Mitral Valve analysis

Review article: TEE of Mitral Valve. International Journal of Perioperative Ultrasound and Applied Technologies, September-December 2013;2(3):122-130.

New Concepts for Mitral Valve Imaging.  . 2013 Nov; 2(6): 787–795.

A Quantification Approach to Echocardiography of Mitral Valve for Repair. Anesthesia & Analgesia 12(1):34-58 · July 2015

4D-transesophageal echocardiography and emerging imaging modalities for guiding mitral valve repair.  Ann Cardiothorac Surg 2015;4(5):461-462.

Method—Comparison of Transthoracic and Transesophageal Echocardiography. Clin. Cardiol. 25, 517–524 (2002)

Virtual TEE: spectral Mitral valve

Echocardiographic atlas of the mitral regurgitation. J Saudi Heart Assoc. 2011 Jul; 23(3): 163–170.

Intraoperative transesophageal echocardiographic assessment of the mitral valve repair. Ann Card Anaesth 2010;13:79-85.

 
 
 

Computer-based comparison of different methods for selecting mitral annuloplasty ring size. Journal of Cardiothoracic Surgeryvolume 12, Article number: 8 (2017)

Prediction of the annuloplasty ring size in patients undergoing mitral valve repair using real-time three-dimensional transoesophageal echocardiography. . 2011 Jun; 12(6): 445–453.

 
 

The choice of mitral annuloplastic ring—beyond “surgeon’s preference”.  Ann Cardiothorac Surg 2015;4(3):261-265

Gold Standard to Measure MR – PPT 2016 U of Wash.

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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iabp-ekg-arterial-line-waveforms-aligned-600x559

 

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.


VAD-2
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. 

Screen Shot 2018-11-26 at 11.20.26 AM
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

MitraClip and TEE for MR

IMG_0056

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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IMG_0060

Transseptal Puncture technique with TEE

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

MitraClip Cases with TEE: Mayo Clinic.

Left Atrial Occlusion Devices

Our hospital is starting to do more left atrial occlusion devices for people who have afib and aren’t able to tolerate blood thinners. Currently, two types are offered by our cardiologists: Watchman procedure (endocardial) vs Lariat procedure (epicardial).

Lariat

It look and acts similar to a lariat or lasso.  An external guide wire with a magnet at its tip is introduced outside the heart towards the left atrial appendage (LAA). Another wire with a magnet at its tip is introduced from a groin vein and it traverses the interatrial septum to sit at the most distal point inside the LAA. The magnets “connect” and the lariat is introduced along the external guide wire and essentially lassos the LAA.

Lariat procedure
Watchman

A large occlusion device is inserted via a groin vein and traverses the interatrial septum into the proximal (base or largest opening) left atrial appendage. The device gets deployed and successfully occludes the LAA.

Watchman

PPT on Watchman from Boston Scientific

Is one better than the other?

Endocardial (Watchman) vs epicardial (Lariat) left atrial appendage exclusion devices: Understanding the differences in the location and type of leaks and their clinical implications.  Pillarisetti J, et al. Heart Rhythm. 2015.

CONCLUSION: The Lariat device is associated with a lower rate of leaks at 1 year as compared with the Watchman device, with no difference in rates of cerebrovascular accident. There was no correlation between the presence of residual leak and the occurrence of cerebrovascular accident.

Anesthesia

For these cases, we typically have a good flowing peripheral IV and intubate these patients for general anesthesia. There’s a fair amount of TEE required for placement and verification of correct positioning of the device. Both procedures require transseptal access. Watch for hypotension as there is a risk for pericardial effusion.

TEE for Lariat

TEE for Lariat


TEE for Watchman

Watchman TEE

Echo Essentials for Endoluminal LAA Closure: April 2014 Cardiac Interventions Today

The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation: J Vis Exp. 2012; (60): 3671

Anesthesia and Transesophageal Echocardiography for WATCHMAN Device Implantation: December 2016Volume 30, Issue 6, Pages 1685–1692.

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From JACC: Cardiovascular Interventions
PDF Article

Percutaneous Left Atrial Appendage Closure
Procedural Techniques and Outcomes

3D Echo inside the Cath Lab – A must in LAA Closure. London, 2016.

ECHONOMY:Tools for Echocardiographic Calculations

YouTube: LEFT ATRIAL APPENDAGE CLOSURE PROCEDURE : Role of Transesophageal Echocardiography

YouTube: TCTAP 2015 SHD Live Case Session: LAA Closure

YouTube: How to image the inter-atrial septum using 3D-TEE “RATLe-90 maneuver”

YouTube: TOE in LA Appendage Assessment by Jason Sharp

**ASEcho.org 2017**

WATCHMAN:
 
Baseline TEE:
·       Full Scripps TEE protocol
·       Measure the LAA at the following views:
o   0°, 45°, 90°, 135°
·       Report the LAA maximal orifice, as well as the LAA dimensions at each angle using the following Xcelera drop-downs under “Left Atrium”:
 
·       Comment on presence or absence of atrial thrombus or “smoke”
·       Optional: Comment on LAA shape (ie: cauliflower, chicken wing, windsock, cactus)
 

 

Intra-Procedural TEE:
·       Comment on presence or absence of atrial thrombus

·       Report the LAA maximal orifice using the following Xcelera drop-down under “Left Atrium”:

·       Enter LAA device size and implantation date under the “History” section in Xcelera
·       Comment on the presence or absence of a residual leak using the following Xcelera drop-down under “Left Atrium”:
 
·       If a residual leak is present, comment on the size (mm) of the leak using the following Xcelera drop-down under “Left Atrium”:
 
·       Iatrogenic ASD with direction of shunting
·       Comment on any post-procedure pericardial effusion (compare to baseline)

 

 
Post-Procedure Discharge TTE (pt. in hospital):
·       LIMITED 2D TTE to rule out pericardial effusion (unless order specifies otherwise)
·       Spectral Doppler for respirophasic flow changes if an effusion is present

 

 
45-Day, 6 Month, 1 year and 2 year F/U TEEs:
·       Comment on presence or absence of atrial thrombus
·       Comment on the presence or absence of a residual leak using the following Xcelera drop-down under “Left Atrium”:
 
·       If a residual leak is present, comment on the size (mm) of the leak using the following Xcelera drop-down under “Left Atrium”:
 
·       Carry over LAA device size and implantation date under the “History” section in Xcelera

·       Comment on Iatrogenic ASD with direction of shunting, if still present

When the bark is louder than the bite

In residency, you learn to deal with many different personalities.  This ranges from super sweet and helpful to utterly cruel and egotistical.  At MGH, our CA-3 year was spent running the call schedule on night call (the first-call experience).  It’s a terrific experience in prioritizing as well as organizing your team to prepare for what rolls through the OR doors.  Fast forward 4 years and now I’m in private practice.

While running the schedule on call, I get a call from the trauma surgeon saying a patient with an epidural hematoma needs to come to the OR emergently and couldn’t wait for another anesthesiologist to be called in from home (home call gives an anesthesiologist 30 minutes to come into the hospital for an emergency).  So, I made the executive decision to pull the anesthesiologist from the elective suboccipital craniotomy case to do the emergency.  It was a crani to crani and neuro to neuro switch… meaning the neuro team and crani trays were already open and ready to go.  It made the most sense in my mind.  Of course, without missing a beat, the “elective” neurosurgeon showed complete disdain of my decision.  To add fuel to the fire, he proceeded to berate the OR nurses, myself, and staff to make sure his displeasure was known.  I stood by my decision because it was the best decision for the emergency craniotomy patient who could have potentially died.  Secondly, I chose not to call in my final anesthesiologist for an elective case as we would have gone on “trauma bypass”.  This means that no traumas or emergencies could come to our hospital.  The “elective” neurosurgeon became more livid by the minute.  2.5 hours after he was supposed to start his case, I finished my first case and was able to get his case started.

Now, who does an elective suboccipital craniotomy for tumor case on a Saturday?  Secondly, he decides to do this in a sitting position — this has it’s own sets of risks.  He needed a precordial doppler, which our hospital did not have, so we called for it from our neighboring sister hospital.  In the meantime, I had another plan…that was to put down a TEE probe to monitor for venous air embolism (VAE).  After speaking to the patient and family, I proceeded to explain the risks/benefits of arterial line, central venous line, transesophageal echo, mechanical ventilation, blood transfusion, and intensive care unit stay.  It’s always a lot for the family to comprehend, especially while meeting them for the first time.  However, it is our job as anesthesiologists to make them comfortable and calm their fears.

**This picture taken from a google search for “precordial doppler”.  It is not my own.**

IndianJAnaesth_2012_56_5_502_103979_u2

**This picture taken from a google search for “precordial doppler”.  It is not my own.**

We get to the room and proceed with vital signs monitoring.  Uneventful induction and intubation.  A right internal jugular vein central venous line is placed (mainly to use as a Bunegin-Albin catheter).   TEE probe placed to look for air in RV and possibly air lock and RV failure –> VAE.  Radial arterial line placed and transduced at the level of the head.  Pt was placed in Mayfield pins and positioned in steep sitting position with reverse Trendelenberg and flexing the legs up.  Neuromonitoring commenced looking for changes in sensory and motor signaling.

All throughout the case, the TEE showed various amounts of air coming through the right side of the heart:

IMG_6787.PNGWith greater amounts of air, there would be a detectable decrease in blood pressure as well as end-tidal CO2.  While the right ventricle was still capable of pushing blood forward, I simply increased the blood pressure pharmacologically and increased the patient’s volume with normal saline from the IV.  Rarely does one get to see this TEE view as most of these cases are monitored non-invasively via pre-cordial doppler or ETCO2 and BP.

Lastly, this patient had a great outcome.  A 2cm x 2 cm hemangioma was resected with minimal disruption or trauma to surrounding tissue.  2 hours after a lengthy 4 hour surgery, the patient was sitting with their family… communicating and interacting with them.  All motor and sensory intact.

Pearls from this case:

1) Always do what is best for the patient.  When a life-and-death situation presents itself, it gets priority.  Period.  It doesn’t matter what pressure or temper tantrums you get from outside parties.  Make the best clinical decision. Organize a plan.  Stick with it.

2) Find out the surgeon’s plan.  This case was not booked in sitting position.  Some of these cases are done in prone position, which makes the likelihood of VAE significantly lower than in sitting position.  Knowing the surgeon’s plan of attack is critical to an anesthetic plan.

3) Read. Read. And read more.  Although I’ve been out of residency and fellowship for 4 years, cases will always test your knowledge as well as make you learn new skills/techniques to better your plan.  Take the time to do your best.  Always review.  Medicine is a lifelong learning career.

4) Don’t sweat the small stuff.  The “elective” neurosurgeon who raised such hell at the beginning of the case was thanking me for my help and expertise by the end of the case.  Learn as much as you can from your residency.  Take the knowledge gained and let your clinical acumen do the talking.  There is no room for ego when taking care of a patient.  Your ability to be well-read, well-trained, and well-respected will dictate the tone.  No fluff is needed when you bring 100% to the table.  Don’t be intimidated by the loud bark.