Browse publications by year: 2018

  1. Phang ZH, Saw XY, Nor NFBM, Ahmad ZB, Ibrahim SB
    BMC Cancer, 2018 Nov 14;18(1):1112.
    PMID: 30428857 DOI: 10.1186/s12885-018-5012-3
    BACKGROUND: Sacral chordoma is a locally aggressive malignant tumour originating from ectopic notochordal cells. The natural history of sacral chordoma is a slow growing tumour arising at the midline of the lower sacrum that can invade the sacrum and progressively increase in size expanding cranially and anteriorly. Metastasis is very rare even when the tumour is large. Sacral chordoma affects males more than females and is more commonly found in middle age and elderly patients.

    CASE PRESENTATION: A 25 years old female had neglected an extremely large midline sacral mass for 2 years. On presentation to hospital, she had been bed bound for the past 2 years. The sacral mass was so large that it prevented her from lying down supine and sitting on the wheelchair comfortably. Clinical examination showed a 40 cm × 30 cm × 20 cm hard mass over the sacrum that involved both buttocks and the gluteal fold. Neurological exam of bilateral lower limb was normal. Computed Tomography Scan of the Pelvis showed a large destructive sacrococcygeal mass measuring 43 cm × 38 cm × 27 cm with extension into the presacral space resulting in anterior displacement of the rectum, urinary bladder and uterus; and posterior extension into the dorsal soft tissue with involvement of the gluteus, piriformis, and left erector spinae muscles. Biopsy taken confirmed Chordoma. This patient was managed by a multidisciplinary team in an Oncology referral centre. The patient had undergone Wide En Bloc Resection and Sacrectomy, a complex surgery that was associated with complications namely bleeding, surgical site infection and neurogenic bowel and bladder. Six months post operatively the patient was able to lie supine and sit on wheelchair comfortably. She required extensive rehabilitation to help her ambulate in future.

    CONCLUSION: This is a rare case of neglected sacral chordoma in a young female treated with Wide En Bloc Resection and Sacrectomy associated with complications of this complex surgery. Nevertheless, surgery is still worthwhile to improve the quality of life and to prevent complications secondary to prolonged immobilization. A multidisciplinary approach is ideal and team members need to be prepared to address the complications once they arise.

    MeSH terms: Adult; Biopsy; Chordoma/pathology; Chordoma/surgery*; Female; Humans; Postoperative Complications/etiology; Postoperative Complications/rehabilitation*; Sacrum/pathology; Sacrum/surgery; Spinal Neoplasms/pathology; Spinal Neoplasms/surgery*; Tomography, X-Ray Computed; Treatment Outcome; Neurosurgical Procedures/adverse effects; Neurosurgical Procedures/methods*; Tumor Burden; Neglected Diseases/pathology; Neglected Diseases/surgery*
  2. Sittichaya W, Beaver RA
    Zookeys, 2018.
    PMID: 30429655 DOI: 10.3897/zookeys.795.28384
    A new species, Cnestusquadrispinosus, is described from Thailand, Brunei Darussalam, and East Malaysia (Sabah). It is compared to three related species of Cnestus which lack a mycangial tuft of hairs on the pronotum, and have an impressed elytral declivity.
    MeSH terms: Animals; Brunei; Hair; Malaysia; Thailand; Weevils
  3. Song CP, Liew PE, Teh Z, Lim SP, Show PL, Ooi CW
    Front Chem, 2018;6:529.
    PMID: 30430106 DOI: 10.3389/fchem.2018.00529
    The formation of aqueous two-phase system (ATPS) with the environmentally friendly and recyclable ionic liquid has been gaining popularity in the field of protein separation. In this study, the ATPSs comprising N,N-dimethylammonium N',N'-dimethylcarbamate (DIMCARB) and thermo-responsive poly(propylene) glycol (PPG) were applied for the recovery of recombinant green fluorescent protein (GFP) derived from Escherichia coli. The partition behavior of GFP in the PPG + DIMCARB + water system was investigated systematically by varying the molecular weight of PPG and the total composition of ATPS. Overall, GFP was found to be preferentially partitioned to the hydrophilic DIMCARB-rich phase. An ATPS composed of 42% (w/w) PPG 1000 and 4.4% (w/w) DIMCARB gave the optimum performance in terms of GFP selectivity (1,237) and yield (98.8%). The optimal system was also successfully scaled up by 50 times without compromising the purification performance. The bottom phase containing GFP was subjected to rotary evaporation of DIMCARB. The stability of GFP was not affected by the distillation of DIMCARB, and the DIMCARB was successfully recycled in three successive rounds of GFP purification. The potential of PPG + DIMCARB + water system as a sustainable protein purification tool is promising.
    MeSH terms: Escherichia coli; Ions; Molecular Weight; Water; Propylene Glycol; Green Fluorescent Proteins; Ionic Liquids; Distillation; Hydrophobic and Hydrophilic Interactions; Recycling
  4. Valdiani A, Hansen OK, Nielsen UB, Johannsen VK, Shariat M, Georgiev MI, et al.
    Crit Rev Biotechnol, 2018 Nov 15.
    PMID: 30431379 DOI: 10.1080/07388551.2018.1489778
    Bioreactors are engineered systems capable of supporting a biologically active situation for conducting aerobic or anaerobic biochemical processes. Stability, operational ease, improved nutrient uptake capacity, time- and cost-effectiveness, and large quantities of biomass production, make bioreactors suitable alternatives to conventional plant tissue and cell culture (PTCC) methods. Bioreactors are employed in a wide range of plant research, and have evolved over time. Such technological progress, has led to remarkable achievements in the field of PTCC. Since the classification of bioreactors has been extensively reviewed in numerous reviews, the current article avoids repeating the same material. Alternatively, it aims to highlight the principal advances in the bioreactor hardware s used in PTCC rather than classical categorization. Furthermore, our review summarizes the most significant steps as well as current state-of-the-art of PTCC carried out in various types of bioreactor.
  5. Hassan N, Ahmad T, Zain NM
    J Food Sci, 2018 Dec;83(12):2903-2911.
    PMID: 30440088 DOI: 10.1111/1750-3841.14370
    The issue of food authenticity has become a concern among religious adherents, particularly Muslims, due to the possible presence of nonhalal ingredients in foods as well as other commercial products. One of the nonhalal ingredients that commonly found in food and pharmaceutical products is gelatin which extracted from porcine source. Bovine and fish gelatin are also becoming the main commercial sources of gelatin. However, unclear information and labeling regarding the actual sources of gelatin in food and pharmaceutical products have become the main concern in halal authenticity issue since porcine consumption is prohibited for Muslims. Hence, numerous analytical methods involving chemical and chemometric analysis have been developed to identify the sources of gelatin. Chemical analysis techniques such as biochemical, chromatography, electrophoretic, and spectroscopic are usually combined with chemometric and mathematical methods such as principal component analysis, cluster, discriminant, and Fourier transform analysis for the gelatin classification. A sample result from Fourier transform infrared spectroscopy analysis, which combines Fourier transform and spectroscopic technique, is included in this paper. This paper presents an overview of chemical and chemometric methods involved in identification of different types of gelatin, which is important for halal authentication purposes.
    MeSH terms: Animals; Cattle; Fishes; Food Analysis; Gelatin/chemistry*; Islam; Swine; Spectroscopy, Fourier Transform Infrared; Principal Component Analysis; Biometric Identification*
  6. Sow, Yih Liang, Tang, Ing Ping, Kho, Jasmine, Narayanan, Prepagaran
    Medical Journal of Malaysia, 2018;73(4):244-248.
    MyJurnal
    Introduction: Endoscopic sinus surgery (ESS) is the mainstay for treatment of chronic rhinosinusitis versus maximal medical therapy. We propose a more economical option, by using steroid-impregnated Gelfoam instead of Nasopore post ESS, as it is less expensive and has showed effectiveness in preventing post-operative bleeding.

    Materials and methods: A randomised, double-blinded, placebo-controlled trial was carried out in eight patients with chronic rhinosinusitis or nasal polyposis who were planned for bilateral endoscopic sinus surgery. A Peri-operative Sinus Endoscopy (POSE) Score and Lund-Kennedy Endoscopic Score (LKES) were recorded. The use of hydrocortisone-impregnated Gelfoam dressing versus normal saline-impregnated Gelfoam dressing were compared. Scores were repeated post-operatively at one week, three weeks and three months interval.

    Results: For LKES, at the end of three months, 50% of the patients had the same score difference, 37.5% had better results on the study side while 12.5% had better results on the control side. Meanwhile, for POSE Score, at the end of three months, 75% of the patients had better score difference on the study side while 12.5% had better results on the control side.

    Conclusion: Gelfoam can be used as nasal packing material to deliver topical steroid after endoscopic sinus surgery. Steroid-impregnated nasal dressing after endoscopic sinus surgery may not provide better long-term outcome.
    MeSH terms: Bandages; Endoscopy; Gelatin Sponge, Absorbable; Humans; Hydrocortisone; Nasal Polyps; Paranasal Sinuses; Sinusitis
  7. Somidin F, Maeno H, Tran XQ, D McDonald S, Mohd Salleh MAA, Matsumura S, et al.
    Materials (Basel), 2018 Nov 09;11(11).
    PMID: 30423946 DOI: 10.3390/ma11112229
    In-situ observations of the polymorphic transformation in a single targeted Cu₆Sn₅ grain constrained between Sn-0.7 wt % Cu solder and Cu-Cu₃Sn phases and the associated structural evolution during a solid-state thermal cycle were achieved via a high-voltage transmission electron microscope (HV-TEM) technique. Here, we show that the monoclinic η'-Cu₆Sn₅ superlattice reflections appear in the hexagonal η-Cu₆Sn₅ diffraction pattern upon cooling to isothermal 140 °C from 210 °C. The in-situ real space imaging shows that the η'-Cu₆Sn₅ contrast pattern is initiated at the grain boundary. This method demonstrates a new approach for further understanding the polymorphic transformation behavior on a real solder joint.
  8. Amiri IS, Azzuhri SRB, Jalil MA, Hairi HM, Ali J, Bunruangses M, et al.
    Micromachines (Basel), 2018 Sep 11;9(9).
    PMID: 30424385 DOI: 10.3390/mi9090452
    Light has found applications in data transmission, such as optical fibers and waveguides and in optoelectronics. It consists of a series of electromagnetic waves, with particle behavior. Photonics involves the proper use of light as a tool for the benefit of humans. It is derived from the root word "photon", which connotes the tiniest entity of light analogous to an electron in electricity. Photonics have a broad range of scientific and technological applications that are practically limitless and include medical diagnostics, organic synthesis, communications, as well as fusion energy. This will enhance the quality of life in many areas such as communications and information technology, advanced manufacturing, defense, health, medicine, and energy. The signal transmission methods used in wireless photonic systems are digital baseband and RoF (Radio-over-Fiber) optical communication. Microwave photonics is considered to be one of the emerging research fields. The mid infrared (mid-IR) spectroscopy offers a principal means for biological structure analysis as well as nonintrusive measurements. There is a lower loss in the propagations involving waveguides. Waveguides have simple structures and are cost-efficient in comparison with optical fibers. These are important components due to their compactness, low profile, and many advantages over conventional metallic waveguides. Among the waveguides, optofluidic waveguides have been found to provide a very powerful foundation for building optofluidic sensors. These can be used to fabricate the biosensors based on fluorescence. In an optical fiber, the evanescent field excitation is employed to sense the environmental refractive index changes. Optical fibers as waveguides can be used as sensors to measure strain, temperature, pressure, displacements, vibrations, and other quantities by modifying a fiber. For some application areas, however, fiber-optic sensors are increasingly recognized as a technology with very interesting possibilities. In this review, we present the most common and recent applications of the optical fiber-based sensors. These kinds of sensors can be fabricated by a modification of the waveguide structures to enhance the evanescent field; therefore, direct interactions of the measurand with electromagnetic waves can be performed. In this research, the most recent applications of photonics components are studied and discussed.
    MeSH terms: Electricity; Electrons; Fiber Optic Technology; Fluorescence; Humans; Microwaves; Quality of Life; Refractometry; Spectrum Analysis; Temperature; Vibration; Biosensing Techniques; Photons; Optical Fibers; Chemistry Techniques, Synthetic
  9. Mahmodi H, Hashim MR, Soga T, Alrokayan S, Khan HA, Rusop M
    Materials (Basel), 2018 Nov 12;11(11).
    PMID: 30424494 DOI: 10.3390/ma11112248
    In this work, nanocrystalline Ge1-xSnx alloy formation from a rapid thermal annealed Ge/Sn/Ge multilayer has been presented. The multilayer was magnetron sputtered onto the Silicon substrate. This was followed by annealing the layers by rapid thermal annealing, at temperatures of 300 °C, 350 °C, 400 °C, and 450 °C, for 10 s. Then, the effect of thermal annealing on the morphological, structural, and optical characteristics of the synthesized Ge1-xSnx alloys were investigated. The nanocrystalline Ge1-xSnx formation was revealed by high-resolution X-ray diffraction (HR-XRD) measurements, which showed the orientation of (111). Raman results showed that phonon intensities of the Ge-Ge vibrations were improved with an increase in the annealing temperature. The results evidently showed that raising the annealing temperature led to improvements in the crystalline quality of the layers. It was demonstrated that Ge-Sn solid-phase mixing had occurred at a low temperature of 400 °C, which led to the creation of a Ge1-xSnx alloy. In addition, spectral photo-responsivity of a fabricated Ge1-xSnx metal-semiconductor-metal (MSM) photodetector exhibited its extending wavelength into the near-infrared region (820 nm).
    MeSH terms: Alloys; Cold Temperature; Humans; Male; Metals; Semiconductors; Silicon; Temperature; Vibration; X-Ray Diffraction; Homosexuality, Male; Phonons; Orientation, Spatial
  10. Dieng H, Satho T, Abang F, Miake F, Azman FAB, Latip NA, et al.
    Indian J Med Res, 2018 Sep;148(3):334-340.
    PMID: 30425225 DOI: 10.4103/ijmr.IJMR_1604_16
    Background & objectives: In sterile insect technology (SIT), mating competitiveness is a pre-condition for the reduction of target pest populations and a crucial parameter for judging efficacy. Still, current SIT trials are being hindered by decreased effectiveness due to reduced sexual performance of released males. Here, we explored the possible role of a herbal aphrodisiac in boosting the mating activity of Aedes aegypti.

    Methods: Males were fed one of two diets in this study: experimental extract of Eurycoma longifolia (MSAs) and sugar only (MSOs). Differences in life span, courtship latency, copulation activity and mating success were examined between the two groups.

    Results: No deaths occurred among MSA and MSO males. Life span of MSOs was similar to that of MSAs. The courtship latency of MSAs was shorter than that of MSOs (P<0.01). MSAs had greater copulation success than MSOs (P<0.001). In all female treatments, MSAs mated more than MSOs, but the differences in rate were significant only in the highest female density (P<0.05). In MSAs, mating success varied significantly with female density (P<0.01), with the 20-female group (P<0.01) having the lowest rate. Single MSA had better mating success at the two lowest female densities. In MSOs, there were no significant differences in mating success rate between the different female densities.

    Interpretation & conclusions: Our results suggested that the herbal aphrodisiac, E. longifolia, stimulated the sexual activity of Ae. aegypti and may be useful for improving the mating competitiveness of sterile males, thus improving SIT programmes.

    MeSH terms: Aedes/drug effects; Aedes/physiology; Animals; Aphrodisiacs/pharmacology*; Copulation/drug effects; Insecticides/pharmacology; Insects; Insemination/drug effects; Mosquito Control; Pest Control, Biological/methods*; Eurycoma*
  11. Rameshkumar MR, Arunagirinathan N, Swathirajan CR, Vignesh R, Balakrishnan P, Solomon SS
    Indian J Med Res, 2018 09;148(3):341-344.
    PMID: 30425226 DOI: 10.4103/ijmr.IJMR_730_17
    MeSH terms: Adult; Humans; India/epidemiology; Male; Microbial Sensitivity Tests/methods; Patient Selection; Drug Resistance, Bacterial/drug effects; Drug Resistance, Bacterial/genetics
  12. Sharma S, Kc B, Khatri A
    J Multidiscip Healthc, 2018;11:601-608.
    PMID: 30425506 DOI: 10.2147/JMDH.S176267
    INTRODUCTION: Male involvement in reproductive health is an essential component in promoting maternal and family health. In Nepal, men are not actively engaged in most maternal and child health (MCH) services nor in other reproductive health programs. There is a need to know about the understanding of key professionals in such practices. This study explores gendered perspectives among teachers and health professionals to understand the factors contributing to male involvement in reproductive health.

    METHODS: The data were collected through two focus group discussions (FGDs) and seven key informant interviews (KIIs). FGDs were held among male teachers of selected schools, and KIIs were conducted with health professionals of the health post of Bungamati, Lalitpur. An unstructured interview guide was used to explore their experiences and perceptions. All KIIs and FGDs were recorded, translated and transcribed verbatim.

    RESULTS: Findings show limited male involvement in reproductive health. Participants reported several hindering and challenging factors such as sociocultural and psychological norms, lack of education, and misinformation and dominance of female as health care providers in many MCH clinics. Perceived motivating factors included positive attitude in men, literacy and awareness, inclusion of reproductive health in school curriculum and certain incentives. Participants also recommended a range of strategies for increasing men's involvement in reproductive health in Nepal.

    CONCLUSION: Men's education and attitude, knowledge and awareness, sociocultural factors, psychological factors, health system factors, and policies play important roles in male involvement in reproductive health. Programs on effective implementation of men involvement in reproductive health initiatives should address the barriers and challenges to men's supportive activities. This study also suggests increasing literacy of reproductive health among men that enhances their positivity and motivates them to participate in reproductive health services.

  13. Vijayan R, Afshan G, Bashir K, Cardosa M, Chadha M, Chaudakshetrin P, et al.
    J Pain Res, 2018;11:2567-2575.
    PMID: 30425567 DOI: 10.2147/JPR.S162296
    Background: The supply of controlled drugs is limited in the Far East, despite the prevalence of health disorders that warrant their prescription. Reasons for this include strict regulatory frameworks, limited financial resources, lack of appropriate training amongst the medical profession and fear of addiction in both general practitioners and the wider population. Consequently, the weak opioid tramadol has become the analgesic most frequently used in the region to treat moderate to severe pain.

    Methods: To obtain a clearer picture of the current role and clinical use of tramadol in Southeast Asia, pain specialists from 7 countries in the region were invited to participate in a survey, using a questionnaire to gather information about their individual use and experience of this analgesic.

    Results: Fifteen completed questionnaires were returned and the responses analyzed. Tramadol is used to manage acute and chronic pain caused by a wide range of conditions. Almost all the specialists treat moderate cancer pain with tramadol, and every one considers it to be significant or highly significant in the treatment of moderate to severe non-cancer pain. The reasons for choosing tramadol include efficacy, safety and tolerability, ready availability, reasonable cost, multiple formulations and patient compliance. Its safety profile makes tramadol particularly appropriate for use in elderly patients, outpatients, and for long-term treatment. The respondents strongly agreed that tighter regulation of tramadol would reduce its medical availability and adversely affect the quality of pain management. In some countries, there would no longer be any appropriate medication for cancer pain or the long-term treatment of chronic pain.

    Conclusions: In Southeast Asia, tramadol plays an important part in the pharmacological management of moderate to severe pain, and may be the only available treatment option. If it were to become a controlled substance, the standard of pain management in the region would decline.
    MeSH terms: Aged; Analgesics; Analgesics, Opioid; Asia, Southeastern; Far East; Fear; Humans; Malaysia; Outpatients; Patient Compliance; Surveys and Questionnaires; Specialization; Tramadol; Prevalence; Prescriptions; General Practitioners; Chronic Pain; Pain Management; Controlled Substances; Cancer Pain
  14. Saini S, Thakur CJ, Kumar V, Tandon S, Bhardwaj V, Maggar S, et al.
    Mol Biol Res Commun, 2018 Sep;7(3):107-118.
    PMID: 30426028 DOI: 10.22099/mbrc.2018.29577.1322
    Current re-emergence of Nipah virus (NiV) in India caused 11 deaths so far and many patients were kept in quarantine. A thorough study of previous outbreaks occurred in Malaysia, Bangladesh and India represents cases with high rate of fatality due to acute encephalitis. Our work involves genome analysis of NiV for prediction of miRNAs and their targeted genes in human in order to understand encephalitis origin. Ab-intio program-VMir was used for initial screening of genome, obtained nine pre-miRNAs was analyzed by ViralMir to check for any pseudo pre-miRNAs. Eighteen functional mature miRNAs were extracted from pre-miRNAs by using Mature-Bayes tool, which targets 669 genes in human genome as retrieved by miRDB. Gene ontology terms by PANTHER provide important pathways in which target genes were involved like Axon guidance, T cell activation, and nicotinic acetylcholine receptor signaling. Significant outcome was obtained after NCBI Gene and OMIM database mining and literature search for predicted target genes. TLR3, TJP1, NOTCH2, FHL1, and GRIA3 target genes obtained showed their involvement in host defense, blood brain barrier, neurogenesis, mental retardation and encephalitis. To conclude, we predicted significant genes in human that can be inhibited by miRNAs of NiV and results in etiology of encephalitis.
    MeSH terms: Animals; Bangladesh; Bayes Theorem; Blood-Brain Barrier; Disease Outbreaks; Encephalitis; Humans; India; Malaysia; Intellectual Disability; Quarantine; Receptors, Nicotinic; T-Lymphocytes; Signal Transduction; Genome, Human; Databases, Genetic; MicroRNAs; Nipah Virus; Panthera; Receptor, Notch2; Gene Ontology; Axon Guidance
  15. Yasir SF, Jani J, Mukri M
    Data Brief, 2018 Dec;21:907-910.
    PMID: 30426044 DOI: 10.1016/j.dib.2018.10.057
    In the study, a relationship was establishment between electrical resistivity by using electrical resistivity imaging (ERI) technique with hydraulic conductivity. By using Schlumberger array configuration, 2D electrical resistivity image was produced by using ABEM SAS 4000 with eighty-one (81) electrodes (Loke, 2004) [1]. By using regression equation, hydraulic conductivity was calculated from electrical resistivity and this result was compared with the hydraulic conductivity obtained from pumping tests (Butler, 2005). This data suggested that electrical resistivity survey can be used as preliminary tool to assess any subsurface zone with non- invasive nondestructive for soil, reducing time and cost.
    MeSH terms: Electricity; Electrodes; Surveys and Questionnaires; Soil
  16. Elochukwu H, Sia LKSL, Gholami R, Hamid MA
    Data Brief, 2018 Dec;21:972-979.
    PMID: 30426054 DOI: 10.1016/j.dib.2018.10.055
    Data presented in this article focused on the application of Methyl Ester Sulphonate (MES) surfactant and nanopolystyrene in water based drilling fluid. Data from rheology study using Bingham and Power law models showed that the synergy of MES and nanopolystyrene improved the formulated drilling fluid. Filtration study under LPLT and HPHT conditions showed that MES and nanopolystyrene drilling fluid reduced filtration loss by 50.7% at LPLT and 61.1% at HPHT conditions. These filtration data were validated by filter cake permeability and scanning electron microscope images.
    MeSH terms: Benzenesulfonates; Filtration; Microscopy, Electron, Scanning; Permeability; Rheology; Surface-Active Agents; Water
  17. Alavi M, Seng JH, Mustaffa MS, Ninggal MT, Amini M, Latif AA
    Percept Mot Skills, 2018 Nov 14.
    PMID: 30426868 DOI: 10.1177/0031512518809163
    Although several studies have examined the relationships among attention, impulse control, gender, and academic achievement, most have focused on clinical samples and have considered only one or two academic subjects. This study investigated these relationships among typically developing children using general achievement measures (academic scores and grades). Our participants were 270 typically developing primary school students (142 boys and 128 girls) of different nationalities living in Malaysia, recruited with purposive sampling with a mean age of 9.75 years. We found that both attention and impulse control significantly predicted academic achievement. Girls had a higher level of attention and impulse control than boys, but gender was not a significant moderator between either attention or impulse control and academic achievement. We discuss the implications of these findings and the need for further research.
    MeSH terms: Achievement; Attention; Child; Ethnic Groups; Female; Gender Identity; Humans; Malaysia; Male; Schools; Students
  18. Mohamed Ibrahim N, Ramli R, Koya Kutty S, Shah SA
    Mov Disord, 2018 12;33(12):1967-1968.
    PMID: 30427552 DOI: 10.1002/mds.27526
    MeSH terms: Aged; Antiparkinson Agents/therapeutic use*; Diabetes Mellitus/drug therapy; Female; Humans; Levodopa/therapeutic use*; Male; Middle Aged; Motor Activity/physiology; Parkinson Disease/complications; Parkinson Disease/diagnosis; Parkinson Disease/drug therapy*; Parkinsonian Disorders/complications*; Parkinsonian Disorders/drug therapy; Diabetes Complications/drug therapy*
  19. Chan LF, Eu CL, Soh SY, Maniam T, Shahidii Kadir Z, Chong BTW, et al.
    J Psychiatr Pract, 2018 07;24(4):279-291.
    PMID: 30427812 DOI: 10.1097/PRA.0000000000000316
    Ketamine has shown effectiveness as a rapid-acting antidepressant with antisuicidal effects in terms of reduction of suicidal ideation in the short term. However, the evidence for long-term maintenance ketamine therapy for treatment-resistant depression (TRD) and suicidal behavior is limited. This case series (N=13) highlights the role of adjunctive serial maintenance ketamine infusions in restoring functionality in treatment-resistant unipolar and bipolar (mixed) depression with significant suicide risk and multiple comorbidities, including alcohol dependence. Two cases of TRD achieved functional remission with long-term maintenance ketamine treatment. The first case illustrates the potential synergistic interaction between ketamine and lamotrigine to achieve a sustained antidepressant response in the patient for 7 months. The second case may possibly be the longest reported case of maintenance ketamine therapy, with treatment continuing for 5 years to date. Ketamine treatment showed acute effectiveness in another 7 cases, especially in terms of reduction of suicidal ideation, albeit without significant long-term antidepressant effect. Factors that may contribute to lack of effectiveness of serial ketamine include inadequate mood stabilization in TRD in bipolar spectrum diagnoses, concomitant benzodiazepine use, complex comorbidities, and adverse effects such as significant hypertension and severe dissociation. Future systematic controlled studies are warranted to establish the efficacy and safety profile of long-term ketamine as maintenance therapy for TRD with suicidal behavior.
    MeSH terms: Adult; Antidepressive Agents/administration & dosage*; Bipolar Disorder/drug therapy*; Depressive Disorder, Major/drug therapy*; Female; Humans; Ketamine/administration & dosage*; Middle Aged; Suicide, Attempted/prevention & control*; Depressive Disorder, Treatment-Resistant/drug therapy*
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