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Biomedical subjects

C F Weston

Publications and source records attributed to C F Weston.

At least 37 records · Page 2Linked to original sources

Acute myocardial infarction related to smoke inhalation and myocardial bridging.

A previously healthy 26 year old woman who was exposed to smoke during a house fire developed acute anterior myocardial infarction complicated by ventricular fibrillation. Subsequent left ventriculography confirmed anterior infarction, but coronary arteriography was normal apart from myocardial bridging over a segment of the left anterior descending artery. The development of acute myocardial infarction in this patient suggests that, in the presence of bridging, carbon monoxide inhalation may cause regional infarction.

Adult↗

Audit of an emergency ambulance service: impact of a paramedic system.

The purpose of this survey was to assess the workload of an emergency ambulance service, to describe the use of paramedic skills by those staff with full extended training, and to predict the impact upon the provision of pre-hospital care of deploying a paramedic on every emergency ambulance. Accordingly, a week-long survey was undertaken of all urgent and emergency calls received by an ambulance service covering a mixed urban and semi-rural area of 187 square miles with a population of 396,000. Of the total 682 emergency calls 351 (51.5%) originated from the '999' system: 291 of these patients were taken to hospital where 51% were thought to have minor conditions and 141 were admitted. General practitioners made 236 (34.6%) emergency calls: 234 patients were taken to hospital where 76.4% were thought to have potentially serious conditions or an acute risk to life and 217 were admitted. There was no difference in the type or severity of conditions attended by paramedic or non-paramedic crews. Time spent on-scene was significantly longer when paramedics were present (mean 11.0 min, 95% confidence interval 9.54-12.46 min v 8.31 min, 7.49-9.13 min) (p less than 0.01). Extended skills were used by paramedics in 42 (23.6%) of their patients, most of whom were medical cases. One patient was resuscitated from cardiac arrest. The presence of a paramedic on every emergency ambulance increases the time spent on-scene and offers advanced pre-hospital skills to patients who need them. Care should be taken to ensure that the benefits of time spent on-scene using such skills outweigh the disadvantage of delayed hospital admission.

Allied Health Personnel↗

The Graham Steell murmur: eponymous serendipity?

On 7 March 1888 Dr Graham Steell addressed the Manchester Medical Society in the premises of the Literary and Philosophical Society in George Street, Manchester. He chose as his subject 'The auscultatory signs of mitral obstruction and regurgitation', and later that year published two papers on the same theme in the Manchester Medical Chronicle. In one he wrote: 'I wish to plead for the admission among the recognised auscultatory signs of disease of a murmur due to pulmonary regurgitation, such regurgitation occurring independently of disease or deformity of the valves, and as the result of long-continued excess of blood pressure in the pulmonary artery'. His observations were later confirmed by pathological correlation, and more cases were reported, notably by Paul White. The early diastolic murmur of pulmonary incompetence caused by pulmonary hypertension is now associated eponymously with Dr Graham Steell. We review the life and work of this physician and conclude that the original source of the observation, subsequently validated by modern techniques, was probably George Balfour of Edinburgh, and that Graham Steell was fortunate to have this physical sign attributed to him.

England↗

Late postoperative cardiac tamponade presenting as dysphagia.

A case of late cardiac tamponade seen with progressive dysphagia 15 days after aortic valve replacement is reported. The diagnosis was confirmed echocardiographically and successful pericardiocentesis was followed by immediate alleviation of the dysphagia.

Aortic Valve↗

Acute upper gastrointestinal haemorrhage in patients aged 80 years or more.

We report a series of 103 admissions of patients aged 80 years or more with acute upper gastrointestinal haemorrhage to one hospital over a four-year period. A cause was eventually found during 81.5 per cent of admissions and of these, 57 per cent had bled from chronic peptic ulcers. After 64 per cent of admissions, the patient received a blood transfusion and in 25 per cent, the blood transfusion exceeded 5 units. Nine patients had surgery for peptic ulcer during admission but no operations were performed in patients with other causes of upper gastrointestinal haemorrhage. Patients with peptic ulcer, when compared to patients with other causes for haemorrhage, were more likely to have symptoms of upper gastrointestinal disease before presentation. They were also more likely to continue to bleed, to bleed again, to require surgery, and to die as a consequence of haemorrhage. Eighteen admissions (17.5 per cent) ended with death but in only 11 (10.5 per cent) did the patient die directly because of haemorrhage. Nine of these bled from a peptic ulcer, one from oesophageal varices and one from an unknown cause. Patients who died from haemorrhage, when compared to all others, were more likely to have bled from a peptic ulcer and to have significant co-existing disease, to have ingested non-steroidal antiinflammatory drugs or aspirin before admission, to have raised blood urea level and low systolic blood pressure at admission and to have required blood transfusion of more than 5 units. Our study has shown that upper gastrointestinal haemorrhage secondary to peptic ulceration is a serious and often fatal condition in the elderly. Identification and effective monitoring of those at particular risk of death may be essential if mortality is to be reduced.

Acute Disease↗

Xanthomas in the Watson-Alagille syndrome.

The Watson-Alagille syndrome is a distinctive type of congenital cholestasis, in which hepatic ductular hypoplasia is associated with various ocular, bony, and cardiac anomalies, often with a characteristic facies. The prognosis is surprisingly good, and we present a 26-year-old woman with this syndrome in whom intense pruritus and xanthomatosis had been prominent during infancy but had subsequently cleared completely. The recognition of this syndrome in a young child with cholestatic jaundice may obviate the need for a diagnostic laparotomy.

Abnormalities, Multiple↗

Haemodynamic changes in man during immersion in water at different temperatures.

1. Stroke volume and cardiac output were measured using the Doppler ultrasound technique in 16 normal subjects immersed to the neck in water at 33 degrees C, 35 degrees C, 37 degrees C and 39 degrees C. A standard aortic diameter was assumed and results were expressed as percentage changes from pre-immersion resting values. 2. Cardiac output rose progressively at higher temperatures, increasing by 30% at 33 degrees C and by 121% at 39 degrees C. At thermoneutral temperatures (33 degrees C and 35 degrees C) this was achieved by an increase in stroke volume of 50% despite a significant decrease in heart rate. There was a further rise in stroke volume and pulse rate at higher temperatures and a mean tachycardia of 109 +/- 4 beats/min was noted at 39 degrees C. Calculated peripheral resistance reduced progressively with increasing temperature of immersion. 3. This non-invasive and simple technique may provide a non-exercise-related cardiovascular stress test to study cardiovascular responses in a variety of pathophysiological states.

Adult↗

Pancytopenia and folate deficiency in alcoholics.

Three alcoholic patients are reported who presented with pancytopenia and macrocytosis due to acute folate deficiency. While folate deficiency is a common finding in alcohol abusers due to abnormalities in diet, intestinal absorption, internal metabolism and excretion, this life-threatening complication has not been well documented.

Adult↗

An audit of cardiac arrest management by extended trained ambulance crew.

OBJECTIVE: To audit the use of extended skills by South Glamorgan Ambulance crew in attempted resuscitations from out-of-hospital cardio-respiratory arrest, in terms of successful discharge of patients from hospital and the accuracy with which agreed protocols were applied. Design-Retrospective analysis of ambulance report forms, electrocardiograph rhythm strips, casualty cards and discharge summaries during 26 months (1st May 1987-30th June 1989). SETTING: A mixed urban and semi-rural area of 187 square miles with a population of 396,000. RESULTS: There were 274 attempted resuscitations. Seven patients (2.5%) were managed for primary respiratory arrest and 3 were discharged. In 98 patients (35.8%) the initial resuscitation protocol was for ventricular fibrillation: 26 were admitted and 17 were discharged. In 169 patients (61.7%) the initial resuscitation protocol was for asystole or electromechanical dissociation: 11 were admitted and 1 discharged. The majority of patients who were successfully discharged from hospital were those in ventricular fibrillation who responded to defibrillation alone (13 survivors). Drug administration may have played a role in the successful resuscitation of the remainder. Endotracheal intubation was successful in 94.7% and vein cannulation in 87.7% of attempts. There were deviations from the ventricular fibrillation protocol in 27 cases (27.5%) and from the asystole protocol in 27 cases (16.0%). CONCLUSION: Survival rates for ventricular fibrillation managed by these personnel were satisfactory with early defibrillation. Defibrillation alone was responsible for the majority of successful resuscitations. The additional benefit of drug administration appears small, though potentially important. The majority of patients were in asystole by the time the ambulance arrived. IMPLICATIONS: Extended trained crews use their skills effectively. The most important skill is defibrillation. Further studies are required to explain the high proportion of patients found in asystole. The performance of individual ambulance personnel should be assessed prospectively, because agreed resuscitation protocols are not always followed.

Ambulances↗

Potential impact upon community mortality rates of training citizens in cardiopulmonary resuscitation.

In order to estimate the impact of a community programme of training in cardiopulmonary resuscitation (CPR), we reviewed all adult deaths in the city of Cardiff (population 292,600) during a 13-week period. Of 701 deaths, 70 were cases of fatal out-of-hospital cardiac arrest due to heart disease, for whom it was felt that CPR might have been of value. Only 34 (48.6%) deaths were witnessed, and in 22 of them the witness did not start CPR. In the majority of cases the ambulance service was not summoned immediately. We calculate that a community CPR training programme may, at best, reduce the community cardiac mortality rate by 7.5%, ie saving between 24 and 56 lives per 100,000 adult population per year; but more realistically, such a programme can only achieve a reduction of 0.4%, ie saving up to six lives per 100,000 per year. Although community CPR training programmes are likely to lead to only a modest reduction in community cardiac mortality rates, because countrywide there are many deaths, the total of lives saved would be significant. Implementation of such programmes should be carefully evaluated.

Adult↗