Volume 13

Over-diagnosis and other crises facing evidence-based medicine

Introduction

There is a crisis in ‘evidence-based medicine’ (EBM). Reviewers and meta-analysts have become aware that much of their work may be futile because some investigators only publish selected results that favour their own point of view. Such reviews can only be reliable if there is access to all the raw data or if everyone is compelled to publish ‘negative’ results too. This is proving difficult and controversial. The latest example is dabigatran, which was hailed as a safe advance that needs no coagulation monitoring. It seems that the reduced frequency of bleeding if there is coagulation monitoring was not reported. There is also widespread uncertainty about the thresholds for treatment. This has been highlighted in the ‘over-diagnosis campaign’ to address a concern that many patients are subjected to harm without much benefit. Many see the problem as one of vested interest e.g. where those who gain from supplying a treatment will tend to advocate a low threshold for treating whereas those who wish to reduce costs or effort prefer to set high thresholds. The evidence needs to support what is best for the patient and gathered by those who care for them e.g. acute medicine physicians.

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An avoidable cause of cardioembolic stroke

Abstract

Left Atrial Ablation for Atrial Fibrillation is safe and effective for most patients. However a rare complication is thermal damage to the integrity of the normal physical barriers between the left atrium and the adjacent oesophagus due to the ablation process. This can lead to formation of an Atrial-Oesophageal fistula with sepsis, haemorrhage and systemic cardioembolism occurring even up to 2 months post procedure. The presentation is similar to endocarditis but localised instrumentation specifically Transoesophageal echocardiography (TOE) can provoke systemic cardioembolism. This is an important differential in those presenting acutely with a Pyrexia of Unknown Origin or endocarditis-like picture within 2 months of ablation therapy.

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Two different presentations, one diagnosis

Abstract

Acute confusion and hyponatraemia are common presentations in acute medicine. We report two cases of anti-voltage gated potassium channel (VGKC) antibody-related limbic encephalitis highlighting the variable presentation of this condition. Both patients were thoroughly investigated with MRI scan of brain, lumbar puncture, EEG as well as infective and autoimmune screens for encephalitis. Anti-VGKC antibodies were positive for both patients and prompt treatment with immunotherapy yielded good recovery. Patients presenting with confusion and seizures who have no demonstrable infectious or metabolic cause should have investigation for an autoimmune cause expedited. In addition, psychiatric presentations with atypical features such as drowsiness should prompt similar investigations. The outcome of anti-VGKCrelated limbic encephalitis is improved with early treatment employing steroids or immunotherapy.

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Successful treatment of massive pulmonary embolism using a pulmonary artery catheter during prolonged normothermic cardiopulmonary resuscitation

Abstract

Massive pulmonary embolism has a high mortality rate. Standard treatment includes systemic thrombolysis. If this fails, surgical embolectomy or a percutaneous catheter-guided approach is advised in current guidelines. However, these treatment options might not be available in many non-tertiary care hospitals. We describe a case of a 25-year old woman with cardiac arrest from massive pulmonary embolism. She was treated with thrombus fragmentation using a pulmonary artery catheter and intra-pulmonary thrombolysis after failure of systemic thrombolysis along with 90 minutes of cardiopulmonary resuscitation (CPR). Neurological recovery was excellent and pulmonary pressure was normalized after one month. Besides catheter guided thrombus fragmentation and thrombolysis, we contribute the successful outcome to a combination of ultrasound-guided therapy, capnography-guided CPR, and “crew resource management” principles. Our case illustrates that a pulmonary artery catheter can be used successfully in a non-tertiary setting, to perform a percutaneous procedure during CPR and that full neurological recovery is possible after 90 minutes of CPR.

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Lumbar Punctures in the Acute Medicine Department: indications and evaluation of use

Abstract

Aims:
• Evaluate the use of lumbar puncture (LP) in the Acute Medical Department of a typical urban district general hospital.
• Increase the proportion performed on appropriate patients.

Methodology: An observational, single-centre, retrospective examination of patients undergoing LP at Solihull Hospital over four consecutive months. Discussion of findings and LP indications with the Acute Medicine Department. Re-audit over four months.

Results: Total LPs performed fell by 65%. The proportion performed on patients presenting with red flags rose by 19% (p=0.0098). The proportion that yielded positive findings rose by 33% (p<0.0001). 72% of patients with red flags had negative LP. Conclusions: Awareness of indications and observation of practice reduces total LPs performed and increases the proportion performed on appropriate patients.

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Improving recognition and management of acute kidney injury

Abstract

Acute kidney injury (AKI) is currently suboptimally recognised and managed in the UK, despite its association with significant patient morbidity, mortality and consequent implications for healthcare economics. Our prospective study, performed in a large urban London hospital, demonstrated that the introduction of a specially designed care bundle can significantly improve documentation of baseline creatinine, assessment and optimisation of fluid status, performance of urine dip, withholding of nephrotoxic drugs, appropriate monitoring of urine output, prescription of renal drug doses, and appropriate consideration of a renal ultrasound and urinary protein-creatinine ratio. Improved compliance of appropriate investigations and initial treatments translated to decreased requirement for intensive care admission and a trend towards shorter length of stays.

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How to follow the NEWS

Abstract

Background: it is not known how best to respond to changes in the National Early Warning Score (NEWS) after hospital admission. This report manipulates and extrapolates previously published data on the trajectories of the abbreviated early warning score (AbEWS i.e. NEWS that does not include mental status).

Methods: trajectories of averaged AbEWS for patients for their first 5 days in hospital and their last 5 days in hospital were combined to obtain an approximation of what happens to the average patient while in hospital.

Results: the trajectories of patients admitted with a low score are different from those admitted with a high score. Patients should be observed for 12 to 24 hours before their outcome can be predicted. The score of most patients who die in hospital trends upward on the second or third day after admission. Patients admitted with a score of 0-2 who raise their score to >=3 have a ten-fold increase in-hospital mortality.

Conclusions: the trajectories of early warning scores after admission are of prognostic importance, and escalation protocols should relate changes in the score to its initial value on admission.

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Editorial

Anyone who has ever submitted a case report to a journal will know how hard it can be to get this published. This journal regularly receives 2-3 times as many as we could ever include, so there is often a tough task in selecting those which the editorial team feel will most interest our readers. A rather unusual quandary recently arose when two cases of VGKC encephalitis arrived in the same week, submitted independently from different parts of the UK. The referees felt that both had merits, so I was very grateful when the authors agreed to co-operate to combine the cases into a single submission, highlighting the varied presentation of a rare, but increasingly recognised condition. Both might have remained undiagnosed, had the appropriate antibody test not been requested. An awareness of this unusual, but treatable form of encephalitis will hopefully ensure that it enters the differential diagnosis for patients whose non-specific neurological presentation remains undiagnosed after the standard investigations have been completed.

Vigilence for the unusual is also the theme of the case report from Declan O’Kane; here the diagnosis of aorto-oesophageal fistula (AOF) following ablation therapy for AF was not considered until after the patient suffered a stroke, apparently precipitated by trans-oesophageal echo (TOE). The authors stress the potential for delayed presentation of this condition, and the need to ensure that it can be eliminated from the differential before oesophageal instrumentation is carried out. The fact that AOF is a more common complication of ablation therapy than endocarditis requires that CT images are carefully reviewed, and repeated if necessary, before proceeding to TOE when patients present with unexplained and persistent pyrexia following this procedure.

The team from Delft in Holland describe their case as ‘remarkable’, highlighting the importance of perseverance in the management of patients whose cardiac arrest results from massive pulmonary embolism. The patient made a full recovery after 90 minutes of cardiopulmonary resuscitation, which was conducted alongside simultaneous intra-pulmonary thrombolysis in a district general hospital setting. The patient’s age and prior good health undoubtedly contributed to this good outcome, although enormous credit must be afforded to the skills and teamwork described in the report. She should certainly consider herself lucky, on many different levels.

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Picture Quiz Answer: A Life-Threatening Cause of Abdominal Pain

Case Outcome:

Following review of the abdominal x-ray, an urgent CT aortogram was undertaken which showed an abdominal aortic aneurysm (AAA) measuring 13 cm in width and 18.9 cm in length (Figure 2 and 3). Furthermore there was some stranding of tissue around the margins of the aorta superiorly consistent with an early leak of the aneurysm. Surgical repair of the giant AAA was carried out; however two days after operation the patient deteriorated suddenly and despite all attempts at resuscitation, he passed away.

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Problem based review: The patient presenting with hyponatraemia

Abstract

Hyponatraemia is the most common electrolyte anomaly and is associated with significant morbidity and mortality. Patients with severe hyponatraemia often present to acute medical units with non-specific symptoms which can progress to overt neurological manifestations. There are many causes of hyponatriaemia, the most common being drug-induced causes, particularly thiazide diuretics, and the Syndrome of Inappropriate ADH Secretion (SIADH). Initial assessment should include a careful evaluation of the patient’s volume status, which helps to identify the most likely cause. This article utilises a recent case which presented to our AMU to illustrate the importance of a careful and systematic assessment of patients presenting to hospital with hyponatraemia. The new vasopressin receptor antagonists are explored as an option for the management of severe hyponatraemia.

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