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CASE REPORT
Year : 2022  |  Volume : 32  |  Issue : 1  |  Page : 54-56

Isolated tricuspid regurgitation alternans in acute myocardial infarction: A rare entity


Department of Cardiology, Vedant Hospital, Thane, Maharashtra, India

Date of Submission03-Jun-2021
Date of Acceptance14-Dec-2021
Date of Web Publication20-Apr-2022

Correspondence Address:
Rakesh Agarwal
Department of Cardiology, Vedant Hospital, Thane, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jcecho.jcecho_46_21

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  Abstract 


Pulsus alternans is characterized by alternating strong and weak beats, and occurs with failing hearts. Left ventricular pulsus alternans is known to occur with ischemic heart disease, valvular heart disease, and outflow tract obstructions. Isolated right ventricular (RV) pulsus alternans is a rare entity. We report the case of a 51-year-old male patient who presented with inferior wall myocardial infarction and cardiogenic shock. He was diagnosed to have an isolated tricuspid regurgitation alternans signifying severe RV dysfunction. The patient was resuscitated and treated with primary percutaneous intervention to the right coronary artery. We also review the literature associated with RV pulsus alternans and its mechanisms.

Keywords: Ischemic heart disease, right ventricular alternans, tricuspid regurgitation alternans


How to cite this article:
Agarwal R. Isolated tricuspid regurgitation alternans in acute myocardial infarction: A rare entity. J Cardiovasc Echography 2022;32:54-6

How to cite this URL:
Agarwal R. Isolated tricuspid regurgitation alternans in acute myocardial infarction: A rare entity. J Cardiovasc Echography [serial online] 2022 [cited 2022 May 26];32:54-6. Available from: https://www.jcecho.org/text.asp?2022/32/1/54/343535




  Introduction Top


Pulsus alternans is an enigmatic entity that is known to occur with failing hearts. It is usually appreciated clinically with palpation of the radial pulses and signifies a reduced left ventricular systolic function. However, rarely an isolated right ventricular (RV) pulsus alternans may occur in the setting of RV dysfunction. Such discordant RV alternans can be associated with significant hemodynamic compromise. We describe a case of tricuspid regurgitation alternans detected on echocardiographic examination in the setting of RV myocardial infarction and review the literature associated with this condition in brief.


  Case Report Top


A 51-year-old male patient presented to the cardiology emergency room with chest heaviness and diaphoresis for 3 h. He was a known diabetic on long-acting insulin therapy and a smoker. The patient was pale with severe hemodynamic compromise. His blood pressure was 70/20 mmHg. An urgent ECG was obtained which revealed an acute inferior wall myocardial infarction [Figure 1]. An urgent echocardiography was performed which revealed hypokinetic inferior and inferior septal walls of the left ventricle. There was associated RV myocardial infarction with tricuspid annular plane systolic excursion of 10 mm. The patient had a moderate tricuspid regurgitation. However, the tricuspid regurgitation velocity showed marked beat-to-beat variation, alternating with every alternate beat suggestive of tricuspid regurgitation alternans [Figure 2].
Figure 1: Electrocardiography of the patient showing inferior wall myocardial infarction

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Figure 2: Echocardiography image depicting right ventricular alternans

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The patient was rapidly infused with intravenous fluids. Inotropic support was started and the patient was immediately taken up for revascularization as a primary percutaneous coronary intervention case. Coronary angiography revealed an occluded right coronary artery which was stented using a drug-eluting stent. His hemodynamics improved with subsequent disappearance of the pulsus alternans. The postoperative period of the patient was uneventful, and he was discharged 2 days later.

The patient provided written consent for this manuscript.


  Discussion Top


As many as 30%–50% of patients with inferior wall infarct can have associated RV infarctions.[1] In these cases, the culprit artery is most often an occluded right coronary artery, as seen in our case.

Pulsus alternans, first described by Traube in 1872, secondary to left ventricular systolic dysfunction is a widely known entity. Other causes of left ventricular alternans include coronary artery disease, mitral stenosis, prosthetic valve dysfunction, transient ischemia, dobutamine infusion, and outflow tract obstruction (aortic stenosis and hypertrophic cardiomyopathy).[2]

Biventricular alternans has uncommonly been described in the literature where RV alternans accompanies left ventricular alternans. Most of these patients are known to have severe left ventricular systolic dysfunction with accompanying RV involvement. It is known as synchronous or concordant in these cases.[1],[2]

Pulsus alternans is known as discordant mechanical alternans when it occurs isolated in the pulmonary or the systemic circulation. Isolated RV alternans is a rare entity and has been reported to occur in mitral stenosis, chronic obstructive pulmonary disease, primary pulmonary hypertension, and pulmonary embolism.[3],[4]

Isolated RV infarction is known to occur in <3% autopsies revealing infarction.[3],[4] In our case, the patient had tricuspid regurgitation alternans which was consistent with severe RV myocardial infarction and RV systolic dysfunction.

Two mechanisms have been proposed to explain the occurrence of pulsus alternans. The first theory assumes that a reduced stroke volume secondary to impaired contraction of a dysfunctional ventricle leads to elevated end-diastolic volumes in the next beat. This leads to a stronger contraction as per Frank–Starling mechanism. The second theory explains pulsus alternans on the basis of delayed uptake and release of calcium from the sarcoplasmic reticulum. This change in calcium cycling leads to development of pulsus alternans.[5]

RV function has traditionally been difficult to assess with echocardiography. Annular indices such as tricuspid annular excursion or S' velocity are unreliable and insensitive. Imaging the RV along its major axis is a challenge, and RV contractility does not necessarily equate with ventricular dysfunction. Furthermore, tricuspid regurgitation depends on volumetric metrics and can overestimate RV function.[6] The presence of RV alternans can signify a significant damage to RV myocardium and should be taken into account when evaluating RV function.

Pulsus alternans is an enigmatic entity that occurs with failing ventricles. However, isolated RV alternans has been rarely reported in the literature. Our case demonstrates objectively by means of echocardiography a clear case of tricuspid alternans in the setting of RV myocardial infarction.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient has given his consent for his images and other clinical information to be reported in the journal. The patient understands that name and initials will not be published and due efforts will be made to conceal his identity, but anonymity cannot be guaranteed.

Acknowledgment

The author would like to acknowledge Professor D.P Sinha, Senior Consultant Cardiology and Ex-Head of Department, IPGME and R and SSKM Hospitals, and Dr. Rashmi Baid, Fellow, Reproductive Medicine, Lilavati Hospital, for their support.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Jeffers JL, Boyd KL, Parks LJ. Right ventricular myocardial infarction. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2020.  Back to cited text no. 1
    
2.
Nguyen T, Cao LB, Tran M, Movahed A. Biventricular pulsus alternans: An echocardiographic finding in patient with pulmonary embolism. World J Clin Cases 2013;1:162-5.  Back to cited text no. 2
    
3.
Bansal RC, Johns VJ Jr., Willis WH Jr., Isaeff DM. Isolated right ventricular mechanical alternans in right ventricular infarction. Chest 1980;77:115-8.  Back to cited text no. 3
    
4.
Cournand A, Ferrer MI, Harvey RM, Richards DW. Cardiocirculatory studies in pulsus alternans of the systemic and pulmonary circulations. Circulation 1956;14:163-74.  Back to cited text no. 4
    
5.
Henery D, Tummala R. Pulsus alternans. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2021. Available from: https://www.ncbi.nlm.nih.gov/books/NBK557642. [Last updated on 2020 Nov 19].  Back to cited text no. 5
    
6.
Amsallem M, Kuznetsova T, Hanneman K, Denault A, Haddad F. Right heart imaging in patients with heart failure: A tale of two ventricles. Curr Opin Cardiol 2016;31:469-82.  Back to cited text no. 6
    


    Figures

  [Figure 1], [Figure 2]



 

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