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1 대한안과학회지 2012 년제 53 권제 2 호 J Korean Ophthalmol Soc 2012;53(2): pissn: eissn: = 증례보고 = 알파 1- 교감신경길항제가수정체유화술에미치는영향 김은경 1 정성근 1 백남호 2 가톨릭대학교의과대학안과및시과학교실성모병원 1, 새빛안과병원 2 목적 : α 1- 교감신경길항제 (α 1-adrenergic blocker, α 1AB) 가수정체유화술에미치는영향과술전 α 1AB 복용중단이홍채이완증후군발생예방에효과가있는지알아보았다. 대상과방법 : α 1AB 를복용하다백내장수술일주일전부터중단한 20 명 (32 안 ) 과중단하지않은 20 명 (31 안 ), α 1AB 복용한적없는 20 명 (29 안 ) 을대상으로임상지표, 수술중지표를비교하였다. 결과 : 술전최대동공직경은 α 1AB 복용기왕력이없는군이 α 1AB 복용기왕력이있는두군에비해통계적으로유의하게컸다 ( 각각 p=0.027, p=0.018). 홍채이완증후군은술전 α 1AB 복용중단한군에서 6.25%, 중단하지않은군에서 6.45% 발생하였으며, α 1AB 복용기왕력이없는군에서는발생하지않았다. 술중사용된총초음파에너지양 (p=0.207) 및술후최대교정시력은세군간통계적으로유의한차이가없었다 (p=0.189). 결론 : α 1AB 복용시술전정확한문진과최대동공직경측정을통해홍채이완증후군의발생을예측한다면, 술중합병증발생을줄일수있다. 수술일주일전 α 1AB 복용중단은홍채이완증후군발생예방에효과가없었다. < 대한안과학회지 2012;53(2): > 수정체유화술을완벽하게수행하기위해서는수술시시야확보를위한충분한동공산대및탄력있는홍채유지를필요로하며, 동시에홍채손상의최소화도중요하다. 백내장수술시발생하는홍채이완증후군 (Intraoperative Floppy Iris Syndrome, IFIS) 은수술중홍채의과도한펄럭임, 각막절개창으로의홍채탈출및진행성동공축동을특징으로하는임상증후군이다. 1 지금까지보고에따르면, IFIS는전립선비대증치료로사용되는 α 1- 교감신경길항제 (α 1-adrenergic blocker, α 1AB) 의복용과관련이있으며, 2007년보고된논문에서는 α 1AB 의대표약물인 Tamsulosin (Harnal D R, Astellas Pharma., Japan) 은 IFIS의중요한위험인자로복용중인환자의 38-90% 에서 IFIS가발생한다고하였다. 2-4 전립선비대증은 50대이상남성의 50% 에서유병률을나타내는질환으로노년인구의증가와함께 α 1AB를복용하는빈도도늘어나고있다. IFIS의발생과관련된발표는많았으나, α 1AB가실제로수정체유화술에어떤영향을미치는지에대한객관적수치 접수일 : 2011년 5월 2일 게재허가일 : 2012년 1월 20일 심사통과일 : 2011 년 5 월 30 일 책임저자 : 백남호경기도고양시일산동구백석 2 동 새빛안과병원 Tel: , Fax: namhobaek@hotmail.com 분석및 IFIS 발생의예방과연관된연구는많이시행되지않았다. 본연구에서는 α 1AB를복용중인환자에서백내장수술시얻은여러임상자료를비교분석하여, α 1AB가수정체유화술에미치는영향을살펴보았고, 수술전 α 1AB복용의중단이실제로백내장수술시 IFIS 발생예방에효과가있는지에대해서도알아보았다. 대상과방법 2005년 1월부터 2009년 8월까지여의도성모병원에서백내장으로수정체유화술및후방인공수정체삽입술을시행받은환자 60명 (92안) 을대상으로하였다. α 1AB를 1년이상복용한환자 40명 (63안) 중백내장수술일주일전부터복용을중단한환자 20명 (32안) 을 A군, 복용을중단하지않은환자 20명 (31안) 을 B군, 그리고 α 1AB를복용한적이없는환자 20명 (29안 ) 을 C군으로분류하였다. 대상환자의평균연령은 67.3 ± 12.6세 (56-84세) 였으며, α 1AB의평균복용기간은 22.6 ±8.8개월 (10-34개월) 이었다 (Table 1). 복용중인 α 1AB의종류는 A군은 Tamsulosin (Harnal D R, Astellas Pharma Inc., Japan) 25안, Terazosin (Hytrin R, Abbott Inc., USA) 4안, Alfuzosin (Xatral R, Sanofi-Aventis, France) 3안이었고, B군은 Tamsulosin 28안, Terazosin 3안이었다. 당뇨가동반된환자는 A군 3명 (5안), B군 2명 (4안), C군 3명 (4안) 이었다

2 - 김은경외 : 알파 1- 교감신경길항제와수정체유화술 - Table 1. Characteristics of patients according to the groups Group A Group B Group C p-value * Patients/Eyes 20/32 20/31 30/29 Mean age (yr) 69.6 ± ± ± α 1AB duration (mon) 21.9 ± ± 10.8 N/A Diabetic patients/eyes 3/5 2/4 3/ Values are presented as number or mean ± SD. Group A used α 1AB without stopping before surgery; Group B, α 1AB with stopping before surgery (31 eyes), and Group C, did not used α 1AB (29 eyes). α 1AB = α 1-adrenergic blocker. * Obtained by comparision of three groups (A, B and C) with 1-way ANOVA. Table 2. Cataract densities of three groups as graded by the Lens Opacities Classification System III (LOCS III) LOCS III classification Group A Group B Group C p-value * NO NO3 & NO NO Total * Obtained by comparisions of three groups (A, B and C) with 1-way ANOVA. (eyes) Table 3. Comparision of preoperative maximum pupil diameters (mm) and best corrected visual acuities (log MAR) measured preoperatively and at 3 months postoperatively Group A Group B Group C p-value * Maximum pupil diameter (mm) Preoperative 8.2 ± ± ± BCVA (log MAR) Preoperative 0.22 ± ± ± Postoperative 3 months 0.03 ± ± ± Values are presented as mean ± SD. BCVA = best corrected visual acuity. * Obtained by comparisions of three groups (A, B, and C) with 1-way ANOVA. 수술전최대교정시력, 안압검사, 세극등현미경검사, 안저검사를시행하였으며, 각대상안의백내장정도는 LOCS III 분류법에따라기술되었다. 수술당일 1% Cyclopentolate (Ocucyclo R, Allergan, USA), Tropicamide (Mydrin-P R, Santen, Japan) 이용하여 10분간격으로각각 5회씩점안하여충분히산동을실시하였으며, 수술직전최대산동시동공직경을측정하였다. 수술은모두동일한술자에의해 0.5% proparacane hydrochloride (Alcaine, Alcon, USA) 으로점안마취후시행되었다. 약 3.0 mm의투명각막절개창을이측에만들고, 동일한점탄물질인 Viscoat (Alcon, USA) 을사용하여약 5.5 mm의수정체전낭원형절개술을시행하였다. 수정체유화술기계 (Infiniti Vision System, Alcon Laboratories, Inc., Fort Worth, Tx., USA) 를이용하여수정체유화술을시행한후, 접힘연성인공수정체를삽입하였다. 수술중사용된초음파에너지양, 수술중홍채펄럭임과홍채탈출의유무및추가산동을위한에피네프린사용유무그리고수술전, 수술 3개월후최대교정시력을측정하여비교하였 다. 술중사용된총초음파에너지양은절대초음파시간 (absolute phaco time=average phaco power phaco time) 으로평가하였다. 5 통계적인분석은 SPSS 19.0, ANOVA 를사용하였다. p-value가 0.05 미만인경우를통계적으로의의가있는것으로정의하였다. 결과 대상환자 60명 (92안) 을수술전세극등현미경검사를통해 LOCS III 분류법에따라경도핵경화군 (NO2), 중등도핵경화군 (NO3 & NO4), 심한핵경화군 (NO5) 으로분류하였다. 총 92안중경도핵경화군은 20안, 중등도핵경화군은 44안, 심한핵경화군은 28안이었으며, 중등도핵경화군이가장높은비율을차지하였다. α 1AB 복용을수술전중단한군, α 1AB 복용을중단하지않은군, α 1AB를복용한적이없는군간에백내장정도의비교는통계적으로의미있는차이가없었다 (Table 2)

3 - 대한안과학회지 2012 년제 53 권제 2 호 - α 1AB가동공산대에미치는영향을평가하기위해수술직전최대산동시동공직경을측정하였다. α 1AB 복용을수술전중단한군 (A군), α 1AB 복용을중단하지않은군 (B 군 ), α 1AB를복용한적이없는군 (C군) 의평균동공직경은각각 8.2 ± 0.31 mm, 7.9 ± 0.42 mm, 8.5 ± 0.79 mm였으며, C군이 A군과 B군에비해통계적으로유의하게컸으나 ( 각각 p=0.027, p=0.018), α 1AB의복용을수술전중단한군 (A군) 과중단하지않은군 (B군) 사이에는통계적으로유의한차이가없었다 (p=0.092)(table 3). α 1AB의복용이백내장수술후시력에미치는영향을평가하기위해수술전및수술후 3개월째최대교정시력을측정하였다. A군, B군, C군의수술전최대교정시력 (logmar) 은각각 0.22 ± 0.13, 0.40 ± 0.22, 0.38 ± 0.11였으며, 세군간통계적으로유의한차이가없었다 (p=0.318) (Table 3). 수술후 3개월째최대교정시력은 A군, B군, C군이각각 0.03 ± 0.08, 0.04 ± 0.10, 0.04 ± 0.09였으며, 역시세군간통계적으로유의한차이가없었다 (p=0.189). 세군모두수술전에비해수술후통계적으로유의한시력향상이있었으나 (p<0.05), α 1AB 복용및중단여부는백내장수술후 3개월째최대교정시력에영향을미치지않았다. 수정체유화술중초음파이용시간은 A군, B군, C군각각 ± 12.45초, ± 16.63초, ± 10.98초였으며, 세군간통계적으로유의한차이는없었다 (p=0.229). 수정체유화술시사용된총초음파에너지양은절대초음파시간을계산하여비교하였다. A군, B군, C군의절대초음파시간은각각 2791 ± % ㆍsec, 3027 ± % ㆍ sec, 2610 ± 97.81% ㆍsec였으며, 세군간통계적으로유 의한차이는없었다 (p=0.279)(table 4). 전체대상안을백내장핵경화정도에따라경도핵경화군, 중등도핵경화군, 심한핵경화군으로나눈후, A군, B군, C군과의절대초음파시간을비교하였는데, 경도핵경화군 (NO2), 중등도핵경화군 (NO3 & NO4), 심한핵경화군 (NO5) 모두에서 α 1AB 복용및중단여부는절대초음파시간에영향을미치지않았다 (Fig. 1). %, sec * p = p =0.428 p =0.234 NO2 NO3 & NO4 NO5 Group A Group B Group C Figure 1. Comparison of absolute phaco time (% sec) of three groups repective to cataract densities: group A (α 1AB takers who stop 1 week before cataract surgery), group B (α 1AB takers who did not stop before cataract surgery), group C (no medication users). * p-value obtained by comparison of three groups (A, B, and C) with 1-way ANOVA in mild cataract density group. p-value obtained by comparison of three groups (A, B, and C) with 1-way ANOVA in moderate cataract density group. p-value obtained by comparison of three groups (A, B, and C) with 1-way ANOVA in severe cataract density group. Table 4. Comparison of Absolute phacoemulsification time (% sec) during phacoemulsification Intraoperative parameters Group A Group B Group C p-value * Phaco time (sec) ± ± ± Average phaco power (%) ± ± ± Absolute phacoemulsification time (% sec) 2791 ± ± ± Values are presented as mean ± SD. * Obtained by comparision of three groups (A, B, and C) with 1-way ANOVA; Average phaco power (%) phaco time (sec). Table 5. Comparision of intraoperative complication rates (%) Intraoperative complications Group A Group B Group C Iris billowing Iris prolapse toward the corneal incision Progressive miosis (5 mm pupil diameter) Posterior capsule rupture Zonulysis IFIS outbreak * * IFIS outbreak consisting of 3 specific intraoperative phenomena: iris billowing, iris prolapsed toward the corneal incision, and progressive miosis

4 - 김은경외 : 알파 1- 교감신경길항제와수정체유화술 - α 1AB 복용과관련하여발생할수있는수술중합병증을각군별로비교해보았다. 수술중홍채펄럭임발생률은 A 군과 B군이 C군에비해높았으며, A군과 B군은비슷하였다. 수술시각막절개창으로의홍채탈출은 C군는발생하지않았으며, A군과 B군에서의발생률은비슷하였다. 수술중진행성동공축동의발생률은 B군에서 9.68% 로가장높았으며, 그다음으로 A군은 6.25% 이었고, C군은 3.45% 로가장낮았다. 후낭파열발생률은 A군은 3.13%, B군은 3.23%, C 군은 3.45% 로세군에서비슷하였다. 수술중홍채펄럭임, 수술절개창으로의홍채탈출및진행성동공축동이모두발생한홍채이완증후군은 C군에서는발생하지않았으며, A군은 6.25%, B군은 6.45% 로발생률은비슷하였다 (Table 5). 고찰 홍채이완증후군 (Intraoperative Floppy Iris Syndrome, IFIS) 은 2005년 Chang and Cambell 1 에의해처음기술었으며, 수술중물결치는홍채, 각막절개창으로의홍채탈출및진행하는동공수축을특징으로하는임상증후군이다. 이전까지는기술된세가지임상양상이모두있어야지만홍채이완증후군이라고명명하였지만, 최근발표된논문에서는세가지임상양상이모두있을경우를완전홍채이완증후군, 한가지또는두가지임상양상만있을경우불완전홍채이완증후군이라고분류하기도하였다. 2 본논문에서는세가지임상양상이모두있는경우를홍채이완증후군이라고정의하였다. IFIS는방광의평활근에작용하여전립선비대증치료에사용되는 α 1- 교감신경길항제 (α 1-adrenergic blocker, α 1AB) 의복용과관련이있으며, α 1AB의대표약물로는 Tamsulosin, Terazosin, Alfuzosin 등이있다. 2-5 또한최근여성의배뇨장애치료에도 α 1AB가사용되기시작하여, 여성에게도백내장수술시 α 1AB의복용유무를확인하여백내장수술에미치는영향에대해관심을가져야하겠다. α 1- 교감신경수용체에는세가지종류의 α 1A 수용체, α 1B 수용체, α 1D 수용체가있다. 6 α 1A 수용체와 α 1D 수용체는전립샘요도와방광에널리분포되어있으며, α 1A 수용체는홍채의이완근에 α 1B 수용체는홍채세동맥에도존재하는것으로알려져있다. 7 전립선비대증치료로사용되는 Tamsulosin, Terazosin, Alfuzosin과같은약제는이런세가지종류의 α 1- 교감신경수용체에모두작용하기때문에배뇨개선효과와함께동공수축과같은합병증을유발할수있다. 가장널리사용되는 α 1AB인 Tamsulosin은 48-72시간정도의긴반감기를가지는약물로장기간복용시비가역적인 홍채이완근위축을일으킨다는보고도있다 본연구에서는 α 1AB를복용한적이있는경우와복용한적이없는경우를비교하여, α 1AB가수정체유화술에미치는영향과 IFIS의발생을비교하였다. 또한 Tamsulosin의반감기를고려하여백내장수술전일주일전부터 α 1AB 복용을중단한경우와중단하지않은경우를비교하여수술일주일전부터 α 1AB 복용을중단하는것이 IFIS 발생의예방에효과가있는지를알아보았다. α 1AB가수술전동공산대에미치는영향에대해살펴보면, α 1AB를복용한적이있는경우가아무런약물을복용하지않았던경우에비해수술전최대산동시동공직경이통계적으로유의하게작았다. Chang et al 4 가보고한바에따르면 α 1AB복용은홍채이완근위축을유발하여동공산대를저해하고, 이로인해산동이불충분한상태에서백내장수술을시행할경우수술시야가좁아져후낭파열, 전방으로의유리체탈출및전방출혈과같은합병증이발생할가능성이높다고하였는데, 본연구에서도 α 1AB가수술전부적절한동공산동을유발하는것으로밝혀졌다. 백내장수술전 α 1AB복용을중단하는것이수술전동공산대에영향을주는지를알아보았는데, 수술일주일전부터 α 1AB복용을중단하였던경우와중단하지않았던경우의수술전최대산동시동공직경은통계적으로유의한차이가없었다. Chang and Campbell 1 은수술 1-2주전 Tamsulosin 복용을일시적으로중단하는것이홍채이완증후군을예방하는데도움이된다고주장한적이있다. Cantrell et al 13 의보고에서도 α 1AB의유실기간 (washout period) 을고려하여백내장수술전 α 1AB 복용을중단하는것이술중합병증발생을줄일수있을것이라고하였다. 하지만최근 Santaella el al 8 의보고에서는, α 1AB를 1년이상장기간복용한경우는비가역적인홍채이완근위축을유발하여동공산대를저해할수있기때문에수술전 Tamsulosin 복용의중단은 IFIS 발생에예방적효과가없다고하였다. 본연구에서도 α 1AB를 1년이상복용한경우를대상으로하여, α 1AB 복용을일주일전부터중단한것은수술전최대산동시동공직경에영향을주지않았다. α 1AB 복용은작은동공과수술중홍채펄럭임을유발하여수정체유화술시어려움을유발할수있다. 하지만본연구결과 α 1AB 복용여부는수정체유화술시사용한총초음파양에통계적으로유의한영향을미치지않았으며, 또한 α 1AB 복용은백내장수술후 3개월째의최대교정시력에도영향을미치지않았다. 이는 α 1AB를복용중인환자에서수정체유화술시적절한관류압과흡입력을유지하여시행한다면안정적으로수정체를제거할수있음을시사한다. Manvikar and Allen 11 은수정체유화술시 α 1AB를복용 259

5 - 대한안과학회지 2012 년제 53 권제 2 호 - 으로인한홍채펄럭임및동공수축이있을경우가능한낮은흡입속도와흡입력을유지하면서안정된전방을유지하는것이도움이된다고하였다. 본연구에서 α 1AB를복용한적이있는경우 6.3% 에서 IFIS가발생하였으며, α 1AB 복용을중단한경우와중단하지않은경우 IFIS 발생률은비슷하였다. 또한 α 1AB를복용한적이있는경우, IFIS의특징적인임상양상세가지중진행성동공수축의발생률이가장높았다. 수술중동공축동을예방하기위해서점탄물질을적절히전방에주입하여동공연을밀어산동상태를유지할수도있다. 점탄물질중점도가매우높으면서도동시에보유력이좋은 2.3% sodium hyaluronate (Healon5 R ) 의사용이도움이될수있다. 점탄물질이외에도수술중동공을확대하기위한여러가지방법들이있으며, 홍채확장기구를이용한기계적확장술이그중하나이다. 술자의경우에는사용하지않았지만, iris retractor, iris protector ring, Mercher pupil dilator 및 Malyugin ring과같이작은동공시백내장수술을위한여러가지보조기구들이개발되어있다 또한수술시전방에에피네프린 (1:10,000-20,000) 주입을하거나, 수술전 10% phenylephrine과 2% cyclopentolate를사용하는것도도움이될수있다는보고도있다 결론적으로 α 1AB의복용은백내장수술전동공산대에영향을미치며, 홍채이완증후군발생을유발하여수술의합병증발생위험을높인다. 하지만수술전자세한병력청취및최대산동시동공직경측정을통하여 IFIS 발생을예측함으로써수술시발생할수있는상황에대비하고, 점탄물질과같은보조물질과적절한수정체유화술기법을사용하면안전하게수술을할수있다. 본연구결과수술일주일전부터 α 1AB복용의중단은홍채이완증후군발생예방에효과가없었다. α 1AB 복용을중단하는것이홍채이완증후군예방에효과가없으며, 장기간복용을중단할경우배뇨장애를유발하여삶의질을떨어뜨릴수있으므로, 백내장수술전 α 1AB 복용을중단하는것은권장되지않는다. 최근여성의배뇨장애치료에도 α 1AB가사용되는추세이므로, 수술전남성및여성환자모두에서 α 1AB 복용력을물어보아야하며, 당뇨및기타안과질환을동반하면서 α 1AB 를복용중인환자에대해서는더주의를기울여수술해야하겠다. 또한수술전환자및보호자와의상담을통해 α 1AB 가백내장수술에미칠수있는영향에대한충분한설명이필요하며, 합병증발생에관한동의를구한후수술을시행해야하겠다. 본연구에서는남성환자만을대상으로하였으나 α 1AB를복용중인여성환자까지포함한연구를시행하는것도 IFIS 발생을폭넓게이해하는데도움이될수있을것이라고생각한다. 참고문헌 1) Chang DF, Campbell JR. Intraoperative floppy iris syndrome associated with tamsulosin. J Cataract Refract Surg 2005;31: ) Chatziralli IP, Sergentanis TN. Risk factors for intraoperative floppy iris syndrome: a meta-analysis. Ophthalmology 2011;118: ) Oshika T, Ohashi Y, Inamura M, et al. Incidence of intraoperative floppy iris syndrome in patients on either systemic or topical alpha(1)-adrenoceptor antagonist. Am J Ophthalmol 2007;143: ) Chang DF, Braga-Mele R, Mamalis N, et al. ASCRS White Paper: clinical review of intraoperative floppy-iris syndrome. J Cataract Refract Surg 2008;34: ) Cho KJ, Lee HS, Joo CK. The effectiveness and safety of the phaco prechopper technique before lens phacoemulsification in cataract surgery. J Korean Ophthalmol Soc 2008;49: ) Michel MC, Okutsu H, Noguchi Y, et al. In vivo studies on the effects of alpha1-adrenoceptor antagonists on pupil diameter and urethral tone in rabbits. Naunyn Schmiedebergs Arch Pharmacol 2006;372: ) Panagis L, Basile M, Friedman AH, Danias J. Intraoperative floppy iris syndrome: report of a case and histopathologic analysis. Arch Ophthalmol 2010;128: ) Santaella RM, Destafeno JJ, Stinnett SS, et al. The effect of alpha1-adrenergic receptor antagonist tamsulosin (Flomax) on iris dilator smooth muscle anatomy. Ophthalmology 2010;117: ) Arshinoff SA. Modified SST-USST for tamsulosin-associated intraoperative [corrected] floppy-iris syndrome. J Cataract Refract Surg 2006;32: ) Yu Y, Koss MC. Functional characterization of alpha-adrenoceptors mediating pupillary in rats. Eur J Pharmacol 2003; 471: ) Manvikar S, Allen D. Cataract surgery management in patients taking tamsulosin staged approach. J Cataract Refract Surg 2006;32: ) Shin KH, Sohn HJ, Lee DY, Nam DH. A case of intraoperative floppy iris syndrome in a patient using tamsulosin. J Korean Ophthalmol Soc 2009;50: ) Cantrell MA, Bream-Rouwenhorst HR, Steffensmeier A, et al. Intraoperative floppy iris syndrome associated with alpha-adrenergic receoptor antagonists. Ann Pharmacother 2008;42: ) Tint NL, Yeung AM, Alexander P. Management of intraoperative floppy-iris syndrome-associated iris prolapse using a single iris retractor. J Cataract Refract Surg 2009;35: ) Chan DG, Francis IC. Intraoperative management of iris prolapse using iris hooks. J Cataract Refract Surg 2005;31: ) Oetting TA, Omphroy LC. Modified technique using flexible iris retractors in clear corneal cataract surgery. J Cataract Refract Surg 2002;28: ) Lee KJ, Figueira EC, Sharma NS, et al. Iris prolapse and the floppy-iris syndrome. J Cataract Refract Surg 2007;33: ) Chen AA, Kelly JP, Bhandari A, Wu MC. Pharmacologic prophylaxis and risk factors for intraoperative floppy-iris syndrome in phacoemulsification performed by resident physicians. J Cataract Refract Surg 2010;36: ) Takmaz T, Can I. Clinical features, complications, and incidence of 260

6 - 김은경외 : 알파 1- 교감신경길항제와수정체유화술 - intraoperative floppy iris syndrome in patients taking tamsulosin. Eur J Ophthalmol 2007;17: ) Chan FM, Mathur R, Ku JJ, et al. Short-term outcomes in eyes with posterior capsule rupture during cataract surgery. J Cataract Refract Surg 2003;29: ) Ang GS, Whyte IF. Effect and outcomes of posterior capsule rupture in a district general hospital setting. J Cataract Refract Surg 2006;32: =ABSTRACT= The Effect of α 1 -Adrenergic Blocker on Phacoemulsification Eun Kyoung Kim, MD 1, Sung Kun Chung, MD, PhD 1, Nam Ho Baek, MD, PhD 2 Department of Ophthalmology and Visual Science, The Catholic University of Korea College of Medicine 1, Seoul, Korea Department of Ophthalmology, Saevit Eye Hospital 2, Seoul, Korea Purpose: To evaluate the influence of α 1-adrenergic blocker on phacoemulsification and the preventive effect of adrenergic blocker (AB) cessation before cataract surgery. Methods: A prospective study was performed involving 92 eyes of 60 patients undergoing cataract surgery. Cases were divided into three groups: the use of α 1AB with discontinuance before surgery (32 eyes), the use of α 1AB with no discontinuance before surgery before surgery (31 eyes), and eyes not treated with α 1AB (29 eyes). Clinical measurements and intraoperative parameters were compared among the three groups. Results: Preoperative maximum pupil diameters of patients treated with α 1AB were smaller than those of patients not administered α 1AB (p = and p = 0.018, respectively). The incidence of IFIS in the patients using of α 1AB with discontinuance before surgery was 6.25%, and that in the patients using of α 1AB with no discontinuance before surgery was 6.45%. There was no IFIS outbreak in the patients not using of α 1AB. We noted no significant differences in absolute phaco time during phacoemulsification (p = 0.207) or in the three-month postoperative best corrected visual acuities among the three groups (p = 0.189). Conclusions: Importantly, there appears to be a significant correlation between α 1AB and the development of IFIS. To prevent complications of IFIS, surgeons should be vigilant in identifying patients taking α 1AB, checking the degree of preoperative pupil dilatation and anticipating intraoperative difficulties. In addition, appropriate modifications should be made to the surgical strategy. Furthermore there was no benefit to discontinuing α 1AB treatment before cataract surgery in the prevention of IFIS. J Korean Ophthalmol Soc 2012;53(2): Key Words: α 1-adrenergic blocker, Intraoperative floppy iris syndrome, Phacoemulsification Address reprint requests to Nam Ho Baek, MD, PhD Saevit Eye Hospital # Baekseok 2-dong, Ilsandong-gu, Goyang , Korea Tel: , Fax: , namhobaek@hotmail.com 261

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