Covid-19 Associated Respiratory Failure

	Infra-Hisian Block Microchapters
Overview
Historical Perspective
Classification
Pathophysiology
Causes
Epidemiology and Demographics
Risk Factors
Natural History, Complications and Prognosis
Diagnosis
Treatment
Prevention
Differentiating Infra-Hisian Block from other Diseases

Overview

On 31 December 2019, the World Health Organization (WHO) was formally notified about a cluster of cases of pneumonia in Wuhan City.

**Classification of Waldenstrom macroglobulinemia (WM) and Related Disorders**
Criteria	Symptomatic WM	Asymptomatic WM	IgM-Related Disorders	MGUS
IgM monoclonal protein	+	+	+	+
Bone marrow infiltration	+	+	-	-
Symptoms attributable to IgM	+	-	+	-
Symptoms attributable to tumor infiltration	+	-	-	-

↑ Kiran U, Aggarwal S, Choudhary A, Uma B, Kapoor PM (2017). "The blalock and taussig shunt revisited". Ann Card Anaesth. 20 (3): 323–330. doi:10.4103/aca.ACA_80_17. PMC 5535574. PMID 28701598.
↑ Chaplin, Steve (2020). "COVID ‐19: a brief history and treatments in development". Prescriber. 31 (5): 23–28. doi:10.1002/psb.1843. ISSN 0959-6682. line feed character in |title= at position 6 (help)