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Impact on Caesarean Rates following Injections of Sterile Water (ICARIS) – A randomised controlled trial.

For women in labour with backpain does the inclusion of sterile water injections with standard care reduce the rate of caesarean sections.

Status
Terminated
Phases
Unknown
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12611000221954
Acronym
ICARIS (Impact on CAesarean Rates following Injections of Sterile water)
Enrollment
1193
Registered
2011-02-28
Start date
2012-12-09
Completion date
2018-02-05
Last updated
2020-01-13

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

Conditions

None listed

Brief summary

We will test to see if the addition of sterile water injections for the relief of back pain in labour to standard pharmacological (nitrous oxide gas, narcotics, epidural) and non-pharmaclogical analgesic options ( shower, water immersion, massage, heat, aromatherapy, TENS) will affect birth outcomes, specifically the rates of caesarean section.

Interventions

Women with back pain during first stage labour, assessed by visual analogue scale as = 7 will receive 0.1 – 0.3 millilitres of sterile water for injection. The exact volume injected is determined by visualisation of the resulting blister or bleb by the administering clinician. The injection is given using of one-millilitre syringes and 23 gauge needles, one injection into four anatomical points surrounding the Michaelis rhomboid over the sacral area: two over the posterior superior iliac spines

Women with back pain during first stage labour, assessed by visual analogue scale as = 7 will receive 0.1 – 0.3 millilitres of sterile water for injection. The exact volume injected is determined by visualisation of the resulting blister or bleb by the administering clinician. The injection is given using of one-millilitre syringes and 23 gauge needles, one injection into four anatomical points surrounding the Michaelis rhomboid over the sacral area: two over the posterior superior iliac spines (PSIS) and the remaining two at two centimetres posterior, and one centimetre medial, to the PSIS respectively. Women may receive repeat injections upon request once the VAS is again = 7. Repeat injections will be of Sterile Water for injection. There is no maximum amount of injections that women may receive during their labour.

Sponsors

Mater Health Services
Lead SponsorHospital

Study design

Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Treatment
Masking
Blinded (masking used) (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
All
Age
18 Years to 50 Years
Healthy volunteers
Yes

Inclusion criteria

Term pregnancy (between 37 and 42 weeks gestation) Singleton pregnancy Cephalic presentation Back pain assessed by VAS as =7 when women request analgesia for backpain Able to give informed consent

Exclusion criteria

Multiple pregnancy Malpresentation (breech, transverse, shoulder) Back pain assessed by VAS < 7 when women request analgesia for backpain Any major complications that could cause problems with bleeding at the injection site eg. thrombocytopenia or any clotting abnormality. Standard exclusion criteria, based on clinical assessment to intradermal injections, will apply, including infection or inflammation involving the proposed injection sites.

Outcome results

None listed

Source: ANZCTR · Data processed: Mar 23, 2026