The cardiovascular effects of large hiatal hernias: a narrative review of cases and studies.

Hiatal hernia (HH) is a common disease in the general population. It is often asymptomatic, but if it does present clinical manifestations, these are usually gastrointestinal. Gastroesophageal reflux is the main symptom that accompanies it.

Associated factors with the occurrence of in-hospital cardiac arrest in patients admitted to internal medicine wards for non-cardiovascular causes.

Background And Objective: In-hospital cardiac arrest (IHCA) has a low survival rate, so it is essential to recognize the cases with the highest probability of developing it. The aim of this study is to identify factors associated with the occurrence of IHCA.

Material And Methods: A single-center case-control study was conducted including 65 patients admitted to internal medicine wards for non-cardiovascular causes who experienced IHCA, matched with 210 admitted controls who did not present with IHCA.

Uneven vectorial projection is the best explanation for QRS dispersion, not the asynchronic ventricular activation.

Background: It is believed that QRS dispersion (QRSd) is caused by asynchrony of ventricular activation, but there are no studies that prove it.

Objectives: To determine the mechanism that best explains QRSd in surface electrocardiogram (ECG).

Methods: Cross-sectional study in 95 consecutive patients (median age: 31.

New Parameter of the Second Half of the P-Wave, P-Wave Duration, and Atrial Conduction Times Predict Atrial Fibrillation during Electrophysiological Studies.

Objective: Several P-wave parameters reflect atrial conduction characteristics and have been used to predict atrial fibrillation (AF). The aim of this study was to determine the relationship between maximum P-wave duration (PMax) and new P-wave parameters, with atrial conduction times (CT), and to assess their predictive value of AF during electrophysiological studies (AF-EPS).

Subjects And Methods: This was a cross-sectional study in 153 randomly selected patients aged 18-70 years, undergoing EPS.

Vectorial theory surpasses the local theory in explaining the origin of P-wave dispersion.

Background: Local theory and the vectorial theory are used to explain the origin of P-wave dispersion (PWD). There are no previous studies that analyze both at the same time.

Objectives: We set out to determine the implication of local and vectorial theories in the origin of PWD.

Atrial conduction explains the occurrence of the P-wave dispersion phenomenon, but weakly.

Background: P-wave dispersion (PWD) is believed to be caused by inhomogeneous atrial conduction. This statement, however, is based on limited little solid evidence. The aim of this study was to determine the relationship between atrial conduction and PWD by means of invasive electrophysiological studies.