The Role of the Allergist in Coronavirus Disease 2019 Vaccine Allergy Safety: A Pilot Study on a "Hub-and-Spoke" Model for Population-Wide Allergy Service.

BACKGROUND: Hong Kong started its coronavirus disease 2019 (COVID-19) vaccination program in February 2021. A territory-wide Vaccine Allergy Safety (VAS) clinic was set up to assess individuals deemed at "higher risk" of COVID-19 vaccine-associated allergies. A novel "hub-and-spoke" model was piloted to tackle the overwhelming demand of services by allowing nonallergists to conduct assessment. OBJECTIVE: To evaluate the outcomes of the VAS hub-and-spoke model for allergy assessment. METHODS: Records of patients attending the VAS hub-and-spoke Clinics between March and August 2021 were reviewed (n = 2725). We studied the overall results between the Hub (allergist led) and Spoke (nonallergist led) Clinics. The Hub and the Hong Kong West Cluster Spoke Clinic were selected for subgroup analysis as they saw the largest number of patients (n = 1411). RESULTS: A total of 2725 patients were assessed under the VAS hub-and-spoke model. Overall, 2324 patients (85.3%) were recommended to proceed with vaccination. Allergists recommended significantly more patients for vaccination than nonallergists (odds ratio = 21.58; P < .001). Subgroup analysis revealed that 881 of 1055 (83.5%) patients received their first dose of COVID-19 vaccination safely after assessment. Among those recommended vaccination, more patients assessed by allergists received their first dose of vaccination (odds ratio = 4.18; P < .001). CONCLUSION: The hub-and-spoke model has proven to be successful for the vaccination campaign. This study has illustrated the crucial role of allergists in countering vaccine hesitancy. Results from the study revealed considerable differences in outcomes between allergist-led and nonallergist-led clinics. Precise reasons for these differences warrant further evaluation. We are hopeful that the hub-and-spoke model can be similarly adapted for other allergist-integrative services in the future.

Fluoroquinolone-induced Achilles tendinitis.

We report a case of Achilles tendinitis after intake of ciprofloxacin for treatment of respiratory tract infection. Fluoroquinolone-induced tendinopathy is an uncommon but increasingly recognised adverse effect of this antibiotic class. Most of the cases occur in the Achilles tendon and may lead to tendon rupture. Possible predisposing risk factors include use of steroid, patients with renal impairment or renal transplant, old age, and being an athlete. The drug should be stopped once this condition is suspected. Symptomatic treatment should be given and orthopaedic referral is desirable if tendon rupture occurs.

Ultrasonographic Evaluation of Salivary Glands for Sjogren's Syndrome: Diagnostic and Monitoring Insights.

Sjogren's syndrome (SS) is a chronic autoimmune condition commonly affecting the exocrine glands, causing oral or ocular dryness and extraglandular manifestations including arthralgia, cytopenia, and lymphoma. The presence of autoantibodies against SSA/Ro, labial salivary gland biopsy, ocular staining, Schirmer's test, or salivary flow assessment are included in the current classification criteria of SS. However, the availability and invasiveness of these procedures limit their widespread use in clinical settings. Salivary gland ultrasonography (SGUS) is a non-invasive imaging modality for the evaluation of the salivary gland parenchyma and is increasingly utilized to aid diagnosis and monitoring in SS. This article presents the protocol of SGUS for image acquisition at the parotid and submandibular glands. The objective is to present a standardized, reproducible, and practical approach to diagnostic SGUS for SS in daily clinical settings. Major salivary glands are scanned in a stepwise approach, beginning at the angle of the mandible for the superficial lobe of the parotid gland, followed by the deep lobe below the ramus of the mandible. Submandibular areas are then scanned for the submandibular glands. The steps in obtaining salivary gland images at each anatomical site are explained in the accompanying video. The echogenicity and echotexture at the thyroid gland are taken as a reference. The homogeneity, the presence and distribution of hypoechoic areas within the glands, and the border of the salivary glands are examined. The sizes and features of intra-/peri-glandular lymph nodes are recorded. The most distinctive sonographic feature in SS is glandular heterogeneity with the presence of hypoechoic/hyperechoic areas within the glands. In summary, while SGUS cannot diagnose SS on its own, it can supplement the current classification criteria of SS and guide the clinical decision for salivary gland biopsy to support the diagnosis of SS in patients with sicca syndrome or suspicious systemic features, combined with autoantibody testing.

Comparative Effectiveness, Safety, and Real-World Outcomes of a Nurse-Led, Protocol-Driven Penicillin Allergy Evaluation From the Hong Kong Drug Allergy Delabelling Initiative (HK-DADI).

BACKGROUND: There is a high prevalence of unconfirmed penicillin allergy, which is associated with a multitude of adverse clinical outcomes. With the overwhelming burden of currently incorrect labels and the lack of allergy specialist services, new delabeling strategies are urgently needed. OBJECTIVE: To assess the effectiveness, safety, and real-world outcomes of a nurse-led, protocol-driven evaluation of penicillin allergy, the Hong Kong Drug Allergy Delabelling Initiative (HK-DADI). METHODS: Adult patients with suspected penicillin allergy were recruited into HK-DADI. Allergy and postdelabeling outcomes were retrospectively compared between patients evaluated via HK-DADI or traditional allergist evaluation. RESULTS: A total of 312 completed penicillin allergy evaluation: 84 (27%) and 228 (73%) via HK-DADI and traditional pathways, respectively. Overall, 280 penicillin allergies were delabeled (90%). The delabeling rate between HK-DADI and traditional pathways was similar (90% vs 89%; P = .796). Among patients of the HK-DADI pathway, the delabeling rate was significantly higher among low-risk (LR) compared with non-LR patients (97% vs 77%; P = .010). Skin tests did not add diagnostic value among LR patients. No patients developed severe or systemic reactions during the evaluation. Upon 6- to 12-month follow-up (median, 10 months), 123 patients experienced infective episodes (44%) and 63 used penicillins again after delabeling (23%). This proportion was significantly higher in patients who were delabeled via HK-DADI compared with the traditional pathway (32% vs 19%; P = .026). CONCLUSIONS: The Hong Kong Drug Allergy Delabelling Initiative, a nurse-led, protocol-driven evaluation, was safe and effective in penicillin allergy delabeling. It led to an even higher rate of future penicillin use after delabeling and mitigated the need for unnecessary skin testing among LR patients.

Risk and Factors associated with disease manifestations in systemic lupus erythematosus - lupus nephritis (RIFLE-LN): a ten-year risk prediction strategy derived from a cohort of 1652 patients.

Objectives: Lupus nephritis (LN) remains one of the most severe manifestations in patients with systemic lupus erythematosus (SLE). Onset and overall LN risk among SLE patients remains considerably difficult to predict. Utilizing a territory-wide longitudinal cohort of over 10 years serial follow-up data, we developed and validated a risk stratification strategy to predict LN risk among Chinese SLE patients - Risk and Factors associated with disease manifestations in systemic Lupus Erythematosus - Lupus Nephritis (RIFLE-LN). Methods: Demographic and longitudinal data including autoantibody profiles, clinical manifestations, major organ involvement, LN biopsy results and outcomes were documented. Association analysis was performed to identify factors associated with LN. Regression modelling was used to develop a prediction model for 10-year risk of LN and thereafter validated. Results: A total of 1652 patients were recruited: 1382 patients were assigned for training and validation of the RIFLE-LN model; while 270 were assigned for testing. The median follow-up duration was 21 years. In the training and validation cohort, 845 (61%) of SLE patients developed LN. Cox regression and log rank test showed significant positive association between male sex, age of SLE onset and anti-dsDNA positivity. These factors were thereafter used to develop RIFLE-LN. The algorithm was tested in 270 independent patients and showed good performance (AUC = 0·70). Conclusion: By using male sex, anti-dsDNA positivity, age of SLE onset and SLE duration; RIFLE-LN can predict LN among Chinese SLE patients with good performance. We advocate its potential utility in guiding clinical management and disease monitoring. Further validation studies in independent cohorts are required.

Nurse-Led Consultation for Patients With Rheumatoid Arthritis at Low Disease Activity: A Randomized Noninferiority Trial.

OBJECTIVE: To determine the effectiveness of nurse-led consultations in patients with stable rheumatoid arthritis (RA) in Hong Kong. METHODS: The present work was a single-center, randomized, open-label, noninferiority trial. Patients who had rheumatoid arthritis (RA) with low disease activity (LDA) were randomized at a 1:1 ratio to attend a nurse-led consultation or rheumatologist follow-up visit for 2 years. The primary end point was the proportion of patients whose RA remained at LDA. Secondary end points included the proportion of patients with RA in disease remission and the scores recorded on the Leeds Satisfaction Questionnaire at 2 years, changes from baseline on the Disease Activity Score in 28 joints using the C-reactive protein level (DAS28-CRP), modified Sharp/van der Heijde score (SHS), Health Assessment Questionnaire disability index (HAQ DI), Short Form 36 (SF-36) physical component score, and 19-item Compliance Questionnaire for Rheumatology (CQR-19) score. RESULTS: Among 280 patients who were randomized equally to either attend nurse-led consultations or rheumatologist follow-up visits, 267 patients completed the study. In the nurse-led consultation and rheumatologist follow-up groups, 92.1% and 91.4% patients, respectively, remained at LDA at 2 years. The 95% confidence intervals (95% CIs) of the adjusted treatment difference were within the predefined noninferiority margin in both the intention-to-treat analysis (95% CI 5.75, 7.15) and the per-protocol analysis (95% CI 1.67, 7.47). Although the changes in DAS28-CRP score over 2 years were significantly different between the 2 treatment groups (P < 0.001), there were no significant changes from baseline in SHS, HAQ DI, SF-36 physical component scores, and CQR-19 scores. At the end of the study, more patients expressed satisfaction with nurse-led consultations. CONCLUSION: Nurse-led consultations were not inferior to rheumatologist follow-up visits in patients with stable RA.

Implantation of a breathing pacemaker in a tetraplegic patient in Hong Kong.

A 38-year-old man had been tetraplegic and ventilator-dependent after sustaining a traumatic cervical spine fracture at the C1/C2 level in 1991, at the age of 22 years. He had been bedbound and mechanically ventilated since then. A multidisciplinary management team approached him in 2003 and helped him to become ambulatory and independent in his daily activities of living. We successfully implanted the diaphragm pacing stimulation system in this patient in 2004. Diaphragm pacing by phrenic nerve stimulation is well accepted in western countries, and has been in clinical application for children and adults for decades. Its use facilitates ambulation and improves the quality of life of tetraplegic individuals with chronic ventilatory failure.