Localized pericardial tamponade: Does it always need exploration?
Monish S Raut1, Arun Maheshwari1, Ganesh Shivnani2 1 Department of Cardiac Anesthesia, Dharma Vira Heart Center, Sir Ganga Ram Hospital, New Delhi, India 2 Department of Cardiac Surgery, Dharma Vira Heart Center, Sir Ganga Ram Hospital, New Delhi, India
A 48-year-old female patient underwent coronary artery bypass surgery. One-hour after surgery, the patient developed hemodynamic instability. Transthoracic echocardiography (TTE) was inconclusive. Transesophageal echocardiography (TEE) was performed and it revealed localised collection around right atrium. In spite of the evidence of localized tamponade, wait and watch policy was employed rather than re-exploring the patient emergently. The patient recovered uneventfully. If hemodynamics remain stable and there is no fall in hematocrit and no increase in effusion on TEE/TTE examination, then localized tamponade can be managed conservatively without reexploring the patient.
How to cite this article: Raut MS, Maheshwari A, Shivnani G. Localized pericardial tamponade: Does it always need exploration?. Ann Card Anaesth 2014;17:67-9
How to cite this URL: Raut MS, Maheshwari A, Shivnani G. Localized pericardial tamponade: Does it always need exploration?. Ann Card Anaesth [serial online] 2014 [cited 2021 May 11];17:67-9. Available from: https://www.annals.in/text.asp?2014/17/1/67/124149
Pericardial tamponade is a potentially fatal complication after cardiac surgery. Its incidence ranges from 0.2% among patients undergoing coronary artery bypass graft surgery to 8.4% in heart transplant patients. ,, Clinical and hemodynamic parameters may not be reliable to diagnose the localized tamponade accurately as classic features of generalized pericardial tamponade may be absent in such cases. It requires prompt diagnosis and appropriate management to avoid cardiovascular collapse. Transesophageal echocardiography (TEE) allows a rapid diagnosis and an opportunity to institute appropriate therapeutic measures.
A 48-year-old female patient with triple vessel disease and an ejection fraction of 48% underwent an uneventful off-pump coronary artery bypass grafting. One-hour post-surgery, patient had hemodynamic instability - systolic arterial blood pressure was in the range of 80-90 mmHg on inotropic support of adrenaline (0.08-0.1 μg/kg/min), heart rate of 98/min, central venous pressure (CVP) 10-12 mmHg. Serum lactate level was in the range of 1.5-2 mmol/l and urine output was 0.5-1 ml/kg/h. Hemoglobin was maintained at 10 g/dl by transfusing 1unit packed red blood cells. Transthoracic echocardiography (TTE) - apical and subcostal views showed good bi-ventricular function with trace pericardial effusion (<1 cm) but other structures could not be evaluated due to poor echo window. TEE in midesophageal (ME) bicaval view showed a localized fluid collection measuring 3.27 cm × 6.86 cm [Figure 1] and [Figure 2]. Localized collection was compressing the right atrium (RA) thereby decreasing ventricular filling [Video 1] and [Video 2] , which explained hypotension. Patients' volume status was optimized and positive end expiratory pressure was lowered from 7 cmH2O to 2 cmH2O to favor right sided filling. TEE was performed hourly for initial 4 h to assess the size of the effusion and its hemodynamic impact. Thromboelastogram was performed, which showed normal parameters. Mediastinal chest tubes were repeatedly checked for patency. Hemoglobin and hematocrit evaluation was done regularly. There was no significant drop in hemoglobin level and trend of serum lactate level was not rising. Patient was mechanically ventilated for 12 h post-operatively until hemodynamics was stabilized. Mediastinal chest tube drainage over 12 h was 350 ml. Repeat TEE imaging after 8 h in ME four chamber and bicaval views showed decreased collection (<1 cm) with no significant effect on RA and ventricular filling. The systolic arterial pressure stabilized to 120 mmHg, CVP decreased to 8-10 mmHg, adrenaline infusion decreased to 0.2 μg/kg/min and serum lactate level decreased to 0.8 mmol/L. Thereafter the patient remained stable and was extubated. Patient was discharged on the 7 th post-operative day without any evidence of pericardial effusion on TTE.
Figure 1: Transesophageal echocardiography image showing extrinsic compression of the RA by a localized fluid collection. The probe was rotated rightward from the four‑chamber view. The closed tricuspid valve show this to be a systolic frame, when the RA should be filled
Most patients with localized pericardial effusion present without classical or echocardiographic signs.  Pulsus paradoxus may not be present in patients with isolated right-heart tamponade. Echocardiographically, transmitral and transtricuspidal respiratory flow variations may be absent because of the constantly raised left ventricular filling pressure.  Localized right-heart tamponade has been characterized by elevation of RA pressure more than pulmonary capillary wedge pressure, along with the signs mimicking right ventricular dysfunction such as prominent neck veins, low cardiac output and low blood pressure.  In the present case, CVP was not very high despite localized tamponade compressing RA. It may be due to increased venous compliance. Filling pressure may not be always correct in reflecting volume status of the patient.  Such altered relationship between pressure and volume can make the evaluation of such patients difficult. The TTE may not be conclusive in the post-operative period due to positive pressure ventilation, chest tubes and supine position. Visualization of all cardiac chambers may not be possible with TTE and generally, the apical position is the only available window. In the present case, TTE was not able to detect localized effusion along the free wall of RA due to its distant location in the far field of the acoustic window. Other hemodynamic monitors like Swan-Ganz catheter More Details and derived parameters can only suggest low cardiac output state, but may not be able to give the diagnosis of cardiac tamponade. It has been emphasized repeatedly that TEE provides more accurate and precise diagnosis in cardiac surgical patients. , TEE is an invaluable tool in diagnosing the cause of hemodynamic instability in critically ill patients,  especially after cardiac surgery , Echocardiography is safe and effective to detect rapidly developing pericardial effusion after cardiac surgery.  Though the pericardium may be left open following surgery, acute accumulation of only a moderate amount of blood can readily cause cardiac tamponade in a post-operative patient.  Right ventricular diastolic collapse is important echocardiographic sign of tamponade in the presence of circumferential effusion.  However, when the effusion is loculated or right-sided pressures are elevated, this sign may be absent.
Cardiac tamponade with hemodynamic compromise is a surgical emergency and needs immediate re-opening.  Removal of accumulated pericardial fluid commonly produces significant hemodynamic improvement because of the steep pericardial pressure volume relationship.  Hoit and Fowler  and Little and Freeman,  recommended drainage if the effusion is more than 20 mm and if there is collapse of the right chambers on ultrasound or if the duration has been less than 1 month, given the high risk for the development of tamponade. , These criteria can be applied to post-operative cardiac patients. In the present case, despite evidence of localized tamponade, a wait and watch policy was successfully employed rather than re-exploring the patient immediately. We suggest that if hemodynamics is maintained and there is no fall in hematocrit and there is an absence of increase in effusion echocardiographically, then localized tamponade can be managed conservatively without re-exploring the patient. In such scenario, TEE may play an important role in monitoring cardiovascular hemodynamics. However, in hemodynamically compromised patients such localized compression need be drained to achieve early hemodynamic stability.
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