Evaluation of Pain Intensity During Bone Marrow Biopsy Performed With Inhalation of Pre-Mixed 50 Per Cent Nitrous Oxide and Oxygen Mixture.

A Randomized Placebo-Controlled Double Blind Trial Comparing Pre-Mixed 50 Per Cent Nitrous Oxide and Oxygen Mixture in Combination With Local Local 1% Xylocaine Anesthetic Versus Placebo in Order to Evaluate Pain Intensity During Bone Marrow Biopsy.

Status

Terminated

Phases

Phase 3

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00219713

Enrollment

280

Registered

2005-09-22

Start date

2000-03-31

Completion date

2004-12-31

Last updated

2005-09-22

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Pain

Keywords

Nitrous oxide and oxygen, Pain, Bone marrow biopsy, Bone marrow aspiration

Brief summary

Bone marrow biopsy is a painful medical procedure often performed with local anesthetic. Therefore a double-blind, randomized, controlled trial was carried out in 330 adult patients who where referred for bone marrow biopsy and aspiration. 164 were assigned to inhale an equimolar mixture of nitrous oxide and oxygen and 166 to inhale a placebo. Pain measurement used visual-analogue pain scales, which involve rating the intensity of pain on a horizontal ruler

Detailed description

The efficacy of an inhaled equimolar mixture of nitrous oxide and oxygen to prevent procedural pain during lumbar puncture in children has been demonstrated. In adults the use of an inhaled equimolar mixture could prevent pain. Although nitrous oxide was initially considered innocuous, evidence began to be gathered later that it had potentially side effect. It has been demonstrated that nitrous oxide inactivates the vitamin B12-dependent enzyme methionine synthetase and impairs DNA synthesis in bone marrow cells. Therefore this prospective, multicenter randomized placebo controlled, double-blind trial was design to determine whether an inhaled equimolar mixture of nitrous oxide and oxygen would significantly reduce pain during bone marrow biopsy with aspiration. In addition we performed a careful cytological examination of bone marrow samples in order to evaluate the quality of the picture sample.

Interventions

DRUGnitrous oxide and oxygen

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

PREVENTION

Masking

DOUBLE

Eligibility

Sex/Gender

ALL

Age

16 Years to No maximum

Healthy volunteers

Inclusion criteria

* Patients 18 years of age or older * with a good clinical condition (score ECOG \< 2) * without contra indication for the use of nitrous oxide or previous medical history of allergy to Xylocaïne. * Informed consent signed up.

Exclusion criteria

* pregnancy, * prior exposure to nitrous oxide, * patients with neurological illness and those on anti depressant medications or with congestive heart failure or significant respiratory disease. * patients on analgesia for other medical conditions or whose with the inability to provided consent of an assessment of pain. * patients with platelet dysfunction or related coagulation disorders, aspirin or warfarin therapy

Design outcomes

Primary

Measure	Time frame
Reduce pain during bone marrow biopsy with aspiration.	—

Secondary

Measure	Time frame
Tolerability	—
Evaluation of the quality of the picture sample	—

Countries

France

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026