Echocardiography of isolated subacute left heart tamponade in a patient with cor pulmonale and circumferential pericardial effusion

Is pulmonary hypertension protective against cardiac tamponade? A systematic review

The presence of pulmonary hypertension (PH) may affect whether cardiac tamponade physiology develops from a pericardial effusion. Specifically, the increased intracardiac pressure and right ventricular hypertrophy associated with PH would seemingly increase the intrapericardial pressure threshold at which the right-sided chambers collapse. In this systematic review, we examined the impact of PH on the incidence, in-hospital and long-term mortality, and echocardiographic findings of patients with cardiac tamponade. Using the PRISMA guideline, a systematic search was conducted in PubMed, Academic Search Premier, Web of Science, Google Scholar, and the Cochrane Database for studies investigating PH and cardiac tamponade. The Newcastle-Ottawa Scale was used to analyze the quality of returned studies. Primary outcomes included the incidence of cardiac tamponade, as well as in-hospital and long-term mortality rates. Secondary outcomes were the presence or absence of echocardiographic findings of cardiac tamponade in patients with PH. Forty-three studies (9 cohort studies and 34 case reports) with 1054 patients were included. The incidence of cardiac tamponade was significantly higher in patients with PH compared to those without PH, 2.0% (95% CI 1.2-3.2%) vs. 0.05% (95% CI 0.05-0.05%), p < 0.0001, OR 40.76 (95% CI 24.8-66.9). The incidence of tamponade in patients with a known pericardial effusion was similar in those with and without PH, 20.3% (95% CI 12.0-32.3%) and 20.9% (95% CI 18.0-24.1%), p = 0.9267, OR 0.97 (95% CI 0.50-1.87). In patients with tamponade, those with PH demonstrated a significantly higher in-hospital mortality than those without PH, 38.8% (95% CI 26.4-52.8%) vs. 14.4% (95% CI 14.2-14.6%), p < 0.0001, OR 3.77 (95% CI 2.12-6.70). Long-term mortality in patients with tamponade was significantly lower in those with PH than in those without PH, 45.5% (95% CI 33.0-58.5%) vs. 59.1% (95% CI 54.7-63.4%), p = 0.0258, OR 0.576 (95% CI 0.33-1.01). However, after stratifying by non-malignant etiologies, the long-term mortality benefit for those with PH disappeared. In the studies that described specific echocardiographic findings of cardiac tamponade, only 10.5% of patients with PH and tamponade showed right atrial and right ventricular collapse. When evaluating patients with pericardial effusions, physicians must recognize the effects of underlying PH on the incidence, in-hospital and long-term mortality rates, and potentially atypical echocardiographic presentation of cardiac tamponade.

Postsurgical Left Atrial Compression due to Hemopericardium Resulting in Liver Failure: A Rare Cause of Cardiac Tamponade

• Postoperative pericardial effusion may cause left-sided chamber compression. • Focal left-sided cardiac tamponade may present with atypical clinical or echo findings. • Focal tamponade can result in acute liver failure post–cardiac surgery.

Defying Occam's Razor: A Case of Pulmonary Embolism Masked By Cardiac Tamponade

BACKGROUND

Occam's razor instructs physicians to assume one single cause for multiple symptoms, whereas Hickam's dictum encourages them to suspect multiple concurrent pathologies. Although the general practice is to follow Occam's razor, occasionally Hickam's dictum reigns supreme. Here we present one such case, where the concurrent presence of two life-threatening pathologies posed clinical challenges in diagnosis and management.

CASE REPORT

Although cardiac tamponade and pulmonary embolism (PE) are known complications of malignancy, their concomitant existence is rare. Here we report a patient who presented with shortness of breath found to have both cardiac tamponade and submassive PE. Although the cardiac tamponade was initially diagnosed in the Emergency Department by bedside ultrasound and treated with pericardiocentesis, only a few hours later, when she deteriorated, the submassive PE was diagnosed, which was treated with heparin infusion and subsequently transitioned to a newer oral anticoagulant. The patient was later diagnosed as having primary breast cancer and metastatic lung adenocarcinoma. Why Should an Emergency Physician Be Aware of This? This raised unique diagnostic challenges, as both cardiac tamponade and PE present with obstructive shock. The increased right heart pressure from the PE could have paradoxically protected the patient from the tamponade effects of the pericardial effusion. Furthermore, the presence of cardiac tamponade may also mask the typical echocardiographic features of PE. The concurrent presence of two pathologies raised challenges and dilemmas in management. This case shows that physicians should maintain a high degree of suspicion of two pathologies when the patient deteriorates after the first pathology has been appropriately treated.

CRITICAL CARE ECHO ROUNDS: Haemodynamic instability

The use of echocardiography, whilst well established in cardiology, is a relatively new concept in critical care medicine. However, in recent years echocardiography's potential as both a diagnostic tool and a form of advanced monitoring in the critically ill patient has been increasingly recognised. In this series of Critical Care Echo Rounds, we explore the role of echocardiography in critical illness, beginning here with haemodynamic instability. We discuss the pathophysiology of the shock state, the techniques available to manage haemodynamic compromise, and the unique role which echocardiography plays in this complex process.

Misconceptions and facts about pericardial effusion and tamponade

Several common misconceptions can make the clinical diagnosis of subacute pericardial tamponade challenging. Widely known physical findings of pericardial tamponade lack sensitivity and specificity. Interpretation of echocardiographic signs requires good understanding of pathophysiology. Over-reliance on echocardiography may result in over-utilization of pericardial drainage procedures. Awareness of these misconceptions with an integrative approach to both clinical and imaging data will help clinicians to assess the hemodynamic impact of pericardial effusion and the need for drainage.