acutebasiccardiaccareclassificationcompartmentconsiderationscovidcriticalendpointsfailurefracturesfundamentalsgrandhemodynamicallyinitialinjuryinsightsjeankenkidneylouismanagementmattoxmechanicalmodernmuchobstructionpandemicpathophysiologypatientspelvicrapidrespiratoryresuscitationrolescottseasonsequenceshocksurgerysyndrometalkuclaunstableventilationvincent