PubMed
intra-aortic balloon pump AND (axillary OR axillo-subclavian OR subclavian)
Includes several papers describing results in small series of patients undergoing this procedure. Outcomes reported include survival to intended endpoint of the bridge, mortality, device-related infections, bleeding, etc.  You can add terms for specific outcomes and/or specific patient populations to the search to focus your results.

AACN Procedure Manual for Critical Care, 6th ed., provides details on the procedure, equipment, outcomes, etc. It references this case report/review, which is included in the PubMed search above.
Heart Lung Circ. 2006 Apr;15(2):148-50.
Intraaortic balloon pump insertion through the subclavian artery. Subclavian artery insertion of IABP.  Marcu CB, Donohue TJ, Ferneini A, Ghantous AE

Note: The AACN Manual is available in print at the EUH Branch Library.

SEARCH METHODS
The results above were achieved by a search of DynaMed, Joanna Briggs, AACN Procedure Manual for Critical Care, and PubMed using combinations of these concepts:
intra-aortic balloon pump
axillary OR axillo-subclavian OR subclavian
clinical trials
complications OR outcomes

Neither DynaMed nor Joanna Briggs JBI had specifics on this method of the intraaortic balloon pump.

Reviewed by John Nemeth 4/14