endovascular aneurysm repair: gender-specific results

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Endovascular aneurysm repair: Gender-specific results Kenneth Ouriel, MD, Roy K. Greenberg, MD, Daniel G. Clair, MD, Patrick J. O’Hara, MD, Sunita D. Srivastava, MD, Sean P. Lyden, MD, Timur P. Sarac, MD, Ellis Sampram, MD, and Brett Butler, MD, Cleveland, Ohio Objectives: The outcome for a wide variety of diseases and treatment methods varies by gender. In an effort to determine whether gender has a role in the outcome of endovascular aortic aneurysm repair, we analyzed data from consecutive patients treated at a single institution over 6 years. Methods: Over 6 years ending in March 2002, 704 patients underwent endovascular repair of an infrarenal abdominal aortic aneurysm at The Cleveland Clinic. Six hundred six patients (86.1%) were men and 98 patients (13.9%) were women. Preprocedure and postprocedure imaging studies were evaluated to determine the frequency of aneurysm sac shrinkage or growth, defined as diameter change equal to or greater than 5 mm. Presence and type of endoleak was assessed with non– contrast material– enhanced, post-contrast-enhanced, and delayed post-contrast-enhanced computed tomography scans. These and other clinical variables were assessed with the Kaplan-Meier method and the Cox-Mantel log-rank test, and values were expressed as mean SE. Results: Male and female patients were comparable with respect to baseline comorbid conditions. Women, however, were slightly older (76.7 0.7 years vs 74.4 0.3 years; P .009), and had slightly smaller aneurysms (5.2 0.1 cm vs 5.4 0.04 cm; P .033). There were no gender-specific differences in perioperative mortality (men, 1.3%; women, 3.1%; P .197) or mid-term (24 months) survival (men, 80% 2.6%; women, 78% 8.1%). Similarly, there were no differences at 24 months in risk for graft migration (7.5% 2.0% vs 5.4% 3.2%), need for secondary remedial procedures (24% 2.9% vs 21% 6.3%), conversion to open surgery (3.9% 1.5% vs 3.8% 2.7%), or post-repair aneurysm rupture (1.1% 0.9% vs 2.2% 2.2%) in male and female patients, respectively. In contrast, risk for graft limb occlusion at 24 months was significantly higher in women than in men (11% 5.2% vs 3.3% 1.1%; P .022). While frequency of endoleak of any type did not differ among male and female patients, aneurysm sac shrinkage at 24 months was more rapid in women (76% 8.1% vs 57% 3.5%; P .019). Conclusions: With the exception of slightly older age and somewhat smaller aneurysm, female patients are similar to male patients undergoing endovascular aneurysm repair. A greater frequency of graft limb occlusion was observed in female patients, but no statistically significant differences were detected in survival, rupture risk, or need for secondary procedures. Moreover, a more rapid rate of aneurysm sac shrinkage was detected in women. These observations suggest that endovascular aneurysm repair should be offered to suitable candidates irrespective of gender. (J Vasc Surg 2003;38: 93-8.) A wide array of diseases are manifested differently in male and female patients, including both the clinical aspects of the disease and the results of therapy. Foremost in this regard are coronary artery disease and coronary artery by- pass grafting, carotid stenosis and carotid endarterectomy, and infrainguinal disease and revascularization. 1 Abdomi- nal aortic aneurysm (AAA) is no exception. In large popu- lation-based studies of patients undergoing open surgical repair of AAA, the proportion of female patients rarely exceeds 20%. 2,3 Further, some studies have observed atten- uated survival in females after AAA repair, 4,5 but others series have failed to confirm these findings. 3,6 Whether outcome after open surgical aneurysm repair is gender-specific, certainly the results of endovascular re- pair may be disparate in male and female patients. While there is abundant information in the literature demonstrat- ing gender differences in aortoiliac anatomy, 7-9 only a few reports link these anatomic dissimilarities to clinical out- come. 10,11 Presently available devices are relatively large and may perform poorly in patients with small access ves- sels. 12 The large multicenter registries rarely include anal- yses of gender-specific results, and most patients studied are male. 13 Such information is of crucial importance, because some recent reports suggest that the results of the available endovascular trials may not be readily translatable to female patients. 11,14 In an effort to determine whether gender has a role in the outcome of endovascular aortic aneurysm repair, we analyzed data from a series of consecutive pa- tients who received treatment at a single institution. METHODS Over the 6 years between March 1996 and February 2002, 704 patients underwent endovascular repair of infra- renal AAA at The Cleveland Clinic. Six hundred six patients (86%) were men, and 98 patients (14%) were women. From the Department of Vascular Surgery, The Cleveland Clinic Founda- tion. Competition of interest: Dr Ouriel has been paid a consultant fee by Medtronic/AVE and Cordis. Dr Greenberg is a consultant for Cook and Boston Scientific. Reprint requests: Kenneth Ouriel, MD, Chairman, Department of Vascular Surgery, The Cleveland Clinic Foundation, Desk S40, 9500 Euclid Ave, Cleveland, OH 44195 (e-mail: [email protected]). Copyright © 2003 by The Society for Vascular Surgery and The American Association for Vascular Surgery. 0741-5214/2003/$30.00 0 doi:10.1016/S0741-5214(03)00127-7 93

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Page 1: Endovascular aneurysm repair: gender-specific results

Endovascular aneurysm repair: Gender-specificresultsKenneth Ouriel, MD, Roy K. Greenberg, MD, Daniel G. Clair, MD, Patrick J. O’Hara, MD,Sunita D. Srivastava, MD, Sean P. Lyden, MD, Timur P. Sarac, MD, Ellis Sampram, MD, andBrett Butler, MD, Cleveland, Ohio

Objectives: The outcome for a wide variety of diseases and treatment methods varies by gender. In an effort to determinewhether gender has a role in the outcome of endovascular aortic aneurysm repair, we analyzed data from consecutivepatients treated at a single institution over 6 years.Methods: Over 6 years ending in March 2002, 704 patients underwent endovascular repair of an infrarenal abdominalaortic aneurysm at The Cleveland Clinic. Six hundred six patients (86.1%) were men and 98 patients (13.9%) werewomen. Preprocedure and postprocedure imaging studies were evaluated to determine the frequency of aneurysm sacshrinkage or growth, defined as diameter change equal to or greater than 5 mm. Presence and type of endoleak wasassessed with non–contrast material–enhanced, post-contrast-enhanced, and delayed post-contrast-enhanced computedtomography scans. These and other clinical variables were assessed with the Kaplan-Meier method and the Cox-Mantellog-rank test, and values were expressed as mean � SE.Results: Male and female patients were comparable with respect to baseline comorbid conditions. Women, however, wereslightly older (76.7 � 0.7 years vs 74.4 � 0.3 years; P � .009), and had slightly smaller aneurysms (5.2 � 0.1 cm vs 5.4� 0.04 cm; P � .033). There were no gender-specific differences in perioperative mortality (men, 1.3%; women, 3.1%; P� .197) or mid-term (24 months) survival (men, 80% � 2.6%; women, 78% � 8.1%). Similarly, there were no differencesat 24 months in risk for graft migration (7.5% � 2.0% vs 5.4% � 3.2%), need for secondary remedial procedures (24% �2.9% vs 21% � 6.3%), conversion to open surgery (3.9% � 1.5% vs 3.8% �2.7%), or post-repair aneurysm rupture (1.1%� 0.9% vs 2.2% �2.2%) in male and female patients, respectively. In contrast, risk for graft limb occlusion at 24 monthswas significantly higher in women than in men (11% � 5.2% vs 3.3% � 1.1%; P � .022). While frequency of endoleak ofany type did not differ among male and female patients, aneurysm sac shrinkage at 24 months was more rapid in women(76% � 8.1% vs 57% � 3.5%; P � .019).Conclusions: With the exception of slightly older age and somewhat smaller aneurysm, female patients are similar to malepatients undergoing endovascular aneurysm repair. A greater frequency of graft limb occlusion was observed in femalepatients, but no statistically significant differences were detected in survival, rupture risk, or need for secondaryprocedures. Moreover, a more rapid rate of aneurysm sac shrinkage was detected in women. These observations suggestthat endovascular aneurysm repair should be offered to suitable candidates irrespective of gender. (J Vasc Surg 2003;38:93-8.)

A wide array of diseases are manifested differently inmale and female patients, including both the clinical aspectsof the disease and the results of therapy. Foremost in thisregard are coronary artery disease and coronary artery by-pass grafting, carotid stenosis and carotid endarterectomy,and infrainguinal disease and revascularization.1 Abdomi-nal aortic aneurysm (AAA) is no exception. In large popu-lation-based studies of patients undergoing open surgicalrepair of AAA, the proportion of female patients rarelyexceeds 20%.2,3 Further, some studies have observed atten-uated survival in females after AAA repair,4,5 but othersseries have failed to confirm these findings.3,6

Whether outcome after open surgical aneurysm repairis gender-specific, certainly the results of endovascular re-pair may be disparate in male and female patients. Whilethere is abundant information in the literature demonstrat-ing gender differences in aortoiliac anatomy,7-9 only a fewreports link these anatomic dissimilarities to clinical out-come.10,11 Presently available devices are relatively largeand may perform poorly in patients with small access ves-sels.12 The large multicenter registries rarely include anal-yses of gender-specific results, and most patients studied aremale.13 Such information is of crucial importance, becausesome recent reports suggest that the results of the availableendovascular trials may not be readily translatable to femalepatients.11,14 In an effort to determine whether gender hasa role in the outcome of endovascular aortic aneurysmrepair, we analyzed data from a series of consecutive pa-tients who received treatment at a single institution.

METHODS

Over the 6 years between March 1996 and February2002, 704 patients underwent endovascular repair of infra-renal AAA at The Cleveland Clinic. Six hundred six patients(86%) were men, and 98 patients (14%) were women.

From the Department of Vascular Surgery, The Cleveland Clinic Founda-tion.

Competition of interest: Dr Ouriel has been paid a consultant fee byMedtronic/AVE and Cordis. Dr Greenberg is a consultant for Cook andBoston Scientific.

Reprint requests: Kenneth Ouriel, MD, Chairman, Department of VascularSurgery, The Cleveland Clinic Foundation, Desk S40, 9500 Euclid Ave,Cleveland, OH 44195 (e-mail: [email protected]).

Copyright © 2003 by The Society for Vascular Surgery and The AmericanAssociation for Vascular Surgery.

0741-5214/2003/$30.00 � 0doi:10.1016/S0741-5214(03)00127-7

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Page 2: Endovascular aneurysm repair: gender-specific results

Patient age ranged from 49 to 100 years (mean � SD, 75 �8.1 years). The diameter of the aneurysm sac averaged 54 �10 mm in minor dimension and 58 � 11 mm in majordimension. Primarily, five different devices were used (Ta-ble I): Ancure (Guidant, Menlo Park, Calif) in 63 patients(8.9%), AneuRx (Medtronic/AVE, Santa Rosa, Calif) in203 patients (28.8%), Excluder (W. L. Gore and Associates,Flagstaff, Ariz) in 25 patients (3.6%), Talent (Medtronic,Sunrise, Fla) in 39 patients (5.5%), and Zenith (Cook,Bloomington, Ind) in 333 patients (47.3%). Other miscel-laneous devices were used with lesser frequency in theremaining 41 patients (5.8%). Patients underwent preoper-ative helical computed tomography (CT) with a specifiedimaging protocol that included 3 mm axial reconstructions.Preoperative angiography and intravascular ultrasoundwere used when length or diameter measurements weredeemed inaccurate on the basis of the CT scan, in thepresence of suspected renal or iliac occlusive disease, orwhen the endograft was placed as part of a clinical trial thatmandated these studies. Three-dimensional CT recon-structions were rarely obtained. When the endovascularrepair was performed as part of a clinical trial, institutionalreview board approval was obtained, and all patients gaveinformed consent. When the procedure was performedwith a commercially available device, patient consent wasobtained, and follow-up adhered to the institutional stan-dard of care, which paralleled most of the clinical trialprotocol. In all cases, postoperative follow-up was rigorous,with strict attention to timing and quality of imagingstudies. Except in patients with contraindications, eg, renalinsufficiency or history of severe allergy to contrast me-dium, postoperative CT scans included non-contrast-en-hanced, contrast-enhanced, and 3-minute to 5-minute de-layed post-contrast-enhanced images. Follow-up studiesincluding four-view plain radiographs and triphase CTscans were obtained at 1, 6, and 12 months and annuallythereafter.

Outcome reporting adhered to the standards outlinedby the Ad Hoc Committee for Standardized ReportingPractices in Vascular Surgery of The Society for VascularSurgery/American Associate for Vascular Surgery (SVS/AAVS).15 Late deaths were classified as aneurysm-related

or aneurysm-unrelated, where aneurysm-related deaths in-cluded those that occurred as a result of aneurysm ruptureor within 30 days of any primary or secondary procedureperformed to treat the aneurysm or complications thereof.Secondary procedures were defined as any procedure, per-cutaneous or open, performed to treat an endograft-relatedproblem, performed after the patient left the operatingroom at the time of initial endograft implantation. Diag-nostic procedures were not included as secondary proce-dures. Examples of secondary procedures included embo-lization of endoleak, additional cuffs and stents placedbecause of migration or endoleak, and open surgical con-version. Device migration was defined when the proximalor distal aspect of the device was observed to have migratedmore than 10 mm relative to anatomic landmarks or a lesserdistance that led to symptoms or required therapy.15 An-eurysm shrinkage or growth was determined on CT scansobtained 3 months or less before the date of the procedure.A pre-discharge imaging study was used as the referencescan when a preoperative study was not available. Graftmigration was determined with the first postoperative scanas a reference. Size measurements were made on the CTimage, with the greatest minor sac dimension on any axialimage (shorter of two diameters when the sac was ellipti-cal), generally found on a cut roughly halfway from thecranial and caudal extent of the aneurysm sac. Aneurysmshrinkage was defined as decrease of 5 mm or more in theminor dimension of the sac; enlargement was defined asincrease of 5 mm or more in the minor dimension.

All binary outcome events were analyzed with theKaplan-Meier method except for outcome measures, with-out any censoring, eg, immediate postoperative parame-ters. Risk at 24 months was specified for all end pointsexcept endoleak, for which 12-month data were substi-tuted because standard error exceeded 10% at 24 months.The log-rank test was used to compare differences betweenKaplan-Meier curves. �2 analysis was used to comparedichotomous variables. Association between baseline vari-ables, ie, age, gender, aneurysm diameter, iliac angulation,iliac diameter and length, and brand of device, and aneu-rysm shrinkage and graft limb occlusion were assessed withstepwise multiple regression analysis, with P � .10 toinclude variables in the model and P � .05 to removevariables. Values are expressed as mean � SE. P � .05(two-tailed test) was considered significant.

RESULTS

There was no significant difference in frequency ofbaseline medical comorbid conditions between genders.Female patients, however, were slightly older (76.7 � 0.7years vs 74.4 � 0.3 years; P � .009), had slightly smalleraneurysms (minor dimension, 5.2 � 0.1 cm vs 5.4 � 0.04cm; P � .033), and had smaller common iliac arteries(diameter, 14.6 � 5.9 mm vs 17.5 � 6.4 mm diameter; P �.024). Among the 704 patients, 30-day mortality rate was1.6% overall, 1.1% in elective cases, and 15% in urgent(symptomatic or ruptured) cases. While the point estimatefor perioperative mortality was higher in female patients,

Table I. Gender distribution by brand of device used

Female Male

Totaln % n %

Ancure 14 22 49 78 63AneuRx 28 14 175 86 203Excluder 2 8.0 23 92 25Talent 2 5.1 37 95 39Zenith 37 11 296 89 333Other* 15 37 26 63 41All 98 14 606 86 704

*Endologix (Irvine, Calif), PowerLink (n � 2, neither in women), AneuRxaortomonoiliac (n � 6, 3 women). Ancure tube graft (n � 10, 3 women).Zenith aortomonoiliac (n � 21, 8 women), homemade (n � 2, 1 woman).

JOURNAL OF VASCULAR SURGERYJuly 200394 Ouriel et al

Page 3: Endovascular aneurysm repair: gender-specific results

the difference did not attain statistical significance (3.1% vs1.3%; P � .197). At mid-term (24 months), survival wassimilar in the two sexes (80% � 2.6% in men, 78% � 8.1% inwomen; P � .239: Fig 1), as was rate of aneurysm-relateddeath (3.1% � 1.3% in men, 3.1% � 1.8% in women; P �.248).

Limb occlusions were observed more often in women,occurring in 11% � 5.2% vs 3.3% � 1.1% at 24 months (P �.022; Fig 2). While there was also higher risk for limbocclusion when an Ancure device was implanted (odds ratio[OR], 3.67; P � .02), gender effect was independent ofdevice brand at multivariable analysis (Table II). There wasno difference in frequency of iliac limb stenting by gender,and size of the introducer sheaths was similar in women andmen. Iliac conduits were used for introduction of the devicein 11 women (11%) and 17 men (2.8%), a difference thatwas highly significant (P � .0004).

Aneurysm rupture was not gender-related, occurring in3 patients after graft implantation, ie, at 4 months in 1woman, 7 months in 1 man, and 19 months in 1 man.Among these, 1 patient had a leaking false aneurysm oppo-

site a renal orifice, possibly from stent erosion; 1 patient hadtype III separation of an aortic extender cuff and the mainbody; and 1 patient had distal type I endoleak when an iliaclimb pulled out from its attachment site and into theaneurysm sac. Conversion to open surgical repair was infre-quent, occurring in 3.9% � 1.5% of men and 3.8% � 2.7%of women at 24 months (P � .860). Migration of theendograft, defined with SVS/AAVS criteria,15 was ob-served in 7.6% � 2.0% of men and 5.4% � 3.2% of womenat 24 months of follow-up (P � .649). Secondary proce-dures were required in a similar percentage of men andwomen, 24% � 2.9% and 21% � 6.3%, respectively, at 24months (P � .882), despite the higher rate of secondaryrevascularization procedures (thrombolysis, thrombec-tomy, femoral-femoral bypass) because of graft limb occlu-sion in women.

Endoleak of any variety was observed in 30% � 2.4% ofmen and 35% � 7% of women at 12 months, a differencethat did not attain statistical significance (P � .358; Fig 3).Similarly, there were no significant gender-specific differ-ences in rate of type II endoleak (P � .697), 24% � 2.3% inmen and 29% � 6.8% in women at 12 months (Fig 4).Device-related endoleak (type I or III) also occurred in acomparable number of men and women (P � .218), 5.8%� 1.2% vs 7.9% � 3.2% at 12 months, respectively (Fig 5).There were no gender differences in frequency of type I leak(2.5% � 0.7% in men, 2.8% � 2.0% in women at 12months; P � .604) or type III leak (3.3% � 1.0% in men,5.3% � 2.7% in women at 12 months; P � .245) whenanalyzed separately.

Despite trends toward an increase in number of en-doleaks in female patients, aneurysm shrinkage was signifi-cantly greater when compared with that in male patients(Fig 6). At 24-month follow-up a reduction of 5 mm ormore in sac diameter was observed in 76% � 8.1% ofwomen, compared with only 57% � 3.5% of men (P �.019). Multivariable analysis of the binary outcome of sacshrinkage excluded gender differences in smaller sac dimen-sion (major or minor axis) or advanced age as an explana-

Fig 1. Survival in male and female patients.

Fig 2. Graft limb occlusion in male and female patients.

Table II. Multivariate analysis for limb occlusion*

Variable Coefficient

95%confidence

interval (�) P

Gender �0.0749 0.0613 .02Age 0.008 0.0023 .51Sac diameter �0.0102 0.0227 .38Sac length 0.0003 0.0012 .59Angulation (sac-right iliac) 0.0003 0.0011 .56Angulation (sac-left iliac) �0.0006 0.0011 .29Right iliac diameter 0.0027 0.0039 .17Right iliac length 0.0003 0.0014 .69Left iliac diameter 0.0030 0.0041 .15Left iliac length �0.0003 0.0015 .67Sheath size 0.0060 0.0087 .18Device 0.0652 0.0544 .02

*Only female gender and type of device (Ancure) were associated with limbocclusion.

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tion for increased rate of shrinkage in women. Frequency ofsac shrinkage was attenuated with increasing age (OR,0.994 � 0.004 per year of incremental age; P � .001).Moreover, while there were differences in gender distribu-tion by brand of device (P � .0002), these differences werenot correlated with sac shrinkage. Devices associated withthe greatest amount of shrinkage (Talent and Zenith, datanot shown) were less commonly implanted in female pa-tients. Differences in frequency of aneurysm enlargementafter repair (5 mm or more in sac diameter), while appear-ing to occur more frequently in men over long-term fol-low-up (Fig 7), did not approach statistical significance (P� .769).

DISCUSSION

Eligibility for transfemoral treatment of infrarenal aor-tic aneurysms depends, in part, on the ability to safelydeliver the endovascular device to its intended target loca-

tion. Thus the procedure relies on both adequate size andquality of the external and common iliac vessels. Whereassize of the access vessels is usually acceptable in malepatients, female patients often have smaller iliac arteries,which may preclude an endovascular option.7-9 The obser-vation of a lower eligibility rate for women versus menundergoing screening for endovascular repair of AAA16 iscompounded by gender-bias against repair of aneurysms infemale patients.4,17 While the prevalence of AAA in male tofemale patients is approximately 2.5:1, men appear morelikely to undergo open surgical aneurysm repair by a ratio ofalmost 2:1,4 accounting for the commonly observed 15% to20% female proportion of patients undergoing surgicalrepair of AAA. The proportion of female patients is evenlower when endovascular repair is undertaken, rangingbelow 10% in many series.14,18 We have not observed sucha discrepancy at our institution; women underwent 14% of

Fig 3. Freedom from endoleak of any type in male and femalepatients.

Fig 4. Freedom from type II endoleak in male and female patients.

Fig 5. Freedom from device-related endoleak, type I or type III.

Fig 6. Frequency of aneurysm sac shrinkage, expressed as propor-tion without sac shrinkage of 5 mm or more, in male and femalepatients.

JOURNAL OF VASCULAR SURGERYJuly 200396 Ouriel et al

Page 5: Endovascular aneurysm repair: gender-specific results

endovascular AAA repairs in the present series and 13% in arecently reported 10-year open surgical experience.19 Not-withstanding, previous investigations directed at discerningoutcome differences between male and female patientsreceiving endografts have included only 26 women in onereport11 and only 7 women in another.10 These issuesexemplify the dearth of information on gender-specificoutcome and were the motivation behind the current in-vestigation.

The present series documents important differences indemographic features of men and women undergoing en-dovascular repair. Women were older than men, a findingreported by others.2,10,11 Women had slightly smaller an-eurysms at repair, another observation previously report-ed.2,10 Like many studies of open surgical and endovasculartreatment of AAA,10,11,19,20 we were unable to document astatistically significant increase in mortality among femalepatients. Similar to previous studies, however, the numberof female patients in the present study may have compro-mised detection of a significant difference. Although oursample size of almost 100 female patients was appreciablygreater than that of previous studies, risk for type II errorremained sizeable.

Complications such as migration, device-related en-doleak, aneurysm rupture, and need for secondary proce-dures or open surgical conversion occurred with similarfrequency in male and female patients. Limb occlusion,however, was observed with significantly higher frequencyin women. While this finding may be related to the smallersize of access arteries and associated risk for traumaticdissection, multivariate analysis did not identify iliac diam-eter as an independent risk factor for limb occlusion. Aswell, the cumulative incidence of limb occlusion continuesto diverge after the first year, suggesting that factors otherthan acute dissection-induced thrombotic occlusion maybe important. Progressive intimal hyperplasia at the site ofvascular injury sustained at the time of implantation, differ-ences in gender-related thrombotic tendencies, or anothercause may explain these late findings. The observed reduc-tion in patency of endograft limbs is reminiscent of theobservation of reduced infrainguinal graft patency in wom-en.1,21

In the EUROSTAR experience, endoleak was 1.7 timesmore likely to develop in women compared with men afterendovascular AAA repair.18 Although we did not evaluateproximal aortic neck length in this study, other series havenoted a shorter proximal aortic neck length in women.10,11

While we did not observe a statistically significant increasein rate of endoleak in women, the point estimate trendedhigher in female patients for types I, II, and III endoleak.Surprisingly, this trend did not translate into a reduced rateof aneurysm sac shrinkage. Rate of shrinkage was signifi-cantly greater in female patients than in male patients, afinding unique to the present series. Multivariate analysisdid not demonstrate that increased shrinkage was a result ofgender difference in baseline sac diameter or patient age.Consequently, increased rate of sac shrinkage in female

patients remains unexplained, and the observation warrantsadditional study.

In summary, women comprise a small minority ofpatients undergoing endovascular aneurysm repair.Women undergoing endovascular AAA repair are slightlyolder and their aneurysms are smaller when compared withmen. Although overall results are similar to those observedamong men, problems with access requiring iliac conduitsand a higher risk for early and late graft limb thrombosisshould be anticipated in women undergoing endovascularaneurysm repair. Most important, however, are the obser-vations that similar perioperative mortality and long-termsurvival, as well as more rapid aneurysm sac shrinkage, inwomen suggest that endovascular treatment of AAA shouldbe offered to suitable candidates irrespective of gender.

REFERENCES

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2. Johnston KW. Influence of sex on the results of abdominal aorticaneurysm repair. Canadian Society for Vascular Surgery AneurysmStudy Group. J Vasc Surg 1994;20:914-23.

3. Lawrence PF, Gazak C, Bhirangi L, Jones B, Bhirangi K, Oderich G, etal. The epidemiology of surgically repaired aneurysms in the UnitedStates. J Vasc Surg 1999;30:632-40.

4. Katz DJ, Stanley JC, Zelenock GB. Gender differences in abdominalaortic aneurysm prevalence, treatment, and outcome. J Vasc Surg1997;25:561-8.

5. Norman PE, Semmens JB, Lawrence-Brown MM, Holman CD. Longterm relative survival after surgery for abdominal aortic aneurysm inwestern Australia: population based study. BMJ 1998;317:852-6.

6. Starr JE, Hertzer NR, Mascha EJ, O’Hara PJ, Krajewski LP, SullivanTM, et al. Influence of gender on cardiac risk and survival in patientswith infrarenal aortic aneurysms. J Vasc Surg 1996;23:870-80.

7. Lederle FA, Johnson GR, Wilson SE, Gordon IL, Chute EP, LittooyFN, et al. Relationship of age, gender, race, and body size to infrarenalaortic diameter. The Aneurysm Detection and Management (ADAM)Veterans Affairs Cooperative Study Investigators. J Vasc Surg 1997;26:595-601.

Fig 7. Frequency of aneurysm sac enlargement, expressed asproportion without sac enlargement of 5 mm or more, in male andfemale patients.

JOURNAL OF VASCULAR SURGERYVolume 38, Number 1 Ouriel et al 97

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8. Sandgren T, Sonesson B, Ahlgren R, Lanne T. The diameter of thecommon femoral artery in healthy human: influence of sex, age, andbody size. J Vasc Surg 1999;29:503-10.

9. Ouriel K, Green RM, Donayre C, Shortell CK, Elliott J, DeWeese JA.An evaluation of new methods of expressing aortic aneurysm size:relationship to rupture. J Vasc Surg 1992;15:12-8.

10. Velazquez OC, Larson RA, Baum RA, Carpenter JP, Golden MA,Mitchell ME, et al. Gender-related differences in infrarenal aortic aneu-rysm morphologic features: issues relevant to Ancure and Talent en-dografts. J Vasc Surg 2001;33(2 suppl):S77-84.

11. Wolf YG, Arko FR, Hill BB, Olcott C, Harris EJ Jr, Fogarty TJ, et al.Gender differences in endovascular abdominal aortic aneurysm repairwith the AneuRx stent graft. J Vasc Surg 2002;35:882-6.

12. Abu-Ghaida AM, Clair DG, Greenberg RK, Srivastava S, O’Hara PJ,Ouriel K. Broadening the applicability of endovascular aneurysm repair:the use of iliac conduits. J Vasc Surg 2002;36:111-7.

13. Vallabhaneni SR, Harris PL. Lessons learnt from the EUROSTARregistry on endovascular repair of abdominal aortic aneurysm repair.Eur J Radiol 2001;39:34-41.

14. Carpenter JP, Baum RA, Barker CF, Golden MA, Velazquez OC,Mitchell ME, et al. Durability of benefits of endovascular versus con-ventional abdominal aortic aneurysm repair. J Vasc Surg 2002;35:222-8.

15. Chaikof EL, Blankensteijn JD, Harris PL, White GH, Zarins CK,

Bernhard VM, et al. Reporting standards for endovascular aortic aneu-rysm repair. J Vasc Surg 2002;35:1048-60.

16. Carpenter JP, Baum RA, Barker CF, Golden MA, Mitchell ME,Velazquez OC, et al. Impact of exclusion criteria on patient selection forendovascular abdominal aortic aneurysm repair. J Vasc Surg 2001;34:1050-4.

17. Evans SM, Adam DJ, Bradbury AW. The influence of gender onoutcome after ruptured abdominal aortic aneurysm. J Vasc Surg 2000;32:258-62.

18. Buth J, Laheij RJ. Early complications and endoleaks after endovascularabdominal aortic aneurysm repair: report of a multicenter study. J VascSurg 2000;31(1 Pt 1):134-46.

19. Hertzer NR, Mascha EJ, Karafa MT, O’Hara PJ, Krajewski LP, BevenEG. Open infrarenal abdominal aortic aneurysm repair: The ClevelandClinic experience from 1989 to 1998. J Vasc Surg 2002;35:1145-54.

20. Starr JE, Hertzer NR, Mascha EJ, O’Hara PJ, Krajewski LP, SullivanTM, et al. Influence of gender on cardiac risk and survival in patientswith infrarenal aortic aneurysms. J Vasc Surg 1996;23:870-80.

21. Henke PK, Proctor MC, Zajkowski PJ, Bedi A, Upchurch GR Jr,Wakefield TW, et al. Tissue loss, early primary graft occlusion, femalegender, and a prohibitive failure rate of secondary infrainguinal arterialreconstruction. J Vasc Surg 2002;35:902-9.

Submitted Oct 9, 2002; accepted Dec 19, 2002.

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JOURNAL OF VASCULAR SURGERYJuly 200398 Ouriel et al