• Normally people can walk a distance of 400-700 meters in 6 minutes.
  • A 6-minute walking distance of less than 300 meter is a simple and useful predictor of sudden cardiac death in a patient with mild to moderate heart failure.
  • Patients with interstitial lung disease who can cover less than 200 meters during 6-minute walk test are 4 times more likely to die than those who can walk greater distance.
  • People who can cover a distance of 200-300 meters need further evaluation.
  • A fall of SpO2 of more than 4% ending below 93% suggests significant desaturation.
  • An improvement of more than 70 meters or 10% in distance walked can make all the difference.
  • An improvement of 30 meters in any distance walked is the minimally important difference in any treatment.
  • Sudden cardiac death is linked to 15% of total urban mortality.
  • Risk factors for sudden cardiac death include abnormal lipid level, high blood pressure, cigarette smoking, physical inactivity, diabetic, obesity and family history of premature heart disease or heart attack.
  • Binge alcoholism can cause sudden cardiac death (6 or more drinks per day or five drinks in one session)
  • Risk of sudden cardiac arrest is transiently increased for up to 30 minutes after strenuous exercise (1/1.5 million of episode of exercise)
  • If you are at low risk for having a heart problem, you do not need a regular treadmill test.