Condition category
Not Applicable
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
This is done using a technique called microdosing, where the dose of the drug given is too small to cause whole-body effects, but large enough to allow researchers to see what happens to the drug inside the body. This includes how the body affects the drug, how the drug is absorbed and distributed, whether any chemical changes to the drug occurs and, finally, how the drug is removed, or excreted, from the body. All this is achieved with little risk of bad side effects, due to the dose being so low. Here, a method called microtracer dosing, where the drug midazolam is labelled with a tiny amount of radiation which is then measured by accelerator mass spectrometry (a technique that shows where the drug is inside the body, and what is happening to it) is used to find out the effects of this drug on newborn, infants and toddlers. The results of this analysis are then compared with information about this drug found though previous research using standard methods. This study could establish a way for accelerator mass spectrometry (AMS) studies to be used for developing new drugs for children, which will mean that such drugs can be given earlier than they are now.

Who can participate?
Babies and toddlers of either sex, between preterm up to 2 years, that have been admitted to hospital.

What does the study involve?
A single microdose of radioactive midazolam will be given either by mouth or injection through a vein. Blood will periodically be taken for testing of the drug and what happens to it once inside the body, over the next twelve hours. The maximum length of participation in the study is up to 48 hours after giving the study drug.

What are the possible benefits and risks of participating?
The participants will not gain any direct benefit. The benefits from this study are for other babies in the future as the information gathered in this study becomes available. The risks due to midazolam will be very small as this dose is less than a millionth of the dose normally given to newborn babies and infants. There are no anticipated safety issues relating to exposure to the radioactive drug.

Where is the study run from?
The study is run from the following sites:
1. Liverpool Women's NHS Foundation Trust, UK (lead centre)
2. Alder Hey Children's NHS Foundation Trust, UK

When is the study starting and how long is it expected to run for?
June 2014 to December 2014.

Who is funding the study?
ERA-NET PrioMedChild (Priority Medicines for Children), Netherlands.

Who is the main contact?
Dr Mark Turner

Trial website

Contact information



Primary contact

Dr Mark Turner


Contact details

Liverpool Women's NHS Foundation Trust
Crown Street
L8 7SS
United Kingdom
+44 (0) 151 795 9558

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

A multi-centre clinical study to evaluate the use of a microtrace dose of 14C-labelled midazolam and accelerator mass spectrometry (AMS) bioanalysis as new tools in drug development to determine pharmacokinetics in neonates, infants and toddlers


PAMS Midazolam

Study hypothesis

We hypothesize that 14C-labelled microdose midazolam has similar PK to "cold", standard, therapeutic midazolam

Ethics approval

North West REC Liverpool East, 15/04/2014, ref. 13/NW/0839

Study design

A multicentre observational open label study

Primary study design


Secondary study design

Non randomised controlled trial

Trial setting


Trial type


Patient information sheet


Medicines for Children; Paediatrics


1. A single 14C labelled microdose of midazolam will be administered IV or orally. The microdose will contain 111 Bq / kg 14C labelled midazolam. The 14C labelled microdose of midazolam will be presented as a sterile solution suitable for oral or intravenous administration.
2. Blood results taken for haematology, biochemistry and blood gas analysis that are required for clinical care. No haematology, biochemistry or blood gas studies samples will be taken for the purposes of this study. The most recent samples will be included in the data if they are taken 24 hours before the study drug in neonates and up to 3-7 days before the study drug for older infants:
2.1. Biochemistry: Plasma creatinine, Na+, K+ Cl, AST, ALT, alkaline phosphatase, total bilirubin, conjugated bilirubin, albumin, total calcium, corrected calcium, magnesium, Creactive protein.
2.2. Full blood count: Hgb, total white cell count, differential white cell count, MCV, MCH, MCHC and platelets.
2.3. Blood gas: pH, glucose, lactate, ionized calcium
3. In participants with urinary catheters in place the urine collection bag will be emptied immediately before the microdose is administered. Timed samples of urine will be collected for 48 hours after the microdose is administered.
4. DNA sampling will occur without any study specific blood samples. DNA will be obtained by one of the following methods depending on the clinical situation:
4.1. Buccal swab. A a standard swab is placed in the child's mouth and brushed against the skin on the inside of the cheek. The cells are extracted and used to extract DNA.
4.2. Cell samples from clinically indicated samples. Samples sent to the laboratory for clinical purposes are retained for quality control purposes and usually discarded. These samples can be pooled and used to extract cells and DNA.
4.3. Dried blood spots. If there is excess blood left after the research assays it can be used to extract cells and DNA.

Intervention type



Not Applicable

Drug names

Primary outcome measures

The primary outcome of the study will be a noncompartmental model of midazolam disposition.

Secondary outcome measures

The secondary outcome will be a population model of the whole dataset taking account of all the variables. Pharmacogenetic outcomes will relate continuous variables (midazolam or metabolism concentrations at steady state) with the presence of polymorphisms in CYP3A4

Overall trial start date


Overall trial end date


Reason abandoned


Participant inclusion criteria

1. Infants and toddlers from preterm neonates (32-36 GW at birth) up to 2 years
2. Having intravenous or intra-arterial access suitable for blood sampling
3. Written informed consent prior to any study-specific procedures
4. For dried blood spot sampling in addition to plasma, the participant must weigh more than 2.3 kg

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. History of allergy or hypersensitivity to midazolam
2. Serious hepatic and/or renal impairment defined as creatinine > 150 micromol or AST or ALT > 200
3. Be otherwise unsuitable for the study, in the opinion of the investigator
4. Extracorporeal membrane oxygenation (ECMO)
5. Haemofiltration, peritoneal dialysis, haemodialysis

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

Liverpool Women's NHS Foundation Trust
L8 7SS
United Kingdom

Sponsor information


Liverpool Women's NHS Foundation Trust (UK)

Sponsor details

Crown Street
L8 7SS
United Kingdom
+44 (0) 151 702 4241

Sponsor type

Hospital/treatment centre



Funder type

Research organisation

Funder name

ERA-NET PrioMedChild (Priority Medicines for Children) (Netherlands)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Results - basic reporting

Publication summary

Publication citations

Additional files

Editorial Notes