Chronic liver disease-associated severe thrombocytopenia in Spain: Results from a retrospective study using machine learning and natural language processing

BACKGROUND

Patients with chronic liver disease (CLD) often develop thrombocytopenia (TCP) as a complication. Severe TCP (platelet count<50×109/L) can increase morbidity and complicate CLD management, increasing bleeding risk during invasive procedures.

OBJECTIVES

To describe the real-world scenario of CLD-associated severe TCP patients' clinical characteristics. To evaluate the association between invasive procedures, prophylactic treatments, and bleeding events in this group of patients. To describe their need of medical resource use in Spain.

METHODS

This is a retrospective, multicenter study including patients who had confirmed diagnosis of CLD and severe TCP in four hospitals within the Spanish National Healthcare Network from January 2014 to December 2018. We analyzed the free-text information from Electronic Health Records (EHRs) of patients using Natural Language Processing (NLP), machine learning techniques, and SNOMED-CT terminology. Demographics, comorbidities, analytical parameters and characteristics of CLD were extracted at baseline and need for invasive procedures, prophylactic treatments, bleeding events and medical resources used in the follow up period. Frequency tables were generated for categorical variables, whereas continuous variables were described in summary tables as mean (SD) and median (Q1-Q3).

RESULTS

Out of 1,765,675 patients, 1787 had CLD and severe TCP; 65.2% were male with a mean age of 54.7 years old. Cirrhosis was detected in 46% (n=820) of patients and 9.1% (n=163) had hepatocellular carcinoma. Invasive procedures were needed in 85.6% of patients during the follow up period. Patients undergoing procedures compared to those patients without invasive procedures presented higher rates of bleeding events (33% vs 8%, p<0.0001) and higher number of bleedings. While prophylactic platelet transfusions were given to 25.6% of patients undergoing procedures, TPO receptor agonist use was only detected in 3.1% of them. Most patients (60.9%) required at least one hospital admission during the follow up and 14.4% of admissions were due to bleeding events with a hospital length of stay of 6 (3, 9) days.

CONCLUSIONS

NLP and machine learning are useful tools to describe real-world data in patients with CLD and severe TCP in Spain. Bleeding events are frequent in those patients who need invasive procedures, even receiving platelet transfusions as a prophylactic treatment, increasing the further use of medical resources. Because that, new prophylactic treatments that are not yet generalized, are needed.

Epistaxis in the cirrhotic patient: A complication to be considered

INTRODUCTION

Epistaxis in cirrhotic patients is a common issue. However, the literature published to date is very scarce.

MATERIAL AND METHODS

Retrospective case series of patients with cirrhosis who presented with a significant epistaxis, between 2006 and 2016.

RESULTS

Data were collected from 39 cirrhotic patients with a mean age of 61.4 (±14) years, 75% of which were males. The main comorbidities were hypertension (33%) and diabetes mellitus (26%). Seven (18%) patients were taking antiplatelet drugs and 3 (8%) anticoagulants. One third of patients had a previous history of epistaxis and 6 had a previous ENT pathology. The main aetiological factor of cirrhosis was alcohol in 46% of cases, with 15 (38%) patients presenting with Child A, 12 (31%) Child B and 12 (31%) Child C class. The median MELD score upon admission was 16 [12-21]. Thirty-five (97%) patients had portal hypertension. At admission, the median platelet count was 89,000 [60,000-163,000] and mean INR was 1.52 (±0.37). Clinically, epistaxis presented as haematemesis or melaena in 8 (21%) patients, simulating gastrointestinal bleeding due to swallowing of blood. In 10 (26%) patients, epistaxis was considered as the probable trigger of an episode of hepatic encephalopathy. Two patients required ICU admission due to bleeding and 8 (21%) died during hospitalisation due to causes not directly related to epistaxis.

CONCLUSIONS

Epistaxis is a complication to be taken into account in cirrhotic patients, as it can act as an encephalopathy trigger or simulate an episode of gastrointestinal bleeding.