What Do You Understand by Sinus Rhythm Flashcards

Rhythm: Regular Rate: 60-100 bpm P Waves: Upright/Normal P-R Interval: .12-.20 QRS: .04-.12 Hemodynamic: optimal cardiac rhythm for adequate CO

Rhythm: Regular Rate: < 60 bpm P Waves: Upright/Normal P-R Interval: .12-.20 QRS: .04-.12 Hemodynamic: Many maintain adequate CO if able to compensate w/ healthy heart. Others may have a decrease in CO.

Rhythm: Regular Rate: > 100 and < 160 P Waves: Upright/Normal P-R Interval: .12-.20 QRS: .04-.12 Hemodynamic: decrease in ventricular filling time, less blood volume in the ventricle for next systole, lower CO, increased myocardial O2 consumption

Rhythm: Irregular Rate: 60-100 P Waves: Upright/Normal P-R Interval: .12-.20 QRS: .04-.12 Rate r/t inspiration & expiration Hemodynamic: tolerated well

Rhythm: Irregular Rate: normal-slow P Waves: Upright/Normal P-R interval: .12-.20 QRS: .04-.12 SA node fails to produce an impulse (skips a beat) Hemodynamic: depends on # of beats arrested or blocked and length of resulting pause; multiple could result in asystole

Rhythm: Slightly Irregular Rate: Normal-slow P Waves: Abnormal - absent P-R Interval: Varies - can be < or > .12-.20 QRS: .04-.12 pacing from a variety of different foci Hemodynamic: May result in less effective atrial depolarization, vent filling may be effected decreasing CO.

Rhythm: Irregular (PACs); Noncompensatory Rate: Depends on underlying rhythm P Waves: Upright/Normal P-R Interval: .12-.20 QRS: .04-.12 P wave shape will not be the same QRS happens earlier than should (distance will be less) Ventricular contractions earlier b/c distance impulse travels is less in atria Impulse in atria other than from SA node is strong enough to make ventricle contract Takes 1 impulse to get impulse to ventricle (1:1) Hemodynamic: Usually do not alter CO; may experience palpitation

Rhythm: Regular Rate: > 150-250 P Waves: Upright/Normal P-R Interval: .12-.20 QRS: .040.12 Rapid onset then goes away No stimulation that instigates this Hemodynamic: none to shock; faster the heart rate, the less time for ventricular filling which can compromise CO

Rhythm: Regular Rate: > 150-250 P Waves: Indiscernible P-R Interval: None seen QRS: .04-.12 Impulse coming from above the ventricles Not able to tell P waves or measure PR interval Hemodynamic: none to shock; faster the heart rate, the less time for ventricular filling which can compromise CO

Rhythm: Atrial-Regular; Vent-Varies Rate: Atrial: 250-300; Vent: Varies P Waves: Big F-waves - Saw Tooth Pattern P-R Interval: Normally constant - may vary QRS: .04-.12 Impulse comes from other than SA node All impulses are from same foci all F waves have same pattern can take 2 or more tries to get impulse to ventricle to contract (2:1, 3:1, etc) From a single irritable area Hemodynamic: Depends on ventricular rate - the faster the rate the higher the chance of decreasing CO. If HR is maintained at 60-100 by the AV nodes blocking impulses, CO can be normal

Rhythm: Irregularly irregular ventricular Rate: Atrial: 350-700; Vent: Varies P Waves: Little F waves - no pattern P-R interval: No discernible P waves QRS: .04-.12 Atria quiver before getting enough strength to force blood into ventricle. BIG concern: clotting - blood pools in atria; need anticoagulant therapy. Atria irritable - places competing around atria to send impulse till one gets thru & causes ventricle to contract Atrial kick has been lost P waves so fine cannot see them Continuous, rapid-firing of multiple foci in atria QRS might be slightly widened Hemodynamic: Atria are never fully depolarized and so don't contract, therefore lose atrial kick. Also r/t ventricular response time. Those with marked slower or faster rates are more likely to have decreased CO.

Rhythm: Regular Rate: 40-60 P waves: Inverted - prior to or after; absent P-R Interval: < .12 if present QRS: .04-.12 Impulse coming from b/t atria & ventricle - must fire backward to get atria to contract If see P wave the P-R interval will be shorter because impulse not traveling as far. Hemodynamic: Atrial depolarization (atrial kick) is usually less effective or absent, resulting in decreased ventricular filling & diminished CO.

Rhythm: Regular Rate: 60-100 P Waves: Inverted - prior to or after; absent P-R Interval: < .12 if present QRS: .04-.12 Hemodynamic: Similar to junctional rhythm however, ventricular filling may be further compromised by the faster heart rate. Conversely the acceleration of HR may improve CO if stroke volume is decreased.

Rhythm: Regular Rate: 100-180 PWaves: Inverted - prior to or after; absent P-R interval: < .12 if present QRS: .04-.12 Hemodynamic: Similar to junctional rhythm however, ventricular filling may be further compromised by the faster heart rate. Conversely the acceleration of HR may improve CO if stroke volume is decreased.

Rhythm: Regular; can be irregular Rate: Usually 60-100 P Waves: Upright/Normal P-R Interval: > .20; constant QRS: .04-.12 should see more than 5 squares between beginning of P and QRS Impulse taking a little longer to get to AV node P-R interval is prolonged the same amount every cycle Hemodynamic: do not usually occur