Comparison of the Prevalence of First-Degree: RESULTS

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Figure and Table 1 demonstrate the gradual rising prevalence of first-degree AV block with advancing age in both ethnic groups. In the study group (Table 1), 6.9% (n=64 of 922) African-American patients had first-degree AV block, compared with 7.0% (n=84 of 1,201) Caucasian patients. For African-American patients, there is a gradual rise in the prevalence of first-degree AV block beginning at age 50 years and peaking in the 10th decade of life at 23.3% (n=10 of 43) patients. For Caucasian patients there is a gradual rise in the prevalence of first-degree AV block beginning at age 50 years with peaking in the ninth decade of life at 14.6% (n=26 of 178) patients, followed by a decline in the 10th decade of life to 12.2% (n=22 of 181) patients. First-degree AV block is more prevalent in African-American patients compared with Caucasian patients in all age groups of the study except for those patients in the eighth decade of life.

Table 1. Prevalence of First-Degree Atrioventricular Block by Age and Race in an Urban Hospital

Age Groups (Years)	20-2?	30-39	4(M9	50-59	60-69	70-79	80-89	90-99    Totals
Number of patients in age group	223	217	296	296	284	295	288	224      2123
Race: Caucasian/ African-American	117/106	104/113	129/167	153/143	167/117	172/123	178/110	181/43 1,201/922
Number of patients with first-degree atrioventricular block	1/3	1/4	1/4	7/10	12/10	14/6	26/17	22/10    84/64
Percent	0.9/2.8	1.0/3.5	0.8/2.4	4.6/7.0	7.2/8.5	8.1/4.9	14.6/15.5	12.2/23.3 7.0/6.9

Gender and Racial Prevalences of First-Degree AV Block

First-degree AV block occurred in 7.6% (n=72 of 950) male patients in the study, in 7.1% (n=27 of 380) African-American male patients, and in 7.9% (n=45 of 570) Caucasian male patients. First-degree AV block occurred in 6.5% (n=76 of 1,173) female patients in the study group, in 6.8% (n=37 of 542) African-American female patients; and in 6.2% (n=39 of 631) Caucasian female patients. prescription drugs online canada

The Placement of Electronic Pacemakers

In the study group, 47 patients received electronic pacemakers. For African Americans 1.3% (n=12 of 922) patients received electronic pacemakers. Placement of the pacemakers occurred primarily between ages 80-89 years when six of the 12 pacemakers were placed. For Caucasians, 2.9% (n=35 of 1,201) patients received electronic pacemakers. Placement occurred primarily between ages 80-99 years when 27 of the 35 pacemakers were placed.

Figure 1. Prevalence of Atrioventricular Block by Age and Race
The prevalence of first-degree AV block at various ages in African-American and Caucasian patients. The prevalence of first-degree AV block in African-American patients gradually increases from age 50 through 99 years to a level of 23.3% in the 10th decade of life. For Caucasian patients, the prevalence of first-degree AV block gradually increases from age 50 through 89 years to a level of 14.6% in the ninth decade of life, followed by a decline to 12.2% in the 10th decade of life. First-degree AV block is more prevalent in African-American compared with Caucasian patients at all age groups except in the eighth decade of life. suhagra 100