Rudi Bruyninckx

Signs and symptoms in diagnosing acute myocardial infarction and acute coronary syndrome: a diagnostic meta-analysis.

BACKGROUND Prompt diagnosis of acute myocardial infarction or acute coronary syndrome is very important. AIM A systematic review was conducted to determine the accuracy of 10 important signs and symptoms in selected and non-selected patients. DESIGN OF STUDY Diagnostic meta-analysis. METHOD Using MEDLINE, CINAHL, EMBASE, tracing references, and by contacting experts, studies were sought out that described one of the 10 signs and symptoms on one or both conditions. Studies were excluded if they were not based on original data. Validity was assessed using QUADAS and all data were pooled using a random effects model. RESULTS Sixteen of the 28 included studies were about patients who were non-selected. In this group, absence of chest-wall tenderness on palpation had a pooled sensitivity of 92% (95% confidence interval [CI] = 86 to 96) for acute myocardial infarction and 94% (95% CI = 91 to 96) for acute coronary syndrome. Oppressive pain followed with a pooled sensitivity of 60% (95% CI = 55 to 66) for acute myocardial infarction. Sweating had the highest pooled positive likelihood ratio (LR+), namely 2.92 (95% CI = 1.97 to 4.23) for acute myocardial infarction. The other pooled LR+ fluctuated between 1.05 and 1.49. Negative LRs (LR-) varied between 0.98 and 0.23. Absence of chest-wall tenderness on palpation had a LR- of 0.23 (95% CI = 0.18 to 0.29). CONCLUSIONS Based on this meta-analysis it was not possible to define an important role for signs and symptoms in the diagnosis of acute myocardial infarction or acute coronary syndrome. Only chest-wall tenderness on palpation largely ruled out acute myocardial infarction or acute coronary syndrome in low-prevalence settings.

Chest pain in the emergency department: the broad spectrum of causes.

We performed a prospective study to describe the broad spectrum of causes of chest pain in patients presenting to the emergency department and to compare the diagnoses in referred patients, self-referred patients and patients rushed in by ambulance. The final diagnosis in a consecutive case series of 578 chest pain patients was established after discharge from the hospital. The underlying disorders were grouped into cardiac, respiratory, gastro-oesophageal disorders, musculoskeletal pathology, somatization disorders, other diseases and unknown. For comparison of the frequencies of the disease categories the Chi-squared test was used. Out of 578 patients, 161 (27.9%) were self-referred, 369 (63.8%) were referred by the general practitioner and 48 (8.3%) were rushed in by ambulance. Cardiac diseases represented 51.7% of the cases, myocardial infarction and unstable angina 19% and 12.8% respectively. Cardiac diseases were statistically significantly less common in self-referred patients (p <0.0005). Pulmonary diseases encompassed 14.2% of the population, followed by somatization disorders (9.2%), musculoskeletal pathology (7.1%) and other causes (4.3%). In 11.1% of the cases no definite final diagnosis could be established. Somatization disorders were significantly more frequent in self-referred and ambulance patients. Cardiac and pulmonary problems are the most frequent underlying disorders in acute chest pain patients in the emergency department. Somatization disorders and musculoskeletal pathology represented respectively 19.1% and 14.8% of the non-cardiac causes. The referral pattern influenced significantly the distribution of the disease categories with more cardiac and less psychiatric disorders in referred patients.

Why does the general practitioner refer patients with chest pain not-urgently to the specialist or urgently to the emergency department? Influence of the certainty of the initial diagnosis.

Background — Chest pain is an initial symptom for several minor diseases but acute myocardial infarction (AMI) should not be missed. Aim — To assess the influence of initial diagnosis and degree of certainty of this initial diagnosis on the referral decision and the referral method (urgent – non-urgent) in patients contacting their GP with chest pain. Study design — Observational study. Setting — The study was performed in a sentinel network of general practices in Belgium, covering almost 1.6% of the population. Subjects — All patients attending their GP and complaining of chest pain during 2003. Method — The relationships were reported as proportions and in odds ratios (OR) with their 95% confidence intervals. Results — 1996 patients were included (men 52%). Men were referred more often (OR = 1.44; 95% CI: 1.13-1.82). Age shows no relation to referral (OR = 1.06; 95% CI: 0.83-1.35) but predicts urgent referral (OR = 1.46; 95% CI: 1.02-2.08). Odds ratios in case of serious heart disease were high with 11.58 (95% CI: 5.72-23.44) when the GP was certain of his diagnosis and 2.96 (95% CI: 1.59-5.51) if not. If the GP was uncertain, in all disease categories 54% (95% CI: 48-59) of the patients were referred non-urgently. Conclusion — Referral rates for patients with chest pain were influenced by the initial diagnosis and the degree of certainty of this initial diagnosis.

Half of the patients with chest pain that are urgently referred are transported in unsafe conditions.

Background Patients with an acute coronary syndrome should be referred to hospital urgently to start reperfusion therapy as soon as possible. Owing to the risks of ventricular fibrillation and pulseless ventricular tachycardia, urgent transport should be organized under safe conditions, that is, with a defibrillator at hand. Aim To evaluate the type of transport of patients with chest pain referred by their general practitioner (GP). Design of study Observational study. Setting A sentinel network of general practices in Belgium, covering almost 1.6% of the total population. Patients One thousand nine hundred and ninety-six patients with chest pain attending their GP in 2003. Method Descriptive analyses reporting proportions along with their 95% confidence interval (CI). Results Male patients were referred to hospital more often than female patients: 44.9% (95% CI: 41.6–47.8) versus 36.5% (95% CI: 33.4–39.6). For patients who were referred routinely, 92.7% (95% CI: 89.1–95.2) were transported by family and neighbours, 4.8% (95% CI: 2.8–7.9) by ambulance and 2.5% (95% CI: 1.2–5.1) by GPs. For patients who were referred urgently, ambulances transported 56.9% (95% CI: 51.1–62.7), family and neighbours 36.9% (95% CI: 31.4–42.7) and the GP 6.1% (95% CI: 3.7–9.5). Conclusion Almost half of the patients with chest pain who require urgent referral are transported in unsafe conditions.

Studies on the use of BD Vacutainer® SST II™ and RST™ in general practice: investigation of artefactual hyperkalaemia

Background Current sampling and transport conditions of samples in general practice can result in pseudohyperkalaemia. This study was undertaken to determine, in a general practice setting, whether there is any difference in haemolysis obtained when using BD Vacutainer® Rapid Serum Tubes (BD RST) compared with using BD Vacutainer® SST™ II Advance Blood Collection Tubes (BD SSTII). Methods Blood was collected from 353 patients requiring blood sampling who were attending 31 general practitioner practices in Belgium. For each patient, two BD SSTII tubes and two BD RST tubes were drawn in a randomized order. One of each pair of tubes was inverted five times, the other was not. Serum potassium concentration, serum LDH activity and haemolysis index were measured in each sample. Results There was no significant difference in measured potassium concentration according to tube type (P = 0.16). Measured LDH activities were 1.7% higher in serum collected into BD SSTII tubes compared to BD RST tubes (P = 0.02). When comparing serum from unmixed BD RST with BD SSTII tubes, there was a slight reduction in the haemolysis index but no significant difference in measured potassium concentration or LDH activity. Risk of hyperkalaemia was 4.8 times higher in serum from tubes that were incompletely filled compared to those that were filled with the correct amount of blood. Conclusion Both types of blood tubes are suitable for the measurement of serum potassium and LDH in patients from general practice. Tube inversion does not improve the accuracy of either serum potassium or LDH measurement. Blood tubes should be filled to the level recommended by the manufacturer to avoid artefactual increases in measured serum potassium concentration and LDH activity.

Excess of mortality in patients with chest pain peaks in the first 3 days period after the incident and normalizes after 1 month

Background. Patients presenting with chest pain have a 5% chance of experiencing a coronary event. These patients are at risk of mortality and should be recognized and referred to secondary care. Aim. To determine the relationship between referral type and mortality in patients with chest pain. Methods. The design of the study is an observational study. The setting of the study is a sentinel network of general practices in Belgium, covering 1.6% of the total population. The subjects are 1558 consecutive patients consulting with chest pain in 2003. Descriptive analyses report the standardized mortality ratios. We used the Belgian population of 1999 as the reference population and as the standard population. Results. The standardized mortality ratios of 3 days were 151.0 [95% confidence interval (CI): 82.3–250.3] for the urgent referred group, 45.5 (95% CI: 12.4–116.0) for non-urgent and 13.6 (95% CI: 1.7–49.4) for the non-referred group. The standardized ratios of 1 month were, respectively, 27.6 (95% CI: 18.0–40.4), 6.7 (95% CI: 2.5–14.6) and 4.7 (95% CI: 1.9–9.7). The standardized ratios of 2–12 months were normal for the urgent referral group (1.3; 95% CI: 0.7–2.2) and for the non-urgent referral group (1.0; 95% CI: 0.5–1.9) and even less in the non-referred group (0.4; 95% CI: 0.2–0.9). Conclusions. Mortality in the first 3 days and first month after consulting for chest pain is very high. There is a marked trend in mortality according to the referral type—urgently referred, non-urgently referred and not referred—suggesting risk stratification by the GP. After 1 month, mortality normalizes for all groups, suggesting that the surviving patients are well treated and the condition causing the chest pain no longer influences survival compared to the general population.