Validation of international consensus equation for acute serum total tryptase in mast cell activation: A perioperative perspective.

There is no standardized method for assessing serum total mast cell tryptase (MCT) in anaphylaxis. The consensus equation (peak MCT should be>1.2× baseline tryptase+2 mg/L) has been proposed to interpret acute MCT in mast cell activation syndrome (MCAS). To validate consensus equation in a perioperative setting analyses of cases of suspected perioperative anaphylaxis during general anaesthesia (GA) were performed. Anaphylaxis was defined as per World Allergy Organisation (WAO) criteria. Timed serial MCT measurements were mapped against the consensus equation and receiver operating characteristic (ROC) curves produced. A total of 82 patients (60 females, mean age 56.5 years±SD17.2) underwent investigation. Sixty (73%) patients fulfilled WAO criteria for anaphylaxis, and 22 patients did not. Aetiology included 59% IgE-mediated anaphylaxis, 2% non-IgE-mediated anaphylaxis, 12% anaphylaxis of unknown cause and 27% deemed non-anaphylaxis. IgE-mediated anaphylaxis included the following: NMBA (35%), antibiotics (46%), chlorhexidine (8%), patent blue dye (8%) and others (8%). An acute MCT with a comparable baseline was available in 71 of 82 (87%) patients (60 anaphylaxis and 11 controls). The median interquartile range (IQR) time from reaction to peak MCT was 1.34 (0.82-2.51) hours. Analyses confirmed that a rise in acute MCT greater than that defined by the equation had a sensitivity, specificity, positive predictive value (PPV) and negative (N) PV of 78%, 91%, 98% and 44%, respectively. The magnitude of increase in acute MCT above the threshold predicted by consensus equation was higher in the anaphylaxis group compared to controls (P=.0001). This equation has a high specificity, PPV with a moderate NPV and sensitivity in perioperative anaphylaxis.

Lymphogranuloma venereum presenting as genital ulceration and inguinal syndrome in men who have sex with men in London, UK.

OBJECTIVES: To describe a series of lymphogranuloma venereum (LGV) cases presenting as inguinal syndrome and/or genital ulceration seen among men who have sex with men (MSM) in London, UK. METHODS: Collaborative retrospective case note review. Clinicians from three London genitourinary medicine (GUM) clinics accessed by large populations of MSM within the current LGV outbreak collected clinical data from confirmed cases of LGV inguinal syndrome or genital ulcer. LGV was confirmed by the detection of LGV-specific DNA from specimens such as bubo aspirates, ulcer swabs, urethral swabs, first void urine and rectal biopsy material. RESULTS: There were 13 cases detected overall: 5 cases of urethral LGV infection with inguinal adenopathy, 3 cases of genital ulcer with LGV inguinal adenopathy, 3 cases of isolated LGV-associated inguinal buboes, 1 case of a solitary LGV penile ulcer and 1 case with a penile ulcer and bubonulus. Only 6 of the 13 were HIV positive and all tested negative for hepatitis C. The majority of cases reported few sexual contacts in the 3 months preceding their diagnosis. CONCLUSIONS: Clinical manifestations of LGV in MSM have not been confined to proctitis in the current outbreak in the UK and a small but significant number of inguinogenital cases of LGV have been observed. Epidemiologically, many of the cases described seem to have occurred at the periphery of the current MSM LGV epidemic. Clinicians need to be vigilant for these less common presentations of LGV among MSM and specific diagnostic tests should be done from the relevant lesions.

Syphilis causing hearing loss.

An HIV-positive man with hepatitis B co-infection, naïve to highly active antiretroviral therapy, with a CD4 of 594 copies/mL and HIV-1 viral load of 140,070 copies, presented with right-sided facial weakness and hearing loss. He had been treated for secondary syphilis three months earlier when his rapid plasma reagin (RPR) result was 1:16, this had fallen to neat. At presentation, his RPR had risen to 1:16 again. A magnetic resonance imaging scan showed enhancement of the internal auditory canal and right cochlea. His cerebrospinal fluid examination was normal. He was treated with acyclovir and prednisolone before the syphilis serology was known. He was then treated for syphilis with doxycycline. He made an excellent recovery.