IABP

There’s always a good reason to review the physiology and reasons for placement of an Intra Aortic Balloon Pump (IABP).  We come across these a couple of times a month in our cardiac patients.  They’re a great temporary measure to stabilizing and treating the patient.

Contemporary Clinical Niche for Intra-Aortic Balloon Counterpulsation in Perioperative Cardiovascular Practice: An Evidence-Based Review for the Cardiovascular Anesthesiologist. JCVA, February 2017. Volume 31, Issue 1, Pages 309–320.

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From JCVA, Feb 2017.

One of the best explanations that I have ever seen for the IABP is from Dr. Rishi Kumar.  He’s a board certified anesthesiologist and is ICU fellowship trained and is pursuing a cardiac anesthesia fellowship as well.  This lovely human is no joke.  I’ve read his blog and his instagram posts, and he’s a wonderful teacher and mentor to those he reaches.  Please click his link for an entry regarding IABPs on his blog.

RKMD.com: Intra-Aortic Balloon Pump, Arterial Line, and EKG Waveforms. April 2018.

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TEE for placement of IABP

Anesthesia & Analgesia, July 2011. Vol 113, No. 1.

  • Want the tip 1-2 cm from left subclavian artery (LSCA)
  • X-plane aortic arch down to descending aorta to see the left subclavian artery
  • Visible during systole when the IABP balloon is deflated

Good visualization of the LSCA

A Novel Technique for Intra-aortic Balloon Positioning in the Intensive Care Unit.  J Extra Corpor Technol. 2012 Sep; 44(3): 160–162.

 

Cardiac anesthesiologists and LVAD patients: Pro vs Cons

There’s been a big debate re: who should care for LVAD patients… a general anesthesiologist or a cardiac anesthesiologist?  See below for pros and cons of each.  Ultimately, I think all anesthesiologists should be comfortable caring for these patients as we’ll see more and more LVAD patients undergoing procedures.

Troubleshooting the Left Ventricular Assist Device.  Emergency Medicine. 2016 February;48(2):58-63.

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From Emergency Medicine, Feb 2016.
LVAD Parameter Abnormalities:
  • High power, low-pulsatility index and fluctuating pump speed: Consider pump thrombosis or hypotension, vasodilation, initial response to exercise.
  • High power with high pulsatility index: Consider fluid overload, normal physiological response to increased demand; myocardial recovery.
  • Low power, low pulsatility index, and unchanging speed: Consider hypertension or inflow/outflow obstruction, LV failure, dysrhythmia.
  • Low power with normal or high pulsatility index: Consider suction event.

Pro: Cardiothoracic Anesthesiologists Should Provide Anesthetic Care for Patients With Ventricular Assist Devices Undergoing Noncardiac Surgery. JCVA, February 2017. Volume 31, Issue 1, Pages 378–381

Con: Cardiothoracic Anesthesiologists Are Not Necessary for the Management of Patients With Ventricular Assist Devices Undergoing Noncardiac Surgery. JCVA, February 2017. Volume 31, Issue 1, Pages 382–387.


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From LifeInTheFastLane.com

Ventricular assist devices and non-cardiac surgery.  BMC Anesthesiology201515:185

  • Goals of care for LVAD patients undergoing non-cardiac surgery should be directed at maintaining forward flow and adequate perfusion. Three main factors that affect LVAD flow are preload, RV function, and afterload.
  • The right ventricle is the primary means of LVAD filling; therefore, maintaining RV function is imperative.
  • Marked increases in systemic vascular resistance should be avoided.
  • Generally, decreases in pump flow should first be treated with a fluid challenge. Hypovolemia should be avoided and intraoperative losses should be replaced aggressively. Second line treatment should include inotropic support for the right ventricle.
  • Low-dose vasopressin (<2.4 U/h) may be the vasopressor of choice due to its minimal effect on pulmonary vascular resistance.
  • Standard Advanced Cardiovascular Life Support Guidelines should be followed; however, external chest compressions should be avoided during cardiac arrest.
  • Steep Trendelenburg may increase venous return, risking RV strain. Peritoneal insufflation for laparoscopic surgery also increases afterload and has detrimental effects on preload.  Insufflation should utilize minimum pressures and be increased in a gradual, step-wise fashion.
  • TEE can be extremely valuable in diagnosing the cause of obstruction.

Perioperative management of patients with left ventricular assist devices undergoing noncardiac surgery. Annals of cardiac anaesthesia 2016. Vol 19, Issue 4: 676-686.

LVAD: What Should I report? Feb 2017 ASE conference. **ECHO**

  • Higher the RPMs (pump speed)
    • More LV compression, smaller LV size
    • Less functional MR
    • More AI, less AV opening
    • Less LVED diameter
  • De Novo Aortic Regurgitation Post LVAD
    • Proposed mechanisms
      • Aortic valve remains closed during systole
      • Commissural fusion of the aortic valve from disuse
      • Subsequent degeneration of valve
      • Turbulent blood backflow from small outflow cannula onto a closed valve
      • Persistent elevation of aortic root pressure –> aortic root dilation and valve incompetence
    • Treatment
      • Lower LVAD speed (but that may worsen mitral regurgitation)
      • Aortic valve surgery or percutaneous intervention
      • Heart transplant
  • RV Fractional Area Change (RV FAC)
    • RVFAC is a rough measure of RV systolic function (4 chamber view)
    • RVFAC = (RVEDA – RVESA) / RVEDA
    • Normal RVFAC = 35 – 63%

Ventricular Assist Device (VAD). LifeInTheFastLane.com. .

Care of the LVAD patient PPT. Summit 2014.

  • Pulsatility Index:
    • —normally decrease as pump speed is increased

LVAD: Understanding equipment and Alarms. Duke Heart Center PPT.

LVAD Management in the ICU. Crit Care Med 2014; 42:158–168. 

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From Left Ventricular Assist Device Management in the ICU Pratt, Alexandra K. MD1; Shah, Nimesh S. MD1; Boyce, Steven W. MD2 Critical Care Medicine: January 2014 – Volume 42 – Issue 1 – p 158–168 doi: 10.1097/01.ccm.0000435675.91305.76 Concise Definitive Review
Screen Shot 2018-11-26 at 11.20.47 AM
Left Ventricular Assist Device Management in the ICU Pratt, Alexandra K. MD1; Shah, Nimesh S. MD1; Boyce, Steven W. MD2 Critical Care Medicine: January 2014 – Volume 42 – Issue 1 – p 158–168 doi: 10.1097/01.ccm.0000435675.91305.76 Concise Definitive Review

 

Anesthesia for Left Ventricular Assist Device Insertion: A Case Series and Review. Ochsner J. 2011 Spring; 11(1): 70–77.

Medical Management of Patients With Continuous-Flow Left Ventricular Assist Devices. Curr Treat Options Cardiovasc Med. 2014 Feb; 16(2): 283.

 


My blog posts:

HeartWare vs. HeartMate LVAD

Ventricular Assist Devices: Impella

Transcatheter Mitral Valve Replacement

Our hospital will be partaking in the Medtronic APOLLO study.

The data so far from other hospitals in an easy to read format.

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PPT from Duke 2017

Peri-procedural imaging for transcatheter mitral valve replacement. Cardiovasc Diagn Ther. 2016 Apr; 6(2): 144–159.

Role of echocardiography for catheter-based management of valvular heart disease. Journal of Cardiology 69 (2017) 66–73.

EAE/ASE Recommendations for the Use of Echocardiography in New Transcatheter Interventions for Valvular Heart Disease.  J ASE Sept 2011.

Multimodality Imaging in the Context of Transcatheter Mitral Valve Replacement. JACC: CARDIOVASCULAR IMAGING, VOL. 8, NO. 10, 2015.

Echo in mitral valve intervention. ESC 2012.

Mitral Valve Morphology Assessment: Three-Dimensional Transesophageal Echocardiography Versus Computed Tomography. Ann Thorac Surg 2010;90:1922–9.

Transcatheter Mitral Valve Replacement for Patients With Symptomatic Mitral Regurgitation. JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY VOL. 69, NO. 4, 2017. 

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Transcatheter Mitral Valve Intervention, An Issue of Interventional Cardiology Clinics, E-Book.

Quantification of Mitral Valve Morphology With Three-Dimensional Echocardiography.  Can Measurement Lead to Better Management? Circulation Journal Official Journal of the Japanese Circulation Society http://www.j-circ.or.jp. 2014.

Transcatheter valve replacement and valve repair: Review of procedures and intraprocedural echocardiographic imaging. Circ Res. 2016;119:341-356.

Philips: TMVR

Guidelines for Performing a Comprehensive Transesophageal Echocardiographic Examination: Recommendations from the American Society of Echocardiography and the Society of Cardiovascular Anesthesiologists. J Am Soc Echocardiogr 2013;26:921-64.

Transcatheter Mitral Valve Repair. Summer 2014Volume 19, Issue 2, Pages 219–237.

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Mitraclip and TEE for MR

 

Transthoracic Echocardiography (TTE)

Transthoracic echo: a beginner’s guide #tte #cardiac #echo #meded

Knowing how to do a quick focused echo exam can be instrumental in diagnosis as well as treatment.  This has helped me determine how severe cardiac tamponade has been in an emergent case prior to induction when there was no prior echo.  There are so many more useful answers that a bedside echo can provide.  Time to get acquainted.

Helpful links:

acoustic_windows
From Visible Heart Lab

Helpful articles:

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From ClinicalGate.com

MitraClip and TEE for MR

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European Heart Journal – Cardiovascular Imaging (2013) 14, 935–949.  Peri-interventional echo assessment for the MitraClip procedure. 

Everest Clinical Trial results PPT

Open Heart 2014;1:e000056. Two-year outcomes after percutaneous mitral valve repair with the MitraClip system: durability of the procedure and predictors of outcome.

ASE Echo 2016: Percutaneous approaches to MR. UofMichigan PPT.

2015: The role of 3D TEE in the MitraClip procedure – UofColorado PPT

Abbott TTE checklist for MitraClip

EuroValve Congress 2015: MR in the MitraClip Era

2012: Echo in mitral valve intervention. 

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Abbott MitraClip device and delivery system package insert

Neth Heart J (2017) 25:125–130. MitraClip step by step; how to simplify the procedure.

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Transseptal Puncture technique with TEE

JACC Cardiovascular Imaging: July 2012. Role of echo in percutaneous mitral valve interventions. 

MitraClip Cases with TEE: Mayo Clinic.

Ventricular Assist Devices: Impella

“There’s an emergent case coming for impella placement.”

Impella?  I’ve read about these devices and I’m familiar with managing patients on LVADs as well as providing anesthesia for LVAD placement.  But, I’ve never done an Impella on a critically unstable patient.

YouTube video describing the purpose and placement of the Impella

Cath Lab Digest: Overview of Impella 5.0

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Anesthesia & Analgesia; January 2012. Echo rounds: The Use of TEE for Confirmation of Appropriate Impella 5.0 Device Placement.

From A&A Echo Rounds

 YouTube video similar to our axillary artery conduit (we had to go left sided bc of a prior AICD in the patient’s right chest) for Impella 5.0

JCVA, June 2010. Review Articles: Percutaneous LVAD: Clinical Uses, Future Applications, and Anesthetic Considerations.

Minimally invasive mitral valve surgery from an anesthesiologist’s perspective. #cardiac #mitral #tee #minimallyinvasive #robot #anesthesia #meded

Surgically, more and more cases are performed through tiny incisions for minimal scarring.  Don’t let that underestimate the size of the procedure.  For example, mitral valve surgery is still a common procedure that involves a sternotomy (“cracking the chest”) and stopping the heart — it’s a big procedure.  However, surgeons have become adept at making smaller incisions while still undergoing the big procedure.

Innovations; 2011: Vol 6, No. 2.  Minimally invasive vs. Conventional open mitral valve surgery: A meta-analysis and systematic review.

Robotic mitral valve repair: anatomic considerations

Journal of Heart Valve Disease: August 2006. 2D Echo measurements alone do not provide accurate non-invasive selection of annuloplasty band size for robotic mitral valve repair

Annals of Cardiothoracic Surgery: 2013;2(6): 796-802. Value of TEE guidance in minimally invasive mitral valve surgery.

Multimedia-Manual of Cardiothoracic Surgery: Vol 2009; Issue 0122. Minimally invasive mitral valve surgery via right minithoracotomy

Cardiac Anesthesia: Principles and Clinical Practice; Chapter 25: Anesthesia for minimally invasive cardiac surgery.

Mitral Valve Repair Center: Post-Repair TEE Assessment.

Medtronic: Echo and surgical techniques for retrograde cardioplegia-coronary sinus cannulation during minimally invasive cardiac valve surgery.

OA Anaesthetics; 2014 Feb 25;2(1):3. Anaesthetics considerations for robotic-assisted cardiac surgery.

A modified anaesthesia protocol for patients undergoing minimally invasive cardiac surgery by thoracotomy – a single center experience.

HSR Proceedings in Intensive Care and Cardiovascular Anesthesia; 2013. Current concepts for minimally invasive mitral valve repair.

2014 Clinical vignette from the surgical prospective

Chauhan S, Sukesan S. Anesthesia for robotic cardiac surgery: An amalgam of technology and skill. Ann Card Anaesth [serial online] 2010 [cited 2016 Apr 12];13:169-75. Available from: http://www.annals.in/text.asp?2010/13/2/169/62947