Acute Massive Pulmonary Embolism with Cardiopulmonary Resuscitation
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Good neurological recovery after rescue thrombolysis of presumed pulmonary embolism despite prior minutes CPR
Jiang-Ping Wu1, Dan-Yan Gu2, Sheng Wang1, Zhen-Jun Zhang1, Jian-Cang Zhou2, Rui-Feng Zhang3
Abstract: We reported the case of a year-old man who was admitted to neurologic wards for recurrent syncope for 3 years. Unfortunately, just 2 hours after his admission, he suddenly collapsed and failed to return of spontaneous circulation (ROSC) after a minute standard cardiopulmonary resuscitation (CPR). Fortunately, he was timely suspected to have pulmonary embolism (PE) based on his sedentary lifestyle, elevated D-dimer and markedly enlarged right ventricle chamber on bedside echocardiography. After a rescue thrombolytic alteplase therapy, he was successfully resuscitated and good neurological recovery was achieved.
Keywords: Cardiac arrest; pulmonary embolism (PE); thrombolysis
Submitted Sep 01, Accepted for publication Nov 13,
Pulmonary embolism (PE) causes about 5% to 10% of all cardiac arrests (1). Whenever an atraumatic cardiac arrest happened to a previously healthy adult, it is of paramount importance to search for underlying etiology besides the implement of standard cardiopulmonary resuscitation (CPR). Specifically, for cardiac arrest caused by massive PE, an earlier thrombotic therapy based on presumptive diagnosis of PE may significantly improve patients’ outcomes (2). However, it is still a challenge to make the timely diagnosis of PE in clinical practice, especially under the scenario of cardiac arrest. Herein, we reported a year-old man with suddenly cardiac arrest and failed to return of spontaneous circulation (ROSC) after a minute CPR. Then a rescue thrombolytic alteplase saved his life since he was highly suspected to have PE.
A year-old man was admitted to neurologic department for evaluation of recurrent syncope. He had no associated chest pain, fever, or respiratory symptoms. He was otherwise healthy except a prior MRI demonstrated some minor lacunar infarctions which did not affect his speaking or movement. He was in a sedentary lifestyle after retirement, sitting at least 8 hours every day. The electrocardiogram showed sinus tachycardia with right bundle branch block. On physical examination, he was alert and with mild shortness of breath. Vital signs on presentation included heart rate beats/min, blood pressure /78 mmHg, and respiratory rate 16 breaths/min. Oxygen saturation on room air was 95%. Echocardiography demonstrated sizes of four heart chambers were normal and the right ventricular systolic pressure was 63 mmHg. Approximate 2 hours after his arrival in neurologic ward when he was enjoying his dinner, the patient suddenly fell into unconsciousness and the saturation decreased to 90% while the heart rate and respiratory rate increased to beats/min and 48 breaths/min, respectively. Approximate 10 minutes later, he restored his consciousness and complained shortness of breath and the oxygen saturation on room air was 90%. Shortly afterwards, his condition rapidly deteriorated and progressed to cardiopulmonary arrest with pulseless electric activity (PEA). Prompt CPR was initiated and epinephrine 1 mg was administered immediately. Ventricular fibrillation was demonstrated once after approximate 20 minutes CPR, therefore, electrical defibrillations were applied but failed. Thereafter, recurrent narrow QRS complex PEA at a rate around beats per minute dominated the next 60 minutes of CPR, with intermittent ROSC was observed. Given the refractory PEA during the cardiac arrest, potential reversible reasons for cardiac arrest were evaluated as the CPR continued. Another bedside echocardiography demonstrated markedly dilated right ventricle deviating to the left side which significantly depressed the left ventricular systolic function. By incorporating echocardiographic findings, his sedentary lifestyle and D-dimer was μg/mL (reference range, ug/mL), the patient was deemed to have high likelihood of PE. A bolus dose of 5 mg of alteplase was administered and another 45 mg alteplase was given continuously. Approximate 2 minutes after the alteplase infusion, the refractory PEA returned into sinus rhythm and a stable spontaneous circulation was achieved under continuous dopamine support. Overall, the patient underwent approximate minutes of standard CPR. Echocardiography after thrombolysis demonstrated the size of left ventricle was restored although the size of right ventricle was slightly enlarged and the right ventricular systolic pressure was decreased to 45 mmHg. After stabilization and observation for the night, the patient underwent a computed tomography pulmonary angiography which confirmed extensive bilateral pulmonary emboli and no intracranial bleeding (Figures 1 and 2A). The patients had a massive necrosis of intestinal mucosa after thrombolysis and acute kidney injury which necessitated renal replacement treatment for 3 months. During the following week, constant heparin infusion was administered and later was shifted to warfarin for anticoagulation. One week later, after withdrawn of sedation, the patient became awake and alert. Another head CT scan performed 6 days after thrombolysis demonstrated ischemic infarction and mild intracranial bleeding in the right occipital lobe (Figure 2B). However, the heparin was continued and a third head CT at 10 days post thrombolysis did not show enlarging intracranial hemorrhage (Figure 2C). Currently, the patient is alert and is on a physical rehabilitation program but no major neurological sequelae related to his cardiac arrest (Figure 2D).
Figure 1 Computed tomographic pulmonary angiography demonstrated extensive bilateral pulmonary emboli (arrow) (A-D).
Figure 2 (A) Computed tomogram (CT) approximate 17 hours post thrombolysis demonstrated old infarction of the right occipital lobe but no intracranial bleeding; (B) six days after thrombolysis showing subarachnoid bleeding in the right occipital lobe; (C) CT of 10 days after thrombolysis did no show enlarging of the bleeding although constant infusion of heparin; (D) CT of 3 months later after the thrombolysis.
Mortality due to cardiac arrest following massive PE ranges from 65% to 95% (3). As a result of persisting mechanical obstruction by PE, routine CPR is often ineffective. Given the poor outcome of prolonged unresponsive cardiac arrest and the fact that vast majority of cardiac arrest were caused by acute myocardial infarction or PE, empirical thrombolytic therapy seems to be intuitive appeal for cardiac arrests. However, a recent study from New England Journal of Medicine demonstrated that unselected thrombolysis for cardiac arrest patients was not all beneficial (4). Nevertheless, both the American Heart Association and European Resuscitation Council recommend “considering” use of fibrinolytic therapy when cardiac arrest is caused by proven or suspected acute PE (5,6). In patients presenting with cardiac arrest as a consequence of acute PE, thrombolytic therapy was associated with significantly higher ROSC (81% vs. 43%, P=) (7). Overall, fibrinolysis reduced the risk of death by around 55% (8). In a recent study by Er et al. (9) shown that for cardiac arrests caused by PE, earlier initiated thrombosis after cardiac arrest onset ( vs. min) was associated with higher rate of ROSC eventually. Moreover, for those who were eventually discharged, thrombolysis was given with less delay ( vs. min). Therefore, the earlier rescue thrombolysis was administrated for patients with cardiac arrest and presumptive diagnosis of PE, the better outcome it would be. In our case, however, the thrombolysis was somewhat delayed because the relative inexperience of neurologic physicians who were involved in the primary resuscitation and the CPR continued for nearly minutes overall until the presumptive diagnosis was established by the consulted intensive care physician. Given an approximate 30 minutes of CPR is adopted by many physicians for cardiac arrests currently, a longer time of CPR may be associated with higher rate of ROSC, especially for patients caused by massive PE and received a timely thrombolytic therapy.
In fact, it could be extremely difficult to explore the etiology of cardiac arrest while a patient is being resuscitated, specifically for physicians outside ICU. However, certain physiologic precepts have a stronger association with PE, lending confidence to presumptive diagnosis in the absence of evident alternative etiologies (2). For example, a rapid, narrow QRS PEA rhythm with observed myocardial contraction on echocardiography may have a higher association with PE (10). A triad of witnessed cardiac arrest, age less than 65 to 70 years, and PEA as the initial rhythm was seemed to be more likely associated with massive PE (11,12). The following factors were proved to have the highest association with the diagnosis of PE: unilateral leg swelling, oxygen saturation less than 95%, active cancer, recent prolonged immobilization or orthopedic surgery (2). Importantly, a high index of suspicion for PE should be maintained especially in cardiac arrest patient who had a history or symptom profile associated with this diagnosis. In clinical practice, a rapid integration of patients’ information, bedside diagnostic tools and available laboratory findings could be relied on to determine the level of suspicion of PE. With respect to the diagnostic tool, a portable echocardiography is ideal because it can differentiate shock categories and recognize the characteristics of PE even during CPR. Moreover, transesophageal echocardiography can reliably establish the cause of a circulatory arrest during CPR (13,14). However, for those who can be stabilized, a computed tomography pulmonary angiography will demonstrate filling defects in the main or lobar pulmonary arteries. As mentioned, we made the presumptive diagnosis of PE by integrating the patient’s lifestyle, elevated D-dimer, and findings of bedside echocardiography.
Given the bleeding risk associated with thrombolytic therapy, this intervention should only be administrated after balancing the potential benefits of improved outcomes and bleeding risk. Of the potential bleeding risk, the intracranial hemorrhage is the most devastating complication (2). Major bleeding was reported to occur in % of patients receiving thrombolytic therapy for acute PE while intracranial hemorrhage reported to be approximate 3% (15). There was a mild bleeding after thrombolysis in our case, however, no enlargement was noticed even under constant infusion of heparin for anticoagulation for the PE. Nevertheless, risk stratification models for bleeding are warranted to identify the individuals at the highest risk of hemorrhagic complications. In the recent large Pulmonary Embolism Thrombolysis (PEITHO) trial, incidence of major bleeding and intracranial hemorrhage was % and 2% respectively (16). Interestingly, bleeding risk was lower and mortality benefit was higher in patients <75 years. This is consistent with a recent meta-analysis that although use of thrombolytics was associated with increased risks of major bleeding and intracranial hemorrhage, major bleeding was not significantly increased in patients 65 years and younger (17). Hence, attenuation of the bleeding risk in individuals 75 years and younger may suggest a stronger indication for thrombolysis in those patients. Moreover, a risk score based on six variables (age >75 years, recent bleeding, cancer, creatinine levels > mg/dL, anemia, or PE at baseline) documented at entry can identify patients with venous thromboembolism at low, intermediate, or high risk for major bleeding during the first three months of therapy (18). However, given the outcomes of cardiac arrest due to PE are uniformly poor and thrombolysis therapy is generally deemed as ‘‘last chance’’ under many circumstances, even for patient with contraindication such as recent intracranial hemorrhage, a good outcome could be achieved (8). Under this circumstance, contraindications of thrombolytic therapy are frequently disregarded because the potential benefit outweighs the bleeding risk.
In summary, early recognition of etiology is of paramount importance for successful resuscitation of patients with atraumatic cardiac arrest. For cardiac arrest caused by massive PE, a good neurological recovery could be achieved by rescue thrombolysis despite a prolonged minutes CPR.
Disclosure: The authors declare no conflict of interest.
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Cite this article as: Wu JP, Gu DY, Wang S, Zhang ZJ, Zhou JC, Zhang RF. Good neurological recovery after rescue thrombolysis of presumed pulmonary embolism despite prior minutes CPR. J Thorac Dis ;6(12):EE doi: /j.issn
Patients who had out-of-hospital cardiac arrest (OHCA) with confirmed pulmonary embolism (PE) and received thrombolysis during cardiopulmonary resuscitation (CPR) had significantly higher day survival rates compared with patients who did not receive thrombolysis, according to retrospective observational multicenter study results published in CHEST.
PE-related OHCA is rare, occurring in 2% to 5% of all cases of OHCA, and is associated with a poor prognosis. Fortunately, thrombolysis can reduce mortality, decrease the risk of developing chronic thromboembolic pulmonary hypertension, and improve quality of life in patients with massive PE. However, whether or not thrombolysis during resuscitation can favor the return of spontaneous circulation and improve survival in patients with PE-related OHCA is unclear.
Therefore, researchers in France analyzed adults with OHCA who were managed by a mobile intensive care unit and received a diagnosis of PE that was confirmed on hospital admission. Of these patients, 58 received thrombolysis during CPR, 43 received tenecteplase (74%), 14 received alteplase (24%), and 1 received streptokinase (2%). The researchers found that day survival was higher in the thrombolysis group than the control group (16% vs 6%; P =), but that good neurologic outcome was not significantly different (10% vs 5%; adjusted relative risk, ; 95% CI, ). Length of stay in the intensive care unit ranged from 0 to 5 days in the thrombolysis group and 0 to 3 days in the control group (P =).
We found that thrombolysis during [CPR] was associated with higher day survival in PE-related OHCA, the researchers concluded. However, a large randomized controlled trial is needed to confirm these results.
Javaudin F, Lascarrou JB, Le Bastard Q, et al. Thrombolysis during resuscitation for out-of-hospital cardiac arrest caused by pulmonary embolism increases day survival: findings from the French National Cardiac Arrest Registry [published online August 2, ]. CHEST. doi/j.chest
Topics:General PulmonologyPulmonary EmbolismSours: https://www.pulmonologyadvisor.com/home/general-pulmonology/thrombolysis-improves-survival-in-pulmonary-embolism-related-cardiac-arrest/
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Embolism cpr pulmonary
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