Introduction:
Community acquired pneumonia (CAP) is life threatening condition that require immediate management that differ from mild to sever which needs intensive care unit admission.
CAP had different etiological causes which include bacterial, viral, and fungal. Each etiological cause indicates specific management as early as possible to avoid pulmonary or extrapulmonary complications.
Several scoring systems are used to assess the severity of pneumonia using chest radiographs and laboratory investigations.
Electrical cardiometry is a noninvasive technique that can be used to detect intrathoracic changes or impedance by using thoracic fluid content (TFC )as a parameter.
TFCis a parameter that represents the whole (extravascular, intravascular, and intrapleural) fluid component within the thorax.

Aim of the work:
The aim of this work was to assess the role of electrical cardiometry as an indicator of mechanical ventilation in patients presenting with community
acquired pneumonia.

Patients and Methods:
The study included 45 adult patients of both sexes with severe community acquired pneumonia admitted to Critical Care Medicine Department in Alexandria University Hospitals and were not on mechanical ventilation at the beginning of the study. The patients were followed up till need of mechanical ventilationor discharge from ICU.
Patients younger than 18 years, with pleural effusion, pneumothorax, decompensated liver failure, decompensated heart failure, on renal replacement therapy and pregnant female are excluded from the study.