A Review Of Computed Tomography Pulmonary Angiograms In Three Teaching Hospitals: The Rise Of Sub-Segmental Pulmonary Emboli and Their Management
Notice bibliographique
Résumé
Abstract Background The availability of Computed Tomography Pulmonary Angiography (CTPA) has led to an increase in the number of investigations for Pulmonary Embolism (PE). With more widespread use of these high resolution scans, the frequency of identification of isolated Small Sub-segmental Emboli (SSPE) is also expected to increase. Current clinical practice guidelines do not make any treatment distinctions for SSPE, though the benefits of anticoagulation for SSPE have not been established. Aims To review the frequency of Pulmonary Embolism and Sub-segmental Pulmonary Embolism identified through CTPA as well as their management Methods Retrospective review of 2213 patient charts who underwent CTPA in three Hamilton teaching hospitals from 2009-2011. In depth chart review of patients with SSPE was undertaken to determine the frequency with which patients who received anticoagulation therapy for SSPE. The frequency of bleeding complications and recurrent thrombosis were also investigated in this detailed SSPE chart review. Results Our patient population (mean age 65) consisted of 1099 medical inpatients (50%), 702 surgical inpatients (32%) and 412 (18%) emergency department patients. PE was identified in 26 % of scans (n=576). Of these, SSPEs were the only identified thrombus in 82 patients (4% of total scans and 14% of identified PEs). In 55 of these 82 SSPEs, in addition to the SSPE, an alternative diagnosis that might explain the PE symptoms was found. Fifty-two percent (n=43) of the patients with an SSPE received therapeutic anticoagulation. In these life threatening bleeding occurred in 2 patients. There was no documented recurrent thrombosis or thrombosis-related deaths in three month follow-up among the 39 patients who did not receive anti-coagulation for SSPE. Of the 1,608 CTPAs that did not identify PE, an alternative diagnosis to account for the patient’s symptoms was identified on CT in 1078 (67%) and no alternative cause was found in 531 (33%). Summary/Conclusions Our study demonstrated a much lower frequency of pulmonary embolism in comparison to approximate 50 % pre-test probability of a positive scan seen in studies which validated CTPA for the diagnosis of PE. Isolated SSPEs accounted for 14% of all PEs found in our study population – and were present in 4% of all patients undergoing CTPA. A substantial proportion of patients were anti-coagulated SSPE (52%) and two developed life-threatening bleeding complications. No recurrent VTE was documented in patients who were not anticoagulated for PE, though follow-up was limited to hospital records. Randomized controlled trial data is needed to further investigate the risks and benefits of anticoagulation in patients with SSPE. Disclosures: No relevant conflicts of interest to declare.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,005 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,003 | 0,004 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».