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Purpose: Respiratory rate is assessed less frequently than other vital signs, and documented respiratory rates are often erroneous. This pilot study compared respiratory rates derived from a wearable biosensor to those derived from capnography. Methods: Emergency department patients with respiratory complaints were enrolled and had capnography via nasal cannula and a wireless, wearable biosensor from Philips applied for approximately one hour. Respiratory rates were obtained from both of these methods. We determined the difference between median respiratory rates obtained from the biosensor and capnography and the proportion of biosensor-derived respiratory rates that were within three breaths/minute of the capnography-derived respiratory rates for each patient. A Spearman correlation coefficient was calculated to assess the strength of the correlation between mean respiratory rates derived from both methods. Plots of minute-by-minute respiratory rates, per patient, for each monitoring method were shown to two physicians. The physicians identified time periods in which the respiratory rates appeared invalid. The proportion of time with invalid respiratory rates for each patient, for each method, was calculated and averaged. Results: We analyzed data for 17 patients. Median biosensor-derived respiratory rate was 20 breaths/minute (range: 7–40 breaths/minute) and median capnography-derived respiratory rate was 25 breaths/minute (range: 0–58 breaths/minute). Overall, 72.8% of biosensor-derived respiratory rates were within three breaths per minute of the capnography-derived respiratory rates. Overall mean difference was 3.5 breaths/minute (±5.2 breaths/minute). Respiratory rates appeared invalid 0.7% of the time for the biosensor and 5.0% of the time for capnography. Conclusion: Our pilot study suggests that the Philips wearable biosensor can continuously obtain respiratory rates that are comparable to capnography-derived respiratory rates among emergency department patients with respiratory complaints.

Background Our objectives were to test whether during a potentially life‐threatening medical emergency, perceived threat (a patient’s sense of life endangerment) in the emergency department (ED) is common and associated with the subsequent development of posttraumatic stress disorder (PTSD) symptoms. Methods This study was an ED‐based prospective cohort study in an academic hospital. We included adult patients requiring acute intervention in the ED for resuscitation of a potentially life‐threatening medical emergency, defined as respiratory or cardiovascular instability. We measured patient‐perceived threat in the ED using a validated patient self‐assessment measure (score range = 0 to 21, with higher scores indicating greater perceived threat). We performed blinded assessment of PTSD symptoms 30 days after discharge using the PTSD Checklist for Diagnostic and Statistical Manual of Mental Disorders‐Fifth Edition (PCL‐5). Results Ninety‐nine of 113 (88%) patients completed follow‐up, with 98% reporting some degree of perceived threat, median (interquartile range [IQR]) perceived threat score 12 (6 to 17), and 72% reported PTSD symptoms in relation to their ED visit (median [IQR] PCL‐5 score = 7 [0 to 30]). Patients with respiratory instability had higher median (IQR) perceived threat scores (16 [9 to 18] vs. 9 [6 to 14)] and PCL‐5 scores (10 [2 to 40] vs. 3 [0 to 17]) compared to patients without respiratory instability. In a multivariable linear regression model adjusting for potential confounders, greater perceived threat in the ED was independently associated with higher PCL‐5 scores (β = 0.79, 95% confidence interval [CI] = 0.15 to 1.42). Among the individual perceived threat items, the feeling of helplessness during resuscitation had the strongest association with PCL‐5 score (β = 5.24, 95% CI = 2.29 to 8.18). Conclusions Perceived threat during potentially life‐threatening emergencies is common and independently associated with development of PTSD symptoms. Additional research to test whether reduction of perceived threat in the ED attenuates the development of PTSD symptoms following potentially life‐threatening emergencies is warranted.

Background Twenty‐five percent of patients presenting to the emergency department (ED) for a respiratory or cardiovascular medical emergency develop clinically significant posttraumatic stress disorder (PTSD) symptoms. It is possible that development of PTSD symptoms in this cohort is associated with subsequent adverse physical health events. Our objective was to test whether clinically significant PTSD symptoms 30 days postdischarge are associated with increased risk for hospital readmission within 24 months after discharge among patients presenting to the ED for a respiratory or cardiovascular emergency. Methods This was a prospective cohort study conducted between January 1, 2018, and December 31, 2020, at a U.S. academic medical center, including adult patients presenting with acute respiratory failure or cardiovascular instability requiring a potentially life‐sustaining intervention in the ED. PTSD symptoms 30 days postdischarge were measured using the PTSD Checklist for the Diagnostic and Statistical Manual of Mental Disorders‐5. The primary outcome was all‐cause hospital readmission over the subsequent 24 months after hospital discharge from the index ED visit. Results Of the 99 patients included, 73% (95% confidence interval [CI] = 63% to 81%) had a hospital readmission within 24 months. In a multivariable Cox proportional hazards model adjusting for potential confounders (e.g., age, severity of illness during index ED visit, preexisting comorbid conditions) presence of clinically significant PTSD symptoms at 30 days was independently associated with increased risk for all‐cause hospital readmission at 24 months (hazards ratio = 2.19, 95% CI = 1.30 to 3.69). These results remained statistically significant across multiple sensitivity analyses. Conclusions Hospital readmission is common among survivors of acute respiratory failure and cardiovascular instability, and PTSD symptoms 30 days postdischarge are an independent predictor of hospital readmission. Survivors of medical emergencies may warrant follow‐up evaluation for PTSD symptoms, and future research is warranted to better understand the relationship between psychological trauma and hospital readmission.