Evidence map›Paper›PMID 35220474›Full record

ArticleWorld journal of urology2022

Laser operator duty cycle effect on temperature and thermal dose: in-vitro study.

Marne M Louters, Julie J Dau, Timothy L Hall, Khurshid R Ghani, William W Roberts

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In one paragraph

Article in World journal of urology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
2.1field-weighted citation impact, top 14% 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

21 citing papers in PubMed, 27 citations in OpenAlex.

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  12. Turning up the HEAT Surgical simulation of the Moses 2.0 laser in an anatomic model.Canadian Urological Association journal = Journal de l'Association des urologues du Canada · 2024
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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

5 authors at 1 institution in 1 country.

Marne M LoutersDepartment of Urology, University of Michigan, Medical Science I, 1137 Catherine Street, 4432, Ann Arbor, MI, 48109-5330, USA. lmarne@med.umich.edu.ORCID http://orcid.org/0000-0002-7750-9150
Julie J DauDepartment of Urology, University of Michigan, Medical Science I, 1137 Catherine Street, 4432, Ann Arbor, MI, 48109-5330, USA.
Timothy L HallDepartment of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.
Khurshid R GhaniDepartment of Urology, University of Michigan, Medical Science I, 1137 Catherine Street, 4432, Ann Arbor, MI, 48109-5330, USA.
William W RobertsDepartment of Urology, University of Michigan, Medical Science I, 1137 Catherine Street, 4432, Ann Arbor, MI, 48109-5330, USA.
University of Michigan · US

Funding

Boston Scientific Corporation AWD004501
6 · The paper itself

Abstract

purposeHigh-power laser lithotripsy can elevate temperature within the urinary collecting system and increase risk of thermal injury. Temperature elevation is dependent on power settings and operator duty cycle (ODC)-the percentage of time the laser pedal is depressed. The objective of this study was to quantify temperature and thermal dose resulting from laser activation at different ODC in an in-vitro model.

methodsHolmium laser energy (1800 J) was delivered at 30 W (0.5 J × 60 Hz) to a fluid filled glass bulb. Room temperature irrigation was applied at 8 ml/min. ODC was evaluated in 10% increments from 50-100%. Bulb fluid temperature was recorded and thermal dose calculated. Time to reach threshold of thermal injury and maximal allowable energy were also determined at each ODC.

resultsUpon laser activation, there was an immediate rise in fluid temperature with a "saw-tooth" oscillation superimposed on the curves for 50-90% ODC corresponding to periodic activation of the laser. Higher ODC resulted in greater maximum temperature and thermal dose, with ODC ≥ 70% exceeding threshold. Use of 50% compared to 60% ODC resulted in a tenfold increase in time required to reach threshold of thermal injury and an eightfold increase in maximal allowable energy.

conclusionsLaser activation at higher ODC produced greater fluid temperature and thermal dose. Time to threshold of thermal injury and maximal allowable energy were dramatically higher for 50% compared to 60% ODC at high-power settings. Proper management of laser ODC can enhance patient safety and optimize stone treatment.

Indexed as

Lasers, Solid-StateLithotripsy, LaserFeverHumansTemperatureUreteroscopyLaser lithotripsyOperator duty cycleTemperatureThermal dose

Identifiers

PMID35220474
OpenAlexW4214645230

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.