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Updated: Apr 27, 2026
Simplified Intrafemoral Injections Using Live Mice Allow for Continuous Bone Marrow Analysis
Published on: November 10, 2023
Femoral micropuncture or routine introducer study (FEMORIS)
John A Ambrose1, Joel Lardizabal, Mouatou Mouanoutoua
1Division of Cardiology, Department of Internal Medicine, UCSF Fresno Medical Education Program, Fresno, Calif., USA.
Objectives:
The Micropuncture® 21-gauge needle may reduce complications related to vessel trauma from inadvertent venous or posterior arterial wall puncture.
Methods:
This was a single-center, multiple-user trial. Four hundred and two patients undergoing possible or definite percutaneous coronary intervention (PCI) were randomized 1:1 to an 18-gauge versus a 21-gauge needle. Patients and personnel pulling the sheaths and performing the follow-up were blinded. The primary end point was a composite of access bleeding. Events were tabulated following sheath removal, ≤ 24 h after the procedure and at the follow-up (at 1-2 weeks). End points were blindly adjudicated.
Results:
The event rate overall was 12.4% and did not differ significantly between groups, although the 21-gauge needle was found to reduce events by more than one third. An exploratory subgroup analysis of prespecified variables indicated that: patients who did not undergo PCI or elective procedures, female patients and those with a final sheath size of ≤ 6 Fr all had a significant or near-significant reduction of complications with Micropuncture.
Conclusions:
Although no significant differences between the use of the 18- and 21-gauge needles were observed, there was a 50-75% reduction with Micropuncture in several subgroups. The study was terminated prematurely. Access site complications may be reduced by the use of the 21-gauge needle, particularly when the risk of bleeding is not high. Further multicenter data will be required to confirm these hypothesis-generating observations.
