The PERC rule has been a welcome addition to the emergency department evaluation of patients with chest pain or dyspnea suspected of pulmonary embolism. This has allowed a reduction in D-dimer testing in low risk patients. The traditional saturation cut-off of 95% can pose a challenge for patients seen at higher elevations where mild hypoxemia can be a normal physiologic parameter. At these elevations patients can flunk the PERC rule due to borderline hypoxemia with oxygen saturation levels in the 93-94% range, despite all other PERC rule criteria being negative. This can result in D-dimer testing and the associated risk of unnecessary CT radiation exposure in the event of a false positive D-dimer.
Tag Archive for: PE
Background: In patients with symptoms of pulmonary embolism (PE), we often turn to vital signs, including heart rate, respiratory rate and pulse oximetry, as part of our initial impression of the patient. Before even considering further testing, such as d-dimer or CTPA, we look first at the vital signs to form our gestalt impression of the patient. Clinical decision making tools are utilized in one static point in time, but gestalt decision-making occurs over the course of the patient’s entire stay in the Emergency Department (ED). Because of this, clinicians may use changes in vital signs to augment their differential diagnosis or to justify their belief that a PE work up is not necessary.
Background: The care of venous thromboembolism (VTE) is currently undergoing a paradigm shift in the US with an increasingly large percentage of patients being discharged home from the Emergency Department (ED). It wasn’t too long ago that all patients diagnosed with deep vein thrombosis (DVT) and pulmonary embolism (PE) would be admitted for anticoagulation. Some of the reasons for this were lack of literature to support outpatient therapy in the US, inability to arrange outpatient follow up, and, of course, medicolegal concerns. Dr. Jeff Kline, one of the thought leaders in VTE, advocates for the outpatient treatment of “low-risk” patients using a modified Hestia criteria supplemented with additional criteria (POMPE-C) for patients with active cancer. This publication is the initial results of his rivaroxaban-based treatment protocol. Read more →
Welcome to the September 2015 REBELCast, where Swami, Matt, and I are going to tackle a couple of topics in the world of Venous Thromboembolism (VTE). Seems like we are hearing more and more about VTE in terms of workup, management, etc. Lets face it, diagnosing someone with a pulmonary embolism (PE) is no longer as simple as checking a d-dimer or just doing a CT Pulmonary Angiogram. There is so much more to it and to frustrate physicians even more there is so much research coming out on this topic alone, even I am having a hard time keeping up. Swami, Matt, and I thought it might be good to tackle a couple of articles from he world of VTE that have implications for clinical practice and patient care. So with that introduction today we are going to specifically tackle:
- Topic #1: Home Treatment of Low Risk Venous Thromboembolism with Rivaroxaban
- Topic #2: RV Dilation on Bedside Echo Performed by ED Physicians
D-dimer has been shown to increase with age, which can cause a lower specificity (i.e. more false positive tests) in older patients. The result of this would be that older patients would often have more diagnostic imaging or downstream testing, but on the other hand, maybe a higher cut-off d-dimer value may lead to increased false negative cases (i.e. missed venothromboembolism) and make this strategy less safe. Recently, I wrote a post on age-adjusted d-dimer testing on REBEL EM, but since that post there was a new article that was published in Chest 2014. This post, will specifically focus on an update of age-adjusted d-dimer testing based on the above article. Read more →