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Comparison of Transradial Versus Transfemoral Approach for Coronary Angiography and Percutaneous Coronary Intervention

Azraai M Ajani AE

DOI : https://doi.org/10.31546/JCCCVT.1003

Download Article : Peer-reviewed Article PDF

Historically, transfemoral approach (TFA) was the main access site for percutaneous coronary procedure. Over the past decade, transradial approach (TRA) has been gaining popularity over (TFA). With frequent use of TRA, we have recognized the advantage of TRA over TFA. Multiple trials have been conducted to investigate TRAs’ benefits and risk. We have performed a literature search on TRA vs TFA, on the advantages and disadvantages of both approaches. A total of 140 citations were identified but only 38 filled our eligibility criteria.
In this review, we found that TRA is associated with reduction of access site complication, time to ambulation and cardiac related death. However, lack of training and hesitancy of older interventionalist to switch approach is an impediment to the increased use of TRA. While the transfemoral approach has a higher access site complication rate, it is still integral as an access option.

Keywords: Transradial , Transfemoral , Percutanous coronary intervention.

Percutaneous coronary intervention has revolutionized the field of cardiology and has become the cornerstone of  management of ischaemic heart disease (1, 2). Historically, coronary angiography and intervention has been commonly performed via the common femoral artery (3). However, this procedure is associated with bleeding complications, exacerbated by advances in aggressive periprocedural pharmacotherapy (4). New technological advancements such as reduction in size of interventional devices and the introduction of vascular closure devices have reduced the incidence of major bleeding, but major complications still occur (5-8).
Campeau was the first to introduce coronary angiography via the transradial approach (through the forearm) in 1989 (9). Several early studies reported a significant reduction in vascular complication with transradial approach compared with the transfemoral approach (10-13). These studies raised interest in the transradial access site as a viable and attractive alternative to femoral access (14, 15).

Materials and Methods
Relevant studies were identified by searching the following data sources – Medline via Ovid, Embase, Cochrane Library and using the ‘related citation’ search tool in PubMed. Reference lists from identified studies were also scanned to identify any other relevant studies.
The following inclusion criteria were used:
(i) studies comparing patients undergoing transfemoral or transradial approach (ii) comparison of outcome, benefit and risk between the two approaches. Meta analyses and systemic review were also included in this review. Duplicate publications were excluded.
The search strategy identified 155 citations. 25 studies were duplicates and after screening of titles and abstracts, a further 83 studies were included. Of the 83 studies selected, 47 fulfilled out eligibility criteria and are included in this systematic review.
Results and Discussion
The Radial Versus Femoral Access for Coronary Angioplasty and Intervention in Patients with Acute Coronary Syndromes (RIVAL) study set out to determine whether radial access was superior to femoral access. This study demonstrated that transradial procedure were associated with a 60% reduction in vascular complications (especially in women) when compared with femoral approach, but showed no significant difference in rates of death, MI, stroke, or major bleed (16, 17).
Minimizing Adverse Haemorrhagic Events by Transradial Access Site and Systemic Implementation of AngioX (MATRIX) trial compared transradial versus transfemoral approach in patients with ACS. The  study showed no reduction in rates of MI, stroke, or major bleeding at 30 days, however a 63% reduction of vascular-access complications was seen in the transradial group (18).
Several early studies reported a reduction in mortality rates in patients undergoing transradial access for STEMI (19-21). An example is the Radial Versus Femoral Randomized Investigation in ST Elevation Acute Coronary Syndrome (RIFLE-STEACS) trial. The study not only found a 47% reduction in the rate of access-site related bleeding complications, but also a reduction in the rate of cardiac death and hospital stay with transradial procedure (22). The benefit in reduction of MACE has been proven even in with ACS who undergo transradial access (23)
Further advantages of transradial approach include immediate ambulation, reduced post-procedure nursing care, reduced hospital stay and related costs, and  an overwhelming patient preference for transradial angiography (24-28) . Opponents of radial access have cited an associated learning curve (29) with adopting the transradial approach resulting in longer procedural time and increased radiation exposure (30, 31). Higher-volume radial operators however exhibit shorter procedural and fluoroscopy times as their procedural experience increases (32). Multivariate analysis found the highest radial volume centres and operators had the lowest radiation exposure (33).
An Analysis of Safety Outcomes for Radial Versus Femoral Access for Percutaneous Coronary Intervention from a large clinical registry was performed. This study involves the use of a multi-site registry of 58,862 percutaneous coronary intervention (PCI) procedures in a national healthcare system, the largest clinical registry of treatment practices comparing radial and femoral access outcome. The primary end points were major bleeding and radiation exposure (34). The results showed that femoral access accounted for 94.7% and radial access 5.3% of the procedures. There were fewer bleeding events in the radial group (0.9%) than those in the femoral group (2.2%).Among patients receiving anticoagulants, the femoral bleeding rate was 4.3% compared with radial bleeding rate of 0.7%. For patients receiving bivalirudin, bleeding occurred in 337 patients (1.6%). Radiation exposure in radial cases was significant in cases involving prior coronary artery bypass graft history and non-ST-elevation myocardial infarction. The fluoroscopy time overall was longer among radial cases (19.9min) compared to femoral access (15.7 min) (34). 
The limitation of this study is the difference in patients’ characteristics between the two groups, where sicker patients are more likely to receive femoral access and more stable patients receive transradial approach. Additionally, the registry did not include how many failed radial routes were converted to femoral procedures and did not account for bias related to operator experience and learning curves (34).
The Safety and Efficacy of Femoral Access versus Radial Access in STEMI (The SAFARI-STEMI Trial) is a recent multicentre randomized controlled trial performed in the United States. STEMI patients referred for primary PCI with symptom onset < 12 hours were recruited and randomized to either transradial or transfemoral approach.
Major exclusion criteria were fibrinolytic therapy, oral anticoagulants and prior Coronary Artery Bypass Grafts (CABGs). The primary outcome investigated was all-cause mortality measured at 30 days. The trial also evaluated bleeding events and the composite of major adverse cardiac event (MACE) (35).
Transradial approach was performed in 1136 patients versus 1156 patients receiving transfemoral approach, with similar baseline characteristics and antithrombotic treatment in both groups. The study revealed no significant difference between the 30-day mortality rate in the transradial and transfemoral group (1.5% vs 1.3%). The rate of secondary outcomes was similar for both groups and no major difference in bleeding rates (35).
The trial was stopped early by the Data Safety and Monitoring Board because it was highly unlikely that the trial would show a clinically important difference in 30-day all- cause mortality. The findings suggest that adequately trained operators should be able to achieve similar results using either radial or femoral access for primary PCI. The limitation of this study is that it is an  underpowered trial and it is not clear whether similar good outcomes with femoral access seen in the trail can be achieved in clinical practice (35).
A systematic review of Transradial versus Transfemoral Approach for Diagnostic Angiography and Percutaneous Coronary Intervention in people with Coronary Artery Disease was performed examining the benefit versus harms of the transradial compared to the transfemoral approach in people with CAD undergoing PCI.
This review searched multiple databases including the Cochrane Central Register of Controlled Trials (CENTRAL) (36). After the application of exhaustive inclusion and exclusion criteria, 31 studies were identified which includes 27071 participants.
Transradial access was associated with a reduction in net adverse clinical events, including death from cardiac
cardiac causes, myocardial infarction, stroke, the need to reintervene on the same site of coronary artery stenosis, and bleeding during the first 30 days following intervention. While transradial access reduced death from cardiac causes, death from all causes during the first 30 days following intervention, bleeding, and local complications at the access site.
Further radial cases shortened the length of stay in hospital but was associated with a higher radiation exposure and more technical failures requiring an alternate vascular access route. Procedural success was less with the transradial approach, due to a higher rate of cross-over to a different arterial access. (36)
An important subgroup of patients are those with a previous history of CABGs. A retrospective cohort study by Amro et al revealed that in 216 out of 2153 patients who underwent transradial approach in patients with previous CABGs is had fewer complications and lower contrast use (37), with similar findings in a study done by Hirzallah (38). A safety and efficacy study of this group of patients undergoing TRA showed lower rate of bleeding and MACE compared to TFA (39). Of interest, a meta-analysis of transradial versus transfemoral PCI of left main disease also shown reduced lower bleeding risk while maintaining similar procedural success rate (40).Two studies compared the transradial and transfemoral approaches in people with cardiogenic shock. Both reported a reduction in mortality and MACE with the transradial approach.One study showed a reduction in access site-related and major bleeding (7753 participant)(41), while the other study (8131 participants) reported a reduction in short-term MACE (42).Gender disparity between the two approaches was examined in another study, showing transradial approch was safer and more efficacious in both genders with females having a higher cross-over rate to the femoral approach (43). Sirker et al addressed stroke as an outcome of interest in their meta-analysis and showed no differences between the two approaches (44).
Cost -effectiveness of radial vs femoral approach in primary percutaneous intervention in STEMI was assessed. A sub-analysis of the OCEAN RACE trial recruited 103 patients with myocardial infarction, and they were randomized to either radial or the femoral group. The procedures and length of hospital stay were meticulously logged, and costs were evaluated using the micro-cost method. The indirect costs, such as the patients’ absence from work, were measured using the human capital approach (45).
This study revealed that clinical success was numerically higher in the radial group (90.4 vs 80.4%) and there were no differences in MACE. The cost of therapeutic success was lower in theradial group at 3060 EUR versus 3374 EUR (p<0.01). The indirect costs were lower in the radial group compared to the femoral group. Although total in-hospital cost was similar between the study groups, the indirect cost is much lower in the radial group (45). Of interest, the increasing usage of transradial approach has spread to other disciplines. Transradial approach performed by radiologist for abdominal and peripheral intervention has shown less rate of complication but with longer procedural time compared to transfemoral approach (46). Comparison of transradial and transfemoral approach with thombectomy of anterior circulation stroke revealed equivalence in efficacy and efficiency (47).

The transradial approach for PCI reduces access site complications, time to ambulation and reduces cardiac related death and morbidity in acute coronary syndrome populations. Whether this approach is applicable across all interventions including elective cases remains uncertain. The major impediment of such approach is the lack of training and hesitancy of older interventionalists to switch approaches. While the transfemoral approach has a higher access site complication rate, it is still integral as an access option. The possibility that radial approach (compared to femoral) may have a higher long-term rate of periprocedural stroke requires vigilant surveillance.

Conflict of Interest: None.

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