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The aim of this prospective observational study was to evaluate the changes of skin temperature after the paravertebral block measured by infrared thermography.
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Successful Paravertebral block | 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. |
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| Failed Paravertebral block | 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. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Paravertebral block at T4 and T5 level | Procedure | Paravertebral block is performed at T4 and T5 level under realtime ultrasound guidenance with 10ml of 0.5% ropivacaine for each block, respectively. |
| Measure | Description | Time Frame |
|---|---|---|
| Changes of skin temperature | Changes of skin temperature determined by infrared thermography | From baseline up to 20 minutes after block |
| Measure | Description | Time Frame |
|---|---|---|
| Noinvasive blood pressure | Vital signs | From baseline up to 20 minutes after block |
| Heart rate | Vital signs | From baseline up to 20 minutes after block |
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Inclusion Criteria:
Exclusion Criteria:
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Patients scheduled for elective surgery with planned paravertebral block for multimodel analgesia.
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| Name | Affiliation | Role |
|---|---|---|
| Wei Mei | Huazhong University of Science and Technology | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Tongji Hospital | Wuhan | Hubei | 430030 | China |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 34116642 | Derived | Zhang S, Liu Y, Liu X, Liu T, Li P, Mei W. Infrared thermography for assessment of thoracic paravertebral block: a prospective observational study. BMC Anesthesiol. 2021 Jun 11;21(1):168. doi: 10.1186/s12871-021-01389-4. |
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For patient's privacy
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| SPO2 | vital signs | From baseline up to 20 minutes after block |
| Sensory block level | Sensory block level determined by pinprick. | From baseline up to 20 minutes after block |