Endovascular versus medical management of type B intramural hematoma: a meta-analysis
Systematic Review

Endovascular versus medical management of type B intramural hematoma: a meta-analysis

Adam Chakos1,2, Tisha Twindyawardhani1, Arturo Evangelista3,4, Giuliana Maldonado3, Gabriele Piffaretti5, Tristan D. Yan1,2,6, David H. Tian1,2,7

1The Collaborative Research (CORE) Group, 2Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia; 3Servei de Cardiologia, Hospital Vall d’Hebron, VHIR, CIBER-CV, Barcelona, Spain; 4Instituto del Corazón, Quironsalud Teknon, Barcelona, Spain; 5Department of Medicine and Surgery, University of Insubria School of Medicine, ASST Settelaghi Circolo University Teaching Hospital, Varese, Italy; 6Department of Cardiothoracic Surgery, Royal Prince Alfred Hospital, Sydney, Australia; 7Royal North Shore Hospital, Sydney, Australia

Correspondence to: Adam Chakos. The Collaborative Research (CORE) Group, Macquarie University, Sydney, Australia. Email: adam.chakos@outlook.com.

Background: Aortic intramural hematoma constitutes one of the three classifications of acute aortic syndrome (AAS). Type B intramural hematoma (IMH-B) is localized to the descending thoracic aorta and can be managed through medical, endovascular or surgical means. Data comparing contemporary management with thoracic endovascular aortic repair (TEVAR) versus traditional medical management (MM) is sparse and only moderate strength recommendations for TEVAR are provided in guidelines. This meta-analysis aimed to pool available data from comparative studies between TEVAR and MM and examine differences in outcomes.

Methods: Literature search of electronic medical databases was conducted to identify studies comparing TEVAR and MM for management of IMH-B. Data extraction from studies fulfilling the inclusion criteria was performed by two authors and meta-analysis using a random-effects model applied to pool baseline data and examine risk ratios (RR) for management outcomes.

Results: Of the initial 2,349 studies, nine studies were identified for analysis. There were 161 TEVAR patients and 166 who were medically managed. The mean age of the cohort was 62.2 years [95% confidence interval (CI): 55.8–68.7 years]. Patients with complicating features of IMH-B at presentation were more likely to appear in the TEVAR group, with more penetrating atheromatous ulcer (PAU) [risk difference (RD), 0.565, 95% CI: 0.240–0.889, P=0.001], ulcer-like projection (ULP) (RD 0.240, 95% CI: 0.965–0.384, P=0.001), and greater IMH size (mean difference, MD 5.47 mm, 95% CI: 0.320–10.6, P=0.037). There was no statistical difference between TEVAR and MM for the primary endpoints of aortic-related death (RR 0.535, 95% CI: 0.191–1.5, P=0.234) or IMH-B regression (RR 1.25, 95% CI: 0.859–1.81, P=0.246). Of the secondary endpoints, TEVAR had both significantly less dissection during follow-up (RR 0.295, 95% CI: 0.0881–0.989, P=0.048) and less rupture during follow-up (RR 0.206, 95% CI: 0.0462–0.921, P=0.039).

Conclusions: A small number of series comparing TEVAR and MM for management of IMH-B are available and random-effects meta-analysis did not reveal any statistically significant difference between treatments for aortic related death or IMH-B regression at a mean follow-up of 37 months. TEVAR was found to be associated with lower risk of dissection and lower risk of rupture during follow-up. Baseline data meta-analysis showed patients with complicating features of PAU, ULP, and larger IMH size were more likely to be managed with TEVAR.

Keywords: Intramural hematoma; type B; thoracic endovascular aortic repair (TEVAR); medical management


Submitted Jun 11, 2019. Accepted for publication Jun 24, 2019.

doi: 10.21037/acs.2019.06.11


Introduction

Aortic intramural hematoma (IMH) is defined by hemorrhage within the aortic media and is one of the three subtypes of acute aortic syndrome (AAS) (1,2). Aortic dissection comprises around 85–95% of AAS, with IMH making up 5–15% and penetrating atheromatous ulcer (PAU) around 5%. Traditionally, IMH has been attributed to rupture of the vasa vasorum, however, improvements in imaging and reporting have led to conclusions that true lumen communication via micro-intimal tears may also be causative (3,4). Complicated cases of type B intramural hematoma (IMH-B) are defined by ongoing pain, increasing diameter of the lesion or presence of ulcer-like projections (ULP) (5).

IMH is classified according to the Stanford type A and B system for aortic dissection, with IMH-A originating in the ascending aorta and IMH-B originating in the descending aorta. Management is typically derived from that for aortic dissection and while class I recommendations exist for surgical treatment of IMH-A, only class IIa (moderate) recommendations exist for the management of IMH-B, which can consist of medical management alone or with the addition of thoracic endovascular aortic repair (TEVAR) (6,7).

While single-armed institutional reports of medical or endovascular management of IMH-B have been published, few comparative series are available in the literature. Given uncomplicated IMH-B lesions can progress to complicated lesions, some centers prefer broad application of TEVAR, citing it as a relatively low-risk technique (8,9) that would benefit both complicated and uncomplicated IMH-B (10,11). Other centers prefer to use TEVAR as a second-line option after medical management (7,12). The objective of this study was to use data from comparative studies to examine potential differences in outcomes for IMH-B treated with medical management (MM) versus endovascular therapy (TEVAR).


Methods

Literature search

The electronic medical databases Medline, Embase and PubMed were queried from dates of inception until December 2018. The terms (“intramural hematoma” OR “intramural haematoma” OR “IMH”) OR ((“aorta” OR “aortic”) AND (“hematoma” OR “haematoma”)) AND (“endovascular” OR “medical treatment” OR “endoluminal” OR “medical therapy” OR “medical management”), were used.

Literature search of the results and subsequent data collection from original studies comparing medical and endovascular management in type B IMH was performed independently by two researchers (A Chakos and T Twindyawardhani), with differences in results resolved by consensus. Inclusion criteria were studies reporting primary comparative data between medically-managed and TEVAR-managed IMH-B with at least 10 patients per treatment arm. Animal studies, reviews, case-reports, editorials and conference abstracts were excluded. Studies with pooled results for outcomes of medical management and endovascular treatment results were also excluded. A PRISMA diagram detailing the literature search is provided (Figure S1).

Figure S1 PRIMSA flow chart detailing the literature search process for management of intramural hematoma type B-endovascular versus medical management. IMH-B, type B intramural hematoma.

Primary endpoints included aortic-related death and IMH-B regression. Aortic-related death was defined as death attributable to an aortic cause during the initial admission or follow-up, and IMH-B regression was defined as a reduction in IMH size. Secondary endpoints included early death (in-hospital or 30-day), follow-up requirement for secondary intervention [after the initial admission period, defined as two weeks from presentation (10,12)], follow-up dissection, and follow-up rupture. Secondary endpoints were evaluated where they were reported by half of the included studies.

Quality analysis

Individual study quality appraisal was completed using a 19-point metric based on the Canadian Institute of Health Economics quality analysis (13). The metric examined domains including study design, how completely study populations were described, clarity provided for interventions, and completeness of outcome and follow-up reporting. Total scores were then tallied and where included, studies scoring 10 or below were graded as standard quality, those scoring 11–13 were graded moderate quality, and those scoring 14–19 were graded as high quality.

Treatment definitions

Medical management protocols varied between institutions but typically included administration of various antihypertensive agents and management of pain, as per the Class I recommendations of the European Society of Cardiology (ESC) guidelines (6,8,12). TEVAR was typically indicated in complicated cases of IMH-B; IMH expansion (despite medical therapy), impending rupture, uncontrolled hypertension, end-organ damage, refractory pain, or development of an intimal tear on CT (3,6,7,14).

Where MM patients received TEVAR after admission, this was defined as a secondary intervention where it occurred outside the acute phase, defined as two weeks after presentation (10,14).

Intramural hematoma regression was defined as a reduction in the size of the hematoma (7,12). Complete aortic remodeling was reported in addition to IMH-B regression in some studies (7,10,12,14).

Statistical analysis

Data from included studies was extracted by two independent researchers (A Chakos and T Twindyawardhani). Where data was expressed as median and interquartile range, it was converted to mean and standard deviation using the methods of Wan et al. (15) to allow for pooling. Pooling was performed using meta-analysis of proportions or means. Differences in baseline data were summarized as risk difference and mean difference for proportion and continuous data, respectively, with 95% confidence intervals (95% CI) provided.

Outcomes for medical management and TEVAR cohorts were compared and risk ratios (RR) calculated with 95% confidence intervals. A random effects model was applied for all analyses to account for between-study variance that would be inevitable with patient selection, procedural, and care differences not accounted for in institutional series. Studies with zero-event outcomes in both arms were not weighted in meta-analysis.

Publication bias was examined with funnel plots and also by Egger’s test. Heterogeneity amongst studies was assessed using the I2 statistic, with consideration of I2 confidence intervals (16). Potential sources of heterogeneity were explored, including with the aid of an L’Abbe plot, Baujat plot, and a leave-one-out sensitivity analysis conducted to identify studies contributing most to heterogeneity and inconsistency of effect measure (17).

Two-tailed P values <0.05 were deemed as significant. All statistics were performed with R [R Foundation for Statistical Computing, Vienna, Austria (18)].


Results

Literature search identified 2,476 records from which 289 full-text articles were reviewed: 9 studies were found to fit the inclusion criteria (PRISMA diagram Figure S1) (7-12,14,19,20). The nine comparative studies contained 327 patients with IMH-B, 166 treated with medical management alone, and 161 treated with TEVAR. Mean follow-up was 37.3 months, 95% CI: 29.0–45.5], reported for n=279 patients. Study quality was assessed as high for 5 studies, moderate for 2 studies, and standard for 2 studies (Table S1).

Table S1
Table S1 Study details
Full table

Overall patient cohort mean age was 62.2 years (95% CI: 55.8–68.7 years), with 67% males (95% CI: 61.0–72.5). Where reported, the majority of patients presented with hypertension (86%, 95% CI: 75.2–92.6%) and symptomatically (93%, 95% CI: 83.1–97.3%).

Comparison of baseline risk data between groups (Table 1) showed TEVAR patients had a higher prevalence of PAU (risk difference, RD 0.565, 95% CI: 0.240–0.889, P=0.001), ulcer like projection (RD 0.240, 95% CI: 0.097–0.384, P=0.001), and greater mean IMH size (mean difference, MD 5.47, 95% CI: 0.320–10.6, P=0.037). However, of those in the TEVAR group, PAU and ULP were not present in at least 50% of cases. Risk and mean difference for other baseline risk parameters did not reach statistical significance (baseline risk data from individual studies is reported in full in Table S3).

Table 1
Table 1 Baseline data for pooled patient cohort. Between-group heterogeneity statistic and P value for risk difference and mean difference (as appropriate) is included. Full details in Table S2
Full table
Table S2
Table S2 Baseline data for pooled patient cohort. Groups are compared using risk difference and mean difference with heterogeneity statistic and confidence interval included
Full table
Table S3
Table S3 Patient presentation and baseline risk data
Full table

Intraoperative data was only reported for 3 studies (7,8,10) and is presented in Table S4. The paucity of intraoperative data precluded pooling.

Table S4
Table S4 Intraoperative data (where reported)
Full table

There was no statistically significant difference between TEVAR and MM groups for the primary endpoints of aortic-related death (RR 0.535, 95% CI: 0.191–1.5], P=0.234) or IMH-B regression (RR 1.25, 95% CI: 0.859–1.81, P=0.246; Figure 1, Table 2). IMH-B regression data was collected as distinct from “complete aortic remodeling”, which some studies additionally reported (7,10,12,14).

Figure 1 Relative risk/risk ratio for primary endpoints of aortic-related death and IMH-B regression. IMH-B, type B intramural hematoma.
Table 2
Table 2 Primary and secondary end point data
Full table

Of the secondary endpoints (Table 2), TEVAR patients had significantly less dissection (RR 0.295, 95% CI: 0.088–0.989, P=0.048; Figure 2) and less rupture during follow-up (RR 0.206, 95% CI: 0.046–0.921, P=0.039; Figure 2). There was no significant difference in early death or requirement for second intervention (Figures S2,S3). Individual study endpoint data is presented in Table S5.

Figure 2 Relative risk/risk ratio for secondary endpoints reaching significance: follow-up aortic dissection and follow-up aortic rupture.
Figure S2 Secondary endpoint of early death (in-hospital or 30-day mortality).
Figure S3 Secondary endpoint of requirement for second intervention (after index medical management or TEVAR procedure). TEVAR, thoracic endovascular aortic repair.
Table S5
Table S5 Outcomes for primary and secondary endpoints. Data reported as fractions where number followed-up was given
Full table

Heterogeneity was low for most endpoints, except for IMH regression: I2=92%, and requirement for second intervention: I2=65%. However, generalisability of results may remain limited as some endpoints were incompletely reported across studies and some I2 confidence intervals were wide (Table S2).

Funnel plots were visually inspected for asymmetry as a measure of publication bias and Egger’s test was applied (Figures S4,S5). The Egger’s test null hypothesis of plot symmetry (i.e., publication bias not likely to be present) was not rejected for any outcome, however, visual inspection suggested asymmetry for the co-primary endpoint of IMH-B regression.

Figure S4 Funnel plot and results of Egger’s test to examine for publication bias for the primary endpoint of aortic-related death. Egger’s test indicates that the null hypothesis of symmetry cannot be rejected given P>0.05. Note that zero event studies are not included.
Figure S5 Funnel plot and results of Egger’s test to examine for publication bias for the primary endpoint of IMH-B regression. Egger’s test indicates that the null hypothesis of symmetry cannot be rejected given P>0.05. Note that zero event studies are not included. IMH-B, type B intramural hematoma.

Discussion

This meta-analysis pooled results from nine institutional series comparing endovascular and medical management alone in the treatment of type B aortic intramural hematoma. Meta-analysis showed no statistically significant difference between TEVAR and MM for the primary endpoints of aortic-related death or IMH-B regression. Aortic dissection at follow-up and aortic rupture at follow-up was significantly reduced in the TEVAR group. Baseline data was incompletely reported but where reported, pooling showed the majority of patients treated for IMH-B were hypertensive and symptomatic at presentation. Patients in the TEVAR group had a statistically significantly greater prevalence of PAU and ULP at baseline, as well as greater IMH size, though PAU and ULP were not present in at least 50% of patients managed with TEVAR.

Results from the current study are consistent with single-arm reviews conducted in consensus statements and guidelines (5,6,21). An interdisciplinary consensus statement on the management of IMH-B and PAU reviewed 18 publications to find that the 30-day mortality for IMH-B was 3.9%, and 4.6% and 3.4% for TEVAR and MM respectively (5). These acute phase mortality results support those from the present analysis for total, TEVAR, and MM cohorts; 3.8%, 4.1% and 3.6%, respectively. Clear results for aortic-related mortality in individual TEVAR and MM groups at follow-up were not available from other studies for comparison.

The follow-up dissection rate of 10.0% (95% CI: 6.49–15%) in this meta-analysis is consistent with the 3–14% conversion rate to aortic dissection cited by the review in the most recent ESC guidelines (21). Additionally, findings from the present analysis of significantly lower risk of dissection and rupture at follow-up with TEVAR add weight to the conclusions of individual studies attributing low rates of adverse aortic events at follow-up and favorable aortic remodelling to TEVAR management (8,9,12,20). However, some studies found higher rates of dissection and secondary intervention occurred with TEVAR (7). Hence, TEVAR should be applied in the context of considered clinical and radiological findings and with an eye to the possibility of technical challenges and complications of endovascular therapy in a potentially fragile vessel.

While guidelines agree that initial medical therapy under careful surveillance to control aortic wall stress is indicated in all IMH-B (5,6,21,22), the role for TEVAR is less clear. A 2010 multi-disciplinary group guideline (including the American Heart Association and the Society of Thoracic Surgeons) recommends treatment of IMH-B as per aortic dissection of the same segment (level IIa recommendation) (21). However, the 2010 ESC guidelines are more specific, advising TEVAR should be considered (level IIa recommendation) for IMH-B complicated by recurrent pain, expansion, periaortic hematoma, and/or intimal disruption (6). A 2014 interdisciplinary expert-panel consensus statement on treatment of IMH-B also recommends TEVAR for complicated IMH-B in the acute phase and provides a broader definition of complicated lesions, including those associated with persistent chest pain, hemodynamic instability, periaortic hemorrhage, presence of ULP, diameter >55 mm, and/or rapid expansion (5). The results of the present analysis did not find a significant difference in late aortic death between TEVAR and medical management, reflecting the guideline level II recommendations of consideration, rather than clear indication, for TEVAR in complicated IMH-B.

This review is limited by several factors. Firstly, relatively few studies contain detailed TEVAR data, with comparative studies even more scarce in the literature (5,8). Randomized trials are not available, and for the most part, included comparative studies were single-center, retrospective series, with only one multicentre study (8) and three prospective studies (7,9,11). This lack of RCTs means that patient selection for TEVAR or MM introduces a likely source of bias, as sicker patients may have been confined to non-operative management, while more complex IMH typically appeared in the TEVAR group. Heterogeneity of lesions within cohorts is acknowledged as a difficulty of collating the available data for IMH-B (8), however, the present analysis found that heterogeneity point estimates in pooled baseline data and outcomes were typically low-moderate but this should be considered in the context of often wide I2 confidence intervals. Forest plots of outcome data show there were outlying studies for some outcomes, however, careful review of outlying studies revealed no reason for their exclusion, nor did sensitivity analysis demonstrate any change in overall findings of statistical significance.


Conclusions

Meta-analysis of nine studies containing 161 TEVAR patients and 166 medically managed patients for IMH-B did not find a significant difference in aortic-related death and IMH-B regression. TEVAR was associated with a significantly reduced risk of aortic dissection or aortic rupture during the same follow-up. Patients with complicating features of PAU, ULP and greater IMH size were more likely to be managed with TEVAR.


Expert opinion: unlocking the mystery of type B IMH treatment

Evangelista, Maldonado

Over the last 20 years, IMH of the aorta has become increasingly recognized as a pathologic entity distinct from aortic dissection. Despite better understanding of this disease, a consensus of optimal management strategies has not yet been established. One aspect of IMH that confounds attempts to set indications for intervention is the significant dynamic changes in the morphologic appearance of aortic IMH. Thus, depending on the exact time after symptom onset an imaging “snapshot” is taken, the findings may be interpreted differently from those obtained only hours before or after the present study. Although this meta-analysis found no differences in survival of patients with type B IMH treated medically or by TEVAR, those treated by the latter had both significantly less dissection and aortic rupture during follow-up. Logically, patients with complicating features of IMH-B at presentation were more frequent in the TEVAR group which included more PAU, ulcer-like projections and larger IMH size. Several studies have shown that IMH evolves with aorta dilation or aortic dissection in at least 50% of cases. Some of the current predictive factors of disease progression are: associated ulcer or intimal erosion in the acute phase, maximum aortic diameter ≥50 mm on initial CT scan, persistent pain, progressive maximum aortic wall thickness and enlarging aortic diameter. In some studies of this meta-analysis, clinical and imaging predictors of complications were not homogeneously considered. This point is crucial in a disease where 40% of cases evolve with no clinical complications and complete IMH regression without aorta dilation. Thus, although the cumulative risk of a conservative management policy is not clearly defined for uncomplicated type B IMH, there exists no clear advantage over an operative strategy. Most notably, a penetrating aortic ulcer in an acutely-symptomatic patient or an unstable or enlarging distal ulcer associated with type B IMH should be treated more aggressively. Acute focal intimal disruptions, whether due to atherosclerotic ulcers or not, should be considered for TEVAR. Subacute or chronic focal intimal disruptions may be treated more conservatively. IMH with tiny intimal disruption should, however, be followed closely in the first year after onset, as they may progress to focal intimal disruptions. As the mechanical properties of IMH change during follow-up, the timing of TEVAR has implications for the environment in which the stent-graft is deployed. The convenience of sealing completely within an intramural hematoma should be carefully considered given the potentially higher risk of retrograde type A dissection, especially during the acute phase. Further research is necessary and should focus on providing a stratified risk model coupled with a natural history assessment. In the meantime, uncomplicated type B IMH are optimally treated with medical management and TEVAR is reserved for patients with complications and requires an experienced team who can identify patient-specific challenges that increase the risk of the procedure.


Expert opinion: the Devil hides in the details

Piffaretti

Systematic review and meta-analysis effectively summarize what the available literature offers in terms of “daily practice” in the “real world”. One of the most interesting points in this study is the absence of significant difference between best medical treatment (BMT) and TEVAR regarding aortic-related mortality or acute IMH-B regression.

Interpreting numbers into clinical scenarios is sometimes debatable; the glass can be seen as half-full or half-empty. First, in previous personal experience, IMH-B has demonstrated an unpredictable, rapid evolution characterized by lesion progression and ulcer-like appearanace in 47% of cases receiving BMT alone (23). In this meta-analysis, Chakos et al. pointed out that 50% of the cases of IMH-B which underwent TEVAR had no ulcer-like projection, but this means the other 50% did and this has been reported to be a significant predictor for late aortic events (24). Secondly, the fact that TEVAR was associated with fivefold less risk of rupture during follow-up supports its potential positive effect on one of the most important aims of TEVAR, which is preventing aortic rupture. Nonetheless, in those patients treated by TEVAR because of rapid progression with/without ulcer-like projection appearance, it is impossible to demonstrate if, left without TEVAR, they would have developed an aortic event requiring urgent surgery. Last but not least, TEVAR was associated with a trend toward reduced need for (re)intervention if compared to BMT (however, this finding did not quite reach the threshold for significance: RR 0.31; 95% CI: 0.07–1.45, P=0.14).

Although IMH-B is one pathology of the original triad identified as acute aortic syndrome two decades ago, and despite IMH-B generating a lot of interest across cardiovascular disciplines, currently, evidence does not allow for clear-cut decisions-people must ultimately make them based on clinical experience. Considering the unpredictable behavior and the available results of a selective approach with TEVAR, clinical and morphological details may play a decisive role in surgical decision-making process.


Acknowledgments

None.


Footnote

Conflicts of Interest: The authors have no conflicts of interest to declare.


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Cite this article as: Chakos A, Twindyawardhani T, Evangelista A, Maldonado G, Piffaretti G, Yan TD, Tian DH. Endovascular versus medical management of type B intramural hematoma: a meta-analysis. Ann Cardiothorac Surg 2019;8(4):447-455. doi: 10.21037/acs.2019.06.11

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