Infrared Thermography to Evaluate the Effect of Paravertebral Block

Huazhong University of Science and Technology

Status: Completed

Conditions: Paravertebral Block

Treatments: Procedure: Paravertebral block at T4 and T5 level

Study type: Observational

Funder types: Other

Identifiers

NCT04078347

TJ-IRB20190424

Details and patient eligibility

About

The aim of this prospective observational study was to evaluate the changes of skin temperature after the paravertebral block measured by infrared thermography.

Full description

Methods: Patients scheduled for elective surgery with paravertebral block will receive infrared thermography measures 5 min before the block and continous to 20 min after the block. The sensitivity, specificity of infrared thermography as diagnostic methods will be determined by receiver operator characteristic analysis.

Enrollment: 61 patients

Sex: All

Ages: 18 to 70 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• With informed consent
• American Society of Anesthesiologists physical status Ⅰ-Ⅱ
• Undergo elective surgery with planned paravertebral block

Exclusion criteria

• Refusal to participate in the study
• pre-existing infection at the block site
• younger than 18-yr-old
• BMI>35
• significant thoracic kyphoscoliosis
• Those who had taken vasodilatory drugs before surgery
• history of previous thoracic or breast surgery
• Preoperative analgesic medications
• Any contraindications to peripheral nerve block such as coagulation abnormalities, allergy to local anaesthetics, peripheral neuropathy.

Trial design

61 participants in 2 patient groups

Successful Paravertebral block

Description:

Pinprick test was evaluated at 20 min after Paravertebral block. Pinprick sensation was assessed using a 22-gauge short bevel needle from T2 to T10 at midclavicular line bilaterally . Pinprick response was recorded quantitatively as 1 (sensation) or 0 (no sensation/numb). Successful block was defined as the pinprick score was 0 at 20 min after block. Otherwise, it was defined as a failed block.

Treatment:

Procedure: Paravertebral block at T4 and T5 level

Failed Paravertebral block

Description:

Pinprick test was evaluated at 20 min after Paravertebral block. Pinprick sensation was assessed using a 22-gauge short bevel needle from T2 to T10 at midclavicular line bilaterally . Pinprick response was recorded quantitatively as 1 (sensation) or 0 (no sensation/numb). Successful block was defined as the pinprick score was 0 at 20 min after block. Otherwise, it was defined as a failed block.

Treatment:

Procedure: Paravertebral block at T4 and T5 level