**Question:** High resolution manometry is investigation of choice in all except which of the following?

A. Abdominal pain
B. Abnormal liver function tests
C. Acute myocardial infarction
D. Acute stroke

**Core Concept:** High-resolution manometry (HRM) is a non-invasive diagnostic test used to assess the motility and function of the gastrointestinal (GI) tract, particularly for diagnosing motility disorders. It involves the placement of multiple pressure sensors along the GI tract to record pressure waves and identify patterns specific to various GI regions.

**Why the Correct Answer is Right:** High-resolution manometry is primarily used to diagnose motility disorders in the esophagus, stomach, and small intestine. It helps in assessing the coordination of peristalsis and the presence of achalasia, a condition characterized by impaired lower esophageal sphincter relaxation. However, it is not the first choice of investigation for conditions that require rapid assessment of cardiac or neurological function as in cases of abdominal pain, abnormal liver function tests, acute myocardial infarction, and acute stroke.

**Why Each Wrong Option is Incorrect:**

A. **Abdominal pain:** High-resolution manometry is not the optimal test to evaluate abdominal pain, as it does not assess visceral sensory pathways and visceral pain transmission. Investigations like abdominal ultrasound, computed tomography (CT) scan, or electrocardiogram (ECG) are more suitable for evaluating abdominal pain.

B. **Abnormal liver function tests:** High-resolution manometry is not relevant for assessing liver function, which is evaluated through liver function tests (LFTs) like serum bilirubin, alanine transaminase (ALT), aspartate transaminase (AST), alkaline phosphatase, and gamma-glutamyl transaminase (GGT). These tests are used to diagnose liver disease and monitor its progression.

C. **Acute myocardial infarction (AMI):** High-resolution manometry is not suitable for assessing cardiac function in acute situations like AMI. Diagnostic tests like cardiac enzymes (troponin), electrocardiogram (ECG), and echocardiography are more appropriate for diagnosing AMI and evaluating cardiac function.

D. **Acute stroke:** High-resolution manometry does not evaluate neurological functions and is not a suitable tool for diagnosing stroke or assessing neurological deficits. Neuroimaging tests like computed tomography (CT) scan, magnetic resonance imaging (MRI), or neurological examination are more appropriate for diagnosing stroke and evaluating neurological function.

**Clinical Pearls:**

1. **Acute myocardial infarction (AMI) and stroke:** These conditions require rapid assessment of cardiac function and neurological deficits, respectively. Diagnostic tests like cardiac enzymes, electrocardiogram, and echocardiography for AMI, or CT scan, MRI, or neurological examination for stroke, are more suitable for evaluating the indicated conditions.

2. **High-resolution manometry in gastrointestinal pain:** While high-resolution manometry is valuable in evaluating motility disorders, it is not the first-line test for investigating acute abdominal pain, chest pain, or other gastrointestinal symptoms. Diagnostic tests like ultrasound, computed