Blood, Sweat, and Tonsils: Bleeding After Abscess Tonsillectomy for Quinsy-A Meta-Analysis.

OBJECTIVE: Abscess tonsillectomy is performed during an active episode of quinsy. Apprehensions regarding an elevated bleeding risk have hindered its widespread acceptance. This study aims to assess the prevalence of post-tonsillectomy bleeding (PTB) associated with abscess tonsillectomy. DATA SOURCES: A search was performed on August 27, 2023 in Medline, Embase, PubMed, Cochrane CENTRAL, and Web of Science databases. REVIEW METHODS: The systematic review was conducted in adherence to the PRISMA guidelines. Pooled PTB rate was determined using a meta-analysis of proportions. The JBI tool was used to assess the quality of the included studies. RESULTS: Of the 525 search records, 18 studies met the eligibility criteria for final analysis. These comprised of retrospective single-center analyses. The pooled prevalence of PTB was 6.65% (95% C.I. 4.01-9.81), and the return-to-theatre rate was 2.35% (95% C.I. 1.48-3.37). There was no difference in PTB rate between unilateral and bilateral tonsillectomy. However, the bipolar technique was associated with a higher PTB rate compared to cold steel dissection. The overall quality of the body of evidence was moderate. CONCLUSION: Our study highlights the complications associated with abscess tonsillectomy. These findings contribute valuable insights into this potential treatment option for quinsy. LEVEL OF EVIDENCE: N/A Laryngoscope, 2024.

A novel remote assessment pathway to streamline the management of two-week-wait suspected head and neck cancer referrals: a prospective analysis of 660 patients.

OBJECTIVE: This study analyses outcomes for 660 patients managed via a novel telescopic pathway for suspected head and neck cancer referrals. METHOD: Data were collected prospectively between January 2021 and December 2022, capturing all two-week-wait referrals triaged as low risk and managed via a nurse-led clinic for nasendoscopic examination and consultant-led remote assessment. RESULTS: In total, 660 patients were included. There were six head and neck cancers diagnosed, giving a conversion rate of 0.9 per cent. Mean (standard deviation) time to informing the patient whether they did or did not have cancer (28-day faster diagnosis standard) was 28.6 days (20.2), with no significant difference observed in patients imaged prior to review (p = 0.63). No missed cancers were detected in the follow-up period. CONCLUSION: Low-risk head and neck cancer referrals can be safely managed in a nurse-led clinic for recorded examination with asynchronous consultant-led management. Further work is required to ensure adherence to the new faster diagnosis standard.

A retrospective cohort study of telephone versus face-to-face clinics for the management of new otology referrals.

PURPOSE: To compare outcomes of telephone and face-to-face consultations for new otology referrals and discuss the wider use of telemedicine in otology. METHODS: Retrospective cohort study including new adult otology referrals to our unit, sampled consecutively between March 2021 and May 2021, seen in either a face-to-face or telephone clinic. Primary outcome measure was the proportion of patients with a definitive management outcome (discharged or added to waiting list for treatment) versus the proportion of patients requiring follow-up for further assessment or review. RESULTS: 150 new patients referred for a routine otology consultation (75 telephone, 75 face-to-face) were included. 53/75 patients (71%) undergoing a face-to-face consultation received a definitive outcome following initial review, versus 22/75 (29%) telephone patients (χ2 < 0.001, OR 5.8). 52/75 (69%) telephone patients were followed up face-to-face for examination. The mean (SD) number of appointments required to reach a definitive outcome was 1.22 (0.58) and 1.75 (0.73) in the face-to-face and telephone cohorts, respectively (p < 0.001). CONCLUSIONS: Telephone clinics in otology have played an important role as part of the COVID19 response. However, they are currently limited by a lack of clinical examination and audiometry. Remote assessment pathways in otology that incorporate asynchronous review of recorded examinations alongside audiometry, either conventional or boothless, may mitigate this problem; however, further research is required.

Patient perceptions of a remote assessment pathway in otology: a qualitative descriptive analysis.

PURPOSE: This study aims to gain in-depth feedback on patient perceptions of remote assessment in otology, to better inform the development of a telemedicine pathway for new otology referrals. METHODS: A qualitative descriptive approach was employed to analyse semi-structured interviews from 14 patients seen in a routine otology clinic. RESULTS: Patients were generally accepting of the proposed telemedicine pathway. Key themes included maintaining quality of care, adequate training for facilitators, reducing waiting times, appropriate actioning of clinic outcomes and anxiety surrounding the use of technology. CONCLUSIONS: Our proposed telemedicine pathway for new otology referrals is acceptable to patients, provided there is no compromise in the standard of their care versus a traditional pathway. These results further our understanding of remote assessment in otology from the patient perspective and may help to inform the development of such pathways outside of our centre.

Anatomical and audiological considerations in branchiootorenal syndrome: A systematic review.

Objective: Establish anatomical considerations, audiological outcomes, and optimal management in patients with branchiootic/branchiootorenal syndrome (BO/BOR). Methods: Databases reviewed: Medline, Pubmed, Embase, Web of Science, Cochrane Collection, and ClinicalTrials.gov. Clinical or radiological studies of patients with BOR syndrome describing either the audiological profile or anatomical changes were included. Articles in which BOR syndrome was associated with other syndromes, and those that were focused only on general and genetic aspects of BOR syndrome were excluded. Articles were assessed using Oxford Centre for Evidence-Based Medicine (OCEBM) grading system and the Brazzelli risk of bias tool for nonrandomized studies. Results: Searches identified 379 articles. Of these, 64 studies met the inclusion criteria, reporting outcomes in 482 patients from at least 95 families. In 308 patients, hearing loss was categorized as sensorineural (29%), conductive (20%), and mixed (51%). Hearing outcomes were variable in terms of onset, pattern, and severity; ranging from mild to profound deafness. One hundred sixty-nine patients presented with inner ear anomalies, 145 had middle, and 151 had external ear abnormalities. In 44 studies, 58 ear operations were described. Mixed outcomes were reported in patients managed with hearing aids or middle ear surgery; however, successful cochlear implantation was described in all five cases. Conclusion: The anatomical and audiological profiles of patients with BO/BOR are variable. A range of surgical procedures were described, however lacked objective outcome measures. Given the range of anatomical variants, management decisions should be made on an individual basis including full audiological and radiological assessment. Level of evidence: NA.

Introduction of a novel telescopic pathway to streamline 2-week-wait suspected head and neck cancer referrals and improve efficiency: A prospective service evaluation.

OBJECTIVES: This study summarizes the introduction of a novel telescopic pathway, which streamlines 2-week-wait suspected head and neck cancer referrals to our unit, describes the logistics of the pathway, and analyzes referral numbers and outcomes. We also discuss wider issues surrounding remote assessment in head and neck cancer. METHODS: Data were collected prospectively between January and May 2021, capturing all 2-week-wait referrals to our unit following the introduction of a telescopic pathway which utilized a nurse-led clinic for nasendoscopic examination of selected patients and consultant-led remote assessment using store and forward technology. Information on referral numbers, waiting times and outcomes was recorded. RESULTS: Three hundred and forty (185 high risk, 155 low risk) patients entered the telescopic pathway with the remaining 74 patients seen on the conventional standard of care pathway. Cancer conversion rates were 17%, <1%, and 5.4% for the high-risk telescopic, low-risk telescopic and standard of care pathways respectively. No patients discharged from the telescopic pathway were re-referred within 3 months. Review capacity for endoscopic examination was higher per consultant on the telescopic pathway versus the standard of care (p = .01). CONCLUSION: A combination of risk stratification and asynchronous telescopic assessment shows promise for the management of suspected head and neck cancer referrals. Potential benefits include consultant-led care for all patients and enhanced documentation. Digital communication with patients may also assist with adherence to the new NHS 28-day diagnostic standard for cancer referrals. Ongoing data collection is required to assess how the pathway functions over a longer period. LEVEL OF EVIDENCE: 2c.

Chordomas and chondrosarcomas of the skull base: treatment and outcome analysis in a consecutive case series of 24 patients.

BACKGROUND: We present our 9-year consecutive case series of skull base chordomas and chondrosarcomas from a UK tertiary referral centre, discussing treatments offered and outcomes. This was carried out to improve understanding around current treatment and to better inform the management of future patients. METHODS: Consecutive case series over a 9-year period (2007-2016). Retrospective data analysis from the electronic skull base multidisciplinary team database and the digital patient records at a UK tertiary referral centre RESULTS: Twenty-four patients were identified (11 chordomas, 13 chondrosarcomas, mean age 52). Nineteen had proton beam therapy (PBT) postoperatively; two had intensity-modulated radiotherapy; two had no further treatment. One patient was lost to follow-up. All chordomas were resected via a transnasal endoscopic approach. Of the 19 patients undergoing resection with PBT, 13 were disease free at latest follow-up, and six patients had local recurrence, of which two died (mean follow up 7.4 years). Of the three patients treated with surgery then IMRT/TomoTherapy, one died 4 years post-treatment, and the other two are alive after 4 and 5 years of follow-up respectively. Of the two patients treated with surgery alone, one was lost to follow-up, and the other is alive after more than 8 years. Chondrosarcoma 5-year survival was 91.6%, and chordoma 4-year survival was 75%. CONCLUSION: Skull base chordomas and chondrosarcomas can be challenging to resect, and most cases require adjuvant therapy to achieve control. Where complete resection is not possible, it is critical to undertake sufficient resection to permit high-dose radiation.

A systematic review of remote otological assessment using video-otoscopy over the past 10 years: reliability and applications.

PURPOSE: This systematic review describes and evaluates the current literature on remote otological assessment using video-otoscopy with regards to reliability and potential applications. METHODS: Systematic review was conducted in accordance with the PRISMA statement. There was heterogeneity of included studies, so a descriptive analysis was undertaken. RESULTS: Seventeen studies were included for analysis conducted across a variety of healthcare settings. Overall, there was a trend towards acquisition of adequate images for diagnosis by non-otolaryngology-specialist facilitators with reasonable agreement between asynchronous images and controls; however, there was significant variation between the studies. CONCLUSION: Remote otological assessment using video-otoscopy shows potential as a safe and effective method for detecting the presence of ear disease in a wide range of healthcare settings. Barriers to the acquisition of adequate images include the presence of obstructing cerumen, and strategies to deal with this should be considered. Further work is required to evaluate endoscope-based systems to assess whether they will allow the acquisition of higher quality images.

Continuity of care as a predictor of ongoing frequent attendance in primary care: a retrospective cohort study.

BACKGROUND: Frequent attenders (FAs) in primary care receive considerable resources with uncertain benefit. Only some FAs attend persistently. Modestly successful models have been built to predict persistent attendance. Nevertheless, an association between relational continuity of care and persistent frequent attendance remains unclear, and could be important considering both the UK government and Royal College of General Practitioner's (RCGP) aim of improving continuity. AIM: To identify predictive measures (including continuity) for persistent frequent attendance that may be modified in future interventions. DESIGN & SETTING: This is a retrospective cohort study sampling 35 926 adult patients registered in seven Bristol practices. METHOD: The top 3% (1227) of patients by frequency of GP consultations over 6 months were classed as FAs. Individual relational continuity was measured over the same period using the Usual Provider Continuity (UPC) index. Attendance change was calculated for the following 6 months. Multivariable logistic regression analysis was used to determine variables that predicted attendance change. RESULTS: FAs were on average 8.41 years older (difference 95% confidence interval [CI] = 7.33 to 9.50, P<0.001) and more likely to be female (65.36% versus 57.88%) than non-FAs. In total, 79.30% of FAs decreased attendance over the subsequent 6 months. No association was found between continuity and subsequent attendance. Increasing age was associated with maintained frequent attendance. CONCLUSION: Continuity does not predict change in frequent attendance. In addition to improving continuity, recent government policy is focused on increasing primary care access. If both aims are achieved it will be interesting to observe any effect on frequent attendance.

Introduction of a referral pathway guide for general dental practitioners in Cheshire & Merseyside: the effect on two-week suspected cancer referrals.

Introduction In 2017, Cheshire and Merseyside Local Dental Network introduced an Oral Cancer Care Guide for dental teams, emphasising the importance of early detection, appropriate referral, and effective patient communication. This study looks at the effect on two-week-wait (TWW) referrals to one unit, following the introduction of the guide and regional educational intervention.Methods Somerset Cancer Register, provided data from two three-month cohorts of TWW suspected head and neck cancer referrals, before and after introduction of the guide.Results There were 390 and 481 referrals respectively during the two three-month time-periods. The number of general dental practitioner (GDP) referrals rose from 24 to 59 (6.2% to 12.3%, P = 0.002) following introduction of the guide. The cancer conversion rate remained the same for general practitioner (GP) referrals (6.3% and 6.2%) but was lower for GDP referrals (21% vs 12%, P = 0.31).Conclusions We observed an increase in referrals following the introduction of the guide; however, the conversion rate for GDP referrals reduced. Education and ease of referral are essential for reducing the number of advanced cancers presenting to secondary care, but more research is required to inform an improvement in specificity. Future work is required looking at the long-term impact of the guide including adaption for local GP usage.

The Liverpool Peritonsillar abscess Score: Development of a predictive score through a prospective multicentre observational study.

OBJECTIVES: While uncommon in the population at large, peritonsillar abscess (PTA) is a common subject of ENT referrals. Missed or uncertain diagnosis is a source of concern for non-specialist referrers. In line with the NHS England Second Sepsis Action Plan, we aimed to develop a predictive score for the presence of PTA. This would help to improve non-specialist colleagues' diagnostic certainty as well as to support ENT surgeons' triage of these referrals. DESIGN: Prospective, multicentre observational study. SETTING: Primary and secondary care. PARTICIPANTS: Patients >16 years with symptoms of sore throat. DATA: We prospectively collected comprehensive data on patient demographics, symptoms and clinical status. We documented whether the patient had aspiration-proven PTA or not. We performed binary logistic regression analysis, iterative development of a predictive score which we validated internally. RESULTS: 100 patients were included (46 PTA and 54 tonsillitis). Five variables added significantly to the logistic regression model: unilateral sore throat; trismus; male gender; pharyngeal voice change; and uvular deviation. Using the odds ratio outputs, we developed the Liverpool Peritonsillar abscess Score (LPS) iteratively. We validated the latest (third) iteration of the LPS internally (ie, on the same sample), yielding sensitivity 96%; specificity 85%; positive predictive value 85%; and negative predictive value 96%. The area under the receiver operating characteristics (AUROC) curve was 0.970. CONCLUSIONS: We have developed the first predictive score for PTA based on symptoms and signs that do not require the user to have specialist experience. Its high negative predictive value may be particularly helpful to non-specialist colleagues.

Investigating the effects of lycopene and green tea on the metabolome of men at risk of prostate cancer: The ProDiet randomised controlled trial.

Lycopene and green tea consumption have been observationally associated with reduced prostate cancer risk, but the underlying mechanisms have not been fully elucidated. We investigated the effect of factorial randomisation to a 6-month lycopene and green tea dietary advice or supplementation intervention on 159 serum metabolite measures in 128 men with raised PSA levels (but prostate cancer-free), analysed by intention-to-treat. The causal effects of metabolites modified by the intervention on prostate cancer risk were then assessed by Mendelian randomisation, using summary statistics from 44,825 prostate cancer cases and 27,904 controls. The systemic effects of lycopene and green tea supplementation on serum metabolic profile were comparable to the effects of the respective dietary advice interventions (R2 = 0.65 and 0.76 for lycopene and green tea respectively). Metabolites which were altered in response to lycopene supplementation were acetate [ß (standard deviation difference vs. placebo): 0.69; 95% CI = 0.24, 1.15; p = 0.003], valine (ß: -0.62; -1.03, -0.02; p = 0.004), pyruvate (ß: -0.56; -0.95, -0.16; p = 0.006) and docosahexaenoic acid (ß: -0.50; -085, -0.14; p = 0.006). Valine and diacylglycerol were lower in the lycopene dietary advice group (ß: -0.65; -1.04, -0.26; p = 0.001 and ß: -0.59; -1.01, -0.18; p = 0.006). A genetically instrumented SD increase in pyruvate increased the odds of prostate cancer by 1.29 (1.03, 1.62; p = 0.027). An intervention to increase lycopene intake altered the serum metabolome of men at risk of prostate cancer. Lycopene lowered levels of pyruvate, which our Mendelian randomisation analysis suggests may be causally related to reduced prostate cancer risk.

Coblation tonsillectomy: a systematic review and descriptive analysis.

Coblation is one of the more recent techniques for tonsillectomy; however, it remains unclear whether it exhibits any benefit or increased risk when compared to other techniques. This review provides an updated assessment of coblation tonsillectomy and how it compares to other tonsillectomy techniques. Systematic review and descriptive analysis of published literature. Electronic searches of MEDLINE, EMBASE, Web of Science and the Cochrane Database were performed. We included all randomized control trials comparing coblation tonsillectomy (not 'tonsillotomy') with any other tonsillectomy technique. Studies were excluded if tonsils, rather than individuals, were randomized. 16 eligible studies were identified, including a total of 567 patients, both adults and children. Coblation was compared with a variety of other tonsillectomy techniques. Outcomes included pain, primary and secondary haemorrhage, intraoperative bleeding and operation time. Postoperative pain was the primary outcome in most studies. There was a trend towards less pain in the coblation group in seven of the included studies. More recent studies appeared to fare more favourably in terms of pain outcomes and operating time. The coblation technique appears to be comparable with other commonly employed techniques for tonsillectomy; however, there is still no strong evidence to suggest that it possesses any definitive benefits. Findings would advocate further work being done through carefully designed randomised control trials, which compare coblation with cold dissection as the 'gold standard' and place an emphasis on reducing the amount of adjuvant electrocautery used so as to maximise the benefits of coblation and the lower temperature it generates.

The impact of ear disease and hearing impairment on the lives of Nepali patients in Pokhara: a qualitative study.

BACKGROUND: Ear disease in Nepal is a common problem which, left untreated, can cause serious complications such as hearing impairment (HI). Evidence shows that HI is associated with educational difficulties, employment problems and social isolation. Currently, there is little qualitative literature investigating the long-term impact of ear disease, and none specifically reporting on Nepali populations. This qualitative study explored the experiences of individuals affected by ear disease, with a view to informing hospital services and educational programmes. METHODS: A quota sampling technique was used, with 21 face-to-face semi-structured interviews conducted in Pokhara, Nepal during February-March 2014. Interviews were audiotaped, and verbatim transcripts were analysed using a conventional content analysis approach. RESULTS: Three overarching themes were identified: stigma, non-disclosure and barriers as a result of HI, stigma and non-disclosure. Stigma was both experienced and feared by participants throughout their lives, and as a result, they would not disclose their problem to friends, teachers and employers. Participants faced barriers in their education and work but did not receive the support they required because people were unaware of their condition. CONCLUSIONS: This research suggests that a 'stigma cycle' has developed and that participants are being trapped within it. This impacts adversely upon individuals' personal, social and economic development, limiting the human capital available to Nepal.

Gleason drift in the NIHR ProtecT study.

AIMS: There is increasing evidence of Gleason score (GS) drift in prostatic core biopsies during the last two decades. The ProtecT study is a randomized controlled study and provides an excellent cohort to study the effect of time, prostate-specific antigen (PSA) level, perineural invasion, tumour length and age on GS. METHODS AND RESULTS: The ProtecT study recruited men in the United Kingdom between 1999 and 2010. The Gleason scores were grouped into four categories ≤ 3 + 3, 3 + 4, 4 + 3 and ≥ 4 + 4 for analysis. Data from England between 2000 and 2012 were also available. A total of 3282 biopsies containing cancer were analysed. For each year of the ProtecT study, the odds of being diagnosed with a higher GS category increased by 4.9%. Higher GS was also associated with perineural invasion, increasing tumour length, age and PSA level. While biopsy GS from England was incomplete, it also showed a marked decrease in GS five and six tumours during the same period. CONCLUSION: There was GS drift from 3 + 3 to 3 + 4 with time in the ProtecT study, but there appeared to be no significant change in percentage of GS 4 + 3 or higher. This drift was less dramatic when compared to GS in the rest of England.

Is a preoperative group and save necessary for enhanced recovery joint replacement patients?

AIM: To consider the financial benefit to the authors' trust of omitting a preoperative group and save in enhanced recovery arthroplasty patients, and to estimate the scope for national savings. Patient safety was considered to determine acceptability for routine practice. METHODS: A total of 121 patients receiving a total knee replacement or total hip replacement on the authors' enhanced recovery protocol were selected. Pre- and postoperative haemoglobin levels were obtained. The transfusion team were contacted when the postoperative haemoglobin level was ≤8 g/dl to determine whether blood products had been issued. Costs for group and save were obtained from the pathology department. RESULTS: Mean postoperative reduction in haemoglobin level was 2.6 g/dl (P≤0.001) and 2.1 g/dl (P≤0.001) for total hip replacement and total knee replacement respectively. No patients were transfused. One group and save costs £12.00, and omission of this test in these patients would have saved £1452.00. Potentially, £1 605 408 could have been saved in the 133 784 patients undergoing NHS arthroplasty in 2012. Group and save omission would not affect management of intraoperative haemorrhage where O negative blood would be available. If a transfusion is required postoperatively it would take 100 minutes to issue crossmatched blood - a time delay unlikely to compromise patient safety. CONCLUSIONS: These results suggest that a preoperative group and save could be omitted in arthroplasty patients on this enhanced recovery programme to prevent needless expenditure, but more long-term follow up is required to ensure patients are not put at risk.

What patients consider important: temporal variations by early and late stage oral, oropharyngeal and laryngeal subsites.

Functional outcomes are of high priority to cancer patients and are relevant when considering treatment strategies. This study aimed to collate and analyse importance rankings of UW-QOL over time for patients treated with curative intent for primary head and neck squamous cell carcinoma between 2000 and 2010, and to compare early and late stage oral, oropharyngeal and laryngeal subsites. There were 1614 patients comprising oral cavity 47% (751), oropharyngeal 24% (382), laryngeal 20% (320) and other HNC locations 10% (161). Items of importance remained relatively stable within clinical groups but there were notable differences between groups. For patients with early oral tumours no domain was especially dominant, whereas for late oral tumours swallowing, chewing, speech and saliva were selected more often. Swallowing and saliva were more important in oropharyngeal tumours, as was taste with more advanced oropharyngeal tumours. Speech and activity were important for those with early laryngeal tumours, as were swallowing and speech for more advanced laryngeal tumours. Swallowing and saliva were more important in advanced tumours for all sites. This data confirms the priority patients place on swallowing, chewing, speech, and saliva, therefore curative treatments should optimise these functions wherever possible and provide access to post-treatment interventions as required.

A controlled trial of personal construct psychotherapy for deliberate self-harm.

Evidence for the effectiveness of psychological therapies for people who self-harm is limited. Personal construct theory provides a model of self-harm and a framework for therapeutic intervention, which was evaluated in the present study. Sixty-four adults presenting to Accident and Emergency departments following self-harm were allocated to a personal construct psychotherapy or a 'normal clinical practice' condition. They completed various measures at assessment points pre- and post-therapy. Repetition of self-harm was assessed over a 3-year period. Participants in the intervention condition showed significantly greater reduction in suicidal ideation, hopelessness and depression post-treatment than the control group; and significantly more reconstruing at this point and 6-month follow-up. There was some evidence suggestive of a lower frequency of repetition of self-harm in the intervention than in the control group. It is concluded that brief personal construct psychotherapy may be effective for people who self-harm and merits further exploration.

Predicting response to rhDNase and hypertonic saline in children with cystic fibrosis.

Daily recombinant human deoxyribonuclease (rhDNase) is an established but expensive treatment in cystic fibrosis (CF). Alternate-day rhDNase and hypertonic saline (HS) represent potential cheaper alternative therapies. However, not all patients improve on treatment. To assess response, many CF centers have developed formal n-of-1 trials of treatment to find out who benefits. Response to daily rhDNase at 3 months has been shown to be a good predictor of response at 1 year. There are no data correlating individual response at a shorter time period with 3-month response. We assessed whether individual responses to daily rhDNase, alternate-day rhDNase, and HS could be predicted from lung function response at 6 weeks, thus shortening the n-of-1 trial, or from baseline patient characteristics, therefore avoiding the need for an n-of-1 trial. In a randomized crossover trial, 48 CF children were allocated consecutively to 12 weeks of once-daily 2.5-mg rhDNase, alternate-day 2.5-mg rhDNase, and twice-daily 5 ml of 7% HS. Forced expiratory volume in 1 sec (FEV1) and forced vital capacity (FVC) were measured at baseline and then at 6 and 12 weeks into each treatment period. Lung function response to the drugs at 6 weeks was highly predictive of response at 3 months. There was some evidence that response to HS was worse in patients with lower baseline lung function. However, there was no association between response to alternate-day or daily rhDNase and baseline characteristics. In conclusion, response to rhDNase and HS at 6 weeks was highly predictive of response at 3 months. For daily and alternate-day rhDNase, at least, the drug needs to be administered for at most 6 weeks initially to assess long-term response to treatment. Response to treatment could not be reliably predicted from baseline characteristics.