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Medicine

The Intra-Aortic Balloon Pump

doi: 10.3791/62132 Published: February 5, 2021
Ganesh Gajanan1, Emmanouil S. Brilakis2, Jolanta M. Siller-Matula3,4,5, Ronald L. Zolty1, Poonam Velagapudi1

Abstract

Cardiogenic shock remains one of the most challenging clinical syndromes in modern medicine. Mechanical support is being increasingly used in the management of cardiogenic shock. Intra-aortic balloon pump (IABP) is one of the earliest and most widely used types of mechanical circulatory support. The device acts by external counterpulsation and uses systolic unloading and diastolic augmentation of aortic pressure to improve hemodynamics. Although IABP provides less hemodynamic support when compared with newer mechanical circulatory support devices, it can still be the mechanical support device of choice in appropriate situations because of its relative simplicity of insertion and removal, need for smaller size vascular access and better safety profile. In this review, we discuss the equipment, procedural and technical aspects, hemodynamic effects, indications, evidence, current status and recent advances in the use of IABP in cardiogenic shock.

Introduction

Cardiogenic shock is a clinical condition characterized by decreased end organ perfusion due to severe cardiac dysfunction. The most widely accepted definition of cardiogenic shock is based on the Should We Emergently Revascularize Occluded Coronaries for Cardiogenic Shock trial (SHOCK)1 and Intra-aortic Balloon Support for Myocardial Infarction with Cardiogenic Shock (IABP-SHOCK-II) trial2 and includes the following parameters:

1. Systolic blood pressure <90 mm Hg for ≥30 min or vasopressor and/or mechanical support to maintain SBP ≥90 mm Hg

2. Evidence of end-organ hypoperfusion (urine output <30 mL/h or cool extremities)

3. Hemodynamic criteria: cardiac index ≤2.2 L/min/m2 and pulmonary capillary wedge pressure ≥15 mm Hg

Acute myocardial infarction (AMI) is the most common cause of cardiogenic shock accounting for approximately 30% of cases3. Despite advances in the treatment of patients with AMI with early invasive revascularization, the mortality of cardiogenic shock remains high4. The mechanism of diastolic augmentation showing improvement in coronary perfusion and decreased left ventricular work was first demonstrated in 19585. Subsequently, in 1962 the first experimental prototype of IABP was developed6. Six years later, Kantrowitz et al.7 presented the first clinical experience of IABP use in four patients with AMI and cardiogenic shock unresponsive to medical therapy.

The IABP's mechanism of action involves inflation of the balloon during diastole and deflation during systole. This results in two important hemodynamic consequences: When the balloon inflates in diastole, the blood in the aorta is displaced proximally towards the aortic root thereby increasing coronary blood flow. When the balloon deflates in systole, it causes a vacuum or suction effect decreasing afterload and augmenting cardiac output8. The hemodynamic changes caused by IABP are listed below9 (Table 1):

1.Increase in aortic diastolic pressure

2.Decrease in systolic blood pressure

3.Increase in mean arterial pressure

4.Decrease in pulmonary capillary wedge pressure

5.Increase in cardiac output by ~20%

6.Increase in coronary blood flow10

The major indications of IABP are cardiogenic shock (due to AMI and other causes like ischemic and non-ischemic cardiomyopathy, myocarditis), mechanical complications of AMI like ventricular septal defect or severe mitral regurgitation, mechanical support during high risk percutaneous coronary interventions11, as a bridge to coronary artery bypass surgery in patients with critical CAD, inability to wean off cardiopulmonary bypass and as a bridge to decision or advanced therapies like left ventricular assist devices (LVAD) or cardiac transplantation in end stage heart failure12,13,14,15. Contraindications to use of IABP include moderate or severe aortic regurgitation which can worsen with counterpulsation, severe peripheral vascular disease which would preclude optimal arterial access and placement of the device and aortic pathologies like dissection12,15.

The IABP device consists of a console to control the unit and a vascular catheter with the balloon.

The console includes the following four components:

a) Monitor unit which helps to process and determine a trigger signal for the balloon. The signal can be either electrocardiographic (ECG) triggering or pressure signal triggering;

b) Control unit: Processes the trigger signal and activates the gas valve to help with inflation or deflation;

c) A gas cylinder that contains helium. Carbon dioxide is an alternative but is less preferred than helium. Helium has a lower density and provides better balloon inflation characteristics with more rapid inflation and deflation16;

d) A valve unit which helps with gas delivery.

The IABP (balloon) catheter is a 7-8.5 F vascular catheter with distance markings. The catheter has a polyethylene balloon mounted at the tip. The balloon size can vary from 20-50 mL. The ideal balloon has a length to cover from the left subclavian artery to the celiac artery take off, the inflated diameter measuring 90 to 95% of that of the descending aorta. The most commonly used balloon size in adult patients (height 5'4″/162 cm to 6'/182 cm) is 40 mL. A 50 mL balloon is used for patients >6'/182 cm and 34 cm balloon for 5'/152 cm to 5'4″/162 cm tall patients12,17 (Table 2).

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Protocol

This protocol follows the guidelines of institutional human research ethics committee.

1. Pre-insertion preparation

NOTE: The IABP is preferably inserted in the cardiac catheterization lab under fluoroscopic guidance. Bedside placement can be considered in very critical clinical situations.

  1. Begin by preparing the catheterization laboratory for the procedure. Prepare sterile drapes and chlorhexidine or povidone iodine, IABP control unit, IABP catheter, ultrasound for arterial access, 1% lidocaine for local anesthesia, micropuncture needle and wire, micropuncture sheath, 7-8.5 F arterial access sheath for the IABP depending on the balloon size or IABP manufacturer, sutures and sterile dressing.
  2. Prepare and drape the patient in the usual sterile fashion with a plan to access the femoral artery.
    ​NOTE: IABP can also be inserted through the axillary artery but this often requires a surgical cut down.
  3. Have the patient lay down flat on his or her back. Administer moderate conscious sedation if the clinical scenario permits, by infiltrating the groin access site liberally with 1% Lidocaine.
  4. Prepare the IABP catheter. Use a 50 mL syringe to apply a vacuum and completely deflate the balloon, using the one-way valve at the catheter hub.
  5. Remove the stylet in the catheter and manually flush the inner lumen with 3-5 mL of saline.

2. Insertion of the IABP

  1. Obtain arterial access using the Seldinger technique18. Use ultrasound guided vascular access to improve first pass success and minimize vascular complications.
  2. Insert a micropuncture needle at a 45˚ angle and insert the introducer wire once blood return is obtained.
  3. Insert the micropuncture sheath.
  4. Exchange the micropuncture sheath for a larger IABP sheath. The sheath size varies by manufacturers and balloon size but is usually 7-8.5 F.
    NOTE: There are two methods to introduce and advance the IABP catheter. The catheter can either be backloaded with a wire or can be advanced over a wire.
  5. Advance the IABP catheter through the sheath using short strokes until correct placement is achieved. The optimal balloon position is where the tip is situated distal to the left subclavian artery take off. This is often not easy to identify, and hence, use the carina of the trachea as a landmark, ensuring that the proximal end is above the renal arteries.
  6. Confirm position by fluoroscopy. Secure the catheter in place either by using sutures or manufacturer provided locking plates and apply sterile dressing.
    ​CAUTION: Incorrect balloon position results in reduced diastolic augmentation or vascular complications due to direct endovascular injury.

3. Switching on and setting up the IABP

  1. Remove the guidewire and aspirate 3 mL of blood from the inner lumen. Flush the inner lumen with 3-5 mL of saline.
  2. Attach a standard arterial pressure monitoring tubing to the catheter hub. Remove the one-way valve from the catheter and attach the catheter hub to the console using the provided extension catheter.
  3. Turn IABP On, then open the gas tank. Connect the ECG cable to the console. Connect the fiber optic or pressure cable to the console (depending on the manufacturer).
  4. Press the Start key on the console. This automatically purges and fills the balloon, calibrates, selects an appropriate ECG lead and trigger, and automatically sets the inflation and deflation timing.
    1. Select an appropriate operation mode - Automatic, Semi-automatic or Manual depending on the clinical scenario.
    2. Select a trigger source. The IABP uses a trigger to identify the beginning of the next cardiac cycle. It deflates the balloon when it recognizes a trigger event. Trigger can be either ECG (R wave) or pressure (systolic upstroke).
    3. Observe the pressure changes on the IABP console by setting a 1:2 frequency. Confirm that the assisted systolic pressure is lower than unassisted one, there is decrease in assisted end-diastolic pressure and that diastolic augmentation is above the systolic pressure - all of which is associated with optimal IABP support (Figure 1).
    4. Set appropriate IABP frequency which can be 1:1, 1:2 or 1:3. This represents the frequency of balloon inflation with each trigger.
    5. Confirm that the IABP timing is appropriate.
      NOTE: An ideal IABP timing consists of the following: a) Inflation occurring at the dicrotic notch which appears as a sharp "V". Ideally, the diastolic augmentation rises above systole, and b) Deflation occurring just prior to the next systole (Figure 1).
  5. Use a continuous flush through the inner lumen (usually 3 mL/h).
    NOTE: The patient and the IABP console are now ready to be transported.
  6. Use systemic anticoagulation to reduce the risk of arterial thromboembolism.
    ​NOTE: This is institution dependent and some centers do not use systemic anticoagulation for an IABP frequency of 1:119.

4. Assessment of the patient after placement of IABP

  1. Check distal pulses. If the left radial pulse is weak, verify the position of the balloon to make sure that it is not occluding the left subclavian artery. If no distal pulses are detected in the lower limb, consider removing the IABP and possibly alternate access.
  2. Check the insertion site for any bleeding or hematoma.
  3. Monitor urine output. If there is a drop in urine output or if there is a concern for hematuria, recheck balloon position to confirm that the balloon lies above the level of the renal arteries.
  4. If there is blood in the IABP tubing, suspect balloon rupture. Immediately stop the IABP (this is usually done automatically) and remove the catheter.
  5. Obtain a chest X-ray daily to verify optimal device positioning. Also change the sterile dressing daily to reduce the chances of infection.

5. Removal of IABP

  1. Stop systemic anticoagulation and set IABP to 1:1.
  2. Palpate the femoral pulse and check the baseline distal perfusion by obtaining a Doppler of the pedal pulse.
  3. Check the activated clotting time. It should ideally be less than 150-160 seconds.
  4. Remove sutures.
  5. Once ready to pull, press the Stop button on the IABP console screen.
  6. Pull the IABP until resistance is met against the sheath.
  7. Pull the sheath and IABP as a unit.
  8. Hold manual pressure over the femoral artery for 20-30 minutes or until bleeding stops.
  9. Reassess distal pulses with Doppler.
    NOTE: Manual pressure has been mentioned here in the protocol because it is universal. However, there are numerous other methods apart from manual pressure to help achieve femoral arterial hemostasis. These are institution dependent and include but are not limited to: external compression devices like FemoStop, vascular closure devices like Angioseal and Perclose ProGlide Suture-Mediated Closure System. The above-mentioned protocol was partly developed by using official device information guides and manuals across various manufactures of IABP.

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Representative Results

Despite being used for many decades now, the evidence on IABP use has been controversial. Routine use of IABP in patients with AMI and cardiogenic shock is not recommended. The previous guidelines of the American Heart Association/American College of Cardiology (AHA/ACC) and the European Society of Cardiology (ESC) strongly recommended the use of the IABP in patients with AMI-associated cardiogenic shock (Class I B and Class I C) on the basis of pathophysiological considerations, non-randomized trials and registry data. However, the AHA/ACC in 2013 downgraded the use of IABP to class II A, primarily based on the results of the IABP Shock II trial13. The ESC STEMI Guidelines 2017 recommended no routine IABP counterpulsation but the guidelines state that IABP may be considered for haemodynamic support in selected patients as those with severe mitral insufficiency or ventricular septal defect14. The ESC NSTE-ACS 2020 guidelines discourage form routine use of IABP in patients with CS (class IIIB) but recommend IABP in ACS-related mechanical complications (class IIA)20.

The IABP Shock II trial2, randomized 600 patients with acute MI complicated by cardiogenic shock to either IABP or no IABP. At 30 days, there were no differences in outcomes, including length of stay in the intensive care unit, renal function, rates of major bleeding, peripheral ischemic complications, sepsis, or stroke. There was no difference in mortality at long-term follow-up of 12 months and 6.2 years21.The major limitations of the trial were - the timing of insertion of IABP was not controlled (86.6% were inserted post PCI). A lower mortality rate compared to other studies precludes application of this study to severe cardiogenic shock. Subsequent meta-analyses have showed that there is no convincing randomized data to support the routine use of IABP in AMI related cardiogenic shock22.

However, several recent studies have shown that there is still some utility for the use of IABP. A meta-analysis of 9212 patients investigated the utility of the IABP when implanted preoperatively in patients undergoing coronary bypass graft surgery. The results support the use of IABP in this clinical setting, with a 4% relative risk reduction of mortality. Also, the risk of MI, renal failure, intensive care, and hospital length of stay were reduced with IABP23. Interestingly, with the increasing use of advanced heart failure therapies, IABP is being increasingly used in combination with extracorporeal membrane oxygenation and was associated with better survival in a recent meta-analysis24.

Structure Hemodynamic effect
Aorta ↓systolic pressure, ↑diastolic pressure
Left ventricle ↓systolic pressure, ↓end-diastolic pressure, ↓volume, ↓wall tension
Heart ↓afterload, ↓preload, ↑cardiac output
Coronaries ↑/unchanged coronary blood flow

Table 1: Hemodynamic effects of IABP

Company Product Catheter size (F) Sheath size (F) Balloon size (ml)
Balton IABC Balloon 7.5, 8 7.5, 8 20, 25, 30, 34, 40, 50
Getinge Cardiosave IABP 7, 7.5, 8 7.5,8 25, 30, 34, 40, 50
Getinge CS300 IABP 7, 7.5, 8 7.5,8 25, 30, 34, 40, 50
Getinge Linear 7.5 7.5 25, 34, 40
Getinge Mega 7.5, 8 7.5, 8 30, 40, 50
Getinge Sensation 7 7 34,40
Getinge Sensation Plus 7.5, 8 7.5,8 40,50
Teleflex Arrow AC3 Optimus Intra-Aortic Balloon Pump 7, 7.5, 8 8,8.5 30,40,50
Teleflex Arrow RediGuard IAB Catheters 7,8 8,8.5 30,40,50
Teleflex Arrow Ultra 8 Fiber-Optic IAB Catheters 8,8.5 8,8.5 30,40,50
Teleflex Arrow Ultra 8 Fluid-Filled IAB Catheters 8 8 30,40
Teleflex Arrow UltraFlex 7.5 IAB Catheters 7.5, 8 8,8.5 30,40,50

Table 2: Comparison of catheter and sheath sizes across different IABP manufacturers33

Problem Probable cause Solution
Console alarm - “check IABP Catheter” Kink in tubing Relieve kink
Incomplete unfolding of balloon membrane Manually inflate and deflate balloon
A part of the balloon is in the sheath Check balloon position
Rapid Gas Loss or Leak in IABP Circuit Possible rupture Check tubing for blood
If there is no blood in the tubing, double check the connections
Weak left radial pulse or left arm ischemia. Left subclavian artery occlusion Check position of IABP
Low urine output or hematuria Renal artery occlusion Check position of IABP
Excessive bleeding from insertion site Difficult arterial access, multiple sticks Apply firm pressure while ensuring distal flow
Limb ischemia Arterial access site issues, peripheral vascular disease Consider removing the IABP. Consider alternate access
Blood noted in catheter tubing Balloon rupture Stop the IABP and remove the catheter immediately
Arterial dissection Improper advancement of the guidewire with subsequent insertion of the IABP into a false lumen Remove IABP

Table 3: Troubleshooting of potential device malfunction and major patient complications from IABP

Figure 1
Figure 1: Hemodynamic waveform with IABP and appropriate timing of IABP augmentation Please click here to view a larger version of this figure.

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Discussion

Mechanical circulatory support is a rapidly evolving field. Even with the arrival of newer support devices, IABP remains the most widely used and simplest to deploy mechanical circulatory support device available currently25. In this article we describe in detail, the procedure for percutaneous insertion of IABP, the indications, evidence, troubleshooting and complications. Despite conflicting evidence regarding the use of IABP in AMI-related cardiogenic shock, it remains the most widely used form of mechanical support. In addition to use in AMI related cardiogenic shock IABP is also used in coronary artery bypass surgery and as a bridge to advanced heart failure therapies like LVAD or cardiac transplant.

Insertion of the IABP is straightforward and the technique can be rapidly deployed either at bedside or preferably in the cardiac catheterization laboratory where fluoroscopic guidance can be used to confirm positioning. We recommend using ultrasound guidance to obtain arterial access to improve first pass success and better safety profile26. The IABP wire can either be backloaded (advancing the balloon and wire together as a unit) or over the wire as mentioned above. However, in patients with known peripheral vascular disease, we recommend the "over the wire" method. This helps confirm whether it is possible to navigate the IABP catheter through a narrow or tortuous vasculature. In patients with risk factors for limb ischemia, sheathless insertion technique can be considered which reduces the risk of ischemic complications secondary to the vascular sheath27.

IABP is now being increasingly used in patients with end stage heart failure as a bridge to decision or advanced heart failure therapies like LVAD or cardiac transplant. A large study looking at the use of IABP in 1342 patients showed that IABP utilization increased over three fold since the 2018 cardiac transplant allocation change28. Since these patients often require mechanical support for a prolonged period of time, IABP insertion through the axillary artery can be considered. The axillary approach is well tolerated and permits ambulation and reduces the risk of infection in those requiring prolonged mechanical support. This overcomes the major limitation of the femoral approach which restricts ambulation and thereby promoting deconditioning in this tenuous patient population29. Newer devices which operate on the same principles as an IABP like the intravascular ventricular assist system (iVAS) are currently being studied which allow the patient to be discharged home with a temporary mechanical support device30.

Complications from IABP most commonly result from difficult arterial access, malposition and patient risk factors like peripheral vascular disease. Due to the endovascular nature of the device, the most common complications are primarily related to vascular injury. Other complications include cerebrovascular accident, thrombocytopenia, insertion site bleeding, aortic dissection, spinal cord ischemia, blood stream infections, balloon rupture and gas embolism11,27,31,32. Troubleshooting of the device and the common complications are summarized in Table 3.

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Disclosures

Ganesh Gajanan MD has no conflicts of interests to declare

Emmanouil S. Brilakis, MD, PhD has the following disclosures : Consulting/speaker honoraria from Abbott Vascular, American Heart Association (associate editor Circulation), Amgen, Biotronik, Boston Scientific, Cardiovascular Innovations Foundation (Board of Directors), ControlRad, CSI, Ebix, Elsevier, GE Healthcare, InfraRedx, Medtronic, Siemens, and Teleflex; research support from Regeneron and Siemens. Shareholder: MHI Ventures.

Jolanta M. Siller-Matula, MD, PhD has the following disclosures: Lecture or consultant fees from AstraZeneca, Daiichi-Sankyo, Eli Lilly, Bayer and research grant from Roche Diagnostics;

Ronald L. Zolty, MD, PhD has the following disclosures: Consultant for Actelion, Bayer, United Therapeutics and Alnhylam

Poonam Velagapudi MD has no conflicts of interests to declare.

Acknowledgments

None

Materials

Name Company Catalog Number Comments
IABP catheter and console Getinge Sensation Plus
Micropuncture Introducer Set Cook Medical G48006
Sterile drapes Haylard
Ultrasound GE
Lidocaine Pfizer

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References

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Cite this Article

Gajanan, G., Brilakis, E. S., Siller-Matula, J. M., Zolty, R. L., Velagapudi, P. The Intra-Aortic Balloon Pump. J. Vis. Exp. (168), e62132, doi:10.3791/62132 (2021).More

Gajanan, G., Brilakis, E. S., Siller-Matula, J. M., Zolty, R. L., Velagapudi, P. The Intra-Aortic Balloon Pump. J. Vis. Exp. (168), e62132, doi:10.3791/62132 (2021).

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