Medical Pharmacology Chapter 6:  Autonomic Pharmacology: Cholinergic Drugs

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First Degree Heart Block

P Wave

PR Interval

QRS (sec.)

Characteristics

Before each QRS (identical)

> 0.20

< 0.12

Regular

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Second Degree AV Block (Mobitz Type I)

P Wave

PR Interval

QRS (sec.)

Characteristics

Conduction Intermittent

Increasingly Prolonged

< 0.12

QRS dropped in a repeating pattern

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Third Degree (Complete) Block

P Wave

PR Interval

QRS (sec.)

Characteristics

Normal but not related to QRS

none

N/A

No relationship between P & QRS complex

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Taylor, P. Agents Acting at the Neuromuscular Junction and Autonomic Ganglia In, Goodman and Gillman's The Pharmacologial Basis of Therapeutics,(Hardman, J.G, Limbird, L.E, Molinoff, P.B., Ruddon, R.W, and Gilman, A.G.,eds) The McGraw-Hill Companies, Inc.,1996, pp.193-195. Adapted from Table 9-3.

 

 

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