Evidence map›Paper›PMID 33111950›Full record

Trial reportPain medicine (Malden, Mass.)2020

Thoracic Paravertebral Blockade Reduces Chronic Postsurgical Pain in Breast Cancer Patients: A Randomized Controlled Trial.

Zeng-Mao Lin, Mu-Han Li, Feng Zhang, Xue Li, Chun-Li Shao, Xue-Ying Li, Dong-Xin Wang

Open access · hybridAbstract readRandomized Controlled Trial
In one paragraph

Trial report in Pain medicine (Malden, Mass.), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.

0numbers the graph read from it
0cells of the map it votes in
8citing papers in PubMed
1.6field-weighted citation impact, top 16% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

8 citing papers in PubMed, 19 citations in OpenAlex.

  1. Trial
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 2 institutions in 1 country.

Zeng-Mao LinDepartment of Anaesthesiology and Critical Care Medicine, Peking University First Hospital, Beijing, China.
Mu-Han LiDepartment of Anaesthesiology and Critical Care Medicine, Peking University First Hospital, Beijing, China.
Feng ZhangDepartment of Anaesthesiology and Critical Care Medicine, Peking University First Hospital, Beijing, China.
Xue LiDepartment of Anaesthesiology and Critical Care Medicine, Peking University First Hospital, Beijing, China.
Chun-Li ShaoDepartment of Anaesthesiology and Critical Care Medicine, Peking University First Hospital, Beijing, China.
Xue-Ying LiDepartment of Biostatics, Peking University First Hospital, Beijing, China.
Dong-Xin WangDepartment of Anaesthesiology and Critical Care Medicine, Peking University First Hospital, Beijing, China.
Peking University · CNCapital Medical University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveTo evaluate the effect of multilevel single-shot thoracic paravertebral blockade (PVB) on the occurrence of chronic postsurgical pain (CPSP) in patients undergoing breast cancer surgery.

designA randomized controlled trial with two parallel groups.

settingA tertiary hospital.

methodsPatients scheduled for breast cancer surgery were randomized to receive either ultrasound-guided multilevel single-shot PVB from T2 to T5 (the PVB group) or nothing (the control group). Surgery was then performed under general anesthesia. Patients were followed up for 12 months after surgery. The primary end point was incidence of CPSP at six months after surgery.

resultsA total of 218 patients were enrolled and randomized; of these, 208 and 204 completed six- and 12-month follow-up, respectively. The incidence of CPSP at six months was significantly lower in the PVB group (12.5% [13/104]) than in the control group (24.0% [25/104], relative risk = 0.52, 95% CI = 0.28-0.96, P = 0.031). Pain scores within 48 hours both at rest and with movement were lower in the PVB group than the control group (P = 0.006 and P < 0.001, respectively). The percentages of patients with neuropathic pain were also lower in the PVB group than the control group at both six and 12 months after surgery (P = 0.016 and 0.028, respectively). Adverse events did not differ between groups.

conclusionsFor patients undergoing breast cancer surgery, multilevel single-shot PVB reduces the incidence of CPSP at six months; it also improves early postoperative analgesia and reduces neuropathic pain at six and 12 months after surgery.

Indexed as

Breast NeoplasmsNerve BlockHumansMastectomyPostoperative PainBreast CancerChronic Postsurgical PainNeuropathic PainSurgeryThoracic Paravertebral Blockade

Identifiers

PMID33111950
PMCPMC7770235
OpenAlexW3097517700

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.