Tacrolimus Microsampling (VAMS)

Cincinnati Children's Hospital Medical Center

Status: Completed

Conditions: Validate Volumetric Absorptive Microsampling (VAMS) Assay

Treatments: Device: Mitra Microsampler

Study type: Interventional

Funder types: Other

Identifiers

NCT04810143

2019-0943

Details and patient eligibility

About

This is a feasibility study at a single site, Cincinnati Children's Hospital Medical Center. Patients who have undergone heart transplantation who meet eligibility requirements will be approached to participate in the study. The purpose of this study is to establish a reliable, home-based method for collecting samples as well as a standardized method for use of small-volume samples on both inpatients and outpatients.

Enrollment: 16 patients

Sex: All

Ages: 1 to 21 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Pediatric, adolescent, or young adult patients ≥1 and ≤21 years of age

   1. Aim 1: All patients presenting for routine post-transplant care including, but not limited to: cardiac catheterization, cardiac biopsy, inpatient admission, or outpatient visits
   2. Aim 2: outpatient

2. Currently taking tacrolimus

Exclusion criteria

1. Non-English-speaking patients
2. Unable to access overnight delivery services (Aim 2 only)

Trial design

Primary purpose: Device Feasibility

Allocation: Non-Randomized

Interventional model: Single Group Assignment

Masking: None (Open label)

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16 participants in 2 patient groups

Aim 1

Experimental group

Description:

All patients presenting for routine post-transplant care including, but not limited to: cardiac catheterization, cardiac biopsy, inpatient admission, or outpatient visits. A convenience sample of 25 inpatient samples will be collected for Aim 1. Although the assay developed by the MSCF will be validated for accuracy, the purpose of Aim 1 is to test "real world" application of the Mitra Microsampler tubes against the gold standard of blood collected by venipuncture in a controlled setting. To accomplish this, consecutive inpatient heart transplant patients will be enrolled. That sample will be collected at the same time (+/- 15 minutes) as a clinically-indicated, appropriately-timed venipuncture for measurement of a tacrolimus trough and prior to the subject taking tacrolimus so as to represent a trough.

Treatment:

Device: Mitra Microsampler

Aim 2

Experimental group

Description:

Outpatient. A convenience sample of 25 outpatients collecting 1-2 samples will be collected for Aim 2. For those who agree to participate, the parent/patient will be taught by a member of the team on how to use the Microsampler to collect blood from a finger stick. They will be provided with a kit for collection of up to 2 samples and will also be provided with appropriate shipping materials to return samples to CCHMC. Participants will then be instructed to collect a sample in the Mitra Microsampler via fingerstick. In addition to the process of collecting the sample in Aim 2, appropriately-aged participants and/or families will be asked to fill out a brief survey regarding sample collection. This will include questions about the ease or difficulty of performing the steps and tolerability of the procedure relative to past experiences with values obtained by venipuncture.

Treatment:

Device: Mitra Microsampler