<prompt> Most important investigation for pericardial effusion is-Cardiac catheterizationUSGEchocardiographyX ray chest  <response>: Ans. is c i.e., Echocardiography o 2 D-echo is the investigation of choice for pericardial effusion.Investigationso Investiation of choice to identify individual cardiac chamber enlargement - 2D echocardiography.o Investigation of choice for pericardial effusion -2D-echocardiography.o Investigation of choice for valvular heart disease - 2D-echocardiography.o Investigation of choice for cardiomyopathy - 2D-echocardiograpby.o Investigation of choice for cardiac temponade - 2D-echocardiography.o Investigation of choice for aortic dissection in stable patient - MRI.o Investigation of choice for aortic dissection in unstable patient TEE.o Investigation of choice for ventricular function and size - Echocardiographyo Investigation of choice for congenital heart disease - Echocardiography,o Investigation of choice for pericardial defect - MRI.o Investigation of choice for radiotherapychemotherapy induced myocardial damage Endomyocardial biopsyo Investigation of choice for myocardial perfusion and viability reversible ischemial -- PET Nuclear cardiac imaging thallium scan or Technetium scan.o Investigation of choice for asymptomatic carotid bruit - Duplex ultrasound B-mode scan and doppler ultrasound velocitometry.o Most sensitive investigation for air embolism - Trans-esophageal echocardiography.o Second most sensitive investigation for air embolism - Precordial Doppler.o Best x-ray view for right atrial enlargement - Left anterior oblique view.o Best x-ray view for left atrial enlargement - Right anterior oblique view with barium swallow. 