Evidence map›Paper›PMID 33479439›Full record

ArticleScientific reports2021

The relationship between exacerbated diabetic peripheral neuropathy and metformin treatment in type 2 diabetes mellitus.

Manal Mohammed Hashem, Ahmed Esmael, Abdelfattah Kasem Nassar, Mohammed El-Sherif

Open access · goldFull text read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 1 pooled it
6.3field-weighted citation impact, top 3% 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

27 citing papers in PubMed, 1 synthesis or guideline pooled it, 56 citations in OpenAlex.

  1. Pooled it
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  8. Metformin Induced Vitamin B12 deficiency: A Cross sectional study. Untangling the connection.Clinical medicine insights. Endocrinology and diabetes · 2025
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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

4 authors at 3 institutions in 1 country.

Manal Mohammed HashemInternal Medicine Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
Ahmed EsmaelNeurology Department, Mansoura Faculty of Medicine, Mansoura University, Mansoura, 35516, Dakahlia, Egypt.
Abdelfattah Kasem NassarRheumatology Department, Physical Medicine and Rehabilitation Faculty of Medicine, Al-Azhar University, Cairo, Egypt.
Mohammed El-SherifNeurology Department, Mansoura Faculty of Medicine, Mansoura University, Mansoura, 35516, Dakahlia, Egypt. elsherifmohammed@mans.edu.eg.
Mansoura University · EGAl-Azhar University · EGZagazig University · EG

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Metformin-treated diabetics (MTD) showed a decrease in cobalamin, a rise in homocysteine, and methylmalonic acid, leading to accentuated diabetic peripheral neuropathy (DPN). This study aimed to determine whether or not metformin is a risk factor for DPN. We compared MTD to non-metformin-treated diabetics (NMTD) clinically using the Toronto Clinical Scoring System (TCSS), laboratory (methylmalonic acid, cobalamin, and homocysteine), and electrophysiological studies. Median homocysteine and methylmalonic acid levels in MTD vs. NMTD were 15.3 vs. 9.6 µmol/l; P < 0.001 and 0.25 vs. 0.13 µmol/l; P = 0.02, respectively with high statistical significance in MTD. There was a significantly lower plasma level of cobalamin in MTD than NMTD. Spearman's correlation showed a significant negative correlation between cobalamin and increased dose of metformin and a significant positive correlation between TCSS and increased dose of metformin. Logistic regression analysis showed that MTD had significantly longer metformin use duration, higher metformin dose > 2 g, higher TCSS, lower plasma cobalamin, and significant higher homocysteine. Diabetics treated with metformin for prolonged duration and higher doses were associated with lower cobalamin and more severe DPN.

Indexed as

Diabetes Mellitus, Type 2Diabetic NeuropathiesFemaleHomocysteineHumansMaleMetforminMethylmalonic AcidMiddle AgedPeripheral Nervous System DiseasesRisk FactorsVitamin B 12HomocysteineMetforminMethylmalonic AcidVitamin B 12

Identifiers

PMID33479439
PMCPMC7820469
OpenAlexW3123047394

What OpenQuestion holds

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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.