Non-Pharmacological Factors on Spinal Block Duration

June 4, 2026 updated by: Taksim Egitim ve Arastirma Hastanesi

Analysis of Non-pharmacological Factors on Spinal Anaesthesia Block Duration

The aim of this study is to evaluate the effects of non-pharmacological factors-such as age, sex, body mass index, paraspinal muscle mass, vertebral canal anatomy, patient positioning, and injection technique-on the duration of sensory and motor block in patients undergoing spinal anesthesia, and to investigate the potential relationships between these factors and block duration.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

It is well known that the level of sensory and motor block following spinal anesthesia varies among individuals. This variability is not only related to the dose of local anesthetic but has also been reported to be associated with patient-related non-pharmacological factors. In particular, a relationship has been demonstrated between body mass index (BMI) and both the level and duration of spinal block, with higher block levels and prolonged block duration observed in patients with increased BMI. This phenomenon is thought to be associated with epidural venous distension due to increased intra-abdominal pressure and a reduction in subarachnoid cerebrospinal fluid (CSF) volume. A decrease in CSF volume may facilitate greater cephalad spread of intrathecal local anesthetic agents, thereby prolonging block duration.

Paraspinal muscle mass is also an important anatomical parameter that may influence intra-abdominal pressure and epidural space compliance, and thus may play a determining role in the spread of spinal anesthesia. However, although several studies have investigated the relationship between BMI and body composition and spinal block characteristics, the number of clinical studies directly evaluating the association between ultrasonographically measured paraspinal muscle mass and spinal anesthesia block duration remains limited. Therefore, ultrasonographic measurement of paraspinal muscle thickness may serve as a potential predictor of spinal block duration.

Study Type

Observational

Enrollment (Estimated)

140

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Probability Sample

Study Population

Patients aged 18-80 years, male and female, classified as ASA physical status I-III, and scheduled for elective lower abdominal surgery.

Description

Inclusion Criteria:

  • Patients aged 18-80 years
  • ASA physical status I-III
  • Patients scheduled for elective lower abdominal surgery.

Exclusion Criteria:

  • Patient refusal to participate
  • Coagulopathy
  • Use of medications or substances known to impair coagulation
  • Pregnancy, sepsis
  • Shock
  • Severe aortic or mitral regurgitation
  • Peripheral vascular disease
  • Increased intracranial pressure
  • Mental disorders
  • Spinal column deformity
  • History of previous spinal surgery.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Paraspinal mass measurement with ultrasound.
Time Frame: Pre-operative
Ultrasonographic measurement of paraspinal muscle thickness (cm) and its association with duration of spinal block will be investigated.
Pre-operative

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
The spread of the spinal block
Time Frame: Perioperative/Periprocedural

The speed of the sensational block will be measured after spinal anaesthesia performed.

Time(minute) will be recorded when T10 level sensational block is achieved.
Perioperative/Periprocedural

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Taksim Egitim ve Arastirma Hastanesi

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 1, 2026

Primary Completion (Estimated)

December 1, 2026

Study Completion (Estimated)

December 15, 2026

Study Registration Dates

First Submitted

April 20, 2026

First Submitted That Met QC Criteria

June 4, 2026

First Posted (Actual)

June 10, 2026

Study Record Updates

Last Update Posted (Actual)

June 10, 2026

Last Update Submitted That Met QC Criteria

June 4, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2026.02.IRB.121

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

IPD Plan Description

All the statistical data will be shared if required

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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