Killip class

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The Killip classification is a system used in individuals with an acute myocardial infarction (heart attack), in order to risk stratify them. Individuals with a low Killip class are less likely to die within the first 30 days after their myocardial infarction than individuals with a high Killip class.[1]

The study

The study was a case series with unblinded, unobjective outcomes, not adjusted for confounding factors, nor validated in an independent set of patients. The setting was the coronary care unit of a university hospital in the USA.

250 patients were included in the study (aged 28 to 94; mean 64, 72% male) with a myocardial infarction. Patients with a cardiac arrest prior to admission were excluded.

Patients were ranked by Killip class in the following way:

Conclusions

Within a 95% confidence interval the patient outcome was as follows:

  • Killip class I: 81/250 patients; 32% (27 to 38%). Mortality rate was found to be at 6%.
  • Killip class II: 96/250 patients; 38% (32 to 44%). Mortality rate was found to be at 17%.
  • Killip class III: 26/250 patients; 10% (6.6 to 14%). Mortality rate was found to be at 38%.
  • Killip class IV: 47/250 patients; 19% (14 to 24%). Mortality rate was found to be at 81%.

The Killip-Kimball classification has played a fundamental role in classic cardiology, having been used as a stratifying criteria for many other studies. Worsening Killip class has been found to be independently associated with increasing mortality in several studies.

Killip class 1 and no evidence of hypotension or bradycardia, in patients presenting with acute coronary syndrome, should be considered for immediate IV beta blocker therapy.

References

  1. Killip T, Kimball JT. Treatment of myocardial infarction in a coronary care unit: a two year experience of 250 patients. Am J Cardiol 1967; 20: 457-464. ISSN 0002-9149


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