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The purpose of this study was to compare two different anesthesia methods for pain control during panretinal photocoagulation (PRP), a type of laser surgery that treats proliferative diabetic retinopathy (PDR).
The study included eyes from patients with diabetes and proliferative diabetic retinopathy who were scheduled to undergo their first PRP session. Participants were split into two groups to receive either peribulbar anesthesia, which is a type of anesthesia injected through the eyelid, or a sham injection with topical anesthesia only.
Pain on a numerical scale and vital signs were recorded before and for 15 minutes during PRP. These results were compared between the two groups to determine which method delivers superior pain control.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Peribulbar anesthesia intervention group | Experimental | The intervention administered was topical anesthesia with peribulbar anesthesia consisting of a lidocaine and bupivacaine injection. |
|
| Control group | Sham Comparator | The control group received only topical anesthesia and a sham peribulbar injection. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Peribulbar anesthesia with 0.5% bupivacaine and 2% lidocaine | Drug | A mixture of 1.5 mL of 0.5% bupivacaine and 1.5 mL of 2% lidocaine was prepared in a 3 mL syringe. The peribulbar injection was administered using a 25G needle inserted horizontally through the inferior palpebral conjunctiva, directed axially over the infraorbital rim, and then angled upward to deliver the anesthetic into the orbit. |
| Measure | Description | Time Frame |
|---|---|---|
| Pain perception during PRP administration | patient perception of pain during PRP administration in each eye, measured using the Numerical Rating Scale (NRS). The NRS measures pain intensity on a scale of 0 to 10, where 0 corresponds to the absence of pain and 10 represents the worst pain imaginable. | Pain on the NRS scale was measured at the 1-, 5-, 10-, and 15-minute marks while undergoing PRP application in each eye. |
| Measure | Description | Time Frame |
|---|---|---|
| Heart rate | Heart rate measured as beats per minute using the Aquarius Vital Sign Monitor (Shenzhen Northern Meditec Limited, Shenzhen, China) | at baseline before the start of PRP, and at the 1-, 5-, 10-, and 15-minute marks while undergoing PRP application in each eye. |
| Respiratory rate |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| José Gerardo GarcÃa Aguirre, MD | Asociación Para Evitar la Ceguera en México, I.A.P. | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Asociacion Para Evitar la Ceguera en Mexico, I.A.P. | Mexico City | Mexico City | 04030 | Mexico |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 16770022 | Background | Kumar CM. Orbital regional anesthesia: complications and their prevention. Indian J Ophthalmol. 2006 Jun;54(2):77-84. doi: 10.4103/0301-4738.25826. | |
| 8880832 | Background | Schobel HP, Ringkamp M, Behrmann A, Forster C, Schmieder RE, Handwerker HO. Hemodynamic and sympathetic nerve responses to painful stimuli in normotensive and borderline hypertensive subjects. Pain. 1996 Aug;66(2-3):117-24. doi: 10.1016/0304-3959(96)03079-5. |
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De-identified participant data will be made available to qualified researchers upon request to the corresponding author.
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | May 31, 2026 |
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|
| Tetracaine 5% drops | Drug | A single drop of topical 5% tetracaine |
|
Respiratory rate measured as breaths per minute using the Aquarius Vital Sign Monitor (Shenzhen Northern Meditec Limited, Shenzhen, China) |
| at baseline before the start of PRP, and at the 1-, 5-, 10-, and 15-minute marks while undergoing PRP application in each eye. |
| Oxygen saturation | Oxygen saturation was measured as SpO2 using the Aquarius Vital Sign Monitor (Shenzhen Northern Meditec Limited, Shenzhen, China) | at baseline before the start of PRP, and at the 1-, 5-, 10-, and 15-minute marks while undergoing PRP application in each eye. |
| 7702468 | Background | McGrath PA. Psychological aspects of pain perception. Arch Oral Biol. 1994;39 Suppl:55S-62S. doi: 10.1016/0003-9969(94)90189-9. |
| 11135722 | Background | Ripart J, Lefrant JY, de La Coussaye JE, Prat-Pradal D, Vivien B, Eledjam JJ. Peribulbar versus retrobulbar anesthesia for ophthalmic surgery: an anatomical comparison of extraconal and intraconal injections. Anesthesiology. 2001 Jan;94(1):56-62. doi: 10.1097/00000542-200101000-00013. |
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| 31668888 | Background | Gonzalez VH, Wang PW, Ruiz CQ. Panretinal Photocoagulation for Diabetic Retinopathy in the RIDE and RISE Trials: Not "1 and Done". Ophthalmology. 2021 Oct;128(10):1448-1457. doi: 10.1016/j.ophtha.2019.08.010. Epub 2019 Aug 21. |
| 19376588 | Background | Zakrzewski PA, O'Donnell HL, Lam WC. Oral versus topical diclofenac for pain prevention during panretinal photocoagulation. Ophthalmology. 2009 Jun;116(6):1168-74. doi: 10.1016/j.ophtha.2009.01.022. Epub 2009 Apr 19. |
| 37654069 | Background | Mafrici M, Fragiotta S, Tarsitano MG, Lorenzi U, Toscani L. Topical anesthesia versus topical and subconjunctival anesthesia combined in diabetic retinopathy photocoagulation. Eur J Ophthalmol. 2024 Mar;34(2):529-533. doi: 10.1177/11206721231199206. Epub 2023 Aug 31. |
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| 39921002 | Background | Arruda MP, Hira S, Lima RV, Barbosa LIT, Zinher MT, Al-Sharif L, Leal Moreira JLM, Del Valle GS. Pharmacological therapy for relieving pain in panretinal photocoagulation: A network meta-analysis of randomized controlled trials. Surv Ophthalmol. 2025 Jul-Aug;70(4):645-652. doi: 10.1016/j.survophthal.2025.01.018. Epub 2025 Feb 5. |
| 20856590 | Background | Tsoumani AT, Asproudis IC, Damigos D. Tetracaine 0.5% eyedrops with or without lidocaine 2% gel in topical anesthesia for cataract surgery. Clin Ophthalmol. 2010 Sep 7;4:967-70. doi: 10.2147/opth.s11755. |
| 19169228 | Background | Richardson C, Waterman H. Pain relief during panretinal photocoagulation for diabetic retinopathy: a national survey. Eye (Lond). 2009 Dec;23(12):2233-7. doi: 10.1038/eye.2008.421. |
| 16021194 | Background | Wu WC, Hsu KH, Chen TL, Hwang YS, Lin KK, Li LM, Shih CP, Lai CC. Interventions for relieving pain associated with panretinal photocoagulation: a prospective randomized trial. Eye (Lond). 2006 Jun;20(6):712-9. doi: 10.1038/sj.eye.6701989. Epub 2005 Jul 8. |
| 38201340 | Background | Gawecki M, Kicinski K, Bianco L, Battaglia Parodi M. Regression of Neovascularization after Panretinal Photocoagulation Combined with Anti-VEGF Injection for Proliferative Diabetic Retinopathy-A Review. Diagnostics (Basel). 2023 Dec 22;14(1):31. doi: 10.3390/diagnostics14010031. |
| 39336925 | Background | Wang S, Hua R, Zhao Y, Liu L. Laser Treatment for Diabetic Retinopathy: History, Mechanism, and Novel Technologies. J Clin Med. 2024 Sep 13;13(18):5439. doi: 10.3390/jcm13185439. |
| 35594075 | Background | Shahraki T, Arabi A, Nourinia R, Beheshtizadeh NF, Entezari M, Nikkhah H, Karimi S, Ramezani A. PANRETINAL PHOTOCOAGULATION VERSUS INTRAVITREAL BEVACIZUMAB VERSUS A PROPOSED MODIFIED COMBINATION THERAPY FOR TREATMENT OF PROLIFERATIVE DIABETIC RETINOPATHY: A Randomized Three-Arm Clinical Trial (CTPDR Study). Retina. 2022 Jun 1;42(6):1065-1076. doi: 10.1097/IAE.0000000000003450. |
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| 944535 | Background | Preliminary report on effects of photocoagulation therapy. The Diabetic Retinopathy Study Research Group. Am J Ophthalmol. 1976 Apr;81(4):383-96. doi: 10.1016/0002-9394(76)90292-0. |
| 33546872 | Background | Chaudhary S, Zaveri J, Becker N. Proliferative diabetic retinopathy (PDR). Dis Mon. 2021 May;67(5):101140. doi: 10.1016/j.disamonth.2021.101140. Epub 2021 Feb 3. No abstract available. |
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| 33940045 | Background | Teo ZL, Tham YC, Yu M, Chee ML, Rim TH, Cheung N, Bikbov MM, Wang YX, Tang Y, Lu Y, Wong IY, Ting DSW, Tan GSW, Jonas JB, Sabanayagam C, Wong TY, Cheng CY. Global Prevalence of Diabetic Retinopathy and Projection of Burden through 2045: Systematic Review and Meta-analysis. Ophthalmology. 2021 Nov;128(11):1580-1591. doi: 10.1016/j.ophtha.2021.04.027. Epub 2021 May 1. |
| 33275949 | Background | GBD 2019 Blindness and Vision Impairment Collaborators; Vision Loss Expert Group of the Global Burden of Disease Study. Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study. Lancet Glob Health. 2021 Feb;9(2):e144-e160. doi: 10.1016/S2214-109X(20)30489-7. Epub 2020 Dec 1. |
| 20046687 | Background | Ko BW, Shim JH, Lee BR, Cho HY. Analgesic effects of tramadol during panretinal photocoagulation. Korean J Ophthalmol. 2009 Dec;23(4):273-6. doi: 10.3341/kjo.2009.23.4.273. Epub 2009 Dec 4. |
| 32201732 | Background | Graue-Hernandez EO, Rivera-De-La-Parra D, Hernandez-Jimenez S, Aguilar-Salinas CA, Kershenobich-Stalnikowitz D, Jimenez-Corona A. Prevalence and associated risk factors of diabetic retinopathy and macular oedema in patients recently diagnosed with type 2 diabetes. BMJ Open Ophthalmol. 2020 Mar 10;5(1):e000304. doi: 10.1136/bmjophth-2019-000304. eCollection 2020. |
| 22301125 | Background | Yau JW, Rogers SL, Kawasaki R, Lamoureux EL, Kowalski JW, Bek T, Chen SJ, Dekker JM, Fletcher A, Grauslund J, Haffner S, Hamman RF, Ikram MK, Kayama T, Klein BE, Klein R, Krishnaiah S, Mayurasakorn K, O'Hare JP, Orchard TJ, Porta M, Rema M, Roy MS, Sharma T, Shaw J, Taylor H, Tielsch JM, Varma R, Wang JJ, Wang N, West S, Xu L, Yasuda M, Zhang X, Mitchell P, Wong TY; Meta-Analysis for Eye Disease (META-EYE) Study Group. Global prevalence and major risk factors of diabetic retinopathy. Diabetes Care. 2012 Mar;35(3):556-64. doi: 10.2337/dc11-1909. Epub 2012 Feb 1. |
| 36699020 | Background | Tan TE, Wong TY. Diabetic retinopathy: Looking forward to 2030. Front Endocrinol (Lausanne). 2023 Jan 9;13:1077669. doi: 10.3389/fendo.2022.1077669. eCollection 2022. |
| Jun 1, 2026 |
| Prot_SAP_000.pdf |
| ID | Term |
|---|---|
| D000377 | Agnosia |
| ID | Term |
|---|---|
| D010468 | Perceptual Disorders |
| D019954 | Neurobehavioral Manifestations |
| D009461 | Neurologic Manifestations |
| D009422 | Nervous System Diseases |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |
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| ID | Term |
|---|---|
| D002045 | Bupivacaine |
| D008012 | Lidocaine |
| D013748 | Tetracaine |
| ID | Term |
|---|---|
| D000813 | Anilides |
| D000577 | Amides |
| D009930 | Organic Chemicals |
| D000814 | Aniline Compounds |
| D000588 | Amines |
| D000083 | Acetanilides |
| D062366 | para-Aminobenzoates |
| D062365 | Aminobenzoates |
| D001565 | Benzoates |
| D000146 | Acids, Carbocyclic |
| D002264 | Carboxylic Acids |
| D001555 | Benzene Derivatives |
| D006841 | Hydrocarbons, Aromatic |
| D006844 | Hydrocarbons, Cyclic |
| D006838 | Hydrocarbons |
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