Intra-aortic balloon pump

Andrew Murphy and A.Prof Frank Gaillard et al.

Intra-aortic balloon pumps (IABP) are used in the intensive care setting to provide haemodynamic assistance to patients in cardiogenic shock.

The device is comprised of a catheter introduced via a femoral artery sheath, which extends retrogradely to the proximal descending thoracic aorta. A balloon is located at the end of the catheter, spanning 26-28 cm in length, which is rapidly inflated at the beginning of diastole and rapidly deflated at the end of diastole. The balloon is inflated with helium.

As the balloon forcibly inflates it displaces blood both forwards and backwards, known as diastolic augmentation. As such it provides not only additional forward momentum to the blood in the distal descending aorta but more importantly increases perfusion to the vessels arising from the aortic arch and ascending aorta, most importantly the coronary arteries which are perfused primarily during diastole 1,2.

This has a dual effect: it firstly decreases left ventricular afterload through a vacuum effect, decreasing myocardial oxygen requirements, and secondly increases myocardial perfusion (during diastole) 1,2.

Some catheters are radiolucent except for a distal radio-opaque marker. If the film is obtained during diastole then the balloon can be seen as a radiolucent oblong aligned with the thoracic aorta 1.

The balloon should be located in the proximal descending aorta, just below the origin of the left subclavian artery. This ideally results in the balloon terminating just above the splanchnic vessels 3.

Complications may occur in around 30% of cases 4 can be divided into those relating to balloon function and those related to balloon positioning.

  • mal-positioning: considered commonest complication
    • aortic dissection (1%) 4 or large vessel arterial dissection during insertion
    • obstruction of the left subclavian artery or renal arteries
  • function
    • platelet and red blood cell destruction
    • distal embolisation (this can be to the brain if positioning is too proximal), including from thrombosis at the insertion site or from helium embolus in the case of balloon rupture 5

Additionally, the catheter is quite large and the resultant common femoral artery defect can be difficult to close with routine compression. False aneurysm formation may thus occur.

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Article information

rID: 22403
Synonyms or Alternate Spellings:
  • Intra-aortic balloon pump (IABP)
  • IABP
  • Intra-aortic counterpulsation balloon
  • Intra-aortic balloon pumps
  • IABP's
  • Intra aortic balloon pumps

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