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Francesca N. Delling October 17, 2007 Cardiac Tamponade.

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Presentation on theme: "Francesca N. Delling October 17, 2007 Cardiac Tamponade."— Presentation transcript:

1 Francesca N. Delling October 17, 2007 Cardiac Tamponade

2 Etiology Physiology - comparison with constrictive pericarditis Types of tamponade Diagnosis - clinical presentation, physical exam, EKG, CXR, echo Treatment Tamponade

3 Etiologies Infectious –Viral (coxsackie B, echovirus, influenza) –Bacterial –Others: TB, fungal, toxoplasmosis Neoplastic Uremic Trauma / cardiac surgery / aortic dissection / cardiac procedures Radiation Connective tissue disease (RA, SLE, scleroderma) Myocardial ischemia / infarct Myxedema Idiopathic

4 Physiology Exaggerated ventricular interaction During inspiration  greater RV inflow and outflow and concurrent decrease in LV size, outflow tract flow velocity profile and mitral valve inflow During expiration  LV filling and LV outflow augmented at the expense of reduced RV volume and Doppler flow velocities

5 Physiology Normal pericardium Increasing pericardial pressure Increasing filling pressures RVEDP = LVEDP Equalization of diastolic pressures

6 Comparison with constrictive pericarditis Features in common - diastolic dysfunction and preserved ventricular ejection fraction - heightened ventricular interaction - increased respiratory variation of ventricular inflow and outflow manifested clinically by pulsus paradoxus (less frequent in constrictive pericarditis) - equally elevated central venous, pulmonary venous, and ventricular diastolic pressures Distinctive features - tamponade  pericardial space is open and transmits respiratory variation in thoracic pressure to heart (pericardium does not see fluctuation in thoracic pressure in constrictive pericarditis) - constrictive pericarditis: venous return does not increase with inspiration. Diminished LV and increased RV volume are 2/2 lesser pressure gradient from the pulmonary veins

7 Types of tamponade Acute tamponade - Due to trauma, rupture of the heart or aorta or complication of an invasive diagnostic or therapeutic intervention - Sudden in onset - Hypotension common Subacute tamponade - Pericardial fluid accumulates slowly - Hypotension with a narrow pulse pressure, reflecting limited stroke volume. However, patients with preexisting hypertension may remain hypertensive due to increased sympathetic activity

8 Acute vs chronic tamponade

9 (continued) Low pressure tamponade - Severely hypovolemic pts (hemorrhage, hemodyalisis, or overdiuresis)  intracardiac and pericardial diastolic pressures are only 6 to 12 mmHg  fluid challenge usually elicits typical tamponade hemodynamics Regional tamponade - caused by a loculated, eccentric effusion - typical physical, hemodynamic, and echocardiographic signs of tamponade may be absent Types of tamponade

10 Clinical Presentation Tachypnea and exertional dyspnea  rest air hunger Weakness Presyncope Dysphagia Cough Anorexia (Chest pain)

11 Physical Exam Findings Tachycardia Hypotension  shock Elevated JVP with blunted y descent Muffled heart sounds Pulsus paradoxus (Pericardial friction rub)

12 JVP and pulsus paradoxus in tamponade Y descent blunted because of limited or absent lated diastolic filling of the right ventricle

13 Other causes of pulsus paradoxus Obstructive airway disease –Acute and chronic Constriction Restriction Pulmonary embolism RV infarction Circulatory failure

14 EKG pericarditis

15 EKG tamponade

16 EKG electrical alternans

17 Chest X-ray

18 Echocardiography  2D and M-mode RV diastolic collapse RA collapse/inversion IVC plethora  Doppler Exaggerated respiratory variation in mitral and tricuspid inflow velocities Phasic variation in right ventricular outflow tract/left ventricular outflow tract flow Exaggerated respiratory variation in inferior vena cava flow

19 Echocardiogram: RVDC Most commonly involves the RV outflow tract (more compressible area of RV) Occurs in early diastole, immediately after closure of the pulmonary valve, at the time of opening of the tricuspid valve When collapse extends form outflow tract to the body of the right ventricle, this is evidence that intrapericardial pressure is elevated more substantially

20 Parasternal long axis view

21 Beginning of systole ESDC M-mode

22 Short axis view

23 4 chamber view

24 Subcostal view

25 Beginning of systole ESDC M-mode

26 Echocardiogram: RA Inversion Right atrium normally contracts in volume with atrial systole In the presence of marked elevation of intrapericardial pressure, RA wall will remain collapsed throughout atrial diastole (early ventricular systole) Isolated RA inversion occurs during late diastole –Very sensitive but specificity = 86% –Positive predictive value = 50% RA Inversion Time Index (RAITI) - Calculated by dividing - Using 33% as the threshold Specificity = 100% Sensitivity = 94% Total # frames with inversion Total # frames in the cardiac cycle

27 M-mode across RA

28 Peak velocity of mitral inflow varies > 15% with respiration

29 Peak velocity of tricuspid inflow varies > 25% with respiration

30 IVC plethora

31 Predictable hierarchy of events Exaggerated respiratory variation of tricuspid inflow Exaggerated respiratory variation of mitral inflow Abnormal right atrial collapse Right ventricular free wall collapse

32 Instances when echo abnormalities are not seen Significant RV hypertrophy, usually due to PHTN Thickening of the ventricular wall due to malignancy, overlying inflammatory response or thrombus in hemorrhagic pericarditis Low-pressure tamponade (hypovolemic patients)

33 Echocardiogram: Additional roles Confirm size of the pericardial effusion –Small defined as < 100 mL –Moderate defined as 100 – 500 mL –Large defined as > 500 mL Confirm location of the pericardial effusion –Rule out loculated effusions Assist pericardiocentesis

34 Assessment of the patient Insignificant effusion –Flat neck veins –Normal BP, HR, RR, good perfusion Hemodynamically significant-Compensated –Elevated JVP –Mild paradox, No hypotension or tachycardia –Good perfusion –Mild RV collapse

35 Assessment of the patient Hemodynamically Severe-Max Compensation –Elevated JVP –Prominent paradox, Tachycardia –No hypotension-adequate perfusion –Chamber collapse on ECHO Hemodynamically Severe-Decompensated –Elevated JVP –Tachycardia, tachypnea –Hypotension with paradox –Chamber collapse, swinging heart

36 Pericardiocentesis Usually performed if more than 1 cm effusion Also performed if effusion smaller in the setting of acute trauma and hemodynamic compromise Pericardial window if need for biopsies and if evidence of coaugulopathy

37 RB 74 yo male with recently diagnosed adenocarcinoma of undetermined primary who presented to ED on 10/6 with chest pain

38 RB BP 125/65, pulsus paradoxus of 12 JVP 12 cm PMI located in 5 th ICS, distant heart sounds Faint crackles lung bases

39 RB CT chest consistent with large pericardial effusion and moderate compression of right ventricle Worsened metastatic disease including enlargement of subclavicular, mediastinal, right hilar lymph nodes and pulmonary nodules Stat echo showing…

40 10/6 TTE

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43 10/6 pericardiocentesis Drainage of 400 cc of bloody fluid Pre-procedure: pulsus 20 mmHg, cardiac output 3.8 Post-procedure: pulsus < 10 mmHg, cardiac output 5.0

44 TTE post-procedure

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47 Thank you


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