Alternative Blood Pressure Measurements in OB Patients

Summary

The incidence of obesity has been increasing worldwide. In women with obesity, the anthropometric differences in the distribution of subcutaneous tissue can make accurate measurement of blood pressure difficult. A large upper arm circumference can prevent the use of a brachial artery blood pressure cuff and often prompts the use of alternative methods for blood pressure measurement, including measurements on the wrist or forearm. Outside of the obstetric population, there is evidence that if measurement of the blood pressure at the upper arm is not possible then measurement at the wrist can be used. Despite this evidence in non-pregnant patients, there is limited evidence in pregnancy regarding the accuracy of blood pressure measurements on the forearm or wrist. Accurate measurement of blood pressure is especially important in pregnancy to allow for prompt treatment of severe hypertension and for accurate diagnosis of hypertensive disorders of pregnancy. Error in measurement could lead to iatrogenic preterm birth or under treatment of severe hypertension, both which can lead to severe maternal and fetal morbidity and mortality. Additionally, it is biologically plausible that an increase in subcutaneous edema and vascular changes in pregnancy could lead to a larger discrepancy in blood pressure measurements between upper arm, forearm and wrist measurements.

Due to the increasing epidemic of obesity and the increasing need for accurate alternative blood pressure measurements the investigators propose a prospective observational study of pregnant women ≥18 years old admitted to labor and delivery for any indication or seen for prenatal care in OBGYN clinic. A total of 20 women in each BMI class (normal, overweight (25-29.9), class 1 (30-34.9), class 2 (35-39.9), class 3 (\>40) will be enrolled (100 total). Participation will include a total of 9 blood pressure measurements, biometric measurements on the patient's upper arm, forearm, and wrist and a brief questionnaire. The investigators hypothesize that there will be a discrepancy between blood pressure measurements on the upper arm and forearm or wrist.

Conditions

• Obesity
• Blood Pressure

Interventions

DIAGNOSTIC_TEST

Blood pressure measurement

Study subjects will have a total of 9 blood pressure measurements taken (3 on upper arm, 3 on lower arm, and 3 on wrist)

Sponsors & Collaborators

• Albany Medical College

  lead OTHER

Principal Investigators

• Tara Lynch, MD · Albany Medical College

Study Design

Allocation

NON_RANDOMIZED

Purpose

DIAGNOSTIC

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

18 Years

Max Age

89 Years

Sex

FEMALE

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2020-03-01

Primary Completion

2021-07-01

Completion

2021-07-01

Countries

• United States

Study Locations