Tahir I. Mohamed

Dr. Tahir I. Mohamed


Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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20 May 2020 in Angiology
Verified
Journal Article
Open access
PDF file
TMTahir I. Mohamed
Tahir I. Mohamed
Omar BaqalOmar Baqal
Omar Baqal
ABAbdulaziz A. Binzaid
Abdulaziz A. Binzaid
KBKarim Belhaj
Karim Belhaj
JAJanti T. Haj Ahmad
Janti T. Haj Ahmad
ZDZiad Dahdouh
Ziad Dahdouh
We report the prevalence of coronary artery disease (CAD) in asymptomatic patients with end-stage kidney disease (ESKD) on hemodialysis and explore the best revascularization strategies prior to kidney transplantation. This is a retrospective single-center study, which included all patients who were candidates for kidney transplantation and underwent coronary angiography between 2003 and 2018. All included patients underwent coronary angiography without noninvasive testing and were asymptomatic cardiac-wise. Out of the 368 patients with ESRD, 45% had coronary vessel disease, 17% had 3-vessel disease, 11% had 2-vessel disease, 5.2% had significant left main artery narrowing, and 17% had single-vessel disease. Patients with 3-vessel disease had the worst survival rate at 5 and 10 years. The patients with significant 3-vessel disease or left main artery involvement underwent revascularization; 19% underwent coronary artery bypass grafting, 5% had stenting of the coronary arteries, and 4.7% were on maximal medical therapy. The patients who underwent stenting had a better survival than those on medical therapy, but the difference was not significant (P = .445). Our findings reflect a high prevalence of CAD in patients with ESKD. There is a need for further studies to evaluate benefits of cardiovascular screening in this patient population.

2 May 2025 in Atherosclerosis
Verified
Journal Article
Open access
NKNaji Kholaif
Naji Kholaif
LBLin Batha
Lin Batha
SASumayah Aljenedil
Sumayah Aljenedil
ZAZuhair Ahmed Awan
Zuhair Ahmed Awan
NANadiah AlRuwaili
Nadiah AlRuwaili
DGDomenico Galzerano
Domenico Galzerano
Homozygous Familial Hypercholesterolemia (HoFH) is a rare, life-threatening genetic disorder causing extremely high low density lipoprotein cholesterol (LDL-C) levels, leading to early cardiovascular disease (CVD) and premature death. In Saudi Arabia, where consanguinity is common, HoFH prevalence is higher with unique genetic pathogenic familial hypercholesterolemia (FH) causing variants and treatment challenges. This study aims to analyze the clinical, genetic, treatment, and cardiovascular outcomes data of Saudi pediatric and adult HoFH patients treated at King Faisal Specialist Hospital & Research Centre (KFSHRC) over 23 years. A retrospective review of all patients (LDL-C >8 mmol/L) at KFSHRC (2000-2023) using European Atherosclerosis Society 2023 criteria to confirm HoFH. Data from those confirmed included demographics, lipid profiles, pathogenic FH-causing variants, treatments, mortality, and cardiovascular outcomes. Among 514 severe hypercholesterolemia cases, 127 had HoFH. Diagnosis occurred at an average age of 14.3 ± 9.7 years. The mortality was 16 %, and 12 % were lost to follow-up. Cardiovascular interventions were performed in 31 % (coronary interventions in 28 % and aortic valve replacement in 17 %). The most common pathogenic FH-causing variants (57 %) was the founder null mutation c.2027del p.(Gly676Alafs∗33). Statins and ezetimibe were the primary treatments (73 %), but many required LDL-apheresis (36 %) or liver transplantation (LTx) (21 %). The peri-operative mortality for LTx was 7 %, but there was no long-term mortality on average follow-up of 6.2 ± 3.6 years, with only one patient requiring percutaneous coronary intervention. Adults were more likely to receive statins/ezetimibe (94 %/91 % vs. 50 %/53 % in pediatrics, p < 0.01) and LDL-apheresis (64 % vs. 8 %, p < 0.001), while liver transplantation was more common in children (38 % vs. 7 %, p < 0.001). This study highlights the burden of null LDL-R pathogenic FH-causing variants and the frequent need for invasive treatments in Saudi HoFH patients. Liver transplantation is a viable option with low peri-operative mortality and favorable long-term disease-free survival. Early diagnosis, regional genetic screening, and access to advanced therapies are essential in achieving better outcomes.

2 February 2023 in Monaldi Archives for Chest Disease
Verified
Journal Article
Open access
PDF file
NKNaji Kholaif
Naji Kholaif
TMTahir I. Mohamed
Tahir I. Mohamed
IAIbrahim S. Alharbi
Ibrahim S. Alharbi
SASumayah A. Aljenedil
Sumayah A. Aljenedil
HAHind AlHumaidan
Hind AlHumaidan
Omar BaqalOmar Baqal
Omar Baqal
We report the incidence, patient characteristic with clinical outcomes in patients with homozygous familial hypercholesterolemia (HoFH) in Saudi Arabia. This is a retrospective and prospective, single center study which included 37 patients 14 years and older enrolled and followed up between 2018-2021 for three years. 46% were females, 78% were offspring of consanguineous marriage. LDLR mutation was in 78% and LDL-C/LDLRAP in 3% of patients. Mean LDL-C at the first presentation was 14.2±3.7 mmol/L, average Dutch lipid score was 20.9±6.24. LDL apheresis was performed on 70% of patients. Most patients were on ezetimibe (92%), high-dose statins ( 84%) and PCSK9 inhibitors (32%). 48.6% had aortic stenosis, out of which 30% had severe aortic stenosis. Ten underwent aortic valve surgery (5 mechanical valve, 3 Ross procedure, 1 aortic valve repair, 1 bioprosthetic valve) and one had transcatheter aortic valve implantation (TAVI). Coronary artery bypass surgery (CABG) was performed on 32% and percutaneous intervention (PCI) on 11% of patients. HoFH patients have complex diseases with high morbidity and mortality, and benefit from a highly specialized multidisciplinary clinic to address their clinical needs. Although there are several therapeutic agents on the horizon, early diagnosis, and treatment of HoFH remain critical to optimize patient outcomes.

12 January 2022 in Journal of the Saudi Heart Association
Verified
Journal Article
Open access
PDF file
TMTahir I. Mohamed
Tahir I. Mohamed
OBOmar J Baqal
Omar J Baqal
ABAbdulaziz A Binzaid
Abdulaziz A Binzaid
HAHussam T AlHennawi
Hussam T AlHennawi
ABAbdulrahman R Barakeh
Abdulrahman R Barakeh
AAAly M Alsanei
Aly M Alsanei
Objective To describe patient characteristics and post-operative outcomes, including early and late mortality, defined by death within 30 days and after 30 days post-surgery, respectively, as well as 20-year survival after isolated reoperative tricuspid surgery. Methods We retrospectively analyzed 169 patients who underwent isolated reoperative tricuspid valve surgery at our institution (between 1997 and 2000) and describe post-surgical outcomes including intraoperative, early and late mortality. All patients included completed 21 years of follow-up. Results The majority of our patients were females 147 (87%) with the mean age of 45.9 ±12.9 years. The mean body mass index (BMI, kg/m2) was 27.4 ±6.0. Previous cardiac surgeries included tricuspid valve surgeries in 169 (100%) patients, with bioprosthetic valves, mechanical valves, annual rings and tricuspid repair surgeries utilized in 37 (21.9%), 21 (12.4%), 38 (22.4%) and 73 (43.2%) patients, respectively. The indication for previous tricuspid surgery was rheumatic heart disease in 154 (91.5%) patients. The most common cause of reoperative valvular surgery was tricuspid regurgitation (TR) in 139 (82.2%), with 66% of patients having severe TR. Other reasons for reoperative surgery included tricuspid stenosis 22 (13%) and dehiscence 8 (4.7%). For the redo surgery, 125 (74%) patients underwent Tricuspid Valve Replacement (TVR), 90 (53%) of whom received bioprosthetic valves while 35 (21%) received mechanical valves. Forty-four patients (26%) underwent Tricuspid Valve Repair. Mortality within 30 days of surgery was 11.3% (20 patients) and 11.4% after 30 days, with 20 years survival being about 80%. Conclusions Based on our experience, reoperation for failed isolated tricuspid valve replacement or repair was associated with reasonable mortality and good survival rate over long period of time.

26 March 2025 in Journal of the Society for Cardiovascular Angiography & Interventions
Verified
Journal Article
Open access
BEBasel Elsayed
Basel Elsayed
ASAhmed Subahi
Ahmed Subahi
HSHamid Sattar
Hamid Sattar
AAAmged Abdelaziz
Amged Abdelaziz
TMTahir I. Mohamed
Tahir I. Mohamed
OAOmar E. Ali
Omar E. Ali
Peripheral artery disease is a global health concern, with femoropopliteal disease being a common manifestation. Recent advancements in endovascular interventions (EVI), guided by intravascular ultrasound (IVUS), have introduced promising treatment options. This study aims to compare in-hospital outcomes and trends of surgical versus IVUS-guided EVI for femoropopliteal disease. The National Inpatient Sample database (2016-2021) was analyzed. Procedures were identified using the International Classification of Diseases, Tenth Revision, Clinical Modification codes, and the Cochran-Armitage test was used to assess temporal trends. Propensity score matching balanced baseline characteristics between the surgical (weighted N = 6700) and IVUS-guided EVI (weighted N = 6700) groups. Multivariable regression analysis adjusting for matched covariates was conducted to compare outcomes. Multivariable logistic regression revealed that in-hospital mortality was lower in the IVUS-guided EVI group (1.6%) compared to the surgical group (3.5%) (OR, 0.386; 95% CI, 0.216-0.692). IVUS-guided EVI also had significantly fewer periprocedural complications (20.6% vs 24.7%; OR, 0.767; 95% CI, 0.636-0.924), including lower rates of bleeding, shock, infections, wound disruption, and respiratory failure. Multivariable linear regression showed that the length of stay was shorter for the IVUS-guided EVI group (β = –1.7 days; 95% CI, –2.2 to –1.1). No statistically significant differences were observed in inflation-adjusted costs, cardiac complications, major amputation, stroke, or renal failure. Intravascular ultrasound–guided EVI for femoropopliteal disease are associated with better in-hospital outcomes compared to surgical revascularization, including lower in-hospital mortality, periprocedural complications, and a shorter length of stay. However, future prospective studies are needed to validate these results.

1 April 2021 in Journal of Invasive Cardiology
Verified
Journal Article
Closed access
ZDZiad Said Dahdouh
Ziad Said Dahdouh
ESElias Salem
Elias Salem
TMTahir I. Mohamed
Tahir I. Mohamed
A previously healthy 30-year-old woman presented with extensive anterior myocardial infarction at day 6 post partum. Her clinical course was complicated by subintimal hematoma. Clinical Images from Journal of Invasive Cardiology. Coronary Artery Dissection subintimal hematoma