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Biomedical subjects

M W Butler

Publications and source records attributed to M W Butler.

6 recordsLinked to original sources

Managing exacerbations of COPD: room for improvement.

Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) are a major cause of hospital admissions. Because of the consequent morbidity, mortality and burden on hospital resources, COPD management guidelines have been formulated. We reviewed 62 consecutive patients with AECOPD admitted from September 1st to December 18th 2000 in St. Vincents University Hospital, Ireland, including 3 months follow-up data, to evaluate the quality of care and in particular to assess the care of such patients by respiratory and non-respiratory physicians. There was a frequent failure to objectively confirm the diagnosis of COPD by spirometry (completed in 39 of the 51 patients who, at admission, had been previously labelled with COPD (76%), and in 53 out of 62 patients (85%) at the end of the study period), or to estimate severity by quantifying the FEV1 as a percentage of the normal predicted range (estimated in only 21 of the 39 patients who had spirometry previously performed (53%)). Those patients managed with input from respiratory physicians were more likely to have their diagnosis of COPD confirmed with spirometry (p < 0.05). They were also more likely to have out-patient follow-up arranged at discharge (p < 0.05). There was a trend towards the more frequent prescribing of oxygen to hypoxic patients in "respiratory" than in "non-respiratory" managed cases (p = 0.182) and a shorter hospital stay (0.1 < p < 0.5). 4 out of 11 severely hypoxaemic patients at admission (PO2 < 7.3kPa) were not screened at discharge for possible long term oxygen therapy (36%). 20 patients received combination antibiotic therapy with no infiltrate on CXR (32%). Pulmonary rehabilitation was offered to 12 patients (19%). 5 out of 18 current smokers had documented smoking cessation advice (28%) and none received smoking cessation pharmacotherapy. Finally we noted that the Hospital In-Patient Enquiry (HIPE) data and casualty department admission books were frequently misleading or medical records unlocatable (in 30 out of 92 cases (33%)). We conclude that the management of AECOPD at St. Vincent's University Hospital is frequently suboptimal, and may be managed better with respiratory physician involvement. In particular, there could be more frequent spirometric confirmation of the diagnosis of COPD, better screening for long term oxygen therapy and more conservative use of antibiotics. Audit is complicated by difficulty accessing relevant data.

Aged↗

Differential effects of inhaled nitric oxide on normoxic and hypoxic isolated in situ neonatal pig lungs perfused by extracorporeal membrane oxygenation.

Inhaled nitric oxide (NO) is effective as a selective pulmonary vasodilator, but its effects on uninjured lungs subjected to normoxia and hypoxia have not been fully studied. The authors sought the response of pulmonary vascular resistance (PVR) to inhaled NO in piglet lungs devoid of ischemic injury in a model of reversible pulmonary hypertension. If the changes were dose-responsive, the authors asked whether the PVR changes were related to normoxia or hypoxia, and hypothesized that the change would be more pronounced for hypoxia than normoxia. In situ isolated piglet lungs were prepared by occlusive tracheostomy and ligation of the ductus arteriosus and aorta. Cannulae positioned in the left atrium and pulmonary artery were connected to a standard extracorporeal membrane oxygenation (ECMO) circuit, and flow was increased to approximate cardiac output. After stabilization, piglets (aged 5 to 14 days, weighing 3.2 to 6.4 kg) were divided into two groups of four each: normoxic (FIO2 0.30, normal PVR) and hypoxic (FIO2 0.07, increased PVR). NO was administered at 10 to 80 parts per million (ppm) in increments of 10 ppm, for 5 minutes at each concentration, with a return to baseline before each new dose. Flow, pulmonary arterial (PA) and left atrial (LA) pressures were continuously monitored, from which PVR was calculated (PVR = [PPA - PLA]/flow) and expressed as log delta PVR. Data were analyzed statistically by repeated measures of analysis of variance, comparing log delta PVR to baseline at each dose of NO, and comparing log delta PVR for normoxic and hypoxic lungs at each dose of NO.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗

Contemporary management of congenital diaphragmatic hernia.

Despite advances in infant transport and intensive care, congenital diaphragmatic hernia (CDH) still poses a serious threat to life during the neonatal period. Only with the introduction of extracorporeal membrane oxygenation (ECMO) has mortality declined significantly. Understanding the pathophysiology of CDH and its devastating effect on the lungs' bronchial and vascular development assists the clinician in rational management during the perioperative period. Successful treatment demands prompt diagnosis, informed preoperative assessment and preparation, carefully timed surgical repair, and aggressive postoperative intensive care with a thorough understanding of the role of ECMO. Improvements in ventilatory support and pharmacologic management of pulmonary hypertension have allowed surgeons to delay repair until circulatory hemodynamics, electrolytes, and oxygenation can be optimized, even resorting to preoperative ECMO in selected cases if needed. Patients with severe bilateral pulmonary hypoplasia pose serious dilemmas in terms of selection for ECMO, as well as for surgical repair. Long-term follow-up of patients after CDH repair reveals persistent hypoperfusion of the involved lung but no debilitating pulmonary disease. Future therapies may include early fetal intervention or lung transplantation, although these areas remain controversial and experimental, and clinical experience is limited.

Female↗

Pulmonary cystic hydatid disease in Ireland.

BACKGROUND: Hydatid disease is rare in Ireland and its incidence and prevalence are unknown. Most cases are diagnosed by a combination of clinical findings, morphological features on imaging and by serological testing. AIMS: We describe an Irish case of pulmonary hydatid disease detected at bronchoscopy by bronchoalveolar lavage, and discuss the diagnosis and treatment of the disorder. CONCLUSION: The diagnosis of this rare disease requires a high index of suspicion. Treatment is primarily surgical, with a role for antihelminthic agents.

Adult↗

Quinolone-associated tendonitis: a potential problem in COPD?

BACKGROUND: Quinolones have traditionally had limited application in the area of community-acquired respiratory tract infections due to poor cover against Streptococcus pneumoniae. This trend is changing with the broader spectrum of newer fluoroquinolones. A rare serious side effect of fluoroquinolones is tendinopathy. AIMS: This study describes two cases of levofloxacin-associated tendinopathy in patients with severe chronic obstructive pulmonary disease (COPD) and the implications and mechanisms involved are discussed. CONCLUSIONS: The finding of two cases of levofloxacin-induced tendinopathy in our patients suggests that the problem may be more frequent than previously considered. Patients with COPD treated with fluoroquinolones may have other risk factors for tendinopathy such as advanced age, corticosteroid use and renal impairment and merit vigilance for signs of tendonitis.

Achilles Tendon↗

Dissatisfaction with Do Not Attempt Resuscitation Orders: A nationwide study of Irish consultant physician practices.

The legal/ethical status of Do Not Attempt Resuscitation (DNAR) orders in Ireland has not been clarified, nor have national policies been formulated. We questioned 298 consultant physicians in the Republic of Ireland about DNAR orders. 173 replies were received (58%). 85 expressed unsatisfactory understanding of issues relating to Irish DNAR orders (49%). 116 physicians felt that alert patients preferred not to discuss their own resuscitation (67%). 55 physicians felt that if a competent adult patient is the subject of a DNAR order without the patient's knowledge, the reasons for this decision are "almost never" documented in the patient's medical record (32%). 75 consultants "almost never" had advance discussion of resuscitation preferences with the patient (43%). 47 physicians had experienced advance directives for Irish patients (27%). 102 physicians felt that both they and the patient's next of kin had joint responsibility for deciding resuscitation status for an incapacitated patient with no advance directive (59%). 37 respondents described a formal resuscitation policy in their place of work (21%). We feel that physicians require greater national guidance regarding DNAR order-making, and we advocate more widespread use of resuscitation policies.

Advance Directives↗