|Year : 2020 | Volume
| Issue : 2 | Page : 125-128
The prevalence of and risk factors for peripheral arterial occlusive disease in human immunodeficiency virus-infected omani patients: The first study in GCC
Ahmed Al-Aufi1, Khalifa Al-Wahaibi2, Edwin Stephen2, Abdullah Balkhair3, Ibrahim Abdelhedy2, Hanan Al-Maawali2
1 Division of Surgery, Vascular Surgery Unit, Sultan Qaboos University Hospital, Muscat, Oman
2 Vascular Surgery Unit, Division of Surgery, Sultan Qaboos University Hospital, Muscat, Oman
3 Infectious Diseases Unit, Sultan Qaboos University Hospital, Muscat, Oman
|Date of Submission||05-Nov-2019|
|Date of Acceptance||04-Feb-2020|
|Date of Web Publication||17-Jun-2020|
Dr. Ahmed Al-Aufi
Division of Surgery, Vascular Surgery Unit, Sultan Qaboos University Hospital, Muscat
Source of Support: None, Conflict of Interest: None
Aim: To assess the prevalence of peripheral arterial occlusive disease (PAOD) in human immunodeficiency virus (HIV)-infected Omani patients and to assess the potential risk factors in this group. Methodology: This was a single-center, cross-sectional study. All patients attending the infectious disease clinic between July 2017 and March 2018 were included in the study; their peripheral pulses were examined and pre- and postexercise ankle–brachial pressure index (ABPI) was measured. Normal ABPI was considered as being in the range of 1.0 ± 0.1, and a reduction of >15% postexercise ABPI was considered as a cutoff limit to define PAOD. The Edinburgh Claudication Questionnaire was answered by all patients, and CD4 count, viral load, albumin and Vitamin D (25-OH) levels, and glycated hemoglobin (HbA1c) were measured. The data were analyzed using IBM SPSS Statistics version 22. Results: Eighty-eight patients who were retroviral positive were enrolled in the study. Fifty-three (60.2%) patients were male and 35 (39.8%) were female, with a mean age of 43 years (24–71). The dorsalis pedis artery pulsation was absent bilaterally in 3 (3.4%) patients. None of the patients had a history of claudication; 1 (1.1%) had an abnormal ABPI; 17 (19.2%) had a reduction of >15% postexercise ABPI; 7 (8%) had CD4 count <200; 4 (4.5%) had detectable viral load; albumin level was <25 g/L in 5 (5.8%); 15 (17%) had Vitamin D (25-OH) <50 nmol/L; and 4 (4.5%) had an abnormal HbA1c. Conclusions: The prevalence of PAOD in HIV-infected patients is higher compared to the general population as was evident from an abnormal postexercise ABPI. Risk factors that stood out while not having a significant P- value were low values of CD4 counts and Vitamin –D levels.
Keywords: Ankle–brachial pressure index, arterial, asymptomatic arterial disease, CD4, laudication, Gulf Cooperation Council, human immunodeficiency virus, immunodeficiency, Oman, peripheral arterial occlusive disease, prevalence, vascular
|How to cite this article:|
Al-Aufi A, Al-Wahaibi K, Stephen E, Balkhair A, Abdelhedy I, Al-Maawali H. The prevalence of and risk factors for peripheral arterial occlusive disease in human immunodeficiency virus-infected omani patients: The first study in GCC. Indian J Vasc Endovasc Surg 2020;7:125-8
|How to cite this URL:|
Al-Aufi A, Al-Wahaibi K, Stephen E, Balkhair A, Abdelhedy I, Al-Maawali H. The prevalence of and risk factors for peripheral arterial occlusive disease in human immunodeficiency virus-infected omani patients: The first study in GCC. Indian J Vasc Endovasc Surg [serial online] 2020 [cited 2020 Sep 30];7:125-8. Available from: http://www.indjvascsurg.org/text.asp?2020/7/2/125/286916
| Introduction|| |
The American Heart Association and American College of Cardiology guidelines define peripheral arterial occlusive disease (PAOD) as a resting ankle–brachial pressure index (ABPI) of <0.9 or if there was absolute decrease of >0.15 postexercise.,
PAOD is a focal manifestation of atherosclerosis and is a predictor of cardiovascular outcomes. The prevalence of PAOD in a healthy population was extracted from international data and taken as 1%–3%. Majority of the population with PAOD is asymptomatic. Therefore, early diagnosis of PAOD may provide an opportunity for physicians to identify and prevent cardiovascular events in high-risk patients.
The effective usage of antiretroviral therapy in patients with human immunodeficiency virus (HIV) infection has led to improved life expectancy,, and has therefore led to the development of other comorbidities such as cardiovascular disease and PAOD. Previous studies among the Caucasian population have suggested a higher prevalence of PAOD in HIV-infected patients.,,, However, this was not reported to be the case from a study in India. Evidence from Oman is lacking in both English and Arabic literature on this subject.
The mechanism through which this risk is increased is not well understood. Reports suggested that the HIV inflicts direct damage to the endothelium. Other theories include side effects of retroviral therapy.,
To estimate the prevalence of PAOD in people with HIV infection and to determine the associated risk factors.
| Methodology|| |
This was a cross-sectional clinical study. The study was conducted in a tertiary care center in Oman, after approval by the ethics and research committee of the institution from June 2017 to March 2018. The vascular clinical nurse specialist was the sole person present in the clinic of the infectious disease department to guide patients in filling the Edinburgh Claudication Questionnaire and to measure their ABPI and vital signs, after informed consent was taken by the first author. Patients were then asked to perform 20 observed squats and then the ABPI was remeasured.
List of comorbidities, laboratory tests, and medication list were then gathered from the electronic patient record and were documented. A total of 88 patients were included and all patients completed the exercise test successfully. The data were then entered into an SPSS data sheet and were analyzed.
An ABPI of > 0.9 or more than 15% absolute reduction between pre- and postexercise ABPI was considered as a cutoff limit for the definition of PAOD. CD4 counts of <200 were considered as low.
Detectable viral load was presumed as a risk factor; serum albumin level of <25 g/l, Vitamin D (25-OH) levels <50 nmol/l, and glycated hemoglobin (HbA1c) of >5.9 were considered as significant.
All patients attending the infectious disease clinic during the study period were included, except patients who could not perform the exercise test due to any reason. The data were entered into to a spreadsheet and were analyzed using IBM® SPSS Statistics version 22 (New York, USA).
| Results|| |
Ninety-three patients were seen in the infectious diseases clinic during the study period. Of these, 88 patients were included as 5 were unable to perform squats.
Fifty-three (60.2%) patients were male and 35 (39.8%) were female [Figure 1]. The mean age for males was 43.5 years with an age range between 26 and 71 years, whereas the mean age for females was 43.6 years ranging between 24 and 65 years.
The mean duration of HIV infection was 10.1 years, with maximum of 28 and minimum of 1 year. Forty-eight (48%) patients had HIV infection for ≥10 years [Figure 2].
The posterior tibial artery pulse was palpable in all patients, with the dorsalis pedis artery pulsation absent bilaterally in 3 (3.4%) patients. None of the patients had a history of claudication; 1 (1.1%) had an abnormal resting ABPI; 17 (19.2%) had a reduction of >15% postexercise ABPI, which was statistically significant (P< 0.0001); 13 (72.2%) were male and 5 (27.8%) were female; 7 (8%) had CD4 count <200; 4 (4.5%) had detectable viral load; albumin level was <25 g/L in 5 (5.8%); 15 (17%) had Vitamin D (25-OH) <50 nmol/L; and 4 (4.5%) had an abnormal HbA1c.
Diabetes was recorded in 19 (21.6%) patients, which is similar to the national prevalence in the general Omani population. Fifteen (17%) of the patients had hypertension and 9 (10.2%) were current smokers. Hyperlipidemia was detected in 40 (46%) patients. CD4 count of <200 was observed in 7 (8%) patients. No significant correlation was found between peripheral artery disease and any of the studied risk factors including diabetes, hypertension, dyslipidemia, duration of HIV infection, CD4 count, and smoking.
| Discussion|| |
HIV infection was correlated with the occurrence of multiple systemic diseases and also is recognized as a risk factor for health problems., PAOD is no different as previous studies suggest. The theories that were postulated to explain increased prevalence were the direct endothelial damage because of the HIV virus and side effects of medications used to treat the HIV infection resulting in the development of atherosclerosis and as a final consequence of PAOD.,,
We designed this study to look whether this increased prevalence holds true for the Omani population, and if the prevalence is high, look into the possible risk factors.
After collecting history and examining 88 patients with HIV infection, we noted that the prevalence of PAOD is 19.2%. This percentage is of people who had an Ankle-Brachial Pressure Index (ABPI) of <0.9 at rest and/or who dropped their ABI by >15% after exercise.,, Although this percentage might come close to the percentages suggested by other studies, looking into its clinical significance might render it insignificant. This is evidenced by the fact that no significant correlation is found between HIV infection and the suggested risk factors and that 16 out of 17 patients with PAOD continued to have ABPI of 0.9 or higher after exercise stress.
Only one patient had a resting ABI of <0.9 and 17 patients had a drop of >15% of their resting ABPI. Despite the 15% drop in the ABPI, these patients still had normal ABPIs, i.e., >0.9 at the end of the exercise. The drop was statistically significant (P< 0.005) and proves the efficacy of the exercise test, but it is of minimal clinical value. The clinical values of this higher prevalence were doubted when we looked into possible risk factors for the increased percentage. There was no significant correlation between PAOD on the one side and age, diabetes, duration of HIV infection, CD4 count, serum albumin, HbA1c, and Vitamin D level on the other side.
| Conclusions|| |
The population of Oman is around 5 million and the pattern of disease has changed over the last 50 years with noncommunicable disease taking precedence over communicable disease. Infections such as HIV are also on the rise and this brings up an array of HIV-related complications. Data from the Western populations indicated that the risk of development of PAOD in HIV-infected patients is higher as compared to the age-matched normal patients. Data from Oman and the Gulf Community Collaboration are, however, lacking. We designed this study to have an idea whether a similar correlation to that of Caucasian population exists between HIV infection and PAOD in Omani people.
The prevalence of PAOD in HIV-infected people was 19.2% in our study compared to the general population of 3%. Although this higher prevalence is of doubtful clinical significance, given the fact that all of the patients in the study are asymptomatic and also that majority of people comprising this increased prevalence had a statistically significant drop of ABI postexercise, their ABI remained normal.
A larger patient population needs to be studied in order to categorically state that the presence of HIV does not increase the risk of PAOD. With this suggestion implemented, it will be more plausible to look into diseasespecific risk factors and may form the background for further research in the future.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]