogate measure of paralysis versus physician gestalt (ie, blink test, mandible relaxation, and so on). Results One hundred patients were enrolled (50 in the WC group and 50 in the gestalt group). There were higher proportions of failure to determine optimal intubating conditions (ie, paralysis) in the gestalt group (32%, n=16) versus the WC group (6%, n=3), absolute difference 26, 95% CI 10 to 40. Time to intubation was longer in the gestalt group versus the WC group (136 seconds vs 116 seconds, absolute difference 20 seconds 95% CI 14 to 26). First pass success rates were higher in the WC group verses the gestalt group (92%, 95% CI 85 to 97 vs 88%, 95% CI 88 to 95, absolute difference 4%, 95% CI 1 to 8). Conclusion These preliminary results demonstrate WC may be a useful objective measure to determine the presence of paralysis and optimal in tubating conditions in RSI.

Peri-intubation factors affecting emergency physician choice of paralytic agent for rapid sequence intubation of trauma patients

Introduction: No study has assessed predictors of physician choice between the succinylcholine (Succ) and rocuronium (Roc) for rapid sequence intubation (RSI) during the initial resuscitation of trauma patients in the emergency department (ED). Methods: We retrospectively evaluated of the use of Succ and Roc for adult trauma patients undergoing RSI at a Level 1 trauma center. The primary outcome was to identify factors affecting physician choice of paralytic agent for RSI analyzed by cluster analysis using pre‐intubation vital signs and early mortality. The secondary outcome was to identify factors influencing physician choice of paralytic agent using a logistic regression model reported as adjusted odds ratios (aOR). Results: The analysis included 215 patients, including 148 receiving Succ and 67 receiving Roc. The two groups were similar in regard to age, provider level of training, mean GCS (10 vs. 10) and median ISS (27 vs. 27). Cluster analysis using peri‐intubation patient vital signs and early mortality indicates that patients with predominantly abnormal vital signs and early mortality were more likely to receive Roc (74%) than those without abnormal vital signs prior to intubation or early mortality (24%). Hypoxemia prior to RSI (aOR 12.3 [2.5–60.9]) and the use of video laryngoscopy (VL) (aOR 5.5 [1.2–24.6]) were associated with the choice to use Roc. Conclusions: Roc was more frequently chosen for paralysis in the patient cluster with predominantly abnormal peri‐intubation vital signs and higher rate of early ED mortality. The use of Roc was associated with hypoxemia prior to RSI and VL.

Twenty-four-hour packed red blood cell requirement is the strongest independent prognostic marker of mortality in ED trauma patients

BACKGROUND Injury severity score, serum lactate, and shock index help the physician determine the severity of injuries present and have been shown to relate to mortality. We sought to determine if an increasing amount of packed red blood cells (PRBCs) given in the first 24hours of admission is an independent predictor of mortality and how it compares to other validated markers. METHODS A 6-year retrospective, observational study of adult trauma patients was conducted at a level 1 trauma center. Charts were reviewed for demographic data, amount of PRBC received in the first 24hours, injury severity score, shock index, and lactate levels. Subgroups were used to determine if each variable was an independent predictor of mortality. Correlation coefficients and linear regression were used to determine the strength of correlation between each variable and mortality. RESULTS One hundred fifty-seven patients met criteria over a 6-year period. The average age was 28years, 93% were male, and 86% had penetrating injuries. The average injury severity score, serum lactate, and shock index were 18, 6.1, and 0.9, respectively. The average amount of blood given was 6.7 U. CONCLUSION Twenty-four-hour PRBC requirement is both a novel independent predictor of and has the greatest correlation to mortality in adult trauma patients when compared to injury severity score, shock index, and serum lactate.