- Case report
- Open Access
Transient systolic anterior motion with junctional rhythm after mitral valve repair in the intensive care unit
Critical Ultrasound Journal volume 10, Article number: 30 (2018)
Systolic anterior motion (SAM) after mitral valve repair (MVR) can adversely affect hemodynamics due to exacerbation of left ventricular outflow tract obstruction and mitral regurgitation. Intraoperative transient SAM after MVR can usually be managed with hemodynamic maneuvers under continuous monitoring by transesophageal echocardiography (TEE). However, during postoperative intensive care management, transient SAM is seldom diagnosed and the start of treatment may be delayed. We present a case of transient SAM after MVR with abrupt deterioration due to junctional rhythm in the intensive care unit (ICU). TEE revealed that conversion from normal sinus rhythm into junctional rhythm induced the exacerbation of SAM. TEE was useful for identifying the etiology of unstable hemodynamics after cardiac surgery in the ICU, similar to its use in the operating room.
Systolic anterior motion (SAM) after mitral valve repair (MVR) can adversely affect hemodynamics due to exacerbation of left ventricular outflow tract obstruction (LVOTO) and mitral regurgitation (MR) . Although some mechanisms are understood, the effect of junctional rhythm on SAM, LVOTO, and MR remains unclear [1, 2]. Intraoperative transient SAM is usually diagnosed with transesophageal echocardiography (TEE), and should immediately be treated with hemodynamic agents under TEE monitoring. However, transient SAM in the ICU due to junctional rhythm without signs of ischemia can be difficult to diagnose. Even in this case, SAM cannot be thought of as the cause of hemodynamic disorder. Only TEE observation after an event can assist in the choice of treatment.
A 55-year-old man with severe MR and middle scallop prolapse due to torn chordae underwent MVR. Preoperative LV ejection fraction, tricuspid annular plane systolic excursion and right ventricular fractional area change were 62%, 26 mm and 44%, respectively. MVR was performed with folding middle scallop and annuloplasty with a 30-mm Physio II annuloplasty ring (Edwards Lifesciences LLC, Irvine, CA, USA). MR was well controlled. Despite difficulty weaning from cardiopulmonary bypass and some persistent surgical bleeding, he was hemodynamically stabilized on admission to the ICU without evidence of SAM and LVOTO.
He became hemodynamically unstable on the first postoperative day, with parameters as follows: heart rate 87 beats/min (bpm), sinus rhythm, arterial pressure 80/48 mmHg, pulmonary artery pressure 28/20 mmHg, central venous pressure 17 mmHg, cardiac index 1.7 L/min/m2, right ventricular stroke work index (RVSWI) 1.6 g/m2/beat, and mixed venous oxygen saturation (SvO2) 54%.
Transthoracic echocardiography (TTE) was performed to investigate the cause of hemodynamic deterioration; however, adequate images could not be obtained. TEE was then performed and showed right ventricular (RV) dysfunction without SAM and LVOTO. We decided to increase the dose of inotrope (adrenaline) to improve RV function and the hemodynamics stabilized.
Severe hypotension developed on the second postoperative day. Hemodynamic parameters were as follows: heart rate 90 bpm, arterial pressure 50/42 mmHg, pulmonary artery pressure 28/20 mmHg, central venous pressure 13 mmHg, cardiac index 1.6 L/min/m2, RVSWI 2.4 g/m2/beat, and SvO2 48%. The ventilator settings were as follows: pressure assist-control ventilation, respiratory rate 14 breaths/min, peak inspiratory pressure 16 cmH2O, inspiration time 1.6 s, positive end-expiratory pressure 10 cmH2O, and fraction of inspiratory oxygen 0.6.
Although the dose of dopamine, dobutamine and adrenaline was greatly increased to 5.4 µg/kg/min, 5.4 µg/kg/min and 0.05 µg/kg/min, respectively, and intra-aortic balloon pumping was started, hemodynamic parameters did not show improvement. No pulmonary vasodilator was used because of avoiding hypotension.
Repeat TEE revealed the hyperdynamic left ventricle (LV) without any regional wall motion abnormality, as well as LVOTO and severe MR (vena contracta 8 mm) due to SAM (Fig. 1; Additional file 1). In addition, RV dysfunction was still presented. We immediately reduced the inotrope dose and started vasopressors (vasopressin 2 unit/h) with volume loading (acetate Ringer 500 mL and 5% albumin 250 mL). SAM, LVOTO, and MR rapidly resolved and hemodynamic parameters stabilized. However, when normal sinus rhythm converted into junctional rhythm, SAM, LVOTO and severe MR recurred and hemodynamic parameters again became unstable (Figs. 2, 3; Additional files 2, 3, 4). TEE showed that conversion from normal sinus rhythm into junctional rhythm worsened the severity of SAM, LVOTO, and MR. The electrocardiogram showed junctional rhythm alternating with sinus rhythm, repeated at short intervals. We found that the rhythm change had a significant effect on the emergence of SAM and hemodynamic deterioration. Temporary atrial pacing was used to stabilize the heart rhythm. After starting atrial pacing, the hemodynamics stabilized and SAM, LVOTO, and MR did not recur (Fig. 4). He discharged from ICU on the 22nd postoperative day and from the hospital on the 43rd postoperative day.
We identified two important clinical issues. Junctional rhythm can cause deterioration of SAM, LVOTO, and MR, and atrial pacing can improve hemodynamics in unstable normal sinus rhythm. TEE is useful for the identification of causes of unstable hemodynamics after cardiac surgery in the ICU as well as in the operating room.
First, junctional rhythm can cause deterioration of SAM, LVOTO, and MR and atrial pacing can improve hemodynamics. Some mechanisms of SAM are related to geometric factors, kinetic factors, and structural abnormalities . Geometric factors include annular undersizing, anterior mitral valve displacement, low anterior:posterior leaflet length ratio, reduced mitro-aortic angle, and distance reduction between the MV coaptation point and interventricular septum . Hyperdynamic LV is a kinetic factor. Structural abnormalities include small LV, chordal anomalies, bulging interventricular septum, papillary muscle displacement, redundant posterior leaflet, and redundant anterior leaflet. Some authors reported that ventricular pacing or atrioventricular sequential pacing can affect the severity of SAM [5, 6]. In the present case, junctional rhythm caused deterioration of SAM. Junctional rhythm causes atrioventricular dyssynchrony and loss of atrial kick. These can contribute to decreases in mean arterial pressure and cardiac output by approximately 15% and the decreases can be accentuated in patients with heart disease [7, 8]. The mechanism by which junctional rhythm causes deterioration of SAM might be the impairment of LV filling due to atrioventricular dyssynchrony and loss of the atrial kick in junctional rhythm. In addition, underlying right ventricular dysfunction also plays a role in LV underfilling. There are some causes of RV dysfunction after cardiac surgery including inadequate myocardial protection during cardiac arrest, myocardial ischemia due to residual air, high pulmonary vascular resistance, and inadequate settings of mechanical ventilation . In the present case, the right cause of RV dysfunction is unclear; however, long CPB, residual air, compression for control of bleeding by the surgeons might be related to RV dysfunction.
The management of SAM depends on the underlying mechanism and severity. In most cases, volume loading, discontinuation or reduction of inotropic drugs, and administration of beta blockers and vasopressors can resolve SAM [10,11,12]. It has been demonstrated that conservative hemodynamic maneuvers for intraoperative transient SAM are reliable and result in good clinical outcomes, although some cases require surgical correction with second cardiopulmonary bypass . Since the present case had right ventricular failure, maintaining normal sinus rhythm seemed to be more important than in patients without right ventricular failure .
Second, TEE in the ICU is useful for the identification of causes of unstable hemodynamics after cardiac surgery. The usefulness of echocardiography for diagnosis and decision-making has been shown in the ICU, and basic echocardiography skills have become mandatory for all intensivists in some guidelines [15,16,17]. On the other hand, the use of TEE is reserved for instances in which diagnostic information for clinical decision-making cannot be obtained by TTE in a timely manner. However, TEE is considered an advanced skill and is not considered a minimum requirement for intensivists [17,18,19].
After cardiac surgery, obtaining useful images is sometimes difficult due to the narrowing of acoustic windows caused by the surgical incision, drapes, and drains. In addition, unclear images are insufficient for clinical decision-making in critical situations. Strengths of TEE include less dependence on operator skills and better spatial resolution compared to that of TTE . In the present patient, the causes of recurrent hemodynamic exacerbation were different and could not be diagnosed without TEE. Basic hemodynamic assessment with TEE is not that difficult and training in basic TEE skills with simulators is evolving [21, 22]. Thus, the barrier to learning of basic TEE skills by intensivists can be overcome.
This case report shows that junctional rhythm can cause deterioration of SAM, LVOTO, and MR, and can lead to unstable hemodynamics in a patient with right ventricular failure after MVR. Atrial pacing can resolve SAM, LVOTO, and MR and can improve hemodynamics in a patient with unstable normal sinus rhythm. TEE in the ICU can play a pivotal role in clinical decision-making. Given that there are various causes of hemodynamic deterioration after cardiac surgery and some cannot be diagnosed without TEE, both TTE and basic TEE skills are required for intensivists.
intensive care unit
left ventricular outflow tract obstruction
mitral valve repair
right ventricular stroke work index
systolic anterior motion
- SvO2 :
mixed venous oxygen saturation
Alfieri O, Lapenna E (2015) Systolic anterior motion after mitral valve repair: where do we stand in 2015? Eur J Cardiothorac Surg 48:344–346
Loulmet DF, Yaffee DW, Ursomanno PA, Rabinovich AE, Applebaum RM, Galloway AC, Grossi EA (2014) Systolic anterior motion of the mitral valve: a 30-year perspective. J Thorac Cardiovasc Surg 148:2787–2793
Ibrahim M, Rao C, Ashrafian H, Chaudhry U, Darzi A, Athanasiou T (2012) Modern management of systolic anterior motion of the mitral valve. Eur J Cardiothorac Surg 41:1260–1270
Maslow AD, Regan MM, Haering JM, Johnson RG, Levine RA (1999) Echocardiographic predictors of left ventricular outflow tract obstruction and systolic anterior motion of the mitral valve after mitral valve reconstruction for myxomatous valve disease. J Am Coll Cardiol 34:2096–2104
Milas BL, Bavaria JE, Koch CG, Troianos CA (2001) Case 8-2001. Resolution of systolic anterior motion after mitral valve repair with atrial pacing. J Cardiothorac Vasc Anesth 15:641–648
Ushijima T, Nishida T, Kan-O M, Tominaga R (2016) Left ventricular pacing can be a complementary solution for systolic anterior motion after mitral valve plasty. Eur J Cardiothorac Surg 49:1004–1005
Landesberg G, Hillel Z (2015) Electrocardiography, perioperative ischemia, and myocardial infarction. In: Miller RD (ed) Miller’s anesthesia, 8th edn. Saunders, Philadelphia
Haldemann G, Schaer H (1972) Haemodynamic effects of transient atrioventricular dissociation in general anaesthesia. Br J Anaesth 44:159–162
Haddad F, Couture P, Tousignant C, Denault AY (2009) The right ventricle in cardiac surgery, a perioperative perspective: II. Pathophysiology, clinical importance, and management. Anesth Analg 108:422–433
Brown ML, Abel MD, Click RL, Morford RG, Dearani JA, Sundt TM, Orszulak TA, Schaff HV (2007) Systolic anterior motion after mitral valve repair: is surgical intervention necessary? J Thorac Cardiovasc Surg 133:136–143
Crescenzi G, Landoni G, Zangrillo A, Guarracino F, Rosica C, La Canna G, Alfieri O (2009) Management and decision-making strategy for systolic anterior motion after mitral valve repair. J Thorac Cardiovasc Surg 137:320–325
Varghese R, Anyanwu AC, Itagaki S, Milla F, Castillo J, Adams DH (2012) Management of systolic anterior motion after mitral valve repair: an algorithm. J Thorac Cardiovasc Surg 143:S2–S7
Kuperstein R, Spiegelstein D, Rotem G, Stein M, Kogan A, Sternik L, Raanani E (2015) Late clinical outcome of transient intraoperative systolic anterior motion post mitral valve repair. J Thorac Cardiovasc Surg 149:471–476
Haddad F, Doyle R, Murphy DJ, Hunt SA (2008) Right ventricular function in cardiovascular disease, part II: pathophysiology, clinical importance, and management of right ventricular failure. Circulation 117:1717–1731
Expert Round Table on Ultrasound in ICU (2011) International expert statement on training standards for critical care ultrasonography. Intensive Care Med 37:1077–1083
Expert Round Table on Echocardiography in ICU (2014) International consensus statement on training standards for advanced critical care echocardiography. Intensive Care Med 40:654–666
Levitov A, Frankel HL, Blaivas M, Kirkpatrick AW, Su E, Evans D, Summerfield DT, Slonim A, Breitkreutz R, Price S, McLaughlin M, Marik PE, ElBarbary M (2016) Guidelines for the appropriate use of bedside general and cardiac ultrasonography in the evaluation of critically ill patients-part II: cardiac ultrasonography. Crit Care Med 44:1206–1227
American Society of Anesthesiologists and Society of Cardiovascular Anesthesiologists Task Force on Transesophageal Echocardiography (2010) Practice guidelines for perioperative transesophageal echocardiography. An updated report by the American Society of Anesthesiologists and the Society of Cardiovascular Anesthesiologists Task Force on Transesophageal Echocardiography. Anesthesiology 112:1084–1096
Mayo PH, Narasimhan M, Koenig S (2015) Critical care transesophageal echocardiography. Chest 148:1323–1332
Mayo P, Mekontso Dessap A, Dessap AM, Vieillard-Baron A (2015) Myths about critical care echocardiography: the ten false beliefs that intensivists should understand. Intensive Care Med 41:1103–1106
Vignon P, Merz TM, Vieillard-Baron A (2017) Ten reasons for performing hemodynamic monitoring using transesophageal echocardiography. Intensive Care Med 43:1048–1051
Jelacic S, Bowdle A, Togashi K, VonHomeyer P (2013) The use of TEE simulation in teaching basic echocardiography skills to senior anesthesiology residents. J Cardiothorac Vasc Anesth 27:670–675
YS performed ultrasound imaging, conducted the literature review, and wrote the manuscript. TN reviewed and edited the manuscript. MN, JI, NS, and KF reviewed and commented on the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Written informed consent was obtained from the patient for publication of this report and any accompanying images.
This report did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.