first-degree block

first-degree block

See Heart block.
References in periodicals archive ?
Of those children with conduction abnormalities born to mothers with Ro/La antibodies, most will have first-degree block.
In sinus tachycardia with first-degree block, the P wave may fall within the T wave and not be detected on surface ECG or be mistaken for a retrograde P wave.
The wire study can be used to exclude sinus tachycardia with first-degree block by careful comparison of RP and PR intervals during atrial and/or ventricular pacing (Figure 6).
The significance of first-degree block is not firmly established (see below).
A third case developed first-degree block at birth (32 weeks gestation) as demonstrated by ECG after normal PR intervals in utero; the block persists at age 3 years.
The patient had a history of first-degree block (in which signals are slowed but still reach the ventricles), which worsened to third-degree block due to bypass surgery performed two weeks prior to her implant.