Rudolf Pfab

Publications of Rudolf Pfab

• Clinical and analytical features of severe suicidal quetiapine overdoses--a retrospective cohort study.

  Authors: Florian Eyer, Rudolf Pfab, Norbert Felgenhauer, Tim Strubel, Bernd Saugel, Thomas Zilker

  Clinical toxicology (Philadelphia, Pa.). 11/2011; 49(9):846-53.

  Detailed data on severe overdoses with quetiapine are relatively sparsely reported in the literature. To describe a cohort of 20 acute quetiapine overdoses and provide additional data on theDetailed data on severe overdoses with quetiapine are relatively sparsely reported in the literature. To describe a cohort of 20 acute quetiapine overdoses and provide additional data on the pharmacokinetics and clinical features of intoxication with this drug. A retrospective study was conducted on patients with quetiapine poisoning admitted to our institution. We included moderate to severe overdoses between 2005-2011 who required admission to ICU. Predominantly female patients (n = 17) ingested a median dose of 9.8 g quetiapine. Poison Severity Score was moderate in 9 patients, severe in 10 patients and in one case fatal. Quetiapine was analytically confirmed in all cases. Clinical manifestations included drowsiness or coma (all patients), tachycardia (12 patients) and hypotension (10 patients). Seizures and arrhythmia occurred in 4 patients, each. Intubation and mechanical ventilation was required in 14 patients due to seizures, respiratory depression or loss of airway protection and 15 patients developed pneumonia. Hypokalaemia and hyperglycaemia were present at admission in 10 and 5 patients, respectively. Despite frequent prolongation of the QT(c) in 13 patients, QT interval was normal in most cases and QRS-interval was prolonged in only one patient. Presumably anticholinergic delirium was recognised in 8 patients and 6 patients received physostigmine with good clinical response. In 13 cases quetiapine was analysed quantitatively in serum with a relevantly prolonged half-life (16 ± 12 h) and a median peak serum concentration of 3074 ng/mL. In 4 of these 13 patients we observed an increase of quetiapine serum concentration in the further course. In this study, quetiapine overdoses were associated with significant toxicity and a fairly high number of complications. A careful and often prolonged clinical observation in the more severe cases of overdose seems mandatory.

• Case series: Alcohol intolerance with Coprine-like syndrome after consumption of the mushroom Lepiota aspera (Pers.:Fr.) Quél., 1886 (Freckled Dapperling).

  Authors: Bettina Haberl, Rudolf Pfab, Sigmar Berndt, Christoph Greifenhagen, Thomas Zilker

  Clinical toxicology (Philadelphia, Pa.). 02/2011; 49(2):113-4.

  Alcohol intolerance after consumption of wild mushrooms is a recognized phenomenon. This is best understood with Coprinus atramentarius. Its active component Coprine blocks enzymatic ethanolAlcohol intolerance after consumption of wild mushrooms is a recognized phenomenon. This is best understood with Coprinus atramentarius. Its active component Coprine blocks enzymatic ethanol degradation at the stage of acetaldehyde, which is responsible for the well-recognized symptoms. Here, we report three events in five patients experiencing the same symptoms after consumption of self-collected Lepiota aspera. All had mistaken L. aspera for edible mushrooms as Amanita rubescens or Macrolepiota procera. In all events, L. aspera was identified by mycologists and no other mushrooms were involved. The mushrooms were well sautéed and tolerated well until an alcoholic beverage was consumed. Then within few minutes facial flushing, throbbing headache, tachycardia, and shortness of breath all occurred. The symptoms abated within a few hours with no sequelae but could be re-provoked by further alcohol consumption up to 48 h later. This syndrome appears to be identical with the one known from C. atramentarius. However, the toxin in L. aspera or its mechanism is not yet known.

• Lithium poisoning: pharmacokinetics and clearance during different therapeutic measures.

  Authors: Florian Eyer, Rudolf Pfab, Norbert Felgenhauer, Jens Lutz, Uwe Heemann, Werner Steimer, Sabine Zondler, Burkhard Fichtl, Thomas Zilker

  Journal of clinical psychopharmacology. 07/2006; 26(3):325-30.

  The clinical features and pharmacokinetics of 22 lithium overdoses are described. Effectiveness of different treatment regimens regarding elimination of lithium is discussed. Origin of overdose wasThe clinical features and pharmacokinetics of 22 lithium overdoses are described. Effectiveness of different treatment regimens regarding elimination of lithium is discussed. Origin of overdose was due to deliberate poisoning or precipitated by concomitant diseases, coadministration of drugs, or combination of both. Treatment included supportive care, diuretics (15/22), hemodialysis (HD; 9/22), and mechanical ventilation (3/22). Severity of lithium intoxication was classified in 50% as I degrees, in 41% as II degrees, and in 9% as III degrees according to Hansen and Amdisen. Renal impairment on admission was diagnosed in 82% of the patients. Half-life of lithium in serum was 3.5 +/- 0.8 hours during the first HD, and 29 +/- 14 and 29 +/- 6 hours during therapy with diuretics or supportive treatment, respectively. Lithium clearance during HD was 160 +/- 15 mL/min, and renal clearance during HD or treatment with diuretics was approximately 20 and 15 +/- 9 mL/min, respectively. Renal lithium clearance was not influenced by HD therapy. There was no difference regarding half-life and clearance between the group that had an unspecific treatment or the group treated with diuretics. Hemodialysis is the therapy of choice for emergent extracorporeal lithium elimination. Renal impairment and interaction with other drugs were the main reasons for intoxication; thus, more cautious prescription or more frequent supervision of this patient group is warranted. It seems that treatment with diuretics does not have a beneficial effect in the overdose setting.

• Neither DMPS nor DMSA is effective in quantitative elimination of elemental mercury after intentional IV injection.

  Authors: Florian Eyer, Norbert Felgenhauer, Rudolf Pfab, Gustav Drasch, Thomas Zilker

  Clinical toxicology (Philadelphia, Pa.). 02/2006; 44(4):395-7.

  BACKGROUND: Intravenous injection of elemental mercury (Hg) is rare and considered relatively harmless. Treatment recommendations vary and the effectiveness of chelation therapy is controversial.BACKGROUND: Intravenous injection of elemental mercury (Hg) is rare and considered relatively harmless. Treatment recommendations vary and the effectiveness of chelation therapy is controversial. CASE REPORT: A 27-year-old man intravenously injected 1.5 mL of elemental Hg. Within 12 hours he became febrile, tachycardic and dyspneic. Physical examination was unremarkable. X-rays showed scattered radiodense deposits in the lung, heart, intestinal wall, liver and kidney. The serum Hg level on admission was 172 microg/L and peaked on day 6 at 274 microg/L. Cumulative renal elimination during a five day oral treatment period with 2,3-dimercaptopropane-1-sulfonate (DMPS) and meso-2,3-dimercaptosuccinic acid (DMSA) was 8 mg and 3 mg, respectively. CONCLUSION: Although urinary excretion could be enhanced during chelation therapy, Hg deposits in organs resulted in negligible elimination of mercury compared to the exposed dose.

• Acute endosulfan poisoning with cerebral edema and cardiac failure.

  Authors: Florian Eyer, Norbert Felgenhauer, Elisabeth Jetzinger, Rudolf Pfab, Thomas R Zilker

  Journal of toxicology. Clinical toxicology. 02/2004; 42(6):927-32.

  BACKGROUND: Organochlorine insecticides are highly toxic compounds that are responsible for a number of severe intoxications worldwide with several deaths. Despite their widespread use in agricultureBACKGROUND: Organochlorine insecticides are highly toxic compounds that are responsible for a number of severe intoxications worldwide with several deaths. Despite their widespread use in agriculture during the 1940s to 1960s and the well-known signs and symptoms of intoxication, the clinical picture in case of poisoning varies. We report two cases of acute intentional endosulfan intoxication with cerebral edema and cardiac failure. CASE REPORTS: Both cases developed life-threatening signs like epileptic state, respiratory insufficiency and hemodynamic instability soon after ingestion. The survivor developed severe myocardial insufficiency and pulmonary edema documented by echocardiography and x-ray of the chest. The deceased patient developed severe cerebral edema and multiorgan failure ten days after ingestion of Thiodan 35. The peak serum concentration of endosulfan in the survivor was 0.12 mg/L approximately 23 hours after ingestion, whereas the peak blood concentration in the fatal case was 0.86 mg/L approximately 25 hours post-ingestion. Post-mortem endosulfan levels in different organs were determined. CONCLUSION: Endosulfan is a highly toxic organochlorine insecticide that produces well-known neurological symptoms of tonic-clonic convulsions, headache, dizziness and ataxia but also can cause gastrointestinal symptoms and metabolic disturbances. Life-threatening cerebral edema and hemodynamic instability may occur. Treatment is symptomatic and supportive.