Mark the incorrect statement w.r.t ECG

Options

A. It is recorded with the help of electrocardiograph
B. While recording a standard ECG, Einthoven's triangle is created by placing electrical leads on both wrists and on left angle
C. T-wave represents the and of joint diastole
D. By counting the number of QRS complexes one can determine the heart rate of an individual

Answer

To solve the question "Mark the incorrect statement w.r.t ECG," we will analyze each statement provided and determine which one is incorrect.

### Step 1: Understand the purpose of an ECG
An electrocardiogram (ECG) is a test that records the electrical activity of the heart over a period of time. It is used to detect heart problems and monitor the heart's health.

**Hint:** Remember that an ECG is a diagnostic tool for heart activity.

### Step 2: Analyze the first statement
The first statement mentions that an ECG is recorded with the help of an electrocardiograph. This is correct, as an electrocardiograph is the device used to create an ECG.

**Hint:** Identify the equipment used in ECG recording.

### Step 3: Analyze the second statement
The second statement refers to the placement of leads to create Einthoven's triangle. It states that leads are placed on both wrists and on the left ankle. This is also correct, as Einthoven's triangle is formed using these lead placements.

**Hint:** Recall the lead placements for Einthoven's triangle.

### Step 4: Analyze the third statement
The third statement discusses the T wave, stating that it represents the end of joint diastole. This is incorrect. The T wave actually represents the end of ventricular systole (the relaxation phase of the ventricles), not joint diastole.

**Hint:** Know what each wave in the ECG represents, especially the T wave.

### Step 5: Analyze the fourth statement
The fourth statement mentions that by counting the number of QRS complexes, one can determine the heart rate of an individual. This is true, as the QRS complex corresponds to the ventricular contraction, and counting these can help calculate the heart rate.

**Hint:** Understand how heart rate is calculated using QRS complexes.

### Conclusion
After analyzing all the statements, the incorrect statement is the one regarding the T wave, which incorrectly states that it represents the end of joint diastole. The correct answer is that the T wave represents the end of ventricular systole.

**Final Answer:** The incorrect statement is the one about the T wave representing the end of joint diastole.