cardiovascular disease: arteriosclerotic heart disease, hypertension, congestive heart failure (CHF), and varicosities -- blood dyscrasias: anemia, thrombus, and transfu-sion reactions -- hypotension: arising from anaphylactic shock, hypovolemia, hypoglycemia, hyperglycemia, and orthostatic hypotension -- medication side effects: antihypertensives, vasodilators, diuretics, and antipsychotics -- other conditions: edema, inflammation, prolonged immobility, hypothermia, and malnutrition