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Comparing the Left Distal Transradial Artery Access to Traditional Access Methods For Coronary Angiography: A Single-Center Experience

Article Information

Maleeha Saleem*1, Steven A Hamilton1, Karan Pahuja2, Mohab Hassib2, Ahmed Elkhouly3, Muhammad Haseeb-ul-Rasool4, Justin Fox5

1Co-first authors - Resident physician, Internal medicine, Jersey Shore University Medical Center/Saint Francis Medical Center, Trenton, NJ, USA.

2Co-second authors- Resident physician, Internal medicine, Jersey Shore University Medical Center/Saint Francis Medical Center, Trenton, NJ, USA.

3Resident physician, Internal medicine, Jersey Shore University Medical Center/Saint Francis Medical Center, Trenton, NJ, USA.

4Resident physician, Internal Medicine, Icahn School of Medicine at Mount Sinai Queens Hospital Center, NY, USA

5Interventional Cardiologist, Medical Director, Hamilton Cardiology Associates’IAC Accredited Nuclear Cardiology Lab,Medical Director, Saint Francis Medical Center Chest Pain Center, Trenton, NJ, USA

*Corresponding author: Maleeha Saleem, Jersey Shore University Medical Center/ Saint francis Mediical Center, Trenton, New Jersey, USA

Received: 08 June 2022; Accepted: 16 June 2022; Published: 27 June 2022

Citation:

Maleeha Saleem, Steven A Hamilton, Karan Pahuja, Mohab Hassib, Ahmed Elkhouly, Muhammad Haseeb-ul-Rasool, Justin Fox. Comparing the Left Distal Transradial Artery Access to Traditional Access Methods For Coronary Angiography: A Single-Center Experience. Cardiology and Cardiovascular Medicine 6 (2022): 325-339.

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Abstract

Objective: The aim of this study was to compare the effectiveness and safety of left distal transradial (LdTRA) approach in patients who had prior coronary artery bypass grafting (CABG) with conventional femoral and radial access for coronary angiography. Background: The left distal transradial approach (LdTRA) is newer vascular access for coronary angiography. We hypothesized that LdTRA is superior to traditional femoral (TFA) and traditional right radial approaches for cardiac catheterization in patients who underwent prior bypass graft surgery (CABG).

Methods: We retrospectively evaluated 417 patients with prior CABG, undergoing coronary angiography at our institution between January 2018 and August 2020, to compare the type of intervention using site of access as the independent factor. We screened patients' charts using Xper IM. Analyses were performed by Statistical Product and Services Solution using Chi Square test and Pearson's correlation for categorical data and ANOVA test for nominal data, at a p value of <0.05. Predefined endpoints were time to access, procedure duration, mean length of hospital stay, fluoroscopy time and dose.

Results: The mean time for femoral access was 37.68±1.19 seconds (95% CI 35.3295-40.04), for LdTRA (snuffbox access) was 36.4±5.06 seconds (95% CI=26.03-46.81), and for proximal radial access was 40.71±4.17 seconds (95% CI=31.21-50.20).Mean procedural time via femoral access was 37.68±1.97 minutes, via snuffbox access was 36.43±5.06 minutes, and via radial access was 40.71±4.17 minutes. Mean length of stay for femoral access was 1.97±0.14 days, for radial access 2.13±0.31 days and for snuffbox access 1.68±0.27 days. The fluoroscopy time for femoral access was 10.23±0.41 minutes, for snuffbox access

Keywords

Snuffbox; coronary angiography; coronary artery bypass grafting; left distal radial artery; radial artery occlusion

Snuffbox; coronary angiography; coronary artery bypass grafting; left distal radial artery; radial artery occlusion articles

Article Details

1. Introduction

Percutaneous coronary intervention (PCI) is the recommended revascularization procedure for patients with acute coronary syndrome (ACS) [1]. Despite the advancements associated with the procedure, complications are known to occur and almost half of them are access site complications which can lead to prolonged hospital stay and increased mortality and morbidity [1]. CABG patients represent a subset of challenging coronary artery disease patients with multivessel disease, complex coronary anatomies [2], and high atherosclerotic disease burden in other arterial territories such as iliac and femoral arteries [3]. They tend to be older and have multiple comorbid conditions [4].

Minimizing the procedural risks while adequately cannulating the grafts remains a challenge [2]. For diagnostic angiography in general, transradial access (TRA) has increasingly become a more popular method than TFA and carries several advantages including faster mobilization [5], reduced access site bleeding complications [6], and greater patient comfort [7]. Nonetheless, TRA does come with some degree of risk including radial artery occlusion (RAO), increased radiation exposure [8], and, rarely, osteofascial compartment syndrome of the forearm [6]. Additionally, in patients with prior CABG, radial access is sometimes made more challenging due to the presence of IMA grafts, gastroepiploic artery grafts, and incidences where the radial artery had been harvested as a conduit [9].

After CABG, many patients require subsequent coronary angiograms, and TFA has traditionally been the most commonly used access site in cannulation in these patients [10]. Unfortunately, most studies comparing radial and femoral approaches excluded CABG patients and therefore limited studies are available regarding the ideal access site [2].

First introduced by Kiemeneij [10] in 2017, LdTRA, has increasingly been used for arterial access in PCI. This technique involves accessing the distal radial artery in the anatomical snuffbox of the hand [10]. It is a much more feasible approach in patients with prior CABG involving left inframammary artery (LIMA) grafts [11] and more ergonomic for both the operator and the patient as it requires the hand to remain pronated during the procedure [12] and spares the superficial palmar branch thus reducing the risk of RAO and compartment syndrome of forearm [13]. To the best of our knowledge, this is the first retrospective study addressing the simultaneous comparison of LdTRA, TRA, and TFA in post-CABG patients undergoing coronary angiography..

2. Methods

We retrospectively studied 417 patients with prior CABG who were undergoing coronary angiography at our institution’s cardiac catheterization lab between January 2018 and August 2020, to compare the type of intervention using the site of access as an independent factor. The study took place in consideration of ethical principles for medical research involving human subjects. No recruitment was needed as there was no intervention involved. The procedures were performed by board certified interventional cardiologists who were skilled in radial access. There was no consent taken as this was a retrospective chart review. Data collection was performed through chart review. Patients with no prior history of CABG were excluded from the study. The following information was obtained: Patient demographics (age, gender, BMI, smoking), pre-existing medical conditions (diabetes, hyperlipidemia, COPD, hypertension, CKD), family history of ischemic heart disease (IHD), prior PCI, prior history of heart failure, prior history of myocardial infarction (MI), information on catheterization procedure (eg time to gain access, access site, procedure duration, fluoroscopy dose and fluoroscopy time) and length of hospital stay.

These parameters were examined in three groups of patients who have had coronary angiography +- intervention; the first group who had their angiography access via the TFA to those with TRA versus those who had their access via LdTRA. We screened patients' charts using Xper IM. Analyses were performed by Statistical Product and Services Solution using the Chi-Square test and Pearson's correlation for categorical data and ANOVA test for nominal data. All the analyses were done using an alpha (α) level of <0.05. Pre-defined endpoints were time to access, procedure duration, fluoroscopy time, and dose and length of hospital stay. Mortality was not observed among the three groups.

3. Results

650 patients were screened from the hospital database using Prior CABG as screening criteria. (ICD 10 Codes: Z95.1). After an initial screening to include patients who had their right radial artery used as a graft during CABG, 398 patients were found eligible for study participation as shown in flow diagram.

fortune-biomass-feedstock

Figure 1: Study Flow Diagram showing total and final number of patients in retrospective analysis after application of exclusion criteria

Based upon whether LdTRA, right TRA or femoral artery was used for vascular access, patients were classified into three groups. Out of the total sample size of 398 patients, 324 patients underwent coronary angiography using femoral approach, 28 patients had LdTRA and about 46 patients had right TRA. Out of 398 patients, 78.4% were identified as males and 21.6% were identified as females. The mean age was 71.6 years. 14.3% were smokers, 97.5% had hypertension, 50.5% had diabetes, 98.0% had hyperlipidemia, 35.2% had a family history of Ischemic heart disease, 52.3% had a prior myocardial infarction, and 27.6% had a history of prior heart failure. The distribution of the type of approach used during PCI using demographic characters was as follows:

Table1 A:

 

Femoral Approach

Left distal Radial Approach

Right proximal radial Approach

 

Number

Percentage

Number

Percentage

Number

Percentage

Number of patients

324

81.4

28

7.0

46

11.6

Table 1 B:

Table icon

Table 1: A: Distribution of total sample size with respect to type of access,

B: showing distribution of demographic risk factors in all three subgroups of arterial access

Considering BMI as a risk factor for ease of access, patients were classified based on BMI into further subgroups as

  1. Group 1: BMI = <18.5
  2. Group 2: BMI= 5-24.9
  3. Group 3: BMI= 0-29.9
  4. Group 4: BMI= 0-34.9
  5. Group 5: BMI= 0-39.9
  6. Group6: BMI= >40.0

Table 2: Distributions of BMI in the subgroups based on type of access

 

Femoral approach

Left  distal radial approach

Right proximal radial approach

 

Sample

Percentage

Sample

Percentage

Sample

Percentage

Group 1

3

0.9

0

0.0

2

4.3

Group 2

65

20.1

5

17.9

6

13.0

Group 3

124

38.3

10

35.7

9

19.6

Group 4

93

28.7

8

28.6

17

37.0

Group 5

23

7.1

4

14.3

6

13.0

Group 6

16

4.9

1

3.6

6

13.0

Time of access, time of procedure, fluoroscopy time, fluoroscopy dose, length of post-procedural stay were the parameters used to judge the clinical difference between the approaches used. The results are as follows: The mean time for femoral access was 37.68±1.19 seconds (95% CI 35.3295-40.04), for snuffbox access 36.4±5.06 seconds (95% CI=26.03-46.81), and for proximal radial access 40.71±4.17 seconds (95% CI=31.21-50.20).Mean procedural time via femoral access was 37.68±1.97 minutes, via snuffbox access was 36.43±5.06 minutes, and via radial access was 40.71±4.17 minutes. Mean length of stay for femoral access was 1.97±0.14 days, for radial access 2.13±0.31 days and for snuffbox access 1.68±0.27 days. The fluoroscopy time for femoral access was 10.23±0.41 minutes, for snuffbox access was 11.28±2.00 minutes and for radial access was 13.23±1.74 minutes. The fluoroscopy dose for femoral access was 599.98±26.63 Gy/cm2, for snuffbox approach 722.71±112.94 Gy/cm2 and for radial access was 767.06±90.89 Gy/cm2. There were no complications noted in our study. We found no statistical significance difference between approaches with regards to time of access, procedure duration, fluoroscopy time and dose.

Table 3: showing the relationship between different measured parameters with reference to type of access

 

Femoral Approach

Left Radial Approach

Right proximal radial Approach

 

Mean time

95% CI

Mean time

95% CI

Mean time

95% CI

Time for access

(Seconds)

36.4±5.06

26.03-46.81

40.71±4.17

31.21-50.2

37.68±1.19

35.33-40.04

Procedural time

(Seconds)

36.43±5.06

26.52-46.34

40.71±4.17

32.54-48.88

37.68±1.97

33.82-41.54

Fluoroscopy time

(Seconds)

11.28±2

7.36-15.2

13.23±1.74

9.82-16.64

10.23±0.41

9.63-11.04

Fluoroscopy dose

(Gy/cm2)

722.71±112.94

501.35-944.07

767.06±90.89

588.92-945.21

599.98±26.63

547.79-652.17

Length of stay

(Days)

1.68±0.27

1.15-2.21

2.13±0.31

1.53-2.74

1.97±0.14

1.7-2.24

Table 4: showing the results of Chi- square test to identify statistical significance of difference between the choice of site for access and the demographic risk factors

     

Access Site

   
     

Femoral

Left Radial

Right proximal radial

Chi Square Value

Asymp Sig.

Age

<50 yrs

Observed

2

0

0

18.577

0.046

Expected

1.81.8111.81.

0.1

0.1

50-60 yrs

Observed

24

3

9

Expected

29.1

2.6

4.3

61-70 yrs

Observed

91

7

18

Expected

94.4

8.2

13.4

71-80 yrs

Observed

113

11

16

Expected

114

9.8

16.2

81-90 yrs

Observed

90

6

2

Expected

79.8

6.9

11.3

91-100 yrs

Observed

4

1

1

Expected

4.9

0.4

0.7

Gender

Male

Observed

249

25

38

2.898

0.235

Expected

254

21.9

36.1

Female

Observed

75

3

8

Expected

70

6.1

9.9

Smoker

No

Observed

281

26

34

6.656

0.036

Expected

277.6

24

39.4

Yes

Observed

43

2

12

Expected

46.4

4

6.6

Hypertension

No

Observed

10

0

0

2.343

0.31

Expected

8.1

0.7

1.2

Yes

Observed

314

28

46

Expected

315.9

27.3

44.8

Dyslipidemia

No

Observed

7

0

1

0.618

0.734

Expected

6.5

0.6

0.9

Yes

Observed

317

28

45

Expected

317.5

27.4

45.1

Family History of Cardiac Disease

No

Observed

216

17

25

2.904

0.234

Expected

210

18.2

29.8

Yes

Observed

108

11

21

Expected

114

9.8

16.2

Prior Myocardial Infarction

No

Observed

154

17

19

2.659

0.265

Expected

154.7

13.4

22

Yes

Observed

170

11

27

Expected

169.3

14.6

24

Prior Heart Failure

No

Observed

236

20

32

0.229

0.892

Expected

234.5

20.3

33.3

Yes

Observed

88

8

14

Expected

89.5

7.7

12.7

Prior PCI

No

Observed

147

18

24

4.156

0.125

Expected

153.9

13.3

21.8

Yes

Observed

177

10

22

Expected

170.1

14.7

24.2

Valve Surgery

No

Observed

292

27

43

0.648

0.439

Expected

294.7

25.5

41.8

Yes

Observed

32

1

3

Expected

29.3

2.5

4.2

BMI

<18.5

Observed

3

0

2

18.674

0.97

Expected

4.1

0.4

0.6

18.5-24.9

Observed

65

5

6

Expected

61.9

5.3

8.8

25.0-29.9

Observed

124

10

9

Expected

116.4

10.1

16.5

30.0-34.9

Observed

93

8

17

Expected

961

8.3

13.6

35.0-39.9

Observed

23

4

6

Expected

26.9

2.3

3.8

>40.0

Observed

16

1

6

Expected

18.7

1.6

2.6

CKD With Dialysis

No

Observed

302

27

44

0.784

0.676

Expected

303.6

26.2

43.1

Yes

Observed

22

1

2

Expected

20.4

1.8

2.9

COPD

No

Observed

234

20

31

0.463

0.793

Expected

232

20.1

32.9

Yes

Observed

90

8

15

Expected

92

7.9

13.1

DM

No

Observed

155

16

26

1.919

0.383

Expected

160.4

13.9

22.8

Yes

Observed

169

12

20

Expected

163.6

14.1

23.2

The Chi Square Test shows that there is a significant difference between choice of site of access and Age and smoking status (p <0.05). ANOVA test was run using Site of access, categorical age, categorical BMI and smoking as independent factor and procedural time, time of access, length of Hospital stay, fluoroscopy time and fluoroscopy dose as dependent factors. One way ANOVA revealed that there was a statistical significant difference in fluoroscopy dose between at least two groups based on BMI. (F(5,392)=[12.153], p<0.001). Similarly, there was a statistically significant difference in the time of access in patients grouped based on smoking (F(1,396)=[6.795], p=0.009).

fortune-biomass-feedstock

Figure 1: Bar chart showing the relationship between access time, procedure time and fluoroscopic time in all three approaches

Student-Newman-Keuls Post-Hoc Analysis was conducted to see the statistically significant difference between subgroups. Post Hoc Analysis could not be carried out for the relationship of smoking and time of access. However, Post Hoc Analysis showed that the mean dose of fluoroscopy significantly varies between patients with BMI <30 and those with >30. All the analysis were done using alpha (α) level of <0.05. Based on the findings as stated above, our study did not find any statistical significant difference the choice of site of access, the demographic factors, time of access, procedural time, fluoroscopy time, fluoroscopy dose and length of Hospital stay, except for a significant increased fluoroscopy dose in patients with BMI >30. Therefore, the null hypothesis holds stating that there is no difference in outcome of patient regardless of site of access use.

4. Discussion

Radial access remains the most preferred way of coronary angiography by operators today [14]. Multiple studies, including randomized trials that compared TRA with TFA have shown that TRA is associated with greater patient satisfaction, reduced bleeding and vascular complications [15], reduced morbidity and mortality [16-19], and cost reductions [20].

However, although infrequent, TRA is associated with some known complications such as asymptomatic and symptomatic RAO, perforation, spasm, nonocclusive injury, pseudoaneurysm and arteriovenous fistulae [21-22]. These complications may prevent future utilization of the radial artery, including use as the grafting vessel in coronary artery bypass graft (CABG), repeat access for staged or repeat PCI and establishing arteriovenous fistulae in chronic renal dysfunction [23]. The right TRA is more commonly used as compared to the left TRA, because performing catheterization through the left TRA approach is ergonomically challenging for operators, especially in cases of obese patients and short operators [6]. In patients whom the left radial is chosen (e.g. right radial tortuosity, spasm or occlusion and in the left internal mammary angiography graft), these technicalities may be overcome by using the left distal transradial approach (LdTRA), otherwise called the anatomical snuffbox approach [23, 24]. First introduced in 2017 by Kiemencij [10], this approach was found to be more convenient for both parties involved because patients can keep their left hand pronated near their right groin, which allows the operator to cannulate the artery at the snuffbox without reaching across the patient [12]. The risk of complications was also lower with LdTRA as it spares the palmar branch that supplies the deep palmar arch, reducing ischemic hand events and also facilitates early hemostasis [6].

The patients with prior history of CABG undergoing PCI are traditionally approached using the femoral artery and are often excluded from the studies comparing the TFA and TRA [2]. In this subgroup of prior CABG, several factors have to be taken into account such as graft anatomy, graft degeneration, long standing atherosclerosis and diffusely diseased aortic wall [2]. The novel LdTRA has proven to have a better safety profile and higher satisfaction in recent years [4]. This is mainly due to shortened compression time, better hemostasis and lower incidence of RAO and spasm [4,13]. It was previously thought that LdTRA was associated with increased rate of cannulation failure and increased time of access when compared to TRA [25]. However, recent studies and meta-analysis have shown no difference in access success rate and puncture time between TRA and LdTRA approaches when performed by experienced operators [6].

Our study population was heterogeneous with mostly elderly patients with a mean age of 71.6 years. We also had a large number of patients with hypertension (97.5%), almost fifty percent had diabetes and 25% receiving hemodialysis. In end stage renal disease patients on hemodialysis, operators may prefer to use distal transradial access, as it will preserve the proximal artery for a future arteriovenous fistula [26]. Almost 35 % of patients were overweight (BMI 25-29) and almost thirty percent of patients were obese (BMI >/= 30). Central obesity may preclude the patient from being able to place their left arm across their lower abdomen in position for the operator to cannulate the artery [27]. Advancing the wire at the point of the elbow can be troublesome especially when patients are obese and must bend their elbow to place their hand at their right groin [27]. Additionally, using post hoc analysis, the mean dose of fluoroscopy significantly varies between patients with BMI <30 and those with >30 and it showed significantly increased fluoroscopy doses in patients with BMI >30.

The main results of our study did not show any statistically significant difference between the three approaches for invasive coronary procedures in terms of set endpoints. Ghose T et al reported that with LdTRA, there was a statistically significant increased mean procedure time, mean fluoroscopic time and similar fluoroscopic dose compared with TRA [28]. With regards to radiation exposure, the LdTRA approach places the operator farther away from the radiation source as the patient's hand is placed at the right groin, which may reduce radiation exposure to the operator [29]. Our study did not show any statistically significant difference between all three accesses for the aforementioned outcomes. A possible explanation for this difference could be due to the experience of the operators or the fact that our study had fewer participants. Similar to our retrospective study, Stefano et al reported in their meta-analysis that, in patients with previous CABG undergoing coronary procedures, TRA is associated with similar procedural and fluoroscopy times compared with TFA [11]. Several observational studies comparing TRA with TFA showed there are reduced complications with the transradial approach [30]. Data from the triangle registry [31] showed that there was a longer puncture time and a longer fluoroscopic time in LdTRA compared with rdRA (right distal radial access). The registry used no randomization or control group [31].

Coughlan ct. al [27] found that LdTRA could shorten length of stay for patients from a post-procedural standpoint. This was secondary to shortened post procedural radial compression time as compared with TRA. Our study in comparison with LdTRA, TRA and TFA did not show any difference between length of hospital stay. At this time there are no studies in the literature comparing LdTRA with conventional access methods in patients with prior CABG. Considering that most patients with CABG have in-situ left internal mammary artery (IMA) grafts and a variable number of aortocoronary saphenous vein grafts, LdTRA would probably be most appropriate given the ergonomic benefit to the operator, particularly in what can be a longer procedure in which several grafts need to be cannulated.

5. Study Limitation:

Our study is limited by a relatively small study sample, single-center experience with two operators performing the vast majority of the distal radial cases, and the retrospective nature of the analysis.  To best answer the question of which access site is best for patients with prior CABG undergoing coronary angiography, a randomized trial would be needed.

6. Conclusion:

Due to the lack of statistical significance between outcomes of either approach, all approaches remain reasonable access options in post-CABG patients. Clinically, the left distal radial approach may be superior and is recommended by the authors of this study because it avoids the risks of femoral access complications in these complex patients, allows an easy approach to the LIMA graft, and is more ergonomic for the operator than left proximal radial access.

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