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Head and Neck Cancer: United Kingdom National Multidisciplinary Guidelines, Sixth Edition
- Jarrod J Homer, Stuart C Winter, Elizabeth C Abbey, Hiba Aga, Reshma Agrawal, Derfel ap Dafydd, Takhar Arunjit, Patrick Axon, Eleanor Aynsley, Izhar N Bagwan, Arun Batra, Donna Begg, Jonathan M Bernstein, Guy Betts, Colin Bicknell, Brian Bisase, Grainne C Brady, Peter Brennan, Aina Brunet, Val Bryant, Linda Cantwell, Ashish Chandra, Preetha Chengot, Melvin L K Chua, Peter Clarke, Gemma Clunie, Margaret Coffey, Clare Conlon, David I Conway, Florence Cook, Matthew R Cooper, Declan Costello, Ben Cosway, Neil J A Cozens, Grant Creaney, Daljit K Gahir, Stephen Damato, Joe Davies, Katharine S Davies, Alina D Dragan, Yong Du, Mark R D Edmond, Stefano Fedele, Harriet Finze, Jason C Fleming, Bernadette H Foran, Beth Fordham, Mohammed M A S Foridi, Lesley Freeman, Katherine E Frew, Pallavi Gaitonde, Victoria Gallyer, Fraser W Gibb, Sinclair M Gore, Mark Gormley, Roganie Govender, J Greedy, Teresa Guerrero Urbano, Dorothy Gujral, David W Hamilton, John C Hardman, Kevin Harrington, Samantha Holmes, Jarrod J Homer, Deborah Howland, Gerald Humphris, Keith D Hunter, Kate Ingarfield, Richard Irving, Kristina Isand, Yatin Jain, Sachin Jauhar, Sarra Jawad, Glyndwr W Jenkins, Anastasios Kanatas, Stephen Keohane, Cyrus J Kerawala, William Keys, Emma V King, Anthony Kong, Fiona Lalloo, Kirsten Laws, Samuel C Leong, Shane Lester, Miles Levy, Ken Lingley, Gitta Madani, Navin Mani, Paolo L Matteucci, Catriona R Mayland, James McCaul, Lorna K McCaul, Pádraig McDonnell, Andrew McPartlin, Valeria Mercadante, Zoe Merchant, Radu Mihai, Mufaddal T Moonim, John Moore, Paul Nankivell, Sonali Natu, A Nelson, Pablo Nenclares, Kate Newbold, Carrie Newland, Ailsa J Nicol, Iain J Nixon, Rupert Obholzer, James T O'Hara, S Orr, Vinidh Paleri, James Palmer, Rachel S Parry, Claire Paterson, Gillian Patterson, Joanne M Patterson, Miranda Payne, L Pearson, David N Poller, Jonathan Pollock, Stephen Ross Porter, Matthew Potter, Robin J D Prestwich, Ruth Price, Mani Ragbir, Meena S Ranka, Max Robinson, Justin W G Roe, Tom Roques, Aleix Rovira, Sajid Sainuddin, I J Salmon, Ann Sandison, Andy Scarsbrook, Andrew G Schache, A Scott, Diane Sellstrom, Cherith J Semple, Jagrit Shah, Praveen Sharma, Richard J Shaw, Somiah Siddiq, Priyamal Silva, Ricard Simo, Rabin P Singh, Maria Smith, Rebekah Smith, Toby Oliver Smith, Sanjai Sood, Francis W Stafford, Neil Steven, Kay Stewart, Lisa Stoner, Steve Sweeney, Andrew Sykes, Carly L Taylor, Selvam Thavaraj, David J Thomson, Jane Thornton, Neil S Tolley, Nancy Turnbull, Sriram Vaidyanathan, Leandros Vassiliou, John Waas, Kelly Wade-McBane, Donna Wakefield, Amy Ward, Laura Warner, Laura-Jayne Watson, H Watts, Christina Wilson, Stuart C Winter, Winson Wong, Chui-Yan Yip, Kent Yip
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- Journal:
- The Journal of Laryngology & Otology / Volume 138 / Issue S1 / April 2024
- Published online by Cambridge University Press:
- 14 March 2024, pp. S1-S224
- Print publication:
- April 2024
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Ethnic Differences in Dose and Levels of Clozapine: Exploring Need for Any Specific Monitoring Needs
- Stephen Jiwanmall, Nilamadhab Kar, Akua Obuobie, Tanay Maiti, Deborah Lester, Kerry Mclaughlin, Thomas Hanson
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- Journal:
- BJPsych Open / Volume 9 / Issue S1 / July 2023
- Published online by Cambridge University Press:
- 07 July 2023, p. S136
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Aims
Clinical research shows that compared to Caucasian patients, Asian patients appear to have a lower clozapine dose requirement for clinical efficacy. Hence, appropriate dose adjustment should be considered in Asian patients receiving maintenance clozapine therapy. Secondly, studies in the UK report that Asian patients with treatment-resistant schizophrenia were less likely to receive clozapine than Caucasian patients. The objectives of this study were to find out the ethnic difference in dose and levels of clozapine in ethnic minority patient (BME (Black and minority ethnic) populations and to explore if there is a need for any specific monitoring.
MethodsDemographic (age, gender, and ethnicity) and clinical variables (diagnosis, clozapine dose, plasma level of clozapine and nor-clozapine, smoking status, side effect profile, and physical comorbidities) were collected from the electronic patient records and analysed.
ResultsThe sample consisted of 66 (56.4%) Caucasians, 22 (18.8%) Asians, 21 (17.9%) African-Caribbean, and 8 (6.8%) mixed ethnicity patients. Their age range was 19-80, with an average of 46.9 ±11.9 years.
Among the ethnic groups, age, clozapine, nor-clozapine level and QTc were comparable, except for the dose of clozapine; Caucasian had the highest dose (414.8±140.0 mg), followed by African-Caribbean (373.8±163.7 mg), Asian (333.8±121.2 mg) and mixed (260.7±110.7 mg) (F3.68, p<0.05). The difference remained significant when all the BME groups were combined as well.
Side effects such as hypersalivation, drowsiness, blurred vision, polyuria, sore throat, headache, vomiting (none), dizziness, difficulty passing urine, urine incontinence, flu-like symptoms, nausea, were comparable among ethnic groups.
There was no difference in smoking among the groups. Considering comorbidities compared to BME, Caucasians had significantly lower rate of hypertension (27.1% vs 9.1%, p<0.01); diabetes (18.6% vs 4.5%, p<0.05), however dyslipidemia (5.1% vs 3.0%) was comparable.
In addition to the above, the dose of clozapine was positively correlated with clozapine and norclozapine levels (p<0.05). Clozapine and norclozapine levels correlated significantly (p<0.001). Age was negatively correlated with norclozapine assay (p<0.05) and positively with the number of cigarettes. It appears as the age increases, the number of cigarettes goes up, and norclozapine levels come down.
ConclusionThere are a few variations of clozapine prescribing in different ethnic groups. Although the Caucasians had higher doses, they had comparable blood levels. A higher proportion of BME patients on clozapine had hypertension and diabetes, emphasizing metabolic risk. Our study findings suggest clozapine monitoring should look into ethnicity related risk factors.
Contributors
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- By Jeremy Ackerman, Polly Bijur, Hans Bradshaw, Ciaran J. Browne, John H. Burton, Lisa Calder, David Cline, Rita K. Cydulka, Deborah B. Diercks, James Ducharme, Megan L. Fix, Michel Galinski, Ula Hwang, Jonathan S. Ilgen, Andy Jagoda, Samuel Kim, Robert Knopp, Jason B. Lester, Adam Levine, Todd M. Listwa, Frank LoVecchio, Sharon E. Mace, Alan P. Marco, Catherine A. Marco, Chris McEachin, James R. Miner, Kalani Olmsted, Sohan Parekh, Peter Rosen, Michael S. Runyon, Michael T. Schultz, Adam J. Singer, Robert A. Swor, Joshua H. Tamayo-Sarver, Stephen H. Thomas, Michael Turturro, Michael Walta, Benjamin A. White, Beth Wicklund, Susan R. Wilcox, Nathanael Wood, Dale P. Woolridge, Andrew Worster, Janet Simmons Young, Kelly Young
- Edited by Stephen H. Thomas
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- Book:
- Emergency Department Analgesia
- Published online:
- 18 December 2009
- Print publication:
- 25 September 2008, pp viii-xii
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