Scientific letter
Severe, long-term hypoglycemia induced by co-trimoxazole in a patient with predisposing factors
Hipoglucemia grave y prolongada secundaria a cotrimoxazol en sujeto con factores predisponentes
Juan Caro
, Inmaculada Navarro-Hidalgo, Miguel Civera, José T. Real, Juan F. Ascaso
Corresponding author
Servicio de Endocrinología y Nutrición, Hospital Clínico Universitario de Valencia, Departamento de Medicina, Universitat de Valencia, Valencia, Spain
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Hypoglycemia or a side effect of continuous glucose monitoring?" "tienePdf" => "en" "tieneTextoCompleto" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "144" "paginaFinal" => "146" ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Crisis comicial en paciente diabética. ¿Hipoglucemia o efecto secundario de la monitorización continua de glucosa?" ] ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0005" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 1076 "Ancho" => 3065 "Tamanyo" => 161886 ] ] "descripcion" => array:1 [ "en" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Continuous glucose monitoring record. Blood glucose recording, pump activity, and alarms of the continuous glucose monitoring system are shown: (A) Alarms for low glucose readings. (B) Alarms for pump stop. (C) Alarms for discrepancy between the sensor-recorded and manual calibration values. (D) Time of seizure.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Valeria Alcántara, José María Cubero, Agustina Prados, Jesús Pérez Pérez, Rosa Corcoy" "autores" => array:5 [ 0 => array:2 [ "nombre" => "Valeria" "apellidos" => "Alcántara" ] 1 => array:2 [ "nombre" => "José María" "apellidos" => "Cubero" ] 2 => array:2 [ "nombre" => "Agustina" "apellidos" => "Prados" ] 3 => array:2 [ "nombre" => "Jesús" "apellidos" => "Pérez Pérez" ] 4 => array:2 [ "nombre" => "Rosa" "apellidos" => "Corcoy" ] ] ] ] ] "idiomaDefecto" => "en" "Traduccion" => array:1 [ "es" => array:9 [ "pii" => "S1575092211002981" "doi" => "10.1016/j.endonu.2011.06.010" "estado" => "S300" "subdocumento" => "" "abierto" => array:3 [ "ES" => false "ES2" => false "LATM" => false ] "gratuito" => false "lecturas" => array:1 [ "total" => 0 ] "idiomaDefecto" => "es" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1575092211002981?idApp=UINPBA00004N" ] ] "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S2173509312000347?idApp=UINPBA00004N" "url" => "/21735093/0000005900000002/v1_201305082342/S2173509312000347/v1_201305082342/en/main.assets" ] "en" => array:13 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">Scientific letter</span>" "titulo" => "Severe, long-term hypoglycemia induced by co-trimoxazole in a patient with predisposing factors" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "146" "paginaFinal" => "148" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Juan Caro, Inmaculada Navarro-Hidalgo, Miguel Civera, José T. Real, Juan F. Ascaso" "autores" => array:5 [ 0 => array:4 [ "nombre" => "Juan" "apellidos" => "Caro" "email" => array:1 [ 0 => "juancaro84@gmail.com" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">¿</span>" "identificador" => "cor0005" ] ] ] 1 => array:2 [ "nombre" => "Inmaculada" "apellidos" => "Navarro-Hidalgo" ] 2 => array:2 [ "nombre" => "Miguel" "apellidos" => "Civera" ] 3 => array:2 [ "nombre" => "José T." "apellidos" => "Real" ] 4 => array:2 [ "nombre" => "Juan F." "apellidos" => "Ascaso" ] ] "afiliaciones" => array:1 [ 0 => array:1 [ "entidad" => "Servicio de Endocrinología y Nutrición, Hospital Clínico Universitario de Valencia, Departamento de Medicina, Universitat de Valencia, Valencia, Spain" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Hipoglucemia grave y prolongada secundaria a cotrimoxazol en sujeto con factores predisponentes" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Hypoglycemia is among the most common acute complications in diabetic patients.<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">1,2</span></a> Its importance lies not only in its frequency, but also in its organ impact, as it may cause morbidity and mortality. Drugs used to treat diabetes mellitus, especially sulfonylureas and insulin, are the most common causes of hypoglycemia. Hypoglycemia may also be caused by other drugs such as co-trimoxazole or trimethoprim-sulfamethoxazole. In order to prevent hypoglycemia, it is essential to know the risk factors that may promote its occurrence.</p><p id="par0010" class="elsevierStylePara elsevierViewall">We report the case of an 83-year-old male patient who attended the emergency room of the hospital for sudden loss of muscle tone and mucosal and skin pallor. Digital glycemia (DG) measured at the time of the episode was 39<span class="elsevierStyleHsp" style=""></span>mg/dL. The patient had no palpitations, blurred vision, or loss of consciousness. His relatives reported no seizures, and there was no sphincter incontinence. The patient was reported to have decreased food intake in recent years because of a decreased appetite loss in the setting of chemotherapy. No increase in usual physical activity, vomiting, or changes in bowel habits were reported. The patient had no clinical signs or symptoms of infection or fever during the days prior to the episode. His relatives reported that treatment with glipizide had been discontinued 4 days earlier because fasting blood glucose levels of 80–100<span class="elsevierStyleHsp" style=""></span>mg/dL had been found.</p><p id="par0015" class="elsevierStylePara elsevierViewall">The patient's clinical history included large B-cell lymphoma of the right testis, for which radical orchidectomy had been performed four months before the event. At the time of evaluation, the patient was receiving chemotherapy consisting of the CVP-R scheme (cisplatin, vincristine, prednisone, and rituximab) plus granulocyte colony-stimulating factor (G-CSF). Three cycles had been completed, of which the last had ended 10 days before the episode. As prophylaxis for opportunistic infections, the patient was being treated with co-trimoxazole (trimethoprim/sulfamethoxazole 160/800<span class="elsevierStyleHsp" style=""></span>mg) every 12<span class="elsevierStyleHsp" style=""></span>h on Saturdays and Sundays. His clinical history included high blood pressure treated with candesartan 16<span class="elsevierStyleHsp" style=""></span>mg/day, type 2 diabetes mellitus treated with glipizide 5<span class="elsevierStyleHsp" style=""></span>mg/8<span class="elsevierStyleHsp" style=""></span>h, which he had not taken for 4 days, dyslipidemia treated with gemfibrozil 900<span class="elsevierStyleHsp" style=""></span>mg/day, and hyperuricemia treated with allopurinol 300<span class="elsevierStyleHsp" style=""></span>mg/day.</p><p id="par0020" class="elsevierStylePara elsevierViewall">A physical examination showed skin pallor. Weight was 63.4<span class="elsevierStyleHsp" style=""></span>kg and height 1.78<span class="elsevierStyleHsp" style=""></span>m, body mass index 20.0<span class="elsevierStyleHsp" style=""></span>kg/m<span class="elsevierStyleSup">2</span>, blood pressure levels 102/62<span class="elsevierStyleHsp" style=""></span>mm<span class="elsevierStyleHsp" style=""></span>Hg, and heart rate 62<span class="elsevierStyleHsp" style=""></span>bpm. Neurological examination by systems was normal. The results of supplemental tests performed at the emergency room included: blood glucose 28<span class="elsevierStyleHsp" style=""></span>mg/dL; uremia 54<span class="elsevierStyleHsp" style=""></span>mg/dL; creatinine 1.72<span class="elsevierStyleHsp" style=""></span>mg/dL; creatinine clearance (ClCr), as estimated by the Modification of Diet in Renal Disease formula, of 42<span class="elsevierStyleHsp" style=""></span>mL/min. Kidney function tests performed two weeks earlier showed ClCr of 76<span class="elsevierStyleHsp" style=""></span>mL/min. All other tests requested were normal.</p><p id="par0025" class="elsevierStylePara elsevierViewall">Treatment was started with 10% intravenous glucose at 150<span class="elsevierStyleHsp" style=""></span>mL/h. However, his blood glucose level measured 1<span class="elsevierStyleHsp" style=""></span>h later was 25<span class="elsevierStyleHsp" style=""></span>mg/dL, and an increase in the infusion rate was required. During the 8<span class="elsevierStyleHsp" style=""></span>h the patient stayed at the emergency room, he was administered 274<span class="elsevierStyleHsp" style=""></span>g of glucose, which allowed for the slow, progressive normalization of plasma glucose. Oral intake and intravenous glucose were continued during his hospital stay, with a gradual reduction of the infusion rate. On the first day of admission, 247.8<span class="elsevierStyleHsp" style=""></span>g of glucose were administered. The total amount administered in the first 24<span class="elsevierStyleHsp" style=""></span>h was therefore 512<span class="elsevierStyleHsp" style=""></span>g of glucose, and blood glucose level at 24<span class="elsevierStyleHsp" style=""></span>h was 88<span class="elsevierStyleHsp" style=""></span>mg/dL. During the following 2 days, 281.4<span class="elsevierStyleHsp" style=""></span>g and 42<span class="elsevierStyleHsp" style=""></span>g of glucose were administered, respectively. Despite this, the patient had mean plasma blood glucose levels of 95<span class="elsevierStyleHsp" style=""></span>mg/dL. Additional tests showed significantly improved kidney function (urea 28<span class="elsevierStyleHsp" style=""></span>mg/dL; creatinine 0.95<span class="elsevierStyleHsp" style=""></span>mg/dL; ClCr 74<span class="elsevierStyleHsp" style=""></span>mL/min) and good glycemic control (glycosylated hemoglobin 6.9%). Plasma tests showed the following levels: insulin 3.2<span class="elsevierStyleHsp" style=""></span>μg/mL; C-peptide 2.2<span class="elsevierStyleHsp" style=""></span>ng/mL. It should be noted that these tests were performed after IV glucose infusion for 48<span class="elsevierStyleHsp" style=""></span>h and with normal glucose levels (134<span class="elsevierStyleHsp" style=""></span>mg/dL). Glipizide was ruled out as the cause of hypoglycemia because it had been discontinued 72<span class="elsevierStyleHsp" style=""></span>h before the episode. The half-life of the drug is 12<span class="elsevierStyleHsp" style=""></span>h, but it is increased to 24<span class="elsevierStyleHsp" style=""></span>h in kidney failure. This makes the implication of glipizide in the origin of hypoglycemia unlikely. Based on a clinical suspicion of hypoglycemia induced by co-trimoxazole, the hematology department was requested to assess drug rechallenge, and permanent drug discontinuation was decided upon. The patient was discharged from hospital with normal blood glucose levels and a stable clinical condition.</p><p id="par0030" class="elsevierStylePara elsevierViewall">First of all, it should be noted that hypoglycemia was not adequately studied. To make a diagnosis, it is important to measure sulfonylurea levels in urine, as well as C-peptide and insulin in plasma at the time of hypoglycemia. Both measurements were not adequately made, which makes final diagnosis difficult. There are however adequate data to establish that co-trimoxazole triggered hypoglycemia. The patient suffered severe hypoglycemia (28<span class="elsevierStyleHsp" style=""></span>mg/dL). This decreased plasma blood glucose level occurred in the setting of transient renal failure; ClCr at the emergency room was 42<span class="elsevierStyleHsp" style=""></span>mL/min, as compared to a prior clearance of 76<span class="elsevierStyleHsp" style=""></span>mL/min. It was also difficult to achieve adequate blood glucose levels in the first few hours despite the administration of intravenous glucose at high doses (512<span class="elsevierStyleHsp" style=""></span>g in the first 24<span class="elsevierStyleHsp" style=""></span>h). The discontinuation of glipizide 72<span class="elsevierStyleHsp" style=""></span>h before the episode rules out this drug as a potential cause of hypoglycemia because its half-life, even in renal failure, is shorter than 72<span class="elsevierStyleHsp" style=""></span>h. Finally, the plasma insulin levels of the patient were normal in the presence of normal blood glucose and high-dose intravenous glucose infusion. All of these data represent a clinical presentation that supports this diagnosis.</p><p id="par0035" class="elsevierStylePara elsevierViewall">As already stated, drugs are the most important cause of hypoglycemia. The most important drugs inducing hypoglycemia are those used to treat diabetes mellitus,<a class="elsevierStyleCrossRefs" href="#bib0015"><span class="elsevierStyleSup">3,4</span></a> but there are up to 164 drugs related to this event. According to a review by Cryer et al.,<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> these drugs are classified into three groups: moderate, low, and very low level of evidence. Co-trimoxazole is included in the last group.</p><p id="par0040" class="elsevierStylePara elsevierViewall">Co-trimoxazole is a combination of two antimicrobial drugs, trimethoprim and sulfamethoxazole, which act synergistically.<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5,6</span></a> The most important study of its hypoglycemic effect is a review of 14 cases where hypoglycemia caused by co-trimoxazole was found.<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> This study supports our diagnosis because it reported initial characteristics similar to those of the case discussed here. Aggravating factors for the development of hypoglycemia were first analyzed. Renal function worsening concomitant with the start of hypoglycemia was found in 93% of cases. Our patient had a ClCr of 42<span class="elsevierStyleHsp" style=""></span>mL/min, as compared to 73<span class="elsevierStyleHsp" style=""></span>mL/min at baseline. Another related factor was the presence of an additional hypoglycemic drug (43%). As regards to co-trimoxazole dosage, double the standard doses were used in up to 50% of reported cases. The mean blood glucose level measured in recruited patients was 25<span class="elsevierStyleHsp" style=""></span>mg/dL, with a range of 18–33<span class="elsevierStyleHsp" style=""></span>mg/dL. The reported patient also had severe hypoglycemia, with a blood glucose level of 28<span class="elsevierStyleHsp" style=""></span>mg/dL. Hyperinsulinemia was found in 88% of the patients tested (7 out of 8), while high C-peptide levels were found in all 5 patients tested. All the patients reviewed had clinical signs. More than one-third of the patients experienced neuroglycopenic symptoms such as seizures, confusion, or loss of consciousness. Our reported patient also had glycopenic clinical signs. The course of these patients is also noteworthy. They all required intravenous glucose infusion, but almost half of them (43%) had blood glucose levels in the lower limit of normal despite high-dose glucose infusion (>25<span class="elsevierStyleHsp" style=""></span>g glucose/h). This also occurred in our reported patient, who required high doses of intravenous glucose (>500<span class="elsevierStyleHsp" style=""></span>g glucose during the first 24<span class="elsevierStyleHsp" style=""></span>h). Despite this, blood glucose normalization was difficult. Finally, most subjects (86%) included in the review were discontinued treatment with co-trimoxazole to prevent new episodes of hypoglycemia.<a class="elsevierStyleCrossRefs" href="#bib0040"><span class="elsevierStyleSup">8,9</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">Hughes et al.<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> reported a patient with acquired immunodeficiency syndrome who started treatment with co-trimoxazole and levofloxacin 500<span class="elsevierStyleHsp" style=""></span>mg for pneumonitis. Six days later, the patient experienced severe hypoglycemia requiring high doses of intravenous glucose for normalization. High insulin and C-peptide levels were found (30.2<span class="elsevierStyleHsp" style=""></span>mU/L and 4.2<span class="elsevierStyleHsp" style=""></span>nmol/L respectively). Shattner et al.<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> reported a 34-year-old male patient, also with AIDS, who experienced hypoglycemia induced by co-trimoxazole in the setting of severe malnutrition.</p><p id="par0050" class="elsevierStylePara elsevierViewall">The mechanism of action by which co-trimoxazole is assumed to cause hypoglycemia is as follows. Co-trimoxazole belongs to the sulfonamide class and is therefore biochemically similar to sulfonylureas. The increase of insulin secretion through its binding to beta cell receptors seems the most reasonable mechanism of action. However, hypoglycemia does not occur in the absence of other promoting factors. Kidney function impairment is the most significant triggering factor because it increases drug half-life. The use of greater than standard doses also aggravates the described mechanism. This would result in an increased stimulation of pancreatic beta cells, and thus in higher plasma insulin levels. Nutritional patient status (often impaired in patients with acquired immunodeficiency syndrome and elderly and cancer patients) is another determinant factor in the occurrence of hypoglycemia. If the concomitant use of another glucose-lowering drug is added to these conditions, high insulin release will occur and will lead to severe and prolonged hypoglycemia.</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Conflicts of interest</span><p id="par0055" class="elsevierStylePara elsevierViewall">The authors state that they have no conflicts of interest.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:2 [ 0 => array:2 [ "identificador" => "sec0005" "titulo" => "Conflicts of interest" ] 1 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara">Please, cite this article as: Caro J, et al. Hipoglucemia grave y prolongada secundaria a cotrimoxazol en sujeto con factores predisponentes. Endocrinol Nutr. 2012;59:146–8.</p>" ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:11 [ 0 => array:3 [ "identificador" => "bib0005" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Hypoglycemia, functional brain failure, and brain death" "autores" => array:1 [ 0 => array:2 [ "etal" => false "autores" => array:1 [ 0 => "P.E. Cryer" ] ] ] ] ] "host" => array:1 [ 0 => array:2 [ "doi" => "10.1172/JCI31669" "Revista" => array:5 [ "tituloSerie" => "J Clin Invest" "fecha" => "2007" "volumen" => "117" "paginaInicial" => "868" "link" => array:1 [ 0 => array:2 [ "url" => "https://www.ncbi.nlm.nih.gov/pubmed/17404614" "web" => "Medline" ] ] ] ] ] ] ] ] 1 => array:3 [ "identificador" => "bib0010" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Evaluation. 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| Year/Month | Html | Total | |
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| 2020 December | 20 | 35 | 55 |
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| 2017 May | 23 | 20 | 43 |
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| 2017 March | 29 | 31 | 60 |
| 2017 February | 44 | 14 | 58 |
| 2017 January | 18 | 7 | 25 |
| 2016 December | 24 | 11 | 35 |
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| 2016 October | 28 | 12 | 40 |
| 2016 September | 16 | 7 | 23 |
| 2016 August | 11 | 4 | 15 |
| 2016 July | 17 | 3 | 20 |
| 2016 June | 13 | 6 | 19 |
| 2016 May | 15 | 6 | 21 |
| 2016 April | 20 | 19 | 39 |
| 2016 March | 21 | 13 | 34 |
| 2016 February | 15 | 24 | 39 |
| 2016 January | 10 | 18 | 28 |
| 2015 December | 14 | 15 | 29 |
| 2015 November | 26 | 22 | 48 |
| 2015 October | 16 | 36 | 52 |
| 2015 September | 21 | 23 | 44 |
| 2015 August | 18 | 12 | 30 |
| 2015 July | 12 | 5 | 17 |
| 2015 June | 10 | 1 | 11 |
| 2015 May | 22 | 17 | 39 |
| 2015 April | 16 | 19 | 35 |
| 2015 March | 8 | 13 | 21 |
| 2015 February | 5 | 16 | 21 |
| 2015 January | 31 | 6 | 37 |
| 2014 December | 55 | 9 | 64 |
| 2014 November | 16 | 1 | 17 |
| 2014 October | 43 | 9 | 52 |
| 2014 September | 29 | 3 | 32 |
| 2014 August | 34 | 3 | 37 |
| 2014 July | 50 | 5 | 55 |
| 2014 June | 31 | 4 | 35 |
| 2014 May | 26 | 7 | 33 |
| 2014 April | 19 | 3 | 22 |
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