Genitourinary toxicity of ketamine

ABSTRACT

Hong Kong Med J 2013;19:341–8 | Number 4, August 2013 | Epub 8 Jul 2013
DOI: 10.12809/hkmj134013
REVIEW ARTICLE
Genitourinary toxicity of ketamine
YB Wei, JR Yang, Z Yin, Q Guo, BL Liang, KQ Zhou
Department of Urology, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha 410011, Hunan, China
 
 
Ketamine is a relatively new recreational drug used by youngsters in recent decades. Its toxic effects on the genitourinary system were first reported in 2007, and now attract extensive attention from urologists, pharmacologists, and toxicologists all over the world. As many front-line health professionals and medical social workers are still unaware of this new clinical entity and an increasing number of the drug users seek help for urological symptoms, this mini-review aimed to summarise the clinical features and possible mechanisms of ketamine-induced genitourinary toxicity. By raising public awareness of these toxic effects, the authors hope that the contents of this review will be widely disseminated not only to medical professionals, but also to relevant government departments and the general public.
 
Key words: Cystitis; Hydronephrosis; Ketamine; Lower urinary tract symptoms; Toxicity
 
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Optimal delivery for preterm breech fetuses: is there any consensus?

ABSTRACT

Hong Kong Med J 2013;19:251–7 | Number 3, June 2013
DOI: 10.12809/hkmj133963
REVIEW ARTICLE
Optimal delivery for preterm breech fetuses: is there any consensus?
William WK To
Department of Obstetrics and Gynaecology, United Christian Hospital, Kwun Tong, Kowloon, Hong Kong
 
 
The optimal route for delivery of preterm breech-presenting fetuses remains a clinical dilemma. Available data from the literature are largely based on retrospective cohort studies, and randomised controlled trials are considered impossible to conduct. Consistently however, large population-based surveys have shown that planned caesarean sections for these fetuses were associated with better neonatal outcomes compared with those following vaginal delivery. Nevertheless, the increased surgical risks for the mother having caesarean delivery of an early preterm breech fetus must be balanced with the probable neonatal survival benefits. Planned caesarean section should probably be limited to gestations with at least a fair chance of independent neonatal survival, where vaginal delivery is not imminent, and in the absence of other maternal risk factors. Vaginal delivery would probably include those fetuses that are of marginal viability, and that additional protection from abdominal delivery was unlikely to be beneficial to neonatal outcome.
 
Key words: Cesarean section; Obstetric labor, premature
 
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Brugada syndrome

ABSTRACT

Hong Kong Med J 2013;19:159–67 | Number 2, April 2013
REVIEW ARTICLE
Brugada syndrome
Jessica Jellins, Mitchell Milanovic, David-Joel Taitz, SH Wan, PW Yam
School of Medicine, Sydney, The University of Notre Dame Australia, 160 Oxford Street, Darlinghurst NSW 2010, Australia
 
 
As a clinical entity the Brugada syndrome has existed since 1992 and has been associated with a high risk of sudden cardiac death predominately in younger males. Patients can present with symptoms (ie syncope, palpitations, aborted sudden cardiac death) and asymptomatically. Its three characteristic electrocardiographic patterns can occur both spontaneously or after provocation with sodium channel-blocking agents. Risk stratification and the need for treatment depend on the patient's symptoms, electrocardiography, family history, and electrophysiological inducibility to discern if treatment by implantable cardioverter defibrillator, the only effective treatment to date, is appropriate. This review focuses on Brugada syndrome and various aspects of the disease including proposed mechanisms, epidemiology, clinical presentations, genetics, diagnosis, risk stratification, and treatment options.
 
Key words: Brugada syndrome; Channelopathies; Death, sudden, cardiac
 
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Review on the use of insulin in primary care

ABSTRACT

Hong Kong Med J 2013;19:52–60 | Number 1, February 2013
REVIEW ARTICLE
Review on the use of insulin in primary care
PF Chan, Loretta KP Lai, SN Wong, David VK Chao, IT Lau
Department of Family Medicine and Primary Health Care, Kowloon East Cluster, Hospital Authority, Hong Kong
 
 
Diabetes mellitus is one of the major causes of premature morbidity and mortality. Studies show that intensive glycaemic control could significantly reduce the risk of diabetic complications. With the increasing number of diabetic patients under primary care indicated for insulin, family physicians will play a pivotal role in prescribing it in their setting. The initiation and titration of any insulin regimen is not difficult in most patients. With support from diabetes nurses and training on insulin use, family physicians can provide insulin therapy to diabetic patients in the community and reduce the number of referrals to secondary care. This article reviews the most updated clinical guidelines on insulin use to better equip family physicians on the initiation and titration of insulin in primary care.
 
Key words: Diabetes mellitus, type 2; Insulin; Physicians, family; Primary health care
 
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A new era in corneal transplantation: paradigm shift and evolution of techniques

ABSTRACT

Hong Kong Med J 2012;18:509–16 | Number 6, December 2012
REVIEW ARTICLE
A new era in corneal transplantation: paradigm shift and evolution of techniques
Alvin L Young, KW Kam, Vishal Jhanji, Lulu L Cheng, Srinivas K Rao
Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
 
 
Penetrating keratoplasty is the replacement of a diseased cornea with a full-thickness donor graft. In the last century, this 'gold standard' procedure was long established as the treatment of choice for various corneal diseases. The classical indications for a penetrating keratoplasty entailed optical, tectonic, therapeutic, and cosmetic issues. Over the past decade however, surgical advances have now enabled operations involving the cornea to be performed with a major shift in emphasis, such that penetrating keratoplasty has given way to lamellar (layered) keratoplasty. This review provides the latest updates on developments in the field of corneal transplantation and the nomenclature of different types of component surgery, particularly from the perspective of Hong Kong.
 
Key words: Corneal transplantation; Descemet stripping endothelial keratoplasty; Graft survival; Keratoplasty, penetrating
 
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Gastroesophageal reflux disease in children

ABSTRACT

Hong Kong Med J 2012;18:421–8 | Number 5, October 2012
REVIEW ARTICLE
Gastroesophageal reflux disease in children
XL Liu, Kenneth KY Wong
Department of Surgery, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong
 
 
Reflux of gastric contents is common in young infants but usually self-limiting and not pathological. Gastroesophageal reflux disease refers to persistent reflux due to pathological factors that results in significant symptoms. Patients may exhibit oesophagitis, bleeding, nutritional failure, or respiratory problems. A high index of suspicion must thus be maintained for all patients. The aim of this article was to provide a concise review of the understanding of this disease, and also to discuss current diagnosis and management strategies for children with gastroesophageal reflux disease.
 
Key words: Child; Fundoplication; Gastroesophageal reflux; Laparoscopy; Treatment outcome
 
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Diagnosing the cause of vertigo: a practical approach

ABSTRACT

Hong Kong Med J 2012;18:327–32 | Number 4, August 2012
REVIEW ARTICLE
Diagnosing the cause of vertigo: a practical approach
Alex TH Lee
Department of ENT, Tuen Mun Hospital, Tuen Mun, Hong Kong
 
 
Dizziness is among the commonest of chief complaints. It often presents a significant challenge to the attending physician, because the symptoms and signs are often vague and non-specific. However, a robust systematic approach can usually arrive at the diagnosis. Maintaining balance requires sensory inputs from the vestibular, visual, and somatosensory systems and the cerebellum fine-tunes inaccurate motor outputs. Causes of vertigo are most commonly otological, followed by central, somatosensory, and visual. The first question in approaching patients with dizziness is to categorise dizziness into one of the four groups: lightheadedness, pre-syncope, disequilibrium, and vertigo. Secondly, central vertigo has to be differentiated with peripheral vertigo. For peripheral vertigo, the most common cause is benign paroxysmal positional vertigo and should be specifically looked for. The tempo of the vertiginous attacks and other associated symptoms can help differentiate the other causes of peripheral vertigo, including Meniere's disease, vestibular neuronitis, labyrinthitis, and a perilymph fistula.
 
Key words: Benign paroxysmal positional vertigo; Dizziness; Reflex, vestibulo-ocular; Vertigo; Vestibular neuronitis
 
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Alzheimer’s disease: early diagnosis and treatment

ABSTRACT

Hong Kong Med J 2012;18:228–37 | Number 3, June 2012
REVIEW ARTICLE
Alzheimer’s disease: early diagnosis and treatment
LW Chu
Division of Geriatric Medicine, Department of Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
 
 
With ageing of populations, the worldwide population of persons with dementia will reach over 81 million by 2040, of which the most common cause is Alzheimer's disease. In recent years, there have been major advances in the understanding of its pathogenesis, methods to diagnose it, and treatment. Magnetic resonance brain imaging, cerebrospinal fluid biomarkers, and Pittsburgh compound B and fluorodeoxyglucose positron emission tomography of the brain can facilitate an accurate diagnosis of Alzheimer's disease in its early stage, and diagnose the mild cognitive impairment stage of Alzheimer's disease. At present, only symptomatic but not disease-modifying drug treatments are available. Donepezil, rivastigmine and galantamine are the currently approved cholinesterase inhibitors for the treatment of mild, moderate, and severe Alzheimer's disease. Overall, cholinesterase inhibitors show beneficial effects on cognition, activity of daily living, behaviour, and overall clinical rating. Memantine is another symptomatic treatment for moderate-to-severe Alzheimer's disease patients. It has a small beneficial effect on cognition, activity of daily living, behaviour, and overall clinical rating. Vitamin E has antioxidant properties, and may be used in some Alzheimer's disease patients without vascular risk factors. Concurrent non-pharmacological and psychosocial management of patients and their caregivers have a very important role. Disease-modifying therapies are still under development, whilst immunotherapy may be a viable option in the near future.
 
Key words: Alzheimer disease; Cholinesterase inhibitors; Diagnosis; Immunotherapy; Memantine
 
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Medication-induced acute angle closure attack

ABSTRACT

Hong Kong Med J 2012;18:139–45 | Number 2, April 2012
REVIEW ARTICLE
Medication-induced acute angle closure attack
Jimmy SM Lai, Rita A Gangwani
Eye Institute, The University of Hong Kong, Room 301, Level 3, Block B, 100 Cyberport Road, Cyberport 4, Hong Kong
 
 
OBJECTIVE. To review acute angle closure attacks induced by local and systemic medications.
 
DATA SOURCES. PubMed literature searches up to August 2011.
 
STUDY SELECTION. The following key words were used for the search: "drug", "iatrogenic", "acute angle closure glaucoma".
 
DATA EXTRACTION. A total of 86 articles were retrieved using the key words. Only those concerning acute angle closure attack triggered by local or systemic drug administration were included. For articles on the same or related topics, those published at later or more recent dates were selected. As a result, 44 articles were included and formed the basis of this review.
 
DATA SYNTHESIS. An acute attack of angle closure can be triggered by dilatation of the pupil, by anatomical changes in the ciliary body and iris, or by movement of the iris-lens diaphragm. Local and systemic medications that cause these changes have the potential to precipitate an attack of acute angle closure. The risk is higher in subjects who are predisposed to the development of angle closure. Many pharmaceutical agents including ophthalmic eyedrops and systemic drugs prescribed by general practitioners and various specialists (in psychiatry, otorhinolaryngology, ophthalmology, medicine, and anaesthesia) can precipitate an acute angle closure attack. The medications include: anti-histamines, anti-epileptics, antiparkinsonian agents, antispasmolytic drugs, mydriatic agents, sympathetic agents, and botulinum toxin.Since acute angle closure attack is a potentially blinding eye disease, it is extremely important to be vigilant and aware of ophthalmic and systemic medications that can lead to such attacks in predisposed subjects and to diagnose the condition when it occurs.
 
CONCLUSION. Since acute angle closure attack is a potentially blinding eye disease, it is extremely important to be vigilant and aware of ophthalmic and systemic medications that can lead to such attacks in predisposed subjects and to diagnose the condition when it occurs.
 
Key words: Acute disease; Anti-allergic agents; Glaucoma, angle-closure; Mydriatics; Vision disorders
 
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Reviewing evidences on the management of patients with motor neuron disease

ABSTRACT

Hong Kong Med J 2012;18:48–55 | Number 1, February 2012
REVIEW ARTICLE
Reviewing evidences on the management of patients with motor neuron disease
CN Lee
Department of Medicine, Pamela Youde Nethersole Eastern Hospital, 3 Lok Man Road, Chai Wan, Hong Kong
 
 
OBJECTIVE. To review evidences on the management of patients with motor neuron disease.
 
DATA SOURCES. PubMed literature searches from January 1982 up to January 2011.
 
STUDY SELECTION. Key words for literature search were "motor neuron disease review (MND)". Only the articles which concentrated on the ventilation, nutrition, cognitive or multidisciplinary approaches for motor neuron disease were included. Case reports were not included in the review. In addition, publications were identified using the World Wide Web from references in these papers. Only articles in English were considered.
 
DATA EXTRACTION. A total of 782 articles were retrieved using the key word search, of which 72 concentrated on ventilation, nutrition, cognitive or multidisciplinary approaches. From these, 43 articles were eventually included and formed the basis of this review.
 
DATA SYNTHESIS. Motor neuron disease is an adult-onset neurodegenerative disease that leads to weakness of limb, bulbar, and respiratory muscles. It displays an ethnic variation in incidence; 90% of cases are sporadic and 10% are familial. New diagnostic criteria have been proposed to increase diagnostic sensitivity. Proper clinical studies, electrophysiology, and neuroimaging are necessary before reaching a diagnosis of motor neuron disease. Riluzole remains the only disease-modifying drug approved for this disease; it prolongs life by 3 to 4 months. Multidisciplinary care units are important in the management of motor neuron disease patients. Non-invasive positive pressure ventilation prolongs life in motor neuron disease patients with respiratory failure. Enteral feeding is usually recommended for affected patients with malnutrition. Cognitive impairment is common in these patients, for whom a formal neuropsychiatric assessment is recommended. Appropriate palliative care is needed for these patients in order to improve their quality of dying.
 
CONCLUSION. Motor neuron disease is an incurable disease, for which a highly effective treatment is still pending. Symptomatic treatment remains the mainstay of management. A multidisciplinary approach embracing advances in non-invasive ventilation and gastrostomy can improve quality of life and extend the survival of motor neuron disease patients.
 
Key words: Amyotrophic lateral sclerosis; Motor neuron disease; Muscle weakness; Muscular atrophy; Riluzole
 
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