AKI	Acute Kidney Injury
COPD	Chronic Obstructive Pulmonary Disease
COPDe	COPD Exacerbation
NIS	National Inpatient Sample
HCUP	Healthcare Cost and Utilization Project
LOS	Length of Stay
HTN	Hypertension
DLD	Dyslipidemia
DM	Diabetes Mellitus
CKD3–4	Chronic Kidney Disease Stage 3 to 4
CAD	Coronary Artery Disease
OSA	Obstructive Sleep Apnea
CVD	Cerebrovascular Disease
GERD	Gastroesophageal Reflux Disease
Pulm HTN	Pulmonary Hypertension
OR	Odds Ratio
CI	Confidence Interval
ESKD	End-Stage Kidney Disease
RRT	Renal Replacement Therapy
UTI	Urinary Tract Infection
KDIGO	Kidney Disease Improving Global Outcomes