Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement
<b>Aim:</b> To systematically refine and recommend parameter settings of spot size, power, and treatment duration using the Pascal<sup>®</sup> photocoagulator, a multi-spot, semi-automated, short-duration laser system. <b>Materials and Methods:</b> A retr...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2011-01-01
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| Series: | Indian Journal of Ophthalmology |
| Subjects: | |
| Online Access: | http://www.ijo.in/article.asp?issn=0301-4738;year=2011;volume=59;issue=2;spage=87;epage=91;aulast=Sheth |
| _version_ | 1819033508481335296 |
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| author | Sheth Saumil Lanzetta Paolo Veritti Daniele Zucchiatti Ilaria Savorgnani Carola Bandello Francesco |
| author_facet | Sheth Saumil Lanzetta Paolo Veritti Daniele Zucchiatti Ilaria Savorgnani Carola Bandello Francesco |
| author_sort | Sheth Saumil |
| collection | DOAJ |
| description | <b>Aim:</b> To systematically refine and recommend parameter settings of spot size, power, and treatment duration using the Pascal<sup>®</sup> photocoagulator, a multi-spot, semi-automated, short-duration laser system. <b>Materials and Methods:</b> A retrospective consecutive series with 752 Caucasian eyes and 1242 laser procedures over two years were grouped into, (1) 374 macular focal / grid photocoagulation (FP), (2), 666 panretinal photocoagulation (PRP), and (3) 202 barrage photocoagulation (BP). Parameters for power, duration, spot number, and spot size were recorded for every group. <b>Results:</b> Power parameters for all groups showed a non-gaussian distribution; FP group, median 190 mW, range 100 - 950 mW, and PRP group, median 800 mW, range 100 - 2000 mW. On subgroup comparison, for similar spot size, as treatment duration decreased, the power required increased, albeit in a much lesser proportion than that given by energy = power x time. Most frequently used patterns were single spot (89% of cases) in FP, 5 Χ 5 box (72%) in PRP, and 2 Χ 2 box (78%) in BP. Spot diameters as high as ≈ 700 μm on retina were given in the PRP group. Single session PRP was attempted in six eyes with a median spot count of 3500. <b>Conclusion:</b> Overall, due to the small duration of its pulse, the Pascal<sup>®</sup> photocoagulator tends to use higher powers, although much lower cumulative energies, than those used in a conventional laser. The consequent lesser heat dissipation, especially lateral, can allow one to use relatively larger spot sizes and give more closely spaced burns, without incurring significant side effects. |
| first_indexed | 2024-12-21T07:18:57Z |
| format | Article |
| id | doaj.art-5d7f72fd4e934bf19d5bab81df06fb55 |
| institution | Directory Open Access Journal |
| issn | 0301-4738 1998-3689 |
| language | English |
| last_indexed | 2024-12-21T07:18:57Z |
| publishDate | 2011-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Indian Journal of Ophthalmology |
| spelling | doaj.art-5d7f72fd4e934bf19d5bab81df06fb552022-12-21T19:11:49ZengWolters Kluwer Medknow PublicationsIndian Journal of Ophthalmology0301-47381998-36892011-01-015928791Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinementSheth SaumilLanzetta PaoloVeritti DanieleZucchiatti IlariaSavorgnani CarolaBandello Francesco<b>Aim:</b> To systematically refine and recommend parameter settings of spot size, power, and treatment duration using the Pascal<sup>®</sup> photocoagulator, a multi-spot, semi-automated, short-duration laser system. <b>Materials and Methods:</b> A retrospective consecutive series with 752 Caucasian eyes and 1242 laser procedures over two years were grouped into, (1) 374 macular focal / grid photocoagulation (FP), (2), 666 panretinal photocoagulation (PRP), and (3) 202 barrage photocoagulation (BP). Parameters for power, duration, spot number, and spot size were recorded for every group. <b>Results:</b> Power parameters for all groups showed a non-gaussian distribution; FP group, median 190 mW, range 100 - 950 mW, and PRP group, median 800 mW, range 100 - 2000 mW. On subgroup comparison, for similar spot size, as treatment duration decreased, the power required increased, albeit in a much lesser proportion than that given by energy = power x time. Most frequently used patterns were single spot (89% of cases) in FP, 5 Χ 5 box (72%) in PRP, and 2 Χ 2 box (78%) in BP. Spot diameters as high as ≈ 700 μm on retina were given in the PRP group. Single session PRP was attempted in six eyes with a median spot count of 3500. <b>Conclusion:</b> Overall, due to the small duration of its pulse, the Pascal<sup>®</sup> photocoagulator tends to use higher powers, although much lower cumulative energies, than those used in a conventional laser. The consequent lesser heat dissipation, especially lateral, can allow one to use relatively larger spot sizes and give more closely spaced burns, without incurring significant side effects.http://www.ijo.in/article.asp?issn=0301-4738;year=2011;volume=59;issue=2;spage=87;epage=91;aulast=ShethBarrage photocoagulationfocal photocoagulationlaser powerlaser spot sizelaser treatment durationpanretinal photocoagulationpascal<sup>®</sup> photocoagulation |
| spellingShingle | Sheth Saumil Lanzetta Paolo Veritti Daniele Zucchiatti Ilaria Savorgnani Carola Bandello Francesco Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement Indian Journal of Ophthalmology Barrage photocoagulation focal photocoagulation laser power laser spot size laser treatment duration panretinal photocoagulation pascal<sup>®</sup> photocoagulation |
| title | Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement |
| title_full | Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement |
| title_fullStr | Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement |
| title_full_unstemmed | Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement |
| title_short | Experience with the Pascal<sup>®</sup> photocoagulator: An analysis of over 1200 laser procedures with regard to parameter refinement |
| title_sort | experience with the pascal sup 174 sup photocoagulator an analysis of over 1200 laser procedures with regard to parameter refinement |
| topic | Barrage photocoagulation focal photocoagulation laser power laser spot size laser treatment duration panretinal photocoagulation pascal<sup>®</sup> photocoagulation |
| url | http://www.ijo.in/article.asp?issn=0301-4738;year=2011;volume=59;issue=2;spage=87;epage=91;aulast=Sheth |
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