Hakan Erdem

Prof. Dr. Hakan Erdem

orcid

Research Focus & Metrics

Academic Career Length

29Years (1998-Present)

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

Representative Publications

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1 January 2021 in International Journal of Infectious Diseases
Verified
Journal Article
Open access
HEHakan Erdem
Hakan Erdem
DLDaniel R. Lucey
Daniel R. Lucey
• Healthcare workers (HCW) are part of the frontline in the struggle against the pandemic. • Many HCWs have been infected with SARS-CoV-2 and have ldied worldwide during the pandemic. • We performed an international survey and requested the total numbers of HCW deaths and infections. • Data were obtained from 37 countries, where HCWs have lost their lives in substantial numbers. • We call on the WHO Director-General to highlight this tragedy at the WHO COVID-19 website regularly.

1 February 2014 in Clinical Microbiology and Infection
Verified
Journal Article
Open access
PDF file
AUA. Ulu-Kilic
A. Ulu-Kilic
AKA. Karakas
A. Karakas
HEHakan Erdem
Hakan Erdem
TTT. Turker
T. Turker
AIA.S. Inal
A.S. Inal
SAS. Alabay
S. Alabay
We evaluated the efficacy and tolerability of antibiotic regimens and optimal duration of therapy in complicated and uncomplicated forms of spinal brucellosis. This is a multicentre, retrospective and comparative study involving a total of 293 patients with spinal brucellosis from 19 health institutions. Comparison of complicated and uncomplicated spinal brucellosis was statistically analysed. Complicated spinal brucellosis was diagnosed in 78 (26.6%) of our patients. Clinical presentation was found to be significantly more acute, with fever and weight loss, in patients in the complicated group. They had significantly higher leukocyte and platelet counts, erythrocyte sedimentation rates and C-reactive protein levels, and lower haemoglobulin levels. The involvement of the thoracic spine was significantly more frequent in complicated cases. Spondylodiscitis was complicated, with paravertebral abscess in 38 (13.0%), prevertebral abscess in 13 (4.4%), epidural abscess in 30 (10.2%), psoas abscess in 10 (3.4%) and radiculitis in 8 (2.7%) patients. The five major combination regimens were: doxycycline 200 mg/day, rifampicin 600 mg/day and streptomycin 1 g/day; doxycycline 200 mg/day, rifampicin 600 mg/day and gentamicin 5 mg/kg; doxycycline 200 mg/day and rifampicin 600 mg/day; doxycycline 200 mg/day and streptomycin 1 g/day; and doxycycline 200 mg/day, rifampicin 600 mg/day and ciprofloxacin 1 g/day. There were no significant therapeutic differences between these antibiotic groups; the results were similar regarding the complicated and uncomplicated groups. Patients were mostly treated with doxycycline and rifampicin with or without an aminoglycoside. In the former subgroup, complicated cases received antibiotics for a longer duration than uncomplicated cases. Early recognition of complicated cases is critical in preventing devastating complications. Antimicrobial treatment should be prolonged in complicated spinal brucellosis in particular.

10 April 2017 in European Journal of Clinical Microbiology & Infectious Diseases
Verified
Journal Article
Closed access
PDF file
HEHakan Erdem
Hakan Erdem
AIA. Inan
A. Inan
EGE. Guven
E. Guven
SHSally Hargreaves
Sally Hargreaves
LLLykke Larsen
Lykke Larsen
MNM. Nassar
M. Nassar

1 March 2012 in Antimicrobial Agents and Chemotherapy
Verified
Journal Article
Open access
PDF file
HEHakan Erdem
Hakan Erdem
AUAyşegül Ulu-Kilic
Ayşegül Ulu-Kilic
SKSelim Kilic
Selim Kilic
MKMustafa Karahocagil
Mustafa Karahocagil
Ghaydaa ShehataGhaydaa Shehata
Ghaydaa Shehata
HLHakan Leblebicioglu
Hakan Leblebicioglu
No data on whether brucellar meningitis or meningoencephalitis can be treated with oral antibiotics or whether an intravenous extended-spectrum cephalosporin, namely, ceftriaxone, which does not accumulate in phagocytes, should be added to the regimen exist in the literature. The aim of a study conducted in Istanbul, Turkey, was to compare the efficacy and tolerability of ceftriaxone-based antibiotic treatment regimens with those of an oral treatment protocol in patients with these conditions. This retrospective study enrolled 215 adult patients in 28 health care institutions from four different countries. The first protocol (P1) comprised ceftriaxone, rifampin, and doxycycline. The second protocol (P2) consisted of trimethoprim-sulfamethoxazole, rifampin, and doxycycline. In the third protocol (P3), the patients started with P1 and transferred to P2 when ceftriaxone was stopped. The treatment period was shorter with the regimens which included ceftriaxone (4.40 ± 2.47 months in P1, 6.52 ± 4.15 months in P2, and 5.18 ± 2.27 months in P3) ( P = 0.002). In seven patients, therapy was modified due to antibiotic side effects. When these cases were excluded, therapeutic failure did not differ significantly between ceftriaxone-based regimens ( n = 5/166, 3.0%) and the oral therapy ( n = 4/42, 9.5%) ( P = 0.084). The efficacy of the ceftriaxone-based regimens was found to be better ( n = 6/166 [3.6%] versus n = 6/42 [14.3%]; P = 0.017) when a composite negative outcome (CNO; relapse plus therapeutic failure) was considered. Accordingly, CNO was greatest in P2 (14.3%, n = 6/42) compared to P1 (2.6%, n = 3/117) and P3 (6.1%, n = 3/49) ( P = 0.020). Seemingly, ceftriaxone-based regimens are more successful and require shorter therapy than the oral treatment protocol.

1 November 2015 in Clinical Microbiology and Infection
Verified
Journal Article
Closed access
ABA. Batirel
A. Batirel
HEHakan Erdem
Hakan Erdem
GSG. Sengoz
G. Sengoz
FPF. Pehlivanoglu
F. Pehlivanoglu
ERE. Ramosaco
E. Ramosaco
HVH. Vahaboglu
H. Vahaboglu

1 June 2015 in Antimicrobial Agents and Chemotherapy
Verified
Journal Article
Open access
PDF file
HEHakan Erdem
Hakan Erdem
YCYasemin Cag
Yasemin Cag
DODerya Ozturk-Engin
Derya Ozturk-Engin
SDSylviane Defres
Sylviane Defres
SKSelcuk Kaya
Selcuk Kaya
HVHaluk Vahaboglu
Haluk Vahaboglu
Data in the literature regarding the factors that predict unfavorable outcomes in adult herpetic meningoencephalitis (HME) cases are scarce. We conducted a multicenter study in order to provide insights into the predictors of HME outcomes, with special emphasis on the use and timing of antiviral treatment. Samples from 501 patients with molecular confirmation from cerebrospinal fluid were included from 35 referral centers in 10 countries. Four hundred thirty-eight patients were found to be eligible for the analysis. Overall, 232 (52.9%) patients experienced unfavorable outcomes, 44 died, and 188 survived, with sequelae. Age (odds ratio [OR], 1.04; 95% confidence interval [CI], 1.02 to 1.05), Glasgow Coma Scale score (OR, 0.84; 95% CI, 0.77 to 0.93), and symptomatic periods of 2 to 7 days (OR, 1.80; 95% CI, 1.16 to 2.79) and >7 days (OR, 3.75; 95% CI, 1.72 to 8.15) until the commencement of treatment predicted unfavorable outcomes. The outcome in HME patients is related to a combination of therapeutic and host factors. This study suggests that rapid diagnosis and early administration of antiviral treatment in HME patients are keys to a favorable outcome.