Has anyone ever inserted an Intra-Aortic Balloon Pump emergently in the ED... or anywhere else for that matter (CCU, OR, etc). How do you do it? Any advice or tips/tricks? What good resources are there for reading about the procedure? It's not listed in Roberts and Hedges.
Insertion
1. heparinise patient prior to insertion of catheter providing there are no contraindications such as recent surgery. After cardiac surgery patient should be given low-molecular weight dextran at 20 ml/hr instead of heparin. (Do not exceed total daily dose of 10 ml/kg)
2. prep skin
3. fully collapse balloon applying 30 ml vacuum with 60 ml syringe
4. insert needle into femoral artery at 45° and pass it through both walls of artery. Withdraw needle until strong pulsatile jet of blood is obtained
5. pass guidewire through needle and advance until tip is is in thoracic aorta. Wire should pass very easily
6. pass sheath over wire in similar manner to insertion of PA catheter sheath
7. pass balloon over guidewire through sheath. Must be inserted to at least the level of the manufacturers mark (usually double line) to ensure that entire balloon has emerged from sheath
8. balloon should be positioned so that the tip is about 1 cm distal to the origin of the left subclavian artery. If fluroscopy is not available during insertion the distance from the angle of Louis down to the umbilicus and then to the femoral artery insertion site should be measured to approximate the distance the balloon should be advanced and the position should be checked on CXR
9. remove wire. Return of blood via central lumen confirms that the tip is not subintimal and has not caused a dissection.
10. flush central lumen with heparin saline and connect to transducer to monitor intra-aortic pressure
11. monitor Doppler ankle pressures and compare with preinsertion value
Balloon pump timing
* using central aortic pressure waveform and ECG identify dicrotic notch (aortic valve closure)
* determine time delay between R wave and aortic valve opening and closure and enter these values into the pump
* turn on pump and compare assisted and unassisted waveforms to determine whether timing is optimal (figure 1)
* if inflation is too early or deflation too late the balloon waveform is superimposed to varying degrees over the LV systolic component of the central aortic pressure waveform (ie inflation starts when the aortic valve is still open). This results in an increase in afterload which may result in premature valve closure and increase LV work. Also, ventricular emptying is incomplete, stroke volume decreased, cardiac output decreased and myocardial oxygen demand increased. In addition, can increase shunting in patients with a septal defect
* if inflation is too late or deflation is too early diastolic augmentation is suboptimal
* balloon inflation can be triggered by R wave, arterial waveform or pacing spike. Latter is a potentially lethal mode as loss of capture may result in balloon inflation during systole as the pump will continue to follow the pacing rate rather than the ventricular contraction rate